Replace Bukkit Vector with new Vector impl

Prevents having to modify build.gradle.kts when disabling relocating.

build.gradle.kts

@@ -26,13 +26,9 @@ spotless {
 }
 
 group = "ac.grim.grimac"
-version = "2.3.68"
+version = "2.3.69"
 description = "Libre simulation anticheat designed for 1.21 with 1.8-1.21 support, powered by PacketEvents 2.0."
 
-java {
-    toolchain.languageVersion.set(JavaLanguageVersion.of(17))
-}
-
 // Set to false for debug builds
 // You cannot live reload classes if the jar relocates dependencies
 // Checks Project properties -> environment variable -> defaults true
@@ -63,7 +59,7 @@ dependencies {
     implementation("com.github.retrooper:packetevents-spigot:2.6.1-SNAPSHOT")
     implementation("co.aikar:acf-paper:0.5.1-SNAPSHOT")
     implementation("club.minnced:discord-webhooks:0.8.0") // Newer versions include kotlin-stdlib, which leads to incompatibility with plugins that use Kotlin
-    implementation("it.unimi.dsi:fastutil:8.5.13")
+    implementation("it.unimi.dsi:fastutil:8.5.15")
     implementation("github.scarsz:configuralize:1.4.0")
 
     //implementation("com.github.grimanticheat:grimapi:1193c4fa41")
@@ -71,9 +67,9 @@ dependencies {
     implementation("com.github.grimanticheat:grimapi:fc5634e444")
 
     implementation("org.jetbrains:annotations:24.1.0")
-    compileOnly("org.geysermc.floodgate:api:2.0-SNAPSHOT")
+    compileOnly("org.geysermc.floodgate:api:2.2.3-SNAPSHOT")
     compileOnly("org.spigotmc:spigot-api:1.18.2-R0.1-SNAPSHOT")
-    compileOnly("com.viaversion:viaversion-api:5.0.4-SNAPSHOT")
+    compileOnly("com.viaversion:viaversion-api:5.1.1-SNAPSHOT")
     //
     compileOnly("io.netty:netty-all:4.1.85.Final")
 }
@@ -159,6 +155,43 @@ publishing.publications.create<MavenPublication>("maven") {
     artifact(tasks["shadowJar"])
 }
 
+java {
+    sourceSets {
+        create("java18") {
+            java {
+                srcDirs("src/main/java18")
+            }
+            compileClasspath += main.get().output
+            runtimeClasspath += main.get().output
+        }
+    }
+    sourceCompatibility = JavaVersion.VERSION_1_8
+    targetCompatibility = JavaVersion.VERSION_1_8
+
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(21))
+    }
+}
+
+tasks.withType<JavaCompile> {
+    if (name == "compileJava18Java") {
+        options.compilerArgs.addAll(listOf("--add-modules", "jdk.incubator.vector", "-Xlint:unchecked"))
+        sourceCompatibility = "18"
+        targetCompatibility = "18"
+    }
+}
+
+tasks.withType<Jar> {
+    manifest {
+        attributes("Multi-Release" to "true")
+    }
+    duplicatesStrategy = DuplicatesStrategy.INCLUDE // Important for multi-release JARs
+    from(sourceSets.main.get().output)
+    from(sourceSets.getByName("java18").output) {
+        into("META-INF/versions/18")
+    }
+}
+
 tasks.shadowJar {
     minimize()
     archiveFileName.set("${project.name}-${project.version}.jar")

src/java18/java/ac/grim/grimac/utils/vector/SIMDVector3D.java

@@ -0,0 +1,149 @@
+package ac.grim.grimac.utils.vector;
+
+import jdk.incubator.vector.*;
+
+public final class SIMDVector3D implements Vector3D {
+
+    private static final VectorSpecies<Double> SPECIES = DoubleVector.SPECIES_PREFERRED;
+    private static final VectorMask<Double> LENGTH_3_ARRAY_MASK = SPECIES.indexInRange(0, 3);
+    private static final VectorShuffle<Double> CROSS_PRODUCT_SHUFFLE1 = VectorShuffle.fromArray(SPECIES, new int[]{1, 2, 0, 3}, 0);
+    private static final VectorShuffle<Double> CROSS_PRODUCT_SHUFFLE2 = VectorShuffle.fromArray(SPECIES, new int[]{2, 0, 1, 3}, 0);
+    private static final DoubleVector FOURTH_COMPONENT_ZERO = DoubleVector.zero(SPECIES).withLane(3, 1.0);
+
+    private DoubleVector vector;
+
+    public SIMDVector3D(double x, double y, double z) {
+        this.vector = DoubleVector.fromArray(SPECIES, new double[]{x, y, z, 0}, 0);
+    }
+
+    @Override
+    public double getX() {
+        return this.vector.lane(0);
+    }
+
+    @Override
+    public double getY() {
+        return this.vector.lane(1);
+    }
+
+    @Override
+    public double getZ() {
+        return this.vector.lane(2);
+    }
+
+    @Override
+    public Vector3D setX(double x) {
+        this.vector = this.vector.withLane(0, x);
+        return this;
+    }
+
+    @Override
+    public Vector3D setY(double y) {
+        this.vector = this.vector.withLane(1, y);
+        return this;
+    }
+
+    @Override
+    public Vector3D setZ(double z) {
+        this.vector = this.vector.withLane(2, z);
+        return this;
+    }
+
+    @Override
+    public double length() {
+        return Math.sqrt(lengthSquared());
+    }
+
+    @Override
+    public double lengthSquared() {
+        return this.vector.mul(this.vector).reduceLanes(VectorOperators.ADD);
+    }
+
+    @Override
+    public Vector3D multiply(double m) {
+        this.vector = this.vector.mul(m);
+        return this;
+    }
+
+    @Override
+    public Vector3D normalize() {
+//        DoubleVector squared = this.vector.mul(this.vector);
+//        double sum = squared.reduceLanes(VectorOperators.ADD);
+//        double length = Math.sqrt(sum);
+//        this.vector = this.vector.div(length);
+//        return this;
+        double length = length();
+        this.vector = this.vector.div(length).blend(FOURTH_COMPONENT_ZERO, LENGTH_3_ARRAY_MASK.not());
+        return this;
+    }
+
+    @Override
+    public Vector3D crossProduct(Vector3D other) {
+        SIMDVector3D o = (SIMDVector3D) other;
+
+        DoubleVector tmp0 = this.vector.rearrange(CROSS_PRODUCT_SHUFFLE1);
+        DoubleVector tmp1 = o.vector.rearrange(CROSS_PRODUCT_SHUFFLE2);
+
+        DoubleVector tmp2 = tmp0.mul(o.vector);
+        DoubleVector tmp3 = tmp0.mul(tmp1);
+
+        DoubleVector tmp4 = tmp2.rearrange(CROSS_PRODUCT_SHUFFLE1);
+
+        this.vector = tmp3.sub(tmp4).blend(FOURTH_COMPONENT_ZERO, LENGTH_3_ARRAY_MASK.not());
+        return this;
+    }
+
+    @Override
+    public Vector3D add(Vector3D o) {
+        this.vector = this.vector.add(((SIMDVector3D) o).vector);
+        return this;
+    }
+
+    @Override
+    public Vector3D subtract(Vector3D o) {
+        this.vector = this.vector.sub(((SIMDVector3D) o).vector);
+        return this;
+    }
+
+    @Override
+    public Vector3D multiply(Vector3D o) {
+        this.vector = this.vector.mul(((SIMDVector3D) o).vector);
+        return this;
+    }
+
+    @Override
+    public double distance(Vector3D o) {
+        return Math.sqrt(distanceSquared(o));
+    }
+
+    @Override
+    public double distanceSquared(Vector3D o) {
+        DoubleVector diff = this.vector.sub(((SIMDVector3D) o).vector);
+        return diff.mul(diff).reduceLanes(VectorOperators.ADD);
+    }
+
+    @Override
+    public double dot(Vector3D o) {
+        return this.vector.mul(((SIMDVector3D) o).vector).reduceLanes(VectorOperators.ADD);
+    }
+
+
+    @Override
+    public Vector3D clone() {
+        // I think this makes a shallow clone if I do it like this?
+//        try {
+//            return (Vector3D) super.clone();
+//        } catch (CloneNotSupportedException e) {
+//            throw new Error(e);
+//        }
+        try {
+            SIMDVector3D cloned = (SIMDVector3D) super.clone();
+            // Create a new DoubleVector with the same values
+            cloned.vector = DoubleVector.fromArray(SPECIES,
+                    new double[]{this.getX(), this.getY(), this.getZ(), 0}, 0);
+            return cloned;
+        } catch (CloneNotSupportedException e) {
+            throw new Error(e);
+        }
+    }
+}

src/java18/java/ac/grim/grimac/utils/vector/VectorOperationsJava18.java

@@ -0,0 +1,13 @@
+package ac.grim.grimac.utils.vector;
+
+import jdk.incubator.vector.VectorMask;
+import jdk.incubator.vector.VectorSpecies;
+import jdk.incubator.vector.DoubleVector;
+
+public class VectorOperationsJava18 implements VectorOperations {
+
+    @Override
+    public Vector3D newVector(double x, double y, double z) {
+        return new SIMDVector3D(x, y, z);
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/aim/processor/AimProcessor.java

@@ -59,15 +59,15 @@ public class AimProcessor extends Check implements RotationCheck {
 
         if (this.xRotMode.size() > SIGNIFICANT_SAMPLES_THRESHOLD) {
             Pair<Double, Integer> modeX = this.xRotMode.getMode();
-            if (modeX.second() > SIGNIFICANT_SAMPLES_THRESHOLD) {
-                this.modeX = modeX.first();
+            if (modeX.getSecond() > SIGNIFICANT_SAMPLES_THRESHOLD) {
+                this.modeX = modeX.getFirst();
                 this.sensitivityX = convertToSensitivity(this.modeX);
             }
         }
         if (this.yRotMode.size() > SIGNIFICANT_SAMPLES_THRESHOLD) {
             Pair<Double, Integer> modeY = this.yRotMode.getMode();
-            if (modeY.second() > SIGNIFICANT_SAMPLES_THRESHOLD) {
-                this.modeY = modeY.first();
+            if (modeY.getSecond() > SIGNIFICANT_SAMPLES_THRESHOLD) {
+                this.modeY = modeY.getFirst();
                 this.sensitivityY = convertToSensitivity(this.modeY);
             }
         }

src/main/java/ac/grim/grimac/checks/impl/badpackets/BadPacketsE.java

@@ -23,8 +23,7 @@ public class BadPacketsE extends Check implements PacketCheck {
             noReminderTicks = 0;
         } else if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType())) {
             noReminderTicks++;
-        } else if (event.getPacketType() == PacketType.Play.Client.STEER_VEHICLE ||
-                event.getPacketType() == PacketType.Play.Client.VEHICLE_MOVE) {
+        } else if (event.getPacketType() == PacketType.Play.Client.STEER_VEHICLE) {
             noReminderTicks = 0; // Exempt vehicles
         }
 

src/main/java/ac/grim/grimac/checks/impl/badpackets/BadPacketsO.java

@@ -39,7 +39,7 @@ public class BadPacketsO extends Check implements PacketCheck {
             boolean hasID = false;
 
             for (Pair<Long, Long> iterator : keepaliveMap) {
-                if (iterator.first() == id) {
+                if (iterator.getFirst() == id) {
                     hasID = true;
                     break;
                 }
@@ -55,7 +55,7 @@ public class BadPacketsO extends Check implements PacketCheck {
                 do {
                     data = keepaliveMap.poll();
                     if (data == null) break;
-                } while (data.first() != id);
+                } while (data.getFirst() != id);
             }
         }
     }

src/main/java/ac/grim/grimac/checks/impl/badpackets/BadPacketsR.java

@@ -41,9 +41,7 @@ public class BadPacketsR extends Check implements PacketCheck {
         if ((event.getPacketType() == PacketType.Play.Client.PLAYER_POSITION_AND_ROTATION ||
                 event.getPacketType() == PacketType.Play.Client.PLAYER_POSITION) && !player.compensatedEntities.getSelf().inVehicle()) {
             positions++;
-        } else if ((event.getPacketType() == PacketType.Play.Client.STEER_VEHICLE ||
-                event.getPacketType() == PacketType.Play.Client.VEHICLE_MOVE)
-                && player.compensatedEntities.getSelf().inVehicle()) {
+        } else if (event.getPacketType() == PacketType.Play.Client.STEER_VEHICLE && player.compensatedEntities.getSelf().inVehicle()) {
             positions++;
         }
     }

src/main/java/ac/grim/grimac/checks/impl/badpackets/BadPacketsX.java

@@ -1,6 +1,5 @@
 package ac.grim.grimac.checks.impl.badpackets;
 
-import ac.grim.grimac.GrimAPI;
 import ac.grim.grimac.checks.Check;
 import ac.grim.grimac.checks.CheckData;
 import ac.grim.grimac.checks.type.PacketCheck;
@@ -9,48 +8,22 @@ import com.github.retrooper.packetevents.event.PacketReceiveEvent;
 import com.github.retrooper.packetevents.protocol.item.type.ItemTypes;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
 import com.github.retrooper.packetevents.protocol.player.DiggingAction;
-import com.github.retrooper.packetevents.protocol.world.states.WrappedBlockState;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateType;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
-import com.github.retrooper.packetevents.util.Vector3d;
-import com.github.retrooper.packetevents.util.Vector3i;
 import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerDigging;
 
-@CheckData(name = "BadPacketsX")
+@CheckData(name = "BadPacketsX", experimental = true)
 public class BadPacketsX extends Check implements PacketCheck {
     public BadPacketsX(GrimPlayer player) {
         super(player);
     }
 
-    private int lastTick;
-    private boolean didLastFlag;
-    private Vector3i lastBreakLoc;
-    private StateType lastBlockType;
-
     public final boolean noFireHitbox = player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_15_2);
 
     public final void handle(PacketReceiveEvent event, WrapperPlayClientPlayerDigging dig, StateType block) {
         if (dig.getAction() != DiggingAction.START_DIGGING && dig.getAction() != DiggingAction.FINISHED_DIGGING)
             return;
 
-        // Fixes false from breaking kelp underwater
-        // The client sends two start digging packets to the server both in the same tick. BadPacketsX gets called twice, doesn't false the first time, but falses the second
-        // One ends up breaking the kelp, the other ends up doing nothing besides falsing this check because we think they're trying to mine water
-        // I am explicitly making this patch as narrow and specific as possible to potentially discover other blocks that exhibit similar behaviour
-        int newTick = GrimAPI.INSTANCE.getTickManager().currentTick;
-        if (lastTick == newTick
-                && lastBreakLoc.equals(dig.getBlockPosition())
-                && !didLastFlag
-                && lastBlockType.getHardness() == 0.0F
-                && lastBlockType.getBlastResistance() == 0.0F
-                && block == StateTypes.WATER
-        ) {
-            return;
-        }
-        lastTick = newTick;
-        lastBreakLoc = dig.getBlockPosition();
-        lastBlockType = block;
-
         // the block does not have a hitbox
         boolean invalid = (block == StateTypes.LIGHT && !(player.getInventory().getHeldItem().is(ItemTypes.LIGHT) || player.getInventory().getOffHand().is(ItemTypes.LIGHT)))
                 || block.isAir()
@@ -63,11 +36,8 @@ public class BadPacketsX extends Check implements PacketCheck {
                 || block.getHardness() == -1.0f && dig.getAction() == DiggingAction.FINISHED_DIGGING;
 
         if (invalid && flagAndAlert("block=" + block.getName() + ", type=" + dig.getAction()) && shouldModifyPackets()) {
-            didLastFlag = true;
             event.setCancelled(true);
             player.onPacketCancel();
-        } else {
-            didLastFlag = false;
         }
     }
 }

src/main/java/ac/grim/grimac/checks/impl/badpackets/BadPacketsZ.java

@@ -16,7 +16,7 @@ import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPl
 import static ac.grim.grimac.events.packets.patch.ResyncWorldUtil.resyncPosition;
 import static ac.grim.grimac.utils.nmsutil.BlockBreakSpeed.getBlockDamage;
 
-@CheckData(name = "BadPacketsZ")
+@CheckData(name = "BadPacketsZ", experimental = true)
 public class BadPacketsZ extends Check implements PacketCheck {
     public BadPacketsZ(final GrimPlayer player) {
         super(player);

src/main/java/ac/grim/grimac/checks/impl/combat/MultiInteractA.java

@@ -59,7 +59,7 @@ public class MultiInteractA extends Check implements PostPredictionCheck {
         // we don't need to check pre-1.9 players here (no tick skipping)
         if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
 
-        if (player.isTickingReliablyFor(3) && !player.uncertaintyHandler.lastVehicleSwitch.hasOccurredSince(0)) {
+        if (player.isTickingReliablyFor(3)) {
             for (String verbose : flags) {
                 flagAndAlert(verbose);
             }

src/main/java/ac/grim/grimac/checks/impl/combat/MultiInteractB.java

@@ -60,7 +60,7 @@ public class MultiInteractB extends Check implements PostPredictionCheck {
         // we don't need to check pre-1.9 players here (no tick skipping)
         if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
 
-        if (player.isTickingReliablyFor(3) && !player.uncertaintyHandler.lastVehicleSwitch.hasOccurredSince(0)) {
+        if (player.isTickingReliablyFor(3)) {
             for (String verbose : flags) {
                 flagAndAlert(verbose);
             }

src/main/java/ac/grim/grimac/checks/impl/combat/Reach.java

@@ -21,9 +21,13 @@ import ac.grim.grimac.checks.CheckData;
 import ac.grim.grimac.checks.type.PacketCheck;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.utils.collisions.datatypes.SimpleCollisionBox;
+import ac.grim.grimac.utils.data.HitData;
+import ac.grim.grimac.utils.data.Pair;
 import ac.grim.grimac.utils.data.packetentity.PacketEntity;
+import ac.grim.grimac.utils.nmsutil.BlockRayTrace;
 import ac.grim.grimac.utils.data.packetentity.dragon.PacketEntityEnderDragonPart;
 import ac.grim.grimac.utils.nmsutil.ReachUtils;
+import ac.grim.grimac.utils.vector.Vector3D;
 import com.github.retrooper.packetevents.event.PacketReceiveEvent;
 import com.github.retrooper.packetevents.protocol.attribute.Attributes;
 import com.github.retrooper.packetevents.protocol.entity.type.EntityType;
@@ -31,14 +35,24 @@ import com.github.retrooper.packetevents.protocol.entity.type.EntityTypes;
 import com.github.retrooper.packetevents.protocol.packettype.PacketType;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
 import com.github.retrooper.packetevents.protocol.player.GameMode;
+import com.github.retrooper.packetevents.protocol.world.states.WrappedBlockState;
 import com.github.retrooper.packetevents.util.Vector3d;
+import com.github.retrooper.packetevents.util.Vector3i;
 import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientInteractEntity;
 import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerFlying;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
+import org.jetbrains.annotations.Nullable;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
 
 // You may not copy the check unless you are licensed under GPL
 @CheckData(name = "Reach", configName = "Reach", setback = 10)
@@ -46,11 +60,15 @@ public class Reach extends Check implements PacketCheck {
     // Only one flag per reach attack, per entity, per tick.
     // We store position because lastX isn't reliable on teleports.
     private final Int2ObjectMap<Vector3d> playerAttackQueue = new Int2ObjectOpenHashMap<>();
+    // Used to prevent falses in the wall hit check
+    private final Set<Vector3i> blocksChangedThisTick = new HashSet<>();
+
     private static final List<EntityType> blacklisted = Arrays.asList(
             EntityTypes.BOAT,
             EntityTypes.CHEST_BOAT,
             EntityTypes.SHULKER);
 
+    private boolean ignoreNonPlayerTargets;
     private boolean cancelImpossibleHits;
     private double threshold;
     private double cancelBuffer; // For the next 4 hits after using reach, we aggressively cancel reach
@@ -84,6 +102,10 @@ public class Reach extends Check implements PacketCheck {
                 return;
             }
 
+            if (ignoreNonPlayerTargets && !entity.getType().equals(EntityTypes.PLAYER)) {
+                return;
+            }
+
             // Dead entities cause false flags (https://github.com/GrimAnticheat/Grim/issues/546)
             if (entity.isDead) return;
 
@@ -108,10 +130,11 @@ public class Reach extends Check implements PacketCheck {
         }
 
         // If the player set their look, or we know they have a new tick
-        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType()) ||
+        final boolean isFlying = WrapperPlayClientPlayerFlying.isFlying(event.getPacketType());
+        if (isFlying ||
                 event.getPacketType() == PacketType.Play.Client.PONG ||
                 event.getPacketType() == PacketType.Play.Client.WINDOW_CONFIRMATION) {
-            tickBetterReachCheckWithAngle();
+            tickBetterReachCheckWithAngle(isFlying);
         }
     }
 
@@ -143,7 +166,7 @@ public class Reach extends Check implements PacketCheck {
         }
     }
 
-    private void tickBetterReachCheckWithAngle() {
+    private void tickBetterReachCheckWithAngle(boolean isFlying) {
         for (Int2ObjectMap.Entry<Vector3d> attack : playerAttackQueue.int2ObjectEntrySet()) {
             PacketEntity reachEntity = player.compensatedEntities.entityMap.get(attack.getIntKey());
             if (reachEntity != null) {
@@ -158,6 +181,9 @@ public class Reach extends Check implements PacketCheck {
             }
         }
         playerAttackQueue.clear();
+        // We can't use transactions for this because of this problem:
+        // transaction -> block changed applied -> 2nd transaction -> list cleared -> attack packet -> flying -> reach block hit checked, falses
+        if (isFlying) blocksChangedThisTick.clear();
     }
 
     private String checkReach(PacketEntity reachEntity, Vector3d from, boolean isPrediction) {
@@ -185,7 +211,7 @@ public class Reach extends Check implements PacketCheck {
         double minDistance = Double.MAX_VALUE;
 
         // https://bugs.mojang.com/browse/MC-67665
-        List<Vector> possibleLookDirs = new ArrayList<>(Collections.singletonList(ReachUtils.getLook(player, player.xRot, player.yRot)));
+        List<Vector3D> possibleLookDirs = new ArrayList<>(Collections.singletonList(ReachUtils.getLook(player, player.xRot, player.yRot)));
 
         // If we are a tick behind, we don't know their next look so don't bother doing this
         if (!isPrediction) {
@@ -205,12 +231,12 @@ public class Reach extends Check implements PacketCheck {
         // +3 would be 3 + 3 = 6, which is the pre-1.20.5 behaviour, preventing "Missed Hitbox"
         final double distance = player.compensatedEntities.getSelf().getAttributeValue(Attributes.PLAYER_ENTITY_INTERACTION_RANGE) + 3;
         final double[] possibleEyeHeights = player.getPossibleEyeHeights();
-        for (Vector lookVec : possibleLookDirs) {
+        for (Vector3D lookVec : possibleLookDirs) {
             for (double eye : possibleEyeHeights) {
-                Vector eyePos = new Vector(from.getX(), from.getY() + eye, from.getZ());
-                Vector endReachPos = eyePos.clone().add(new Vector(lookVec.getX() * distance, lookVec.getY() * distance, lookVec.getZ() * distance));
+                ac.grim.grimac.utils.vector.Vector3D eyePos = newVector3D(from.getX(), from.getY() + eye, from.getZ());
+                ac.grim.grimac.utils.vector.Vector3D endReachPos = eyePos.clone().add(newVector3D(lookVec.getX() * distance, lookVec.getY() * distance, lookVec.getZ() * distance));
 
-                Vector intercept = ReachUtils.calculateIntercept(targetBox, eyePos, endReachPos).first();
+                Vector3D intercept = ReachUtils.calculateIntercept(targetBox, eyePos, endReachPos).getFirst();
 
                 if (ReachUtils.isVecInside(targetBox, eyePos)) {
                     minDistance = 0;
@@ -223,9 +249,25 @@ public class Reach extends Check implements PacketCheck {
             }
         }
 
+        HitData foundHitData = null;
+        // If the entity is within range of the player (we'll flag anyway if not, so no point checking blocks in this case)
+        // Ignore when could be hitting through a moving shulker, piston blocks. They are just too glitchy/uncertain to check.
+        if (minDistance <= 3 && !player.compensatedWorld.isNearHardEntity(player.boundingBox.copy().expand(4))) {
+            final @Nullable Pair<Double, HitData> targetBlock = getTargetBlock(player, possibleLookDirs, from, minDistance);
+            // And if the target block is closer to the player than the entity box, they should hit the block instead
+            // So, this hit is invalid.
+            if (targetBlock != null && targetBlock.getFirst() < (minDistance * minDistance)) { // targetBlock is squared
+                minDistance = Double.MIN_VALUE;
+                foundHitData = targetBlock.getSecond();
+            }
+        }
+
         // if the entity is not exempt and the entity is alive
         if ((!blacklisted.contains(reachEntity.getType()) && reachEntity.isLivingEntity()) || reachEntity.getType() == EntityTypes.END_CRYSTAL) {
-            if (minDistance == Double.MAX_VALUE) {
+            if (minDistance == Double.MIN_VALUE && foundHitData != null) {
+                cancelBuffer = 1;
+                return "Hit block block=" + foundHitData.getState().getType().getName();
+            } else if (minDistance == Double.MAX_VALUE) {
                 cancelBuffer = 1;
                 return "Missed hitbox";
             } else if (minDistance > player.compensatedEntities.getSelf().getAttributeValue(Attributes.PLAYER_ENTITY_INTERACTION_RANGE)) {
@@ -239,8 +281,48 @@ public class Reach extends Check implements PacketCheck {
         return null;
     }
 
+    public void handleBlockChange(Vector3i vector3i, WrappedBlockState state) {
+        if (blocksChangedThisTick.size() >= 40) return; // Don't let players freeze movement packets to grow this
+        // Only do this for nearby blocks
+        if (newVector3D(vector3i.x, vector3i.y, vector3i.z).distanceSquared(newVector3D(player.x, player.y, player.z)) > 6) return;
+        // Only do this if the state really had any world impact
+        if (state.equals(player.compensatedWorld.getWrappedBlockStateAt(vector3i))) return;
+        blocksChangedThisTick.add(vector3i);
+    }
+
+    // Returns a pair so we can check the block type in the flag
+    @Nullable
+    private Pair<Double, HitData> getTargetBlock(GrimPlayer player, List<Vector3D> possibleLookDirs, Vector3d from, double minDistance) {
+        // Check every possible look direction and every possible eye height
+        // IF *NONE* of them allow the player to hit the entity, this is an invalid hit
+        HitData bestHitData = null;
+        double min = Double.MAX_VALUE;
+        for (Vector3D lookVec : possibleLookDirs) {
+            for (double eye : player.getPossibleEyeHeights()) {
+                Vector3D eyes = newVector3D(from.getX(), from.getY() + eye, from.getZ());
+                final double reach = player.compensatedEntities.getSelf().getAttributeValue(Attributes.PLAYER_BLOCK_INTERACTION_RANGE);
+                final HitData hitResult = BlockRayTrace.getNearestReachHitResult(player, eyes, lookVec, minDistance, reach);
+                if (hitResult == null) {
+                    return null;
+                }
+
+                final double distance = eyes.distanceSquared(hitResult.getBlockHitLocation());
+                // Block changes are uncertain, can't check this tick
+                if (distance < (minDistance * minDistance) && blocksChangedThisTick.contains(hitResult.getPosition())) {
+                    return null;
+                }
+
+                bestHitData = hitResult;
+                min = Math.min(min, distance);
+            }
+        }
+
+        return bestHitData == null ? null : Pair.of(min, bestHitData);
+    }
+
     @Override
     public void onReload(ConfigManager config) {
+        this.ignoreNonPlayerTargets = config.getBooleanElse("Reach.ignore-non-player-targets", false);
         this.cancelImpossibleHits = config.getBooleanElse("Reach.block-impossible-hits", true);
         this.threshold = config.getDoubleElse("Reach.threshold", 0.0005);
     }

src/main/java/ac/grim/grimac/checks/impl/inventory/InventoryA.java

@@ -0,0 +1,41 @@
+package ac.grim.grimac.checks.impl.inventory;
+
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.InventoryCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientInteractEntity;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientInteractEntity.InteractAction;
+
+@CheckData(name = "InventoryA", setback = 3, description = "Attacked an entity while inventory is open")
+public class InventoryA extends InventoryCheck {
+    public InventoryA(GrimPlayer player) {
+        super(player);
+    }
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        super.onPacketReceive(event);
+
+        if (event.getPacketType() == PacketType.Play.Client.INTERACT_ENTITY) {
+            WrapperPlayClientInteractEntity wrapper = new WrapperPlayClientInteractEntity(event);
+
+            if (wrapper.getAction() != InteractAction.ATTACK) return;
+
+            // Is not possible to attack while the inventory is open.
+            if (player.hasInventoryOpen) {
+                if (flagAndAlert()) {
+                    // Cancel the packet
+                    if (shouldModifyPackets()) {
+                        event.setCancelled(true);
+                        player.onPacketCancel();
+                    }
+                    closeInventory();
+                }
+            } else {
+                reward();
+            }
+        }
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/inventory/InventoryB.java

@@ -0,0 +1,33 @@
+package ac.grim.grimac.checks.impl.inventory;
+
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.InventoryCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.player.DiggingAction;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerDigging;
+
+@CheckData(name = "InventoryB", setback = 3, description = "Started digging blocks while inventory is open")
+public class InventoryB extends InventoryCheck {
+    public InventoryB(GrimPlayer player) {
+        super(player);
+    }
+
+    public void handle(PacketReceiveEvent event, WrapperPlayClientPlayerDigging wrapper) {
+        if (wrapper.getAction() != DiggingAction.START_DIGGING) return;
+
+        // Is not possible to start digging a block while the inventory is open.
+        if (player.hasInventoryOpen) {
+            if (flagAndAlert()) {
+                // Cancel the packet
+                if (shouldModifyPackets()) {
+                    event.setCancelled(true);
+                    player.onPacketCancel();
+                }
+                closeInventory();
+            }
+        } else {
+            reward();
+        }
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/inventory/InventoryC.java

@@ -0,0 +1,28 @@
+package ac.grim.grimac.checks.impl.inventory;
+
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.InventoryCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.BlockPlace;
+
+@CheckData(name = "InventoryC", setback = 3, description = "Placed a block while inventory is open")
+public class InventoryC extends InventoryCheck {
+
+    public InventoryC(GrimPlayer player) {
+        super(player);
+    }
+
+    public void onBlockPlace(final BlockPlace place) {
+        // It is not possible to place a block while the inventory is open
+        if (player.hasInventoryOpen) {
+            if (flagAndAlert()) {
+                if (shouldModifyPackets()) {
+                    place.resync();
+                }
+                closeInventory();
+            }
+        } else {
+            reward();
+        }
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/inventory/InventoryD.java

@@ -0,0 +1,84 @@
+package ac.grim.grimac.checks.impl.inventory;
+
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.InventoryCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import ac.grim.grimac.utils.data.VectorData;
+import ac.grim.grimac.utils.data.VectorData.MoveVectorData;
+import ac.grim.grimac.utils.data.VehicleData;
+
+import java.util.StringJoiner;
+
+@CheckData(name = "InventoryD", setback = 1, decay = 0.25)
+public class InventoryD extends InventoryCheck {
+    private int horseJumpVerbose;
+
+    public InventoryD(GrimPlayer player) {
+        super(player);
+    }
+
+    @Override
+    public void onPredictionComplete(final PredictionComplete predictionComplete) {
+        if (!predictionComplete.isChecked() ||
+                predictionComplete.getData().isTeleport() ||
+                player.getSetbackTeleportUtil().blockOffsets ||
+                player.packetStateData.lastPacketWasTeleport ||
+                player.packetStateData.isSlowedByUsingItem() ||
+                System.currentTimeMillis() - player.lastBlockPlaceUseItem < 50L) {
+            return;
+        }
+
+        if (player.hasInventoryOpen) {
+            boolean inVehicle = player.compensatedEntities.getSelf().inVehicle();
+            boolean isJumping, isMoving;
+
+            if (inVehicle) {
+                VehicleData vehicle = player.vehicleData;
+
+                // Will flag once if player open anything with pressed space bar
+                isJumping = vehicle.nextHorseJump > 0 && horseJumpVerbose++ >= 1;
+                isMoving = vehicle.nextVehicleForward != 0 || vehicle.nextVehicleHorizontal != 0;
+            } else {
+                MoveVectorData move = findMovement(player.predictedVelocity);
+
+                isJumping = player.predictedVelocity.isJump();
+                isMoving = move != null && (move.x != 0 || move.z != 0);
+            }
+
+            if (!isMoving && !isJumping) {
+                reward();
+                return;
+            }
+
+            if (flag()) {
+                closeInventory();
+
+                StringJoiner joiner = new StringJoiner(" ");
+
+                if (isMoving) joiner.add("moving");
+                if (isJumping) joiner.add("jumping");
+                if (inVehicle) joiner.add("inVehicle");
+
+                alert(joiner.toString());
+            }
+        } else {
+            horseJumpVerbose = 0;
+        }
+    }
+
+    private MoveVectorData findMovement(VectorData vectorData) {
+        if (vectorData instanceof MoveVectorData) {
+            return (MoveVectorData) vectorData;
+        }
+
+        while (vectorData != null) {
+            vectorData = vectorData.lastVector;
+            if (vectorData instanceof MoveVectorData) {
+                return (MoveVectorData) vectorData;
+            }
+        }
+
+        return null;
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/inventory/InventoryE.java

@@ -0,0 +1,48 @@
+package ac.grim.grimac.checks.impl.inventory;
+
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.InventoryCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.event.PacketSendEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+
+@CheckData(name = "InventoryE", setback = 3, description = "Sent a held item change packet while inventory is open")
+public class InventoryE extends InventoryCheck {
+    private long lastTransaction = Long.MAX_VALUE; // Impossible transaction ID
+
+    public InventoryE(GrimPlayer player) {
+        super(player);
+    }
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        super.onPacketReceive(event);
+
+        if (event.getPacketType() == PacketType.Play.Client.HELD_ITEM_CHANGE) {
+            // It is not possible to change hotbar slots with held item change while the inventory is open
+            // A container click packet would be sent instead
+            if (player.hasInventoryOpen) {
+                if (this.lastTransaction < player.lastTransactionReceived.get()
+                        && flagAndAlert()) {
+                    // Cancel the packet
+                    if (shouldModifyPackets()) {
+                        event.setCancelled(true);
+                        player.onPacketCancel();
+                        player.getInventory().needResend = true;
+                    }
+                    closeInventory();
+                }
+            } else {
+                reward();
+            }
+        }
+    }
+
+    @Override
+    public void onPacketSend(PacketSendEvent event) {
+        if (event.getPacketType() == PacketType.Play.Server.HELD_ITEM_CHANGE) {
+            this.lastTransaction = player.lastTransactionSent.get();
+        }
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/inventory/InventoryF.java

@@ -0,0 +1,44 @@
+package ac.grim.grimac.checks.impl.inventory;
+
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.InventoryCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.inventory.InventoryDesyncStatus;
+import com.github.retrooper.packetevents.PacketEvents;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.manager.server.ServerVersion;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+
+@CheckData(name = "InventoryF", setback = 3, description = "Sent a click window packet without a open inventory", experimental = true)
+public class InventoryF extends InventoryCheck {
+
+    public InventoryF(GrimPlayer player) {
+        super(player);
+    }
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        // Exempt on 1.9+ server version due to the Via hack done in PacketPlayerWindow, the exemption can be deleted
+        // once we are ahead of ViaVersion
+        if (PacketEvents.getAPI().getServerManager().getVersion().isNewerThanOrEquals(ServerVersion.V_1_9)
+                || player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_9)) return;
+
+        super.onPacketReceive(event);
+
+        if (event.getPacketType() == PacketType.Play.Client.CLICK_WINDOW) {
+            if (!player.hasInventoryOpen && player.inventoryDesyncStatus == InventoryDesyncStatus.NOT_DESYNCED) {
+                if (flagAndAlert()) {
+                    // Cancel the packet
+                    if (shouldModifyPackets()) {
+                        event.setCancelled(true);
+                        player.onPacketCancel();
+                    }
+                    closeInventory();
+                }
+            } else {
+                reward();
+            }
+        }
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/inventory/InventoryG.java

@@ -0,0 +1,40 @@
+package ac.grim.grimac.checks.impl.inventory;
+
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.InventoryCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientEntityAction;
+
+@CheckData(name = "InventoryG", setback = 3, description = "Sent a entity action packet while inventory is open", experimental = true)
+public class InventoryG extends InventoryCheck {
+
+    public InventoryG(GrimPlayer player) {
+        super(player);
+    }
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (player.packetStateData.lastPacketWasTeleport) return;
+        super.onPacketReceive(event);
+
+        if (event.getPacketType() == PacketType.Play.Client.ENTITY_ACTION) {
+            WrapperPlayClientEntityAction wrapper = new WrapperPlayClientEntityAction(event);
+            WrapperPlayClientEntityAction.Action action = wrapper.getAction();
+
+            if (action == WrapperPlayClientEntityAction.Action.STOP_SNEAKING
+                    || action == WrapperPlayClientEntityAction.Action.STOP_SPRINTING) {
+                return;
+            }
+
+            if (player.hasInventoryOpen) {
+                if (flagAndAlert()) {
+                    closeInventory();
+                }
+            } else {
+                reward();
+            }
+        }
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/misc/TransactionOrder.java

@@ -1,16 +0,0 @@
-package ac.grim.grimac.checks.impl.misc;
-
-import ac.grim.grimac.checks.Check;
-import ac.grim.grimac.checks.CheckData;
-import ac.grim.grimac.checks.type.PacketCheck;
-import ac.grim.grimac.player.GrimPlayer;
-
-
-@CheckData(name = "TransactionOrder", experimental = false)
-public class TransactionOrder extends Check implements PacketCheck {
-
-    public TransactionOrder(GrimPlayer player) {
-        super(player);
-    }
-
-}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderA.java

@@ -0,0 +1,54 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientClickWindow;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientClickWindow.WindowClickType;
+
+@CheckData(name = "PacketOrderA", experimental = true)
+public class PacketOrderA extends Check implements PostPredictionCheck {
+    public PacketOrderA(final GrimPlayer player) {
+        super(player);
+    }
+
+    private int invalid;
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.CLICK_WINDOW) {
+            final WindowClickType clickType = new WrapperPlayClientClickWindow(event).getWindowClickType();
+
+            if ((clickType == WindowClickType.PICKUP || clickType == WindowClickType.PICKUP_ALL) && player.packetOrderProcessor.isQuickMoveClicking()
+                    || clickType == WindowClickType.QUICK_MOVE && player.packetOrderProcessor.isPickUpClicking()) {
+                if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                    if (flagAndAlert() && shouldModifyPackets()) {
+                        event.setCancelled(true);
+                        player.onPacketCancel();
+                    }
+                } else {
+                    invalid++;
+                }
+            }
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        // we don't need to check pre-1.9 players here (no tick skipping)
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
+
+        if (player.isTickingReliablyFor(3)) {
+            for (; invalid >= 1; invalid--) {
+                flagAndAlert();
+            }
+        }
+
+        invalid = 0;
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderB.java

@@ -1,4 +1,4 @@
-package ac.grim.grimac.checks.impl.badpackets;
+package ac.grim.grimac.checks.impl.packetorder;
 
 import ac.grim.grimac.checks.Check;
 import ac.grim.grimac.checks.CheckData;
@@ -11,15 +11,15 @@ import com.github.retrooper.packetevents.protocol.packettype.PacketType;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
 import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientInteractEntity;
 
-@CheckData(name = "BadPacketsH")
-public class BadPacketsH extends Check implements PacketCheck {
+@CheckData(name = "PacketOrderB")
+public class PacketOrderB extends Check implements PacketCheck {
 
     // 1.9 packet order: INTERACT -> ANIMATION
     // 1.8 packet order: ANIMATION -> INTERACT
     // I personally think 1.8 made much more sense. You swing and THEN you hit!
     private boolean sentAnimation = player.getClientVersion().isNewerThan(ClientVersion.V_1_8);
 
-    public BadPacketsH(final GrimPlayer player) {
+    public PacketOrderB(final GrimPlayer player) {
         super(player);
     }
 

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderC.java

@@ -1,4 +1,4 @@
-package ac.grim.grimac.checks.impl.badpackets;
+package ac.grim.grimac.checks.impl.packetorder;
 
 import ac.grim.grimac.checks.Check;
 import ac.grim.grimac.checks.CheckData;
@@ -9,25 +9,33 @@ import com.github.retrooper.packetevents.event.PacketReceiveEvent;
 import com.github.retrooper.packetevents.protocol.entity.type.EntityTypes;
 import com.github.retrooper.packetevents.protocol.packettype.PacketType;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.player.InteractionHand;
 import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientInteractEntity;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerFlying;
 
-@CheckData(name = "BadPacketsM", experimental = true)
-public class BadPacketsM extends Check implements PacketCheck {
-    public BadPacketsM(final GrimPlayer player) {
+@CheckData(name = "PacketOrderC", experimental = true)
+public class PacketOrderC extends Check implements PacketCheck {
+    public PacketOrderC(final GrimPlayer player) {
         super(player);
     }
 
     // 1.7 players do not send INTERACT_AT, so we cannot check them
     private final boolean exempt = player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_7_10);
     private boolean sentInteractAt = false;
+    private int requiredEntity;
+    private InteractionHand requiredHand;
+    private boolean requiredSneaking;
 
     @Override
     public void onPacketReceive(PacketReceiveEvent event) {
-        if (event.getPacketType() == PacketType.Play.Client.INTERACT_ENTITY && !exempt) {
+        if (exempt) {
+            return;
+        }
 
-            final WrapperPlayClientInteractEntity wrapper = new WrapperPlayClientInteractEntity(event);
+        if (event.getPacketType() == PacketType.Play.Client.INTERACT_ENTITY) {
+            final WrapperPlayClientInteractEntity packet = new WrapperPlayClientInteractEntity(event);
 
-            final PacketEntity entity = player.compensatedEntities.entityMap.get(wrapper.getEntityId());
+            final PacketEntity entity = player.compensatedEntities.entityMap.get(packet.getEntityId());
 
             // For armor stands, vanilla clients send:
             //  - when renaming the armor stand or in spectator mode: INTERACT_AT + INTERACT
@@ -35,27 +43,49 @@ public class BadPacketsM extends Check implements PacketCheck {
             // Just exempt armor stands to be safe
             if (entity != null && entity.getType() == EntityTypes.ARMOR_STAND) return;
 
-            switch (wrapper.getAction()) {
+            final boolean sneaking = packet.isSneaking().orElse(false);
+
+            switch (packet.getAction()) {
                 // INTERACT_AT then INTERACT
                 case INTERACT:
                     if (!sentInteractAt) {
-                        if (flagAndAlert("Missed Interact-At") && shouldModifyPackets()) {
+                        if (flagAndAlert("Skipped Interact-At") && shouldModifyPackets()) {
+                            event.setCancelled(true);
+                            player.onPacketCancel();
+                        }
+                    } else if (packet.getEntityId() != requiredEntity || packet.getHand() != requiredHand || sneaking != requiredSneaking) {
+                        String verbose = "requiredEntity=" + requiredEntity + ", entity=" + packet.getEntityId()
+                                + ", requiredHand=" + requiredHand + ", hand=" + packet.getHand()
+                                + ", requiredSneaking=" + requiredSneaking + ", sneaking=" + sneaking;
+                        if (flagAndAlert(verbose) && shouldModifyPackets()) {
                             event.setCancelled(true);
                             player.onPacketCancel();
                         }
                     }
+
                     sentInteractAt = false;
                     break;
                 case INTERACT_AT:
                     if (sentInteractAt) {
-                        if (flagAndAlert("Missed Interact") && shouldModifyPackets()) {
+                        if (flagAndAlert("Skipped Interact") && shouldModifyPackets()) {
                             event.setCancelled(true);
                             player.onPacketCancel();
                         }
                     }
+
+                    requiredHand = packet.getHand();
+                    requiredEntity = packet.getEntityId();
+                    requiredSneaking = sneaking;
                     sentInteractAt = true;
                     break;
             }
         }
+
+        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType())) {
+            if (sentInteractAt) {
+                sentInteractAt = false;
+                flagAndAlert("Skipped Interact (Tick)");
+            }
+        }
     }
 }

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderD.java

@@ -0,0 +1,13 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PacketCheck;
+import ac.grim.grimac.player.GrimPlayer;
+
+@CheckData(name = "PacketOrderD")
+public class PacketOrderD extends Check implements PacketCheck {
+    public PacketOrderD(GrimPlayer player) {
+        super(player);
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderE.java

@@ -0,0 +1,66 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+
+@CheckData(name = "PacketOrderE", experimental = true)
+public class PacketOrderE extends Check implements PostPredictionCheck {
+    public PacketOrderE(final GrimPlayer player) {
+        super(player);
+    }
+
+    private int invalid;
+    private boolean setback;
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.HELD_ITEM_CHANGE) {
+            if (player.packetOrderProcessor.isAttacking()
+                    || player.packetOrderProcessor.isRightClicking()
+                    || player.packetOrderProcessor.isOpeningInventory()
+                    || player.packetOrderProcessor.isReleasing()
+                    || player.packetOrderProcessor.isSneaking()
+                    || player.packetOrderProcessor.isSprinting()
+                    || player.packetOrderProcessor.isLeavingBed()
+                    || player.packetOrderProcessor.isStartingToGlide()
+                    || player.packetOrderProcessor.isJumpingWithMount()
+            ) {
+                if (player.getClientVersion().isNewerThan(ClientVersion.V_1_8) || flagAndAlert()) {
+                    invalid++;
+
+                    if (player.packetOrderProcessor.isUsing()) {
+                        setback = true;
+                    }
+                }
+            }
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+            if (setback) {
+                setback = false;
+                setbackIfAboveSetbackVL();
+            }
+            return;
+        }
+
+        if (player.isTickingReliablyFor(3)) {
+            for (; invalid >= 1; invalid--) {
+                if (flagAndAlert() && setback) {
+                    setback = false;
+                    setbackIfAboveSetbackVL();
+                }
+            }
+        }
+
+        invalid = 0;
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderF.java

@@ -0,0 +1,61 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.player.DiggingAction;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientClientStatus;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerDigging;
+
+@CheckData(name = "PacketOrderF", experimental = true)
+public class PacketOrderF extends Check implements PostPredictionCheck {
+    public PacketOrderF(GrimPlayer player) {
+        super(player);
+    }
+
+    private int invalid;
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.INTERACT_ENTITY
+                || event.getPacketType() == PacketType.Play.Client.PLAYER_BLOCK_PLACEMENT
+                || event.getPacketType() == PacketType.Play.Client.USE_ITEM
+                || event.getPacketType() == PacketType.Play.Client.PICK_ITEM
+                || event.getPacketType() == PacketType.Play.Client.PLAYER_DIGGING
+                || (event.getPacketType() == PacketType.Play.Client.CLIENT_STATUS
+                && new WrapperPlayClientClientStatus(event).getAction() == WrapperPlayClientClientStatus.Action.OPEN_INVENTORY_ACHIEVEMENT)
+        ) if (player.packetOrderProcessor.isSprinting() || player.packetOrderProcessor.isSneaking()) {
+            if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                if (flagAndAlert() && shouldModifyPackets()) {
+                    if (event.getPacketType() == PacketType.Play.Client.PLAYER_DIGGING
+                            && new WrapperPlayClientPlayerDigging(event).getAction() == DiggingAction.RELEASE_USE_ITEM
+                    ) return; // don't cause a noslow
+
+                    event.setCancelled(true);
+                    player.onPacketCancel();
+                }
+            } else {
+                invalid++;
+            }
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        // we don't need to check pre-1.9 players here (no tick skipping)
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
+
+        if (player.isTickingReliablyFor(3)) {
+            for (; invalid >= 1; invalid--) {
+                flagAndAlert();
+            }
+        }
+
+        invalid = 0;
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderG.java

@@ -0,0 +1,69 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.player.DiggingAction;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientClientStatus;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerDigging;
+
+@CheckData(name = "PacketOrderG", experimental = true)
+public class PacketOrderG extends Check implements PostPredictionCheck {
+    public PacketOrderG(GrimPlayer player) {
+        super(player);
+    }
+
+    private int invalid;
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.PLAYER_DIGGING
+                || (event.getPacketType() == PacketType.Play.Client.CLIENT_STATUS
+                && new WrapperPlayClientClientStatus(event).getAction() == WrapperPlayClientClientStatus.Action.OPEN_INVENTORY_ACHIEVEMENT)
+        ) {
+            if (event.getPacketType() == PacketType.Play.Client.PLAYER_DIGGING) {
+                final DiggingAction action = new WrapperPlayClientPlayerDigging(event).getAction();
+                if (action == DiggingAction.RELEASE_USE_ITEM
+                        || action == DiggingAction.START_DIGGING
+                        || action == DiggingAction.CANCELLED_DIGGING
+                        || action == DiggingAction.FINISHED_DIGGING
+                ) return;
+            }
+
+            if (player.packetOrderProcessor.isAttacking()
+                    || player.packetOrderProcessor.isReleasing()
+                    || player.packetOrderProcessor.isRightClicking()
+                    || player.packetOrderProcessor.isPicking()
+                    || player.packetOrderProcessor.isDigging()
+            ) {
+                if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                    if (flagAndAlert() && shouldModifyPackets()) {
+                        event.setCancelled(true);
+                        player.onPacketCancel();
+                    }
+                } else {
+                    invalid++;
+                }
+            }
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        // we don't need to check pre-1.9 players here (no tick skipping)
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
+
+        if (player.isTickingReliablyFor(3)) {
+            for (; invalid >= 1; invalid--) {
+                flagAndAlert();
+            }
+        }
+
+        invalid = 0;
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderH.java

@@ -0,0 +1,51 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientEntityAction;
+
+@CheckData(name = "PacketOrderH", experimental = true)
+public class PacketOrderH extends Check implements PostPredictionCheck {
+    public PacketOrderH(final GrimPlayer player) {
+        super(player);
+    }
+
+    private int invalid;
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.ENTITY_ACTION) {
+            switch (new WrapperPlayClientEntityAction(event).getAction()) {
+                case START_SPRINTING:
+                case STOP_SPRINTING:
+                    if (player.packetOrderProcessor.isSneaking()) {
+                        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                            flagAndAlert();
+                        } else {
+                            invalid++;
+                        }
+                    }
+            }
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        // we don't need to check pre-1.9 players here (no tick skipping)
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
+
+        if (player.isTickingReliablyFor(3)) {
+            for (; invalid >= 1; invalid--) {
+                flagAndAlert();
+            }
+        }
+
+        invalid = 0;
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderI.java

@@ -0,0 +1,130 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.api.config.ConfigManager;
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import ac.grim.grimac.utils.nmsutil.BlockBreakSpeed;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.player.GameMode;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientInteractEntity;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerDigging;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerFlying;
+
+import java.util.ArrayDeque;
+
+@CheckData(name = "PacketOrderI", experimental = true)
+public class PacketOrderI extends Check implements PostPredictionCheck {
+    public PacketOrderI(final GrimPlayer player) {
+        super(player);
+    }
+
+    private boolean exemptPlacingWhileDigging;
+
+    private boolean setback;
+    private boolean digging; // for placing
+    private final ArrayDeque<String> flags = new ArrayDeque<>();
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.INTERACT_ENTITY) {
+            if (new WrapperPlayClientInteractEntity(event).getAction() == WrapperPlayClientInteractEntity.InteractAction.ATTACK) {
+                if (player.packetOrderProcessor.isRightClicking() || player.packetOrderProcessor.isPicking() || player.packetOrderProcessor.isReleasing() || player.packetOrderProcessor.isDigging()) {
+                    if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                        if (flagAndAlert("attack") && shouldModifyPackets()) {
+                            event.setCancelled(true);
+                            player.onPacketCancel();
+                        }
+                    } else {
+                        flags.add("attack");
+                    }
+                }
+            } else if (player.packetOrderProcessor.isReleasing() || player.packetOrderProcessor.isDigging()) {
+                if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                    if (flagAndAlert("interact") && shouldModifyPackets()) {
+                        event.setCancelled(true);
+                        player.onPacketCancel();
+                    }
+                } else {
+                    flags.add("interact");
+                }
+            }
+        }
+
+        if (event.getPacketType() == PacketType.Play.Client.PLAYER_BLOCK_PLACEMENT || event.getPacketType() == PacketType.Play.Client.USE_ITEM) {
+            if (player.packetOrderProcessor.isReleasing() || digging) {
+                if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                    if (flagAndAlert("place/use") && shouldModifyPackets()) {
+                        event.setCancelled(true);
+                        player.onPacketCancel();
+                    }
+                } else {
+                    flags.add("place");
+                }
+            }
+        }
+
+        if (event.getPacketType() == PacketType.Play.Client.PLAYER_DIGGING) {
+            WrapperPlayClientPlayerDigging packet = new WrapperPlayClientPlayerDigging(event);
+
+            switch (packet.getAction()) {
+                case RELEASE_USE_ITEM:
+                    if (player.packetOrderProcessor.isAttacking() || player.packetOrderProcessor.isRightClicking() || player.packetOrderProcessor.isPicking() || player.packetOrderProcessor.isDigging()) {
+                        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                            if (flagAndAlert("release")) {
+                                setback = true;
+                            }
+                        } else {
+                            flags.add("release");
+                            setback = true;
+                        }
+                    }
+                    break;
+                case START_DIGGING:
+                    double damage = BlockBreakSpeed.getBlockDamage(player, packet.getBlockPosition());
+                    if (damage >= 1 || damage <= 0 && player.gamemode == GameMode.CREATIVE) {
+                        return;
+                    }
+                case CANCELLED_DIGGING:
+                case FINISHED_DIGGING:
+                    if (exemptPlacingWhileDigging || player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_7_10)) {
+                        return;
+                    }
+                    digging = true;
+            }
+        }
+
+        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType()) && player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8) && !player.packetStateData.lastPacketWasTeleport) {
+            digging = false;
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+            if (setback) {
+                setbackIfAboveSetbackVL();
+                setback = false;
+            }
+        } else if (player.isTickingReliablyFor(3)) {
+            for (String verbose : flags) {
+                if (flagAndAlert(verbose) && setback) {
+                    setbackIfAboveSetbackVL();
+                    setback = false;
+                }
+            }
+        }
+
+        flags.clear();
+        setback = digging = false;
+    }
+
+    @Override
+    public void onReload(ConfigManager config) {
+        exemptPlacingWhileDigging = config.getBooleanElse(getConfigName() + ".exempt-placing-while-digging", false);
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderJ.java

@@ -0,0 +1,49 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+
+@CheckData(name = "PacketOrderJ", experimental = true)
+public class PacketOrderJ extends Check implements PostPredictionCheck {
+    public PacketOrderJ(final GrimPlayer player) {
+        super(player);
+    }
+
+    private int invalid;
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.PLAYER_BLOCK_PLACEMENT || event.getPacketType() == PacketType.Play.Client.USE_ITEM) {
+            if (player.packetOrderProcessor.isAttacking() && !player.packetOrderProcessor.isInteracting()) {
+                if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                    if (flagAndAlert() && shouldModifyPackets()) {
+                        event.setCancelled(true);
+                        player.onPacketCancel();
+                    }
+                } else {
+                    invalid++;
+                }
+            }
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        // we don't need to check pre-1.9 players here (no tick skipping)
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
+
+        if (player.isTickingReliablyFor(3)) {
+            for (; invalid >= 1; invalid--) {
+                flagAndAlert();
+            }
+        }
+
+        invalid = 0;
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderK.java

@@ -0,0 +1,64 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientClientStatus;
+
+import java.util.ArrayDeque;
+
+@CheckData(name = "PacketOrderK", experimental = true)
+public class PacketOrderK extends Check implements PostPredictionCheck {
+    public PacketOrderK(final GrimPlayer player) {
+        super(player);
+    }
+
+    private final ArrayDeque<String> flags = new ArrayDeque<>();
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.CLIENT_STATUS) {
+            if (new WrapperPlayClientClientStatus(event).getAction() == WrapperPlayClientClientStatus.Action.OPEN_INVENTORY_ACHIEVEMENT) {
+                if (player.packetOrderProcessor.isClickingInInventory() || player.packetOrderProcessor.isClosingInventory()) {
+                    if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                        flagAndAlert("open");
+                    } else {
+                        flags.add("open");
+                    }
+                }
+            }
+        }
+
+        if (event.getPacketType() == PacketType.Play.Client.CLICK_WINDOW || event.getPacketType() == PacketType.Play.Client.CLOSE_WINDOW) {
+            if (player.packetOrderProcessor.isOpeningInventory()) {
+                if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                    if (flagAndAlert(event.getPacketType() == PacketType.Play.Client.CLICK_WINDOW ? "click" : "close") && shouldModifyPackets()) {
+                        event.setCancelled(true);
+                        player.onPacketCancel();
+                    }
+                } else {
+                    flags.add(event.getPacketType() == PacketType.Play.Client.CLICK_WINDOW ? "click" : "close");
+                }
+            }
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        // we don't need to check pre-1.9 players here (no tick skipping)
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
+
+        if (player.isTickingReliablyFor(3)) {
+            for (String verbose : flags) {
+                flagAndAlert(verbose);
+            }
+        }
+
+        flags.clear();
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderL.java

@@ -0,0 +1,64 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.player.DiggingAction;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientClientStatus;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerDigging;
+
+import java.util.ArrayDeque;
+
+@CheckData(name = "PacketOrderL", experimental = true)
+public class PacketOrderL extends Check implements PostPredictionCheck {
+    public PacketOrderL(final GrimPlayer player) {
+        super(player);
+    }
+
+    private final ArrayDeque<String> flags = new ArrayDeque<>();
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.CLIENT_STATUS) {
+            if (new WrapperPlayClientClientStatus(event).getAction() == WrapperPlayClientClientStatus.Action.OPEN_INVENTORY_ACHIEVEMENT) {
+                if (player.packetOrderProcessor.isDropping()) {
+                    if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                        if (flagAndAlert("inventory") && shouldModifyPackets()) {
+                            event.setCancelled(true);
+                            player.onPacketCancel();
+                        }
+                    } else {
+                        flags.add("inventory");
+                    }
+                }
+            }
+        }
+
+        if (event.getPacketType() == PacketType.Play.Client.PLAYER_DIGGING) {
+            if (new WrapperPlayClientPlayerDigging(event).getAction() == DiggingAction.SWAP_ITEM_WITH_OFFHAND) {
+                if (player.packetOrderProcessor.isDropping()) {
+                    flags.add("swap");
+                }
+            }
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        // we don't need to check pre-1.9 players here (no tick skipping)
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
+
+        if (player.isTickingReliablyFor(3)) {
+            for (String verbose : flags) {
+                flagAndAlert(verbose);
+            }
+        }
+
+        flags.clear();
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderM.java

@@ -0,0 +1,72 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.world.BlockFace;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientInteractEntity;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerBlockPlacement;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerFlying;
+
+@CheckData(name = "PacketOrderM", experimental = true)
+public class PacketOrderM extends Check implements PostPredictionCheck {
+    public PacketOrderM(final GrimPlayer player) {
+        super(player);
+    }
+
+    private int invalid;
+    private boolean usingWithoutInteract, interacting;
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.INTERACT_ENTITY) {
+            if (new WrapperPlayClientInteractEntity(event).getAction() != WrapperPlayClientInteractEntity.InteractAction.ATTACK) {
+                interacting = true;
+                if (usingWithoutInteract) {
+                    if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                        if (flagAndAlert() && shouldModifyPackets()) {
+                            event.setCancelled(true);
+                            player.onPacketCancel();
+                        }
+                    } else {
+                        invalid++;
+                    }
+                }
+            }
+        }
+
+        if (event.getPacketType() == PacketType.Play.Client.USE_ITEM
+                || event.getPacketType() == PacketType.Play.Client.PLAYER_BLOCK_PLACEMENT
+                && new WrapperPlayClientPlayerBlockPlacement(event).getFace() == BlockFace.OTHER) {
+            if (!interacting) {
+                usingWithoutInteract = true;
+            }
+
+            interacting = false;
+        }
+
+        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType()) && player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8) && !player.packetStateData.lastPacketWasTeleport) {
+            usingWithoutInteract = interacting = false;
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        // we don't need to check pre-1.9 players here (no tick skipping)
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
+
+        if (player.isTickingReliablyFor(3)) {
+            for (; invalid >= 1; invalid--) {
+                flagAndAlert();
+            }
+        }
+
+        invalid = 0;
+        usingWithoutInteract = interacting = false;
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderN.java

@@ -0,0 +1,69 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.BlockPlaceCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.BlockPlace;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.world.BlockFace;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerBlockPlacement;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerFlying;
+
+@CheckData(name = "PacketOrderN", experimental = true)
+public class PacketOrderN extends BlockPlaceCheck {
+    public PacketOrderN(final GrimPlayer player) {
+        super(player);
+    }
+
+    private int invalid;
+    private boolean usingWithoutPlacing, placing;
+
+    @Override
+    public void onBlockPlace(BlockPlace place) {
+        placing = true;
+        if (usingWithoutPlacing) {
+            if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                if (flagAndAlert() && shouldModifyPackets() && shouldCancel()) {
+                    place.resync();
+                }
+            } else {
+                invalid++;
+            }
+        }
+    }
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.USE_ITEM
+                || event.getPacketType() == PacketType.Play.Client.PLAYER_BLOCK_PLACEMENT
+                && new WrapperPlayClientPlayerBlockPlacement(event).getFace() == BlockFace.OTHER) {
+            if (!placing) {
+                usingWithoutPlacing = true;
+            }
+
+            placing = false;
+        }
+
+        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType()) && player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8) && !player.packetStateData.lastPacketWasTeleport) {
+            usingWithoutPlacing = placing = false;
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        // we don't need to check pre-1.9 players here (no tick skipping)
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) return;
+
+        if (player.isTickingReliablyFor(3)) {
+            for (; invalid >= 1; invalid--) {
+                flagAndAlert();
+            }
+        }
+
+        invalid = 0;
+        usingWithoutPlacing = placing = false;
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderO.java

@@ -0,0 +1,60 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.BlockPlaceCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.BlockPlace;
+import com.github.retrooper.packetevents.PacketEvents;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.manager.server.ServerVersion;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.player.InteractionHand;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerFlying;
+
+@CheckData(name = "PacketOrderO", experimental = true)
+public class PacketOrderO extends BlockPlaceCheck {
+    public PacketOrderO(final GrimPlayer player) {
+        super(player);
+    }
+
+    private boolean sentMainhand;
+
+    @Override
+    public void onBlockPlace(BlockPlace place) {
+        if (!isSupported()) {
+            return;
+        }
+
+        if (place.getHand() == InteractionHand.OFF_HAND) {
+            if (!sentMainhand) {
+                if (flagAndAlert("Skipped Mainhand") && shouldModifyPackets() && shouldCancel()) {
+                    place.resync();
+                }
+            }
+
+            sentMainhand = false;
+        } else {
+            if (sentMainhand) {
+                if (flagAndAlert("Skipped Offhand") && shouldModifyPackets() && shouldCancel()) {
+                    place.resync();
+                }
+            }
+
+            sentMainhand = !place.isBlock();
+        }
+    }
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType()) && !player.packetStateData.lastPacketWasTeleport && !player.packetStateData.lastPacketWasOnePointSeventeenDuplicate) {
+            if (sentMainhand) {
+                sentMainhand = false;
+                flagAndAlert("Skipped Offhand (Tick)");
+            }
+        }
+    }
+
+    private boolean isSupported() {
+        return player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_13) && PacketEvents.getAPI().getServerManager().getVersion().isNewerThanOrEquals(ServerVersion.V_1_9);
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderP.java

@@ -0,0 +1,63 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.PacketCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.player.InteractionHand;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientInteractEntity;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientInteractEntity.InteractAction;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerFlying;
+
+@CheckData(name = "PacketOrderP", experimental = true)
+public class PacketOrderP extends Check implements PacketCheck {
+    public PacketOrderP(final GrimPlayer player) {
+        super(player);
+    }
+
+    private boolean sentMainhand;
+    private int requiredEntity;
+    private boolean requiredSneaking;
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.INTERACT_ENTITY && player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_9)) {
+            final WrapperPlayClientInteractEntity packet = new WrapperPlayClientInteractEntity(event);
+            InteractAction action = packet.getAction();
+            if (action != InteractAction.ATTACK) {
+                final boolean sneaking = packet.isSneaking().orElse(false);
+                final int entity = packet.getEntityId();
+
+                if (packet.getHand() == InteractionHand.OFF_HAND) {
+                    if (action == InteractAction.INTERACT) {
+                        if (!sentMainhand) {
+                            if (flagAndAlert("Skipped Mainhand") && shouldModifyPackets()) {
+                                event.setCancelled(true);
+                                player.onPacketCancel();
+                            }
+                        }
+                        sentMainhand = false;
+                    } else if (sneaking != requiredSneaking || entity != requiredEntity) {
+                        String verbose = "requiredEntity=" + requiredEntity + ", entity=" + entity
+                                + ", requiredSneaking=" + requiredSneaking + ", sneaking=" + sneaking;
+                        if (flagAndAlert(verbose) && shouldModifyPackets()) {
+                            event.setCancelled(true);
+                            player.onPacketCancel();
+                        }
+                    }
+                } else {
+                    requiredEntity = entity;
+                    requiredSneaking = sneaking;
+                    sentMainhand = true;
+                }
+            }
+        }
+
+        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType()) && !player.packetStateData.lastPacketWasTeleport && !player.packetStateData.lastPacketWasOnePointSeventeenDuplicate) {
+            sentMainhand = false;
+        }
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/packetorder/PacketOrderProcessor.java

@@ -0,0 +1,178 @@
+package ac.grim.grimac.checks.impl.packetorder;
+
+import ac.grim.grimac.checks.Check;
+import ac.grim.grimac.checks.type.PostPredictionCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.packettype.PacketTypeCommon;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.world.BlockFace;
+import com.github.retrooper.packetevents.wrapper.play.client.*;
+import lombok.Getter;
+import org.jetbrains.annotations.Contract;
+
+@Getter
+public final class PacketOrderProcessor extends Check implements PostPredictionCheck {
+    public PacketOrderProcessor(final GrimPlayer player) {
+        super(player);
+    }
+
+    private boolean openingInventory; // only pre 1.9 clients on pre 1.9 servers
+    private boolean swapping;
+    private boolean dropping;
+    private boolean interacting;
+    private boolean attacking;
+    private boolean releasing;
+    private boolean digging;
+    private boolean sprinting;
+    private boolean sneaking;
+    private boolean placing;
+    private boolean using;
+    private boolean picking;
+    private boolean clickingInInventory;
+    private boolean closingInventory;
+    private boolean quickMoveClicking;
+    private boolean pickUpClicking;
+    private boolean leavingBed;
+    private boolean startingToGlide;
+    private boolean jumpingWithMount;
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        final PacketTypeCommon packetType = event.getPacketType();
+
+        if (packetType == PacketType.Play.Client.CLIENT_STATUS) {
+            if (new WrapperPlayClientClientStatus(event).getAction() == WrapperPlayClientClientStatus.Action.OPEN_INVENTORY_ACHIEVEMENT) {
+                openingInventory = true;
+            }
+        }
+
+        if (packetType == PacketType.Play.Client.INTERACT_ENTITY) {
+            if (new WrapperPlayClientInteractEntity(event).getAction() == WrapperPlayClientInteractEntity.InteractAction.ATTACK) {
+                attacking = true;
+            } else {
+                interacting = true;
+            }
+        }
+
+        if (packetType == PacketType.Play.Client.PLAYER_DIGGING) {
+            switch (new WrapperPlayClientPlayerDigging(event).getAction()) {
+                case SWAP_ITEM_WITH_OFFHAND:
+                    swapping = true;
+                    break;
+                case DROP_ITEM:
+                case DROP_ITEM_STACK:
+                    dropping = true;
+                    break;
+                case RELEASE_USE_ITEM:
+                    releasing = true;
+                    break;
+                case FINISHED_DIGGING:
+                case CANCELLED_DIGGING:
+                case START_DIGGING:
+                    digging = true;
+                    break;
+            }
+        }
+
+        if (packetType == PacketType.Play.Client.ENTITY_ACTION) {
+            switch (new WrapperPlayClientEntityAction(event).getAction()) {
+                case START_SPRINTING:
+                case STOP_SPRINTING:
+                    sprinting = true;
+                    break;
+                case STOP_SNEAKING:
+                case START_SNEAKING:
+                    sneaking = true;
+                    break;
+                case LEAVE_BED:
+                    leavingBed = true;
+                    break;
+                case START_FLYING_WITH_ELYTRA:
+                    startingToGlide = true;
+                    break;
+                case OPEN_HORSE_INVENTORY:
+                    openingInventory = true;
+                    break;
+                case START_JUMPING_WITH_HORSE:
+                case STOP_JUMPING_WITH_HORSE:
+                    jumpingWithMount = true;
+                    break;
+            }
+        }
+
+        if (packetType == PacketType.Play.Client.USE_ITEM) {
+            using = true;
+        }
+
+        if (packetType == PacketType.Play.Client.PLAYER_BLOCK_PLACEMENT) {
+            if (new WrapperPlayClientPlayerBlockPlacement(event).getFace() == BlockFace.OTHER) {
+                using = true;
+            } else {
+                placing = true;
+            }
+        }
+
+        if (packetType == PacketType.Play.Client.PICK_ITEM) {
+            picking = true;
+        }
+
+        if (packetType == PacketType.Play.Client.CLICK_WINDOW) {
+            clickingInInventory = true;
+
+            switch (new WrapperPlayClientClickWindow(event).getWindowClickType()) {
+                case QUICK_MOVE:
+                    quickMoveClicking = true;
+                    break;
+                case PICKUP:
+                case PICKUP_ALL:
+                    pickUpClicking = true;
+                    break;
+            }
+        }
+
+        if (packetType == PacketType.Play.Client.CLOSE_WINDOW) {
+            closingInventory = true;
+        }
+
+        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType()) && player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8) && !player.packetStateData.lastPacketWasTeleport) {
+            onTick();
+        }
+    }
+
+    @Override
+    public void onPredictionComplete(PredictionComplete predictionComplete) {
+        if (player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_9)) {
+            onTick();
+        }
+    }
+
+    private void onTick() {
+        openingInventory = false;
+        swapping = false;
+        dropping = false;
+        attacking = false;
+        interacting = false;
+        releasing = false;
+        digging = false;
+        placing = false;
+        using = false;
+        picking = false;
+        sprinting = false;
+        sneaking = false;
+        clickingInInventory = false;
+        closingInventory = false;
+        quickMoveClicking = false;
+        pickUpClicking = false;
+        leavingBed = false;
+        startingToGlide = false;
+        jumpingWithMount = false;
+    }
+
+    @Contract(pure = true)
+    public boolean isRightClicking() {
+        return placing || using || interacting;
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/post/Post.java

@@ -2,7 +2,6 @@ package ac.grim.grimac.checks.impl.post;
 
 import ac.grim.grimac.checks.Check;
 import ac.grim.grimac.checks.CheckData;
-import ac.grim.grimac.checks.type.PacketCheck;
 import ac.grim.grimac.checks.type.PostPredictionCheck;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
@@ -25,7 +24,7 @@ import java.util.Locale;
 import static com.github.retrooper.packetevents.protocol.packettype.PacketType.Play.Client.*;
 
 @CheckData(name = "Post")
-public class PostCheck extends Check implements PacketCheck, PostPredictionCheck {
+public class Post extends Check implements PostPredictionCheck {
     private final ArrayDeque<PacketTypeCommon> post = new ArrayDeque<>();
     // Due to 1.9+ missing the idle packet, we must queue flags
     // 1.8 clients will have the same logic for simplicity, although it's not needed
@@ -33,7 +32,7 @@ public class PostCheck extends Check implements PacketCheck, PostPredictionCheck
     private boolean sentFlying = false;
     private int isExemptFromSwingingCheck = Integer.MIN_VALUE;
 
-    public PostCheck(GrimPlayer playerData) {
+    public Post(GrimPlayer playerData) {
         super(playerData);
     }
 
@@ -43,7 +42,7 @@ public class PostCheck extends Check implements PacketCheck, PostPredictionCheck
             // Okay, the user might be cheating, let's double check
             // 1.8 clients have the idle packet, and this shouldn't false on 1.8 clients
             // 1.9+ clients have predictions, which will determine if hidden tick skipping occurred
-            if (player.isTickingReliablyFor(3) && !player.uncertaintyHandler.lastVehicleSwitch.hasOccurredSince(0)) {
+            if (player.isTickingReliablyFor(3)) {
                 for (String flag : flags) {
                     flagAndAlert(flag);
                 }

src/main/java/ac/grim/grimac/checks/impl/prediction/DebugHandler.java

@@ -9,7 +9,7 @@ import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
 import ac.grim.grimac.utils.lists.EvictingQueue;
 import org.bukkit.ChatColor;
 import org.bukkit.entity.Player;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.HashSet;
 import java.util.Set;
@@ -45,8 +45,8 @@ public class DebugHandler extends Check implements PostPredictionCheck {
 
         ChatColor color = pickColor(offset, offset);
 
-        Vector predicted = player.predictedVelocity.vector;
-        Vector actually = player.actualMovement;
+        Vector3D predicted = player.predictedVelocity.vector;
+        Vector3D actually = player.actualMovement;
 
         ChatColor xColor = pickColor(Math.abs(predicted.getX() - actually.getX()), offset);
         ChatColor yColor = pickColor(Math.abs(predicted.getY() - actually.getY()), offset);

src/main/java/ac/grim/grimac/checks/impl/scaffolding/FarPlace.java

@@ -9,7 +9,9 @@ import ac.grim.grimac.utils.math.VectorUtils;
 import com.github.retrooper.packetevents.protocol.attribute.Attributes;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
 import com.github.retrooper.packetevents.util.Vector3i;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
+
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
 
 @CheckData(name = "FarPlace")
 public class FarPlace extends BlockPlaceCheck {
@@ -27,8 +29,8 @@ public class FarPlace extends BlockPlaceCheck {
         final double[] possibleEyeHeights = player.getPossibleEyeHeights();
         for (double d : possibleEyeHeights) {
             SimpleCollisionBox box = new SimpleCollisionBox(blockPos);
-            Vector eyes = new Vector(player.x, player.y + d, player.z);
-            Vector best = VectorUtils.cutBoxToVector(eyes, box);
+            Vector3D eyes = newVector3D(player.x, player.y + d, player.z);
+            Vector3D best = VectorUtils.cutBoxToVector(eyes, box);
             min = Math.min(min, eyes.distanceSquared(best));
         }
 

src/main/java/ac/grim/grimac/checks/impl/scaffolding/LineOfSightPlace.java

@@ -0,0 +1,224 @@
+package ac.grim.grimac.checks.impl.scaffolding;
+
+import ac.grim.grimac.api.config.ConfigManager;
+import ac.grim.grimac.checks.CheckData;
+import ac.grim.grimac.checks.type.BlockPlaceCheck;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.anticheat.update.BlockPlace;
+import ac.grim.grimac.utils.collisions.datatypes.SimpleCollisionBox;
+import ac.grim.grimac.utils.data.HitData;
+import ac.grim.grimac.utils.nmsutil.BlockRayTrace;
+import com.github.retrooper.packetevents.protocol.attribute.Attributes;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.player.GameMode;
+import com.github.retrooper.packetevents.protocol.world.BlockFace;
+import com.github.retrooper.packetevents.protocol.world.states.WrappedBlockState;
+import com.github.retrooper.packetevents.protocol.world.states.type.StateType;
+import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
+import com.github.retrooper.packetevents.util.Vector3d;
+import com.github.retrooper.packetevents.util.Vector3i;
+
+import java.util.HashSet;
+import java.util.List;
+import java.util.concurrent.ConcurrentHashMap;
+
+@CheckData(name = "LineOfSightPlace")
+public class LineOfSightPlace extends BlockPlaceCheck {
+
+    private double flagBuffer = 0; // If the player flags once, force them to play legit, or we will cancel the tick before.
+    private boolean ignorePost = false;
+    private boolean useBlockWhitelist;
+    private HashSet<StateType> blockWhitelist;
+
+    // 15 is the maximum set of Collision boxes that will be used in the ray trace check
+    // it corresponds to the size of the collision boxes from the modern Cauldron
+    // Since this is used per-player we can avoid calling new[] by allocating it per-player in the check
+    private final SimpleCollisionBox[] collisionBoxBuffer = new SimpleCollisionBox[15];
+
+    public final ConcurrentHashMap<Vector3i, WrappedBlockState> blocksChangedList = new ConcurrentHashMap<>();
+
+    public LineOfSightPlace(GrimPlayer player) {
+        super(player);
+    }
+
+    @Override
+    public void onBlockPlace(final BlockPlace place) {
+        if (checkIfShouldSkip(place)) return;
+
+//        if (flagBuffer > 0 && !didRayTraceHit(place)) {
+//            ignorePost = true;
+//            // If the player hit and has flagged this check recently
+//            if (flagAndAlert("pre-flying: " + player.compensatedWorld.getWrappedBlockStateAt(place.getPlacedAgainstBlockLocation()).getType()) && shouldModifyPackets() && shouldCancel()) {
+//                place.resync();  // Deny the block placement.
+//            }
+//        }
+        // Only flag (which will only happen in post) if we miss pre
+        if (didRayTraceHit(place)) {
+            ignorePost = true;
+        } else if (flagBuffer > 0) {
+            if (flagAndAlert("pre-flying: " + player.compensatedWorld.getWrappedBlockStateAt(place.getPlacedAgainstBlockLocation()).getType()) && shouldModifyPackets() && shouldCancel()) {
+                place.resync();  // Deny the block placement.
+            }
+        }
+    }
+
+    // Use post flying because it has the correct rotation, and can't false easily.
+    @Override
+    public void onPostFlyingBlockPlace(BlockPlace place) {
+        if (checkIfShouldSkip(place)) return;
+
+        // Don't flag twice
+        if (ignorePost) {
+            ignorePost = false;
+            return;
+        }
+        blocksChangedList.clear();
+        // Ray trace to try and hit the target block.
+        boolean hit = didRayTraceHit(place);
+        // This can false with rapidly moving yaw in 1.8+ clients
+        if (!hit) {
+            flagBuffer = 1;
+            flagAndAlert("post-flying: " + player.compensatedWorld.getWrappedBlockStateAt(place.getPlacedAgainstBlockLocation()).getType());
+        }
+        else {
+            flagBuffer = Math.max(0, flagBuffer - 0.1);
+        }
+    }
+
+    private boolean checkIfShouldSkip(BlockPlace place) {
+        StateType targetBlockStateType = player.compensatedWorld.getWrappedBlockStateAt(place.getPlacedAgainstBlockLocation()).getType();
+        if (player.gamemode == GameMode.SPECTATOR) return true; // A waste to check creative mode players
+        if (targetBlockStateType == StateTypes.REDSTONE_WIRE) return true; // Redstone too buggy
+        if (player.compensatedWorld.isNearHardEntity(player.boundingBox.copy().expand(4))) return true; // Shulkers and Pistons are too buggy
+
+        if (useBlockWhitelist) {
+            return !isBlockTypeWhitelisted(targetBlockStateType);
+        }
+        return false;
+    }
+
+    public void handleBlockChange(Vector3i vector3i, WrappedBlockState state) {
+        if (blocksChangedList.size() >= 60) return; // Don't let players freeze movement packets to grow this
+        // Only do this for nearby blocks
+        if (new Vector3d(vector3i.x, vector3i.y, vector3i.z).distanceSquared(new Vector3d(player.x, player.y, player.z)) > 36) return;
+        // Only do this if the state really had any world impact
+        // this line always just returns the current world state in compensatedWorld
+//        if (state.equals(player.compensatedWorld.getWrappedBlockStateAt(vector3i))) return;
+        blocksChangedList.put(vector3i, state);
+    }
+
+    private boolean didRayTraceHit(BlockPlace place) {
+        double[] possibleEyeHeights = player.getPossibleEyeHeights();
+
+        // Start checking if player is in the block
+        double minEyeHeight = Double.MAX_VALUE;
+        double maxEyeHeight = Double.MIN_VALUE;
+        for (double height : possibleEyeHeights) {
+            minEyeHeight = Math.min(minEyeHeight, height);
+            maxEyeHeight = Math.max(maxEyeHeight, height);
+        }
+
+        double movementThreshold = player.getMovementThreshold();
+
+        SimpleCollisionBox eyePositions = new SimpleCollisionBox(player.x, player.y + minEyeHeight, player.z, player.x, player.y + maxEyeHeight, player.z);
+        eyePositions.expand(movementThreshold);
+
+        int[] interactBlockVec = new int[]{place.blockPosition.x, place.blockPosition.y, place.blockPosition.z};
+        BlockFace expectedBlockFace = place.getDirection();
+
+        // If the player is inside a block, then they can ray trace through the block and hit the other side of the block
+        // This may potentially be exploitable as a minor bypass
+        if (eyePositions.isIntersected(new SimpleCollisionBox(interactBlockVec[0], interactBlockVec[1], interactBlockVec[2]))) {
+            return true;
+        }
+        // End checking if the player is in the block
+        double[][] possibleLookDirs;
+        // 1.9+ players could be a tick behind because we don't get skipped ticks
+        if (player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_9)) {
+            possibleLookDirs = new double[][]{
+                    {player.xRot, player.yRot},
+                    {player.lastXRot, player.lastYRot},
+                    {player.lastXRot, player.yRot}
+            };
+        } else if (player.getClientVersion().isOlderThan(ClientVersion.V_1_8)) {
+            // 1.7 players do not have any of these issues! They are always on the latest look vector
+            possibleLookDirs = new double[][]{{player.xRot, player.yRot}};
+        } else {
+            possibleLookDirs = new double[][]{
+                    {player.xRot, player.yRot},
+                    {player.lastXRot, player.yRot}
+            };
+        }
+
+        // We do not need to add 0.03/0.0002 to maxDistance to ensure our raytrace hits blocks
+        // Since we expand the hitboxes of the expectedTargetBlock by 0.03/0.002 already later
+        double maxDistance = player.compensatedEntities.getSelf().getAttributeValue(Attributes.PLAYER_BLOCK_INTERACTION_RANGE);
+
+        // Define possible offsets
+        // TODO, vectorize this with SIMD or AVX for performance
+        double[][] offsets = {
+                {0, 0, 0},
+                {movementThreshold, 0, 0},
+                {-movementThreshold, 0, 0},
+                {0, movementThreshold, 0},
+                {0, -movementThreshold, 0},
+                {0, 0, movementThreshold},
+                {0, 0, -movementThreshold}
+        };
+
+        double[] eyePosition = new double[3];
+        double[] eyeLookDir = new double[3];
+
+        for (double eyeHeight : possibleEyeHeights) {
+            for (double[] lookDir : possibleLookDirs) {
+                for (double[] offset : offsets) {
+                    eyePosition[0] = player.x + offset[0];
+                    eyePosition[1] = player.y + eyeHeight + offset[1];
+                    eyePosition[2] = player.z + offset[2];
+
+                    calculateDirection(eyeLookDir, lookDir[0], lookDir[1]);
+
+                    if (didRayTraceHitTargetBlock(eyePosition, eyeLookDir, maxDistance, interactBlockVec, expectedBlockFace)) {
+                        return true; // If any possible face matches the client-side placement, assume it's legitimate
+                    }
+                }
+            }
+        }
+
+        return false; // No matching face found
+    }
+
+    // Helper method to calculate direction (replace the Ray class method)
+    private void calculateDirection(double[] result, double xRot, double yRot) {
+        float rotX = (float) Math.toRadians(xRot);
+        float rotY = (float) Math.toRadians(yRot);
+        result[1] = -player.trigHandler.sin(rotY);
+        double xz = player.trigHandler.cos(rotY);
+        result[0] = -xz * player.trigHandler.sin(rotX);
+        result[2] = xz * player.trigHandler.cos(rotX);
+    }
+
+    private boolean didRayTraceHitTargetBlock(double[] eyePos, double[] eyeDir, double maxDistance, int[] targetBlockVec, BlockFace expectedBlockFace) {
+        HitData hitData = BlockRayTrace.getNearestReachHitResult(player, eyePos, eyeDir, maxDistance, maxDistance, targetBlockVec, expectedBlockFace, collisionBoxBuffer, null, false);
+         if (hitData == null || !hitData.success)
+            hitData = BlockRayTrace.getNearestReachHitResult(player, eyePos, eyeDir, maxDistance, maxDistance, targetBlockVec,
+                expectedBlockFace, collisionBoxBuffer, player.checkManager.getBlockPlaceCheck(LineOfSightPlace.class).blocksChangedList, false);
+
+        // we check for hitdata != null because of being in expanded hitbox, or there was no result, do we still need this?
+        return hitData != null && hitData.success;
+    }
+
+    private boolean isBlockTypeWhitelisted(StateType type) {
+        return blockWhitelist.contains(type);
+    }
+
+    @Override
+    public void onReload(ConfigManager config) {
+        useBlockWhitelist = config.getBooleanElse("LineOfSightPlace.use-block-whitelist", false);
+        blockWhitelist = new HashSet<>();
+        List<String> blocks = config.getStringList("LineOfSightPlace.block-whitelist");
+        for (String block : blocks) {
+            blockWhitelist.add(StateTypes.getByName(block));
+        }
+    }
+}

src/main/java/ac/grim/grimac/checks/impl/scaffolding/MultiPlace.java

@@ -63,7 +63,7 @@ public class MultiPlace extends BlockPlaceCheck {
 
     @Override
     public void onPredictionComplete(PredictionComplete predictionComplete) {
-        if (player.getClientVersion().isNewerThan(ClientVersion.V_1_8) && player.isTickingReliablyFor(3) && !player.uncertaintyHandler.lastVehicleSwitch.hasOccurredSince(0)) {
+        if (player.getClientVersion().isNewerThan(ClientVersion.V_1_8) && player.isTickingReliablyFor(3)) {
             for (String verbose : flags) {
                 flagAndAlert(verbose);
             }

src/main/java/ac/grim/grimac/checks/impl/scaffolding/PositionPlace.java

@@ -48,21 +48,27 @@ public class PositionPlace extends BlockPlaceCheck {
 
         // So now we have the player's possible eye positions
         // So then look at the face that the player has clicked
-        boolean flag = switch (place.getDirection()) {
-            case NORTH -> // Z- face
-                    eyePositions.minZ > combined.minZ;
-            case SOUTH -> // Z+ face
-                    eyePositions.maxZ < combined.maxZ;
-            case EAST -> // X+ face
-                    eyePositions.maxX < combined.maxX;
-            case WEST -> // X- face
-                    eyePositions.minX > combined.minX;
-            case UP -> // Y+ face
-                    eyePositions.maxY < combined.maxY;
-            case DOWN -> // Y- face
-                    eyePositions.minY > combined.minY;
-            default -> false;
-        };
+        boolean flag = false;
+        switch (place.getDirection()) {
+            case NORTH: // Z- face
+                flag = eyePositions.minZ > combined.minZ;
+                break;
+            case SOUTH: // Z+ face
+                flag = eyePositions.maxZ < combined.maxZ;
+                break;
+            case EAST: // X+ face
+                flag = eyePositions.maxX < combined.maxX;
+                break;
+            case WEST: // X- face
+                flag = eyePositions.minX > combined.minX;
+                break;
+            case UP: // Y+ face
+                flag = eyePositions.maxY < combined.maxY;
+                break;
+            case DOWN: // Y- face
+                flag = eyePositions.minY > combined.minY;
+                break;
+        }
 
         if (flag) {
             if (flagAndAlert() && shouldModifyPackets() && shouldCancel()) {

src/main/java/ac/grim/grimac/checks/impl/scaffolding/RotationPlace.java

@@ -1,122 +1 @@
-package ac.grim.grimac.checks.impl.scaffolding;
 
-import ac.grim.grimac.checks.CheckData;
-import ac.grim.grimac.checks.type.BlockPlaceCheck;
-import ac.grim.grimac.player.GrimPlayer;
-import ac.grim.grimac.utils.anticheat.update.BlockPlace;
-import ac.grim.grimac.utils.collisions.datatypes.SimpleCollisionBox;
-import ac.grim.grimac.utils.data.Pair;
-import ac.grim.grimac.utils.nmsutil.Ray;
-import ac.grim.grimac.utils.nmsutil.ReachUtils;
-import com.github.retrooper.packetevents.protocol.attribute.Attributes;
-import com.github.retrooper.packetevents.protocol.player.ClientVersion;
-import com.github.retrooper.packetevents.protocol.player.GameMode;
-import com.github.retrooper.packetevents.protocol.world.BlockFace;
-import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
-import com.github.retrooper.packetevents.util.Vector3d;
-import com.github.retrooper.packetevents.util.Vector3f;
-import org.bukkit.util.Vector;
-
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-
-@CheckData(name = "RotationPlace")
-public class RotationPlace extends BlockPlaceCheck {
-    double flagBuffer = 0; // If the player flags once, force them to play legit, or we will cancel the tick before.
-    boolean ignorePost = false;
-
-    public RotationPlace(GrimPlayer player) {
-        super(player);
-    }
-
-    @Override
-    public void onBlockPlace(final BlockPlace place) {
-        if (place.getMaterial() == StateTypes.SCAFFOLDING) return;
-        if (player.gamemode == GameMode.SPECTATOR) return; // you don't send flying packets when spectating entities
-        if (flagBuffer > 0 && !didRayTraceHit(place)) {
-            ignorePost = true;
-            // If the player hit and has flagged this check recently
-            if (flagAndAlert("pre-flying") && shouldModifyPackets() && shouldCancel()) {
-                place.resync();  // Deny the block placement.
-            }
-        }
-    }
-
-    // Use post flying because it has the correct rotation, and can't false easily.
-    @Override
-    public void onPostFlyingBlockPlace(BlockPlace place) {
-        if (place.getMaterial() == StateTypes.SCAFFOLDING) return;
-        if (player.gamemode == GameMode.SPECTATOR) return; // you don't send flying packets when spectating entities
-
-        // Don't flag twice
-        if (ignorePost) {
-            ignorePost = false;
-            return;
-        }
-
-        // Ray trace to try and hit the target block.
-        boolean hit = didRayTraceHit(place);
-        // This can false with rapidly moving yaw in 1.8+ clients
-        if (!hit) {
-            flagBuffer = 1;
-            flagAndAlert("post-flying");
-        } else {
-            flagBuffer = Math.max(0, flagBuffer - 0.1);
-        }
-    }
-
-    private boolean didRayTraceHit(BlockPlace place) {
-        SimpleCollisionBox box = new SimpleCollisionBox(place.getPlacedAgainstBlockLocation());
-
-        List<Vector3f> possibleLookDirs = new ArrayList<>(Arrays.asList(
-                new Vector3f(player.xRot, player.yRot, 0),
-                new Vector3f(player.lastXRot, player.yRot, 0)
-        ));
-
-        final double[] possibleEyeHeights = player.getPossibleEyeHeights();
-
-        // Start checking if player is in the block
-        double minEyeHeight = Double.MAX_VALUE;
-        double maxEyeHeight = Double.MIN_VALUE;
-        for (double height : possibleEyeHeights) {
-            minEyeHeight = Math.min(minEyeHeight, height);
-            maxEyeHeight = Math.max(maxEyeHeight, height);
-        }
-
-        SimpleCollisionBox eyePositions = new SimpleCollisionBox(player.x, player.y + minEyeHeight, player.z, player.x, player.y + maxEyeHeight, player.z);
-        eyePositions.expand(player.getMovementThreshold());
-
-        // If the player is inside a block, then they can ray trace through the block and hit the other side of the block
-        if (eyePositions.isIntersected(box)) {
-            return true;
-        }
-        // End checking if the player is in the block
-
-        // 1.9+ players could be a tick behind because we don't get skipped ticks
-        if (player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_9)) {
-            possibleLookDirs.add(new Vector3f(player.lastXRot, player.lastYRot, 0));
-        }
-
-        // 1.7 players do not have any of these issues! They are always on the latest look vector
-        if (player.getClientVersion().isOlderThan(ClientVersion.V_1_8)) {
-            possibleLookDirs = Collections.singletonList(new Vector3f(player.xRot, player.yRot, 0));
-        }
-
-        final double distance = player.compensatedEntities.getSelf().getAttributeValue(Attributes.PLAYER_BLOCK_INTERACTION_RANGE);
-        for (double d : possibleEyeHeights) {
-            for (Vector3f lookDir : possibleLookDirs) {
-                // x, y, z are correct for the block placement even after post tick because of code elsewhere
-                Vector3d starting = new Vector3d(player.x, player.y + d, player.z);
-                // xRot and yRot are a tick behind
-                Ray trace = new Ray(player, starting.getX(), starting.getY(), starting.getZ(), lookDir.getX(), lookDir.getY());
-                Pair<Vector, BlockFace> intercept = ReachUtils.calculateIntercept(box, trace.getOrigin(), trace.getPointAtDistance(distance));
-
-                if (intercept.first() != null) return true;
-            }
-        }
-
-        return false;
-    }
-}

src/main/java/ac/grim/grimac/checks/impl/velocity/ExplosionHandler.java

@@ -19,12 +19,14 @@ import com.github.retrooper.packetevents.util.Vector3f;
 import com.github.retrooper.packetevents.util.Vector3i;
 import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerExplosion;
 import lombok.Getter;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.Deque;
 import java.util.LinkedList;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 @CheckData(name = "AntiExplosion", configName = "Explosion", setback = 10)
 public class ExplosionHandler extends Check implements PostPredictionCheck {
     Deque<VelocityData> firstBreadMap = new LinkedList<>();
@@ -121,7 +123,7 @@ public class ExplosionHandler extends Check implements PostPredictionCheck {
     }
 
     public void addPlayerExplosion(int breadOne, Vector3f explosion) {
-        firstBreadMap.add(new VelocityData(-1, breadOne, player.getSetbackTeleportUtil().isSendingSetback, new Vector(explosion.getX(), explosion.getY(), explosion.getZ())));
+        firstBreadMap.add(new VelocityData(-1, breadOne, player.getSetbackTeleportUtil().isSendingSetback, newVector3D(explosion.getX(), explosion.getY(), explosion.getZ())));
     }
 
     public void setPointThree(boolean isPointThree) {

src/main/java/ac/grim/grimac/checks/impl/velocity/KnockbackHandler.java

@@ -15,12 +15,14 @@ import com.github.retrooper.packetevents.protocol.packettype.PacketType;
 import com.github.retrooper.packetevents.util.Vector3d;
 import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerEntityVelocity;
 import lombok.Getter;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.Deque;
 import java.util.LinkedList;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 // We are making a velocity sandwich between two pieces of transaction packets (bread)
 @CheckData(name = "AntiKB", alternativeName = "AntiKnockback", configName = "Knockback", setback = 10, decay = 0.025)
 public class KnockbackHandler extends Check implements PostPredictionCheck {
@@ -70,12 +72,12 @@ public class KnockbackHandler extends Check implements PostPredictionCheck {
 
             // Wrap velocity between two transactions
             player.sendTransaction();
-            addPlayerKnockback(entityId, player.lastTransactionSent.get(), new Vector(playerVelocity.getX(), playerVelocity.getY(), playerVelocity.getZ()));
+            addPlayerKnockback(entityId, player.lastTransactionSent.get(), newVector3D(playerVelocity.getX(), playerVelocity.getY(), playerVelocity.getZ()));
             event.getTasksAfterSend().add(player::sendTransaction);
         }
     }
 
-    @NotNull public Pair<VelocityData, Vector> getFutureKnockback() {
+    @NotNull public Pair<VelocityData, Vector3D> getFutureKnockback() {
         // Chronologically in the future
         if (firstBreadMap.size() > 0) {
             VelocityData data = firstBreadMap.peek();
@@ -97,7 +99,7 @@ public class KnockbackHandler extends Check implements PostPredictionCheck {
         return new Pair<>(null, null);
     }
 
-    private void addPlayerKnockback(int entityID, int breadOne, Vector knockback) {
+    private void addPlayerKnockback(int entityID, int breadOne, Vector3D knockback) {
         firstBreadMap.add(new VelocityData(entityID, breadOne, player.getSetbackTeleportUtil().isSendingSetback, knockback));
     }
 

src/main/java/ac/grim/grimac/checks/type/InventoryCheck.java

@@ -0,0 +1,67 @@
+package ac.grim.grimac.checks.type;
+
+import ac.grim.grimac.player.GrimPlayer;
+import com.github.retrooper.packetevents.PacketEvents;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientCloseWindow;
+import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerCloseWindow;
+import org.jetbrains.annotations.MustBeInvokedByOverriders;
+
+public class InventoryCheck extends BlockPlaceCheck implements PacketCheck {
+    // Impossible transaction ID
+    protected static final long NONE = Long.MAX_VALUE;
+
+    protected long closeTransaction = NONE;
+    protected int closePacketsToSkip;
+
+    public InventoryCheck(GrimPlayer player) {
+        super(player);
+    }
+
+    @Override
+    @MustBeInvokedByOverriders
+    public void onPacketReceive(final PacketReceiveEvent event) {
+        if (event.getPacketType() == PacketType.Play.Client.CLICK_WINDOW) {
+            // Disallow any clicks if inventory is closing
+            if (closeTransaction != NONE && shouldModifyPackets()) {
+                event.setCancelled(true);
+                player.onPacketCancel();
+                player.getInventory().needResend = true;
+            }
+        } else if (event.getPacketType() == PacketType.Play.Client.CLOSE_WINDOW) {
+            // Players with high ping can close inventory faster than send transaction back
+            if (closeTransaction != NONE && closePacketsToSkip-- <= 0) {
+                closeTransaction = NONE;
+            }
+        }
+    }
+
+    public void closeInventory() {
+        if (closeTransaction != NONE) {
+            return;
+        }
+
+        int windowId = player.getInventory().openWindowID;
+
+        player.user.writePacket(new WrapperPlayServerCloseWindow(windowId));
+
+        // Force close inventory on server side
+        closePacketsToSkip = 1; // Sending close packet to itself, so skip it
+        PacketEvents.getAPI().getProtocolManager().receivePacket(
+                player.user.getChannel(), new WrapperPlayClientCloseWindow(windowId)
+        );
+
+        player.sendTransaction();
+
+        int transaction = player.lastTransactionSent.get();
+        closeTransaction = transaction;
+        player.latencyUtils.addRealTimeTask(transaction, () -> {
+            if (closeTransaction == transaction) {
+                closeTransaction = NONE;
+            }
+        });
+
+        player.user.flushPackets();
+    }
+}

src/main/java/ac/grim/grimac/commands/GrimSpectate.java

@@ -23,7 +23,8 @@ public class GrimSpectate extends BaseCommand {
     @CommandPermission("grim.spectate")
     @CommandCompletion("@players")
     public void onSpectate(CommandSender sender, @Optional OnlinePlayer target) {
-        if (!(sender instanceof Player player)) return;
+        if (!(sender instanceof Player)) return;
+        Player player = (Player) sender;
 
         if (target != null && target.getPlayer().getUniqueId().equals(player.getUniqueId())) {
             String message = GrimAPI.INSTANCE.getConfigManager().getConfig().getStringElse("cannot-run-on-self", "%prefix% &cYou cannot use this command on yourself!");

src/main/java/ac/grim/grimac/commands/GrimStopSpectating.java

@@ -3,8 +3,6 @@ package ac.grim.grimac.commands;
 import ac.grim.grimac.GrimAPI;
 import ac.grim.grimac.utils.anticheat.MessageUtil;
 import co.aikar.commands.BaseCommand;
-import co.aikar.commands.BukkitCommandCompletionContext;
-import co.aikar.commands.CommandCompletions.CommandCompletionHandler;
 import co.aikar.commands.annotation.CommandAlias;
 import co.aikar.commands.annotation.CommandCompletion;
 import co.aikar.commands.annotation.CommandPermission;
@@ -12,21 +10,17 @@ import co.aikar.commands.annotation.Subcommand;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 
-import java.util.List;
-
 @CommandAlias("grim|grimac")
 public class GrimStopSpectating extends BaseCommand {
-    public static final CommandCompletionHandler<BukkitCommandCompletionContext> completionHandler = context -> context.getSender().hasPermission("grim.spectate.stophere") ? List.of("here") : List.of();
-
     @Subcommand("stopspectating")
     @CommandPermission("grim.spectate")
-    @CommandCompletion("@stopspectating")
+    @CommandCompletion("here")
     public void onStopSpectate(CommandSender sender, String[] args) {
         String string = args.length > 0 ? args[0] : null;
         if (!(sender instanceof Player)) return;
         Player player = (Player) sender;
         if (GrimAPI.INSTANCE.getSpectateManager().isSpectating(player.getUniqueId())) {
-            boolean teleportBack = string == null || !string.equalsIgnoreCase("here") || !sender.hasPermission("grim.spectate.stophere");
+            boolean teleportBack = string == null || !string.equalsIgnoreCase("here");
             GrimAPI.INSTANCE.getSpectateManager().disable(player, teleportBack);
         } else {
             String message = GrimAPI.INSTANCE.getConfigManager().getConfig().getStringElse("cannot-spectate-return", "%prefix% &cYou can only do this after spectating a player.");

src/main/java/ac/grim/grimac/events/packets/CheckManagerListener.java

@@ -3,18 +3,15 @@ package ac.grim.grimac.events.packets;
 import ac.grim.grimac.GrimAPI;
 import ac.grim.grimac.checks.impl.badpackets.BadPacketsX;
 import ac.grim.grimac.checks.impl.badpackets.BadPacketsZ;
+import ac.grim.grimac.checks.impl.inventory.InventoryB;
 import ac.grim.grimac.events.packets.patch.ResyncWorldUtil;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.utils.anticheat.update.*;
 import ac.grim.grimac.utils.blockplace.BlockPlaceResult;
 import ac.grim.grimac.utils.blockplace.ConsumesBlockPlace;
-import ac.grim.grimac.utils.collisions.HitboxData;
-import ac.grim.grimac.utils.collisions.datatypes.CollisionBox;
-import ac.grim.grimac.utils.collisions.datatypes.SimpleCollisionBox;
 import ac.grim.grimac.utils.data.*;
 import ac.grim.grimac.utils.inventory.Inventory;
 import ac.grim.grimac.utils.latency.CompensatedWorld;
-import ac.grim.grimac.utils.math.GrimMath;
 import ac.grim.grimac.utils.math.VectorUtils;
 import ac.grim.grimac.utils.nmsutil.*;
 import com.github.retrooper.packetevents.PacketEvents;
@@ -24,7 +21,6 @@ import com.github.retrooper.packetevents.event.PacketReceiveEvent;
 import com.github.retrooper.packetevents.event.PacketSendEvent;
 import com.github.retrooper.packetevents.manager.server.ServerVersion;
 import com.github.retrooper.packetevents.protocol.ConnectionState;
-import com.github.retrooper.packetevents.protocol.attribute.Attributes;
 import com.github.retrooper.packetevents.protocol.item.ItemStack;
 import com.github.retrooper.packetevents.protocol.item.type.ItemType;
 import com.github.retrooper.packetevents.protocol.item.type.ItemTypes;
@@ -47,11 +43,7 @@ import com.github.retrooper.packetevents.wrapper.play.client.*;
 import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerAcknowledgeBlockChanges;
 import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerSetSlot;
 import io.github.retrooper.packetevents.util.SpigotConversionUtil;
-import org.bukkit.util.Vector;
 
-import java.util.ArrayList;
-import java.util.List;
-import java.util.function.BiFunction;
 import java.util.function.Function;
 
 public class CheckManagerListener extends PacketListenerAbstract {
@@ -60,79 +52,8 @@ public class CheckManagerListener extends PacketListenerAbstract {
         super(PacketListenerPriority.LOW);
     }
 
-    // Copied from MCP...
-    // Returns null if there isn't anything.
-    //
-    // I do have to admit that I'm starting to like bifunctions/new java 8 things more than I originally did.
-    // although I still don't understand Mojang's obsession with streams in some of the hottest methods... that kills performance
-    public static HitData traverseBlocks(GrimPlayer player, Vector3d start, Vector3d end, BiFunction<WrappedBlockState, Vector3i, HitData> predicate) {
-        // I guess go back by the collision epsilon?
-        double endX = GrimMath.lerp(-1.0E-7D, end.x, start.x);
-        double endY = GrimMath.lerp(-1.0E-7D, end.y, start.y);
-        double endZ = GrimMath.lerp(-1.0E-7D, end.z, start.z);
-        double startX = GrimMath.lerp(-1.0E-7D, start.x, end.x);
-        double startY = GrimMath.lerp(-1.0E-7D, start.y, end.y);
-        double startZ = GrimMath.lerp(-1.0E-7D, start.z, end.z);
-        int floorStartX = GrimMath.floor(startX);
-        int floorStartY = GrimMath.floor(startY);
-        int floorStartZ = GrimMath.floor(startZ);
-
-
-        if (start.equals(end)) return null;
-
-        WrappedBlockState state = player.compensatedWorld.getWrappedBlockStateAt(floorStartX, floorStartY, floorStartZ);
-        HitData apply = predicate.apply(state, new Vector3i(floorStartX, floorStartY, floorStartZ));
-
-        if (apply != null) {
-            return apply;
-        }
-
-        double xDiff = endX - startX;
-        double yDiff = endY - startY;
-        double zDiff = endZ - startZ;
-        double xSign = Math.signum(xDiff);
-        double ySign = Math.signum(yDiff);
-        double zSign = Math.signum(zDiff);
-
-        double posXInverse = xSign == 0 ? Double.MAX_VALUE : xSign / xDiff;
-        double posYInverse = ySign == 0 ? Double.MAX_VALUE : ySign / yDiff;
-        double posZInverse = zSign == 0 ? Double.MAX_VALUE : zSign / zDiff;
-
-        double d12 = posXInverse * (xSign > 0 ? 1.0D - GrimMath.frac(startX) : GrimMath.frac(startX));
-        double d13 = posYInverse * (ySign > 0 ? 1.0D - GrimMath.frac(startY) : GrimMath.frac(startY));
-        double d14 = posZInverse * (zSign > 0 ? 1.0D - GrimMath.frac(startZ) : GrimMath.frac(startZ));
-
-        // Can't figure out what this code does currently
-        while (d12 <= 1.0D || d13 <= 1.0D || d14 <= 1.0D) {
-            if (d12 < d13) {
-                if (d12 < d14) {
-                    floorStartX += xSign;
-                    d12 += posXInverse;
-                } else {
-                    floorStartZ += zSign;
-                    d14 += posZInverse;
-                }
-            } else if (d13 < d14) {
-                floorStartY += ySign;
-                d13 += posYInverse;
-            } else {
-                floorStartZ += zSign;
-                d14 += posZInverse;
-            }
-
-            state = player.compensatedWorld.getWrappedBlockStateAt(floorStartX, floorStartY, floorStartZ);
-            apply = predicate.apply(state, new Vector3i(floorStartX, floorStartY, floorStartZ));
-
-            if (apply != null) {
-                return apply;
-            }
-        }
-
-        return null;
-    }
-
     private static void placeWaterLavaSnowBucket(GrimPlayer player, ItemStack held, StateType toPlace, InteractionHand hand) {
-        HitData data = getNearestHitResult(player, StateTypes.AIR, false);
+        HitData data = BlockRayTrace.getNearestHitResult(player, StateTypes.AIR, false);
         if (data != null) {
             BlockPlace blockPlace = new BlockPlace(player, hand, data.getPosition(), data.getClosestDirection().getFaceValue(), data.getClosestDirection(), held, data);
 
@@ -227,8 +148,9 @@ public class CheckManagerListener extends PacketListenerAbstract {
 
     private static void handleBlockPlaceOrUseItem(PacketWrapper<?> packet, GrimPlayer player) {
         // Legacy "use item" packet
-        if (packet instanceof WrapperPlayClientPlayerBlockPlacement place &&
+        if (packet instanceof WrapperPlayClientPlayerBlockPlacement &&
                 PacketEvents.getAPI().getServerManager().getVersion().isOlderThan(ServerVersion.V_1_9)) {
+            WrapperPlayClientPlayerBlockPlacement place = (WrapperPlayClientPlayerBlockPlacement) packet;
 
             if (player.gamemode == GameMode.SPECTATOR || player.gamemode == GameMode.ADVENTURE) return;
 
@@ -243,7 +165,9 @@ public class CheckManagerListener extends PacketListenerAbstract {
             }
         }
 
-        if (packet instanceof WrapperPlayClientUseItem place) {
+        if (packet instanceof WrapperPlayClientUseItem) {
+            WrapperPlayClientUseItem place = (WrapperPlayClientUseItem) packet;
+
             if (player.gamemode == GameMode.SPECTATOR || player.gamemode == GameMode.ADVENTURE) return;
 
             ItemStack placedWith = player.getInventory().getHeldItem();
@@ -255,7 +179,9 @@ public class CheckManagerListener extends PacketListenerAbstract {
         }
 
         // Check for interactable first (door, etc)
-        if (packet instanceof WrapperPlayClientPlayerBlockPlacement place) {
+        if (packet instanceof WrapperPlayClientPlayerBlockPlacement) {
+            WrapperPlayClientPlayerBlockPlacement place = (WrapperPlayClientPlayerBlockPlacement) packet;
+
             ItemStack placedWith = player.getInventory().getHeldItem();
             ItemStack offhand = player.getInventory().getOffHand();
 
@@ -264,7 +190,7 @@ public class CheckManagerListener extends PacketListenerAbstract {
             // The offhand is unable to interact with blocks like this... try to stop some desync points before they happen
             if ((!player.isSneaking || onlyAir) && place.getHand() == InteractionHand.MAIN_HAND) {
                 Vector3i blockPosition = place.getBlockPosition();
-                BlockPlace blockPlace = new BlockPlace(player, place.getHand(), blockPosition, place.getFaceId(), place.getFace(), placedWith, getNearestHitResult(player, null, true));
+                BlockPlace blockPlace = new BlockPlace(player, place.getHand(), blockPosition, place.getFaceId(), place.getFace(), placedWith, BlockRayTrace.getNearestHitResult(player, null, true));
 
                 // Right-clicking a trapdoor/door/etc.
                 StateType placedAgainst = blockPlace.getPlacedAgainstMaterial();
@@ -291,7 +217,8 @@ public class CheckManagerListener extends PacketListenerAbstract {
             }
         }
 
-        if (packet instanceof WrapperPlayClientPlayerBlockPlacement place) {
+        if (packet instanceof WrapperPlayClientPlayerBlockPlacement) {
+            WrapperPlayClientPlayerBlockPlacement place = (WrapperPlayClientPlayerBlockPlacement) packet;
             Vector3i blockPosition = place.getBlockPosition();
             BlockFace face = place.getFace();
 
@@ -303,7 +230,7 @@ public class CheckManagerListener extends PacketListenerAbstract {
                 placedWith = player.getInventory().getOffHand();
             }
 
-            BlockPlace blockPlace = new BlockPlace(player, place.getHand(), blockPosition, place.getFaceId(), face, placedWith, getNearestHitResult(player, null, true));
+            BlockPlace blockPlace = new BlockPlace(player, place.getHand(), blockPosition, place.getFaceId(), face, placedWith, BlockRayTrace.getNearestHitResult(player, null, true));
             // At this point, it is too late to cancel, so we can only flag, and cancel subsequent block places more aggressively
             if (!player.compensatedEntities.getSelf().inVehicle()) {
                 player.checkManager.onPostFlyingBlockPlace(blockPlace);
@@ -460,6 +387,8 @@ public class CheckManagerListener extends PacketListenerAbstract {
             WrappedBlockState block = player.compensatedWorld.getWrappedBlockStateAt(digPosition);
             final StateType type = block.getType();
 
+            player.checkManager.getPacketCheck(InventoryB.class).handle(event, dig);
+
             player.checkManager.getPacketCheck(BadPacketsX.class).handle(event, dig, type);
             player.checkManager.getPacketCheck(BadPacketsZ.class).handle(event, dig);
 
@@ -510,7 +439,7 @@ public class CheckManagerListener extends PacketListenerAbstract {
                 player.placeUseItemPackets.add(new BlockPlaceSnapshot(packet, player.isSneaking));
             } else {
                 // Anti-air place
-                BlockPlace blockPlace = new BlockPlace(player, packet.getHand(), packet.getBlockPosition(), packet.getFaceId(), packet.getFace(), placedWith, getNearestHitResult(player, null, true));
+                BlockPlace blockPlace = new BlockPlace(player, packet.getHand(), packet.getBlockPosition(), packet.getFaceId(), packet.getFace(), placedWith, BlockRayTrace.getNearestHitResult(player, null, true));
                 blockPlace.setCursor(packet.getCursorPosition());
 
                 if (PacketEvents.getAPI().getServerManager().getVersion().isNewerThanOrEquals(ServerVersion.V_1_11) && player.getClientVersion().isOlderThan(ClientVersion.V_1_11)) {
@@ -584,7 +513,7 @@ public class CheckManagerListener extends PacketListenerAbstract {
     }
 
     private static void placeBucket(GrimPlayer player, InteractionHand hand) {
-        HitData data = getNearestHitResult(player, null, true);
+        HitData data = BlockRayTrace.getNearestHitResult(player, null, true);
 
         if (data != null) {
             BlockPlace blockPlace = new BlockPlace(player, hand, data.getPosition(), data.getClosestDirection().getFaceValue(), data.getClosestDirection(), ItemStack.EMPTY, data);
@@ -750,7 +679,7 @@ public class CheckManagerListener extends PacketListenerAbstract {
     }
 
     private static void placeLilypad(GrimPlayer player, InteractionHand hand) {
-        HitData data = getNearestHitResult(player, null, true);
+        HitData data = BlockRayTrace.getNearestHitResult(player, null, true);
 
         if (data != null) {
             // A lilypad cannot replace a fluid
@@ -780,56 +709,6 @@ public class CheckManagerListener extends PacketListenerAbstract {
         }
     }
 
-    private static HitData getNearestHitResult(GrimPlayer player, StateType heldItem, boolean sourcesHaveHitbox) {
-        Vector3d startingPos = new Vector3d(player.x, player.y + player.getEyeHeight(), player.z);
-        Vector startingVec = new Vector(startingPos.getX(), startingPos.getY(), startingPos.getZ());
-        Ray trace = new Ray(player, startingPos.getX(), startingPos.getY(), startingPos.getZ(), player.xRot, player.yRot);
-        final double distance = player.compensatedEntities.getSelf().getAttributeValue(Attributes.PLAYER_BLOCK_INTERACTION_RANGE);
-        Vector endVec = trace.getPointAtDistance(distance);
-        Vector3d endPos = new Vector3d(endVec.getX(), endVec.getY(), endVec.getZ());
-
-        return traverseBlocks(player, startingPos, endPos, (block, vector3i) -> {
-            CollisionBox data = HitboxData.getBlockHitbox(player, heldItem, player.getClientVersion(), block, vector3i.getX(), vector3i.getY(), vector3i.getZ());
-            List<SimpleCollisionBox> boxes = new ArrayList<>();
-            data.downCast(boxes);
-
-            double bestHitResult = Double.MAX_VALUE;
-            Vector bestHitLoc = null;
-            BlockFace bestFace = null;
-
-            for (SimpleCollisionBox box : boxes) {
-                Pair<Vector, BlockFace> intercept = ReachUtils.calculateIntercept(box, trace.getOrigin(), trace.getPointAtDistance(distance));
-                if (intercept.first() == null) continue; // No intercept
-
-                Vector hitLoc = intercept.first();
-
-                if (hitLoc.distanceSquared(startingVec) < bestHitResult) {
-                    bestHitResult = hitLoc.distanceSquared(startingVec);
-                    bestHitLoc = hitLoc;
-                    bestFace = intercept.second();
-                }
-            }
-            if (bestHitLoc != null) {
-                return new HitData(vector3i, bestHitLoc, bestFace, block);
-            }
-
-            if (sourcesHaveHitbox &&
-                    (player.compensatedWorld.isWaterSourceBlock(vector3i.getX(), vector3i.getY(), vector3i.getZ())
-                            || player.compensatedWorld.getLavaFluidLevelAt(vector3i.getX(), vector3i.getY(), vector3i.getZ()) == (8 / 9f))) {
-                double waterHeight = player.compensatedWorld.getFluidLevelAt(vector3i.getX(), vector3i.getY(), vector3i.getZ());
-                SimpleCollisionBox box = new SimpleCollisionBox(vector3i.getX(), vector3i.getY(), vector3i.getZ(), vector3i.getX() + 1, vector3i.getY() + waterHeight, vector3i.getZ() + 1);
-
-                Pair<Vector, BlockFace> intercept = ReachUtils.calculateIntercept(box, trace.getOrigin(), trace.getPointAtDistance(distance));
-
-                if (intercept.first() != null) {
-                    return new HitData(vector3i, intercept.first(), intercept.second(), block);
-                }
-            }
-
-            return null;
-        });
-    }
-
     @Override
     public void onPacketSend(PacketSendEvent event) {
         if (event.getConnectionState() != ConnectionState.PLAY) return;

src/main/java/ac/grim/grimac/events/packets/PacketEntityReplication.java

@@ -98,10 +98,6 @@ public class PacketEntityReplication extends Check implements PacketCheck {
             WrapperPlayServerSpawnPlayer packetOutEntity = new WrapperPlayServerSpawnPlayer(event);
             addEntity(packetOutEntity.getEntityId(), packetOutEntity.getUUID(), EntityTypes.PLAYER, packetOutEntity.getPosition(), packetOutEntity.getYaw(), packetOutEntity.getPitch(), packetOutEntity.getEntityMetadata(), 0);
         }
-        if (event.getPacketType() == PacketType.Play.Server.SPAWN_PAINTING) {
-            WrapperPlayServerSpawnPainting packetOutEntity = new WrapperPlayServerSpawnPainting(event);
-            addEntity(packetOutEntity.getEntityId(), packetOutEntity.getUUID(), EntityTypes.PAINTING, packetOutEntity.getPosition().toVector3d(), packetOutEntity.getDirection().getHorizontalIndex(), 0f, null, packetOutEntity.getType().isPresent() ? packetOutEntity.getType().get().getId() : -1);
-        }
 
         if (event.getPacketType() == PacketType.Play.Server.ENTITY_RELATIVE_MOVE) {
             WrapperPlayServerEntityRelativeMove move = new WrapperPlayServerEntityRelativeMove(event);
@@ -231,8 +227,9 @@ public class PacketEntityReplication extends Check implements PacketCheck {
 
             if (status.getStatus() == 31) {
                 PacketEntity hook = player.compensatedEntities.getEntity(status.getEntityId());
-                if (!(hook instanceof PacketEntityHook hookEntity)) return;
+                if (!(hook instanceof PacketEntityHook)) return;
 
+                PacketEntityHook hookEntity = (PacketEntityHook) hook;
                 if (hookEntity.attached == player.entityID) {
                     player.sendTransaction();
                     // We don't transaction sandwich this, it's too rare to be a real problem.
@@ -457,7 +454,8 @@ public class PacketEntityReplication extends Check implements PacketCheck {
         player.latencyUtils.addRealTimeTask(lastTrans, () -> {
             PacketEntity entity = player.compensatedEntities.getEntity(entityId);
             if (entity == null) return;
-            if (entity instanceof PacketEntityTrackXRot xRotEntity && yaw != null) {
+            if (entity instanceof PacketEntityTrackXRot && yaw != null) {
+                PacketEntityTrackXRot xRotEntity = (PacketEntityTrackXRot) entity;
                 xRotEntity.packetYaw = yaw;
                 xRotEntity.steps = entity.isBoat() ? 10 : 3;
             }

src/main/java/ac/grim/grimac/events/packets/PacketPlayerRespawn.java

@@ -19,11 +19,13 @@ import com.github.retrooper.packetevents.util.Vector3d;
 import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerJoinGame;
 import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerRespawn;
 import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerUpdateHealth;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.List;
 import java.util.Objects;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 /**
  * PlayerRespawnS2CPacket info (1.20.2+):
  * If the world is different (check via registry key), world is recreated (all entities etc destroyed).
@@ -185,7 +187,7 @@ public class PacketPlayerRespawn extends PacketListenerAbstract {
                     player.compensatedEntities.hasSprintingAttributeEnabled = false;
                 }
                 player.pose = Pose.STANDING;
-                player.clientVelocity = new Vector();
+                player.clientVelocity = newVector3D();
                 player.gamemode = respawn.getGameMode();
                 if (PacketEvents.getAPI().getServerManager().getVersion().isNewerThanOrEquals(ServerVersion.V_1_17)) {
                     player.compensatedWorld.setDimension(respawn.getDimensionType(), event.getUser());

src/main/java/ac/grim/grimac/events/packets/PacketPlayerSteer.java

@@ -22,7 +22,7 @@ public class PacketPlayerSteer extends PacketListenerAbstract {
 
     @Override
     public void onPacketReceive(PacketReceiveEvent event) {
-        //TODO: add support for 1.21.2 with new vehicle move packet
+
         if (event.getPacketType() == PacketType.Play.Client.STEER_VEHICLE) {
             WrapperPlayClientSteerVehicle steer = new WrapperPlayClientSteerVehicle(event);
 

src/main/java/ac/grim/grimac/events/packets/PacketPlayerWindow.java

@@ -0,0 +1,165 @@
+package ac.grim.grimac.events.packets;
+
+import ac.grim.grimac.GrimAPI;
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.data.packetentity.PacketEntitySelf;
+import ac.grim.grimac.utils.inventory.InventoryDesyncStatus;
+import com.github.retrooper.packetevents.PacketEvents;
+import com.github.retrooper.packetevents.event.PacketListenerAbstract;
+import com.github.retrooper.packetevents.event.PacketListenerPriority;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.event.PacketSendEvent;
+import com.github.retrooper.packetevents.manager.server.ServerVersion;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientClientStatus;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientClientStatus.Action;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientPlayerFlying;
+import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerOpenWindow;
+
+public class PacketPlayerWindow extends PacketListenerAbstract {
+
+    public PacketPlayerWindow() {
+        super(PacketListenerPriority.LOWEST);
+    }
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (WrapperPlayClientPlayerFlying.isFlying(event.getPacketType()) && !event.isCancelled()) {
+            GrimPlayer player = GrimAPI.INSTANCE.getPlayerDataManager().getPlayer(event.getUser());
+            if (player == null) return;
+
+            if (player.hasInventoryOpen && isNearNetherPortal(player)) {
+                handleInventoryClose(player, InventoryDesyncStatus.NETHER_PORTAL);
+            }
+        }
+
+        // Client Status is sent in 1.7-1.8
+        if (event.getPacketType() == PacketType.Play.Client.CLIENT_STATUS) {
+            WrapperPlayClientClientStatus wrapper = new WrapperPlayClientClientStatus(event);
+
+            if (wrapper.getAction() == Action.OPEN_INVENTORY_ACHIEVEMENT) {
+                GrimPlayer player = GrimAPI.INSTANCE.getPlayerDataManager().getPlayer(event.getUser());
+                if (player == null) return;
+
+                handleInventoryOpen(player);
+            }
+        }
+
+        // We need to do this due to 1.9 not sending anymore the inventory action in the Client Status
+        if (event.getPacketType() == PacketType.Play.Client.CLICK_WINDOW) {
+            GrimPlayer player = GrimAPI.INSTANCE.getPlayerDataManager().getPlayer(event.getUser());
+            if (player == null) return;
+
+            // TODO: Remove this check after we finish the before ViaVersion injection
+            // Explanation: On 1.7 and 1.8 we have OPEN_INVENTORY_ACHIEVEMENT on CLIENT_STATUS packet
+            // but after Via translation this information gets lost
+            // This is a workaround to atleast make our inventory checks work "decently" in 1.8 clients for 1.9+ servers
+            if (PacketEvents.getAPI().getServerManager().getVersion().isNewerThanOrEquals(ServerVersion.V_1_9)
+                    && player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8)) {
+                handleInventoryOpen(player);
+            }
+
+            if (player.getClientVersion().isNewerThan(ClientVersion.V_1_8)) {
+                handleInventoryOpen(player);
+            }
+        }
+
+        if (event.getPacketType() == PacketType.Play.Client.CLOSE_WINDOW) {
+            GrimPlayer player = GrimAPI.INSTANCE.getPlayerDataManager().getPlayer(event.getUser());
+            if (player == null) return;
+
+            handleInventoryClose(player, InventoryDesyncStatus.NOT_DESYNCED);
+        }
+    }
+
+    @Override
+    public void onPacketSend(PacketSendEvent event) {
+        if (event.getPacketType() == PacketType.Play.Server.RESPAWN) {
+            GrimPlayer player = GrimAPI.INSTANCE.getPlayerDataManager().getPlayer(event.getUser());
+            if (player == null) return;
+
+            player.sendTransaction();
+
+            player.latencyUtils.addRealTimeTask(player.lastTransactionSent.get(),
+                    () -> handleInventoryClose(player, InventoryDesyncStatus.NOT_DESYNCED));
+        } else if (event.getPacketType() == PacketType.Play.Server.OPEN_WINDOW) {
+            WrapperPlayServerOpenWindow wrapper = new WrapperPlayServerOpenWindow(event);
+
+            GrimPlayer player = GrimAPI.INSTANCE.getPlayerDataManager().getPlayer(event.getUser());
+            if (player == null) return;
+
+            player.sendTransaction();
+
+            String legacyType = wrapper.getLegacyType();
+            int modernType = wrapper.getType();
+            InventoryDesyncStatus inventoryDesyncStatus = getContainerDesyncStatus(player, legacyType, modernType);
+
+            player.latencyUtils.addRealTimeTask(player.lastTransactionSent.get(),
+                    () -> {
+                        if (inventoryDesyncStatus == InventoryDesyncStatus.NOT_DESYNCED) {
+                            handleInventoryOpen(player);
+                        } else {
+                            handleInventoryClose(player, inventoryDesyncStatus);
+                        }
+                    });
+        } else if (event.getPacketType() == PacketType.Play.Server.OPEN_HORSE_WINDOW) {
+            GrimPlayer player = GrimAPI.INSTANCE.getPlayerDataManager().getPlayer(event.getUser());
+            if (player == null) return;
+
+            player.sendTransaction();
+
+            player.latencyUtils.addRealTimeTask(player.lastTransactionSent.get(),
+                    () -> handleInventoryOpen(player));
+        } else if (event.getPacketType() == PacketType.Play.Server.CLOSE_WINDOW) {
+            GrimPlayer player = GrimAPI.INSTANCE.getPlayerDataManager().getPlayer(event.getUser());
+            if (player == null) return;
+
+            player.sendTransaction();
+
+            player.latencyUtils.addRealTimeTask(player.lastTransactionSent.get(),
+                    () -> handleInventoryClose(player, InventoryDesyncStatus.NOT_DESYNCED));
+        }
+    }
+
+    private void handleInventoryOpen(GrimPlayer player) {
+        if (!player.hasInventoryOpen) {
+            player.lastInventoryOpen = System.currentTimeMillis();
+        }
+
+        player.hasInventoryOpen = true;
+    }
+
+    private void handleInventoryClose(GrimPlayer player, InventoryDesyncStatus desyncStatus) {
+        player.hasInventoryOpen = false;
+        player.inventoryDesyncStatus = desyncStatus;
+    }
+
+    public InventoryDesyncStatus getContainerDesyncStatus(GrimPlayer player, String legacyType, int modernType) {
+        // Closing beacon with the cross button cause desync in 1.7-1.8
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_8) &&
+                ("minecraft:beacon".equals(legacyType) || modernType == 8)) {
+            return player.inventoryDesyncStatus = InventoryDesyncStatus.BEACON;
+        }
+
+        if (isNearNetherPortal(player)) {
+            return player.inventoryDesyncStatus = InventoryDesyncStatus.NETHER_PORTAL;
+        }
+
+        return player.inventoryDesyncStatus = InventoryDesyncStatus.NOT_DESYNCED;
+    }
+
+    public boolean isNearNetherPortal(GrimPlayer player) {
+        // Going inside nether portal with opened inventory cause desync, fixed in 1.12.2
+        if (player.getClientVersion().isOlderThanOrEquals(ClientVersion.V_1_12_1) &&
+                player.pointThreeEstimator.isNearNetherPortal) {
+            PacketEntitySelf playerEntity = player.compensatedEntities.getSelf();
+            // Client ignore nether portal if player has passengers or riding an entity
+            if (!playerEntity.inVehicle() && playerEntity.passengers.isEmpty()) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}

src/main/java/ac/grim/grimac/events/packets/patch/ResyncWorldUtil.java

@@ -12,7 +12,6 @@ import com.github.retrooper.packetevents.util.Vector3i;
 import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerMultiBlockChange;
 import io.github.retrooper.packetevents.util.folia.FoliaScheduler;
 import org.bukkit.Chunk;
-import org.bukkit.World;
 import org.bukkit.block.Block;
 import org.bukkit.block.data.BlockData;
 
@@ -36,20 +35,19 @@ public class ResyncWorldUtil {
                 || !player.compensatedWorld.isChunkLoaded(maxBlockX >> 4, minBlockZ >> 4) || !player.compensatedWorld.isChunkLoaded(maxBlockX >> 4, maxBlockZ >> 4))
             return;
 
-        if (player.bukkitPlayer == null) return;
-        World world = player.bukkitPlayer.getWorld();
-
         // Takes 0.15ms or so to complete. Not bad IMO. Unsure how I could improve this other than sending packets async.
         // But that's on PacketEvents.
-        FoliaScheduler.getRegionScheduler().execute(GrimAPI.INSTANCE.getPlugin(), world,
+        FoliaScheduler.getRegionScheduler().execute(GrimAPI.INSTANCE.getPlugin(), player.bukkitPlayer.getWorld(),
                 minBlockX >> 4, minBlockZ >> 4, () -> {
             boolean flat = PacketEvents.getAPI().getServerManager().getVersion().isNewerThanOrEquals(ServerVersion.V_1_13);
+
+            if (player.bukkitPlayer == null) return;
             // Player hasn't spawned, don't spam packets
             if (!player.getSetbackTeleportUtil().hasAcceptedSpawnTeleport) return;
 
             // Check the 4 corners of the BB for loaded chunks, don't freeze main thread to load chunks.
-            if (!world.isChunkLoaded(minBlockX >> 4, minBlockZ >> 4) || !world.isChunkLoaded(minBlockX >> 4, maxBlockZ >> 4)
-                    || !world.isChunkLoaded(maxBlockX >> 4, minBlockZ >> 4) || !world.isChunkLoaded(maxBlockX >> 4, maxBlockZ >> 4))
+            if (!player.bukkitPlayer.getWorld().isChunkLoaded(minBlockX >> 4, minBlockZ >> 4) || !player.bukkitPlayer.getWorld().isChunkLoaded(minBlockX >> 4, maxBlockZ >> 4)
+                    || !player.bukkitPlayer.getWorld().isChunkLoaded(maxBlockX >> 4, minBlockZ >> 4) || !player.bukkitPlayer.getWorld().isChunkLoaded(maxBlockX >> 4, maxBlockZ >> 4))
                 return;
 
             // This is based on Tuinity's code, thanks leaf. Now merged into paper.
@@ -78,7 +76,7 @@ public class ResyncWorldUtil {
                     int minX = currChunkX == minChunkX ? minBlockX & 15 : 0; // coordinate in chunk
                     int maxX = currChunkX == maxChunkX ? maxBlockX & 15 : 15; // coordinate in chunk
 
-                    Chunk chunk = world.getChunkAt(currChunkX, currChunkZ);
+                    Chunk chunk = player.bukkitPlayer.getWorld().getChunkAt(currChunkX, currChunkZ);
 
                     for (int currChunkY = minChunkY; currChunkY <= maxChunkY; ++currChunkY) {
                         int minY = currChunkY == minChunkY ? minBlockY & 15 : 0; // coordinate in chunk

src/main/java/ac/grim/grimac/events/packets/worldreader/PacketWorldReaderEight.java

@@ -15,7 +15,7 @@ import java.util.BitSet;
 public class PacketWorldReaderEight extends BasePacketWorldReader {
     @Override
     public void handleMapChunkBulk(final GrimPlayer player, final PacketSendEvent event) {
-        PacketWrapper<?> wrapper = new PacketWrapper<>(event);
+        PacketWrapper wrapper = new PacketWrapper(event);
         ByteBuf buffer = (ByteBuf) wrapper.getBuffer();
 
         boolean skylight = wrapper.readBoolean();
@@ -47,7 +47,7 @@ public class PacketWorldReaderEight extends BasePacketWorldReader {
 
     @Override
     public void handleMapChunk(final GrimPlayer player, final PacketSendEvent event) {
-        PacketWrapper<?> wrapper = new PacketWrapper<>(event);
+        PacketWrapper wrapper = new PacketWrapper(event);
 
         final int chunkX = wrapper.readInt();
         final int chunkZ = wrapper.readInt();

src/main/java/ac/grim/grimac/manager/CheckManager.java

@@ -12,12 +12,13 @@ import ac.grim.grimac.checks.impl.crash.*;
 import ac.grim.grimac.checks.impl.exploit.ExploitA;
 import ac.grim.grimac.checks.impl.exploit.ExploitB;
 import ac.grim.grimac.checks.impl.groundspoof.NoFallA;
+import ac.grim.grimac.checks.impl.inventory.*;
 import ac.grim.grimac.checks.impl.misc.ClientBrand;
 import ac.grim.grimac.checks.impl.misc.FastBreak;
 import ac.grim.grimac.checks.impl.misc.GhostBlockMitigation;
-import ac.grim.grimac.checks.impl.misc.TransactionOrder;
 import ac.grim.grimac.checks.impl.movement.*;
-import ac.grim.grimac.checks.impl.post.PostCheck;
+import ac.grim.grimac.checks.impl.packetorder.*;
+import ac.grim.grimac.checks.impl.post.Post;
 import ac.grim.grimac.checks.impl.prediction.DebugHandler;
 import ac.grim.grimac.checks.impl.prediction.NoFallB;
 import ac.grim.grimac.checks.impl.prediction.OffsetHandler;
@@ -85,12 +86,10 @@ public class CheckManager {
                 .put(BadPacketsE.class, new BadPacketsE(player))
                 .put(BadPacketsF.class, new BadPacketsF(player))
                 .put(BadPacketsG.class, new BadPacketsG(player))
-                .put(BadPacketsH.class, new BadPacketsH(player))
                 .put(BadPacketsI.class, new BadPacketsI(player))
                 .put(BadPacketsJ.class, new BadPacketsJ(player))
                 .put(BadPacketsK.class, new BadPacketsK(player))
                 .put(BadPacketsL.class, new BadPacketsL(player))
-                .put(BadPacketsM.class, new BadPacketsM(player))
                 .put(BadPacketsN.class, new BadPacketsN(player))
                 .put(BadPacketsP.class, new BadPacketsP(player))
                 .put(BadPacketsQ.class, new BadPacketsQ(player))
@@ -103,8 +102,16 @@ public class CheckManager {
                 .put(BadPacketsX.class, new BadPacketsX(player))
                 .put(BadPacketsY.class, new BadPacketsY(player))
                 .put(BadPacketsZ.class, new BadPacketsZ(player))
+                .put(InventoryA.class, new InventoryA(player))
+                .put(InventoryB.class, new InventoryB(player))
+                .put(InventoryE.class, new InventoryE(player))
+                .put(InventoryF.class, new InventoryF(player))
+                .put(InventoryG.class, new InventoryG(player))
                 .put(FastBreak.class, new FastBreak(player))
-                .put(TransactionOrder.class, new TransactionOrder(player))
+                .put(PacketOrderB.class, new PacketOrderB(player))
+                .put(PacketOrderC.class, new PacketOrderC(player))
+                .put(PacketOrderD.class, new PacketOrderD(player))
+                .put(PacketOrderP.class, new PacketOrderP(player))
                 .put(NoSlowB.class, new NoSlowB(player))
                 .put(SetbackBlocker.class, new SetbackBlocker(player)) // Must be last class otherwise we can't check while blocking packets
                 .build();
@@ -127,8 +134,20 @@ public class CheckManager {
                 .put(ExplosionHandler.class, new ExplosionHandler(player))
                 .put(KnockbackHandler.class, new KnockbackHandler(player))
                 .put(GhostBlockDetector.class, new GhostBlockDetector(player))
+                .put(InventoryD.class, new InventoryD(player))
                 .put(Phase.class, new Phase(player))
-                .put(PostCheck.class, new PostCheck(player))
+                .put(PacketOrderProcessor.class, player.packetOrderProcessor)
+                .put(Post.class, new Post(player))
+                .put(PacketOrderA.class, new PacketOrderA(player))
+                .put(PacketOrderE.class, new PacketOrderE(player))
+                .put(PacketOrderF.class, new PacketOrderF(player))
+                .put(PacketOrderG.class, new PacketOrderG(player))
+                .put(PacketOrderH.class, new PacketOrderH(player))
+                .put(PacketOrderI.class, new PacketOrderI(player))
+                .put(PacketOrderJ.class, new PacketOrderJ(player))
+                .put(PacketOrderK.class, new PacketOrderK(player))
+                .put(PacketOrderL.class, new PacketOrderL(player))
+                .put(PacketOrderM.class, new PacketOrderM(player))
                 .put(NoFallB.class, new NoFallB(player))
                 .put(OffsetHandler.class, new OffsetHandler(player))
                 .put(SuperDebug.class, new SuperDebug(player))
@@ -147,6 +166,7 @@ public class CheckManager {
                 .build();
 
         blockPlaceCheck = new ImmutableClassToInstanceMap.Builder<BlockPlaceCheck>()
+                .put(InventoryC.class, new InventoryC(player))
                 .put(InvalidPlaceA.class, new InvalidPlaceA(player))
                 .put(InvalidPlaceB.class, new InvalidPlaceB(player))
                 .put(AirLiquidPlace.class, new AirLiquidPlace(player))
@@ -154,8 +174,10 @@ public class CheckManager {
                 .put(FarPlace.class, new FarPlace(player))
                 .put(FabricatedPlace.class, new FabricatedPlace(player))
                 .put(PositionPlace.class, new PositionPlace(player))
-                .put(RotationPlace.class, new RotationPlace(player))
+                .put(PacketOrderN.class, new PacketOrderN(player))
+                .put(PacketOrderO.class, new PacketOrderO(player))
                 .put(DuplicateRotPlace.class, new DuplicateRotPlace(player))
+                .put(LineOfSightPlace.class, new LineOfSightPlace(player))
                 .put(GhostBlockMitigation.class, new GhostBlockMitigation(player))
                 .build();
 
@@ -286,11 +308,17 @@ public class CheckManager {
         return (T) packetChecks.get(check);
     }
 
+    @SuppressWarnings("unchecked")
+    public <T extends BlockPlaceCheck> T getBlockPlaceCheck(Class<T> check) {
+        return (T) blockPlaceCheck.get(check);
+    }
+
     @SuppressWarnings("unchecked")
     public <T extends PacketCheck> T getPrePredictionCheck(Class<T> check) {
         return (T) prePredictionChecks.get(check);
     }
 
+
     private PacketEntityReplication packetEntityReplication = null;
 
     public PacketEntityReplication getEntityReplication() {

src/main/java/ac/grim/grimac/manager/SetbackTeleportUtil.java

@@ -19,6 +19,7 @@ import ac.grim.grimac.utils.math.VectorUtils;
 import ac.grim.grimac.utils.nmsutil.Collisions;
 import ac.grim.grimac.utils.nmsutil.GetBoundingBox;
 import ac.grim.grimac.utils.nmsutil.ReachUtils;
+import ac.grim.grimac.utils.vector.Vector3D;
 import com.github.retrooper.packetevents.PacketEvents;
 import com.github.retrooper.packetevents.manager.server.ServerVersion;
 import com.github.retrooper.packetevents.protocol.player.GameMode;
@@ -31,13 +32,15 @@ import lombok.Getter;
 import lombok.Setter;
 import org.bukkit.Location;
 import org.bukkit.entity.Entity;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.Random;
 import java.util.concurrent.ConcurrentLinkedQueue;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 public class SetbackTeleportUtil extends Check implements PostPredictionCheck {
     // Sync to netty
     public final ConcurrentLinkedQueue<TeleportData> pendingTeleports = new ConcurrentLinkedQueue<>();
@@ -65,7 +68,7 @@ public class SetbackTeleportUtil extends Check implements PostPredictionCheck {
     @Override
     public void onPredictionComplete(final PredictionComplete predictionComplete) {
         // Grab friction now when we know player on ground and other variables
-        Vector afterTickFriction = player.clientVelocity.clone();
+        Vector3D afterTickFriction = player.clientVelocity.clone();
 
         // We must first check if the player has accepted their setback
         // If the setback isn't complete, then this position is illegitimate
@@ -115,7 +118,7 @@ public class SetbackTeleportUtil extends Check implements PostPredictionCheck {
         return false;
     }
 
-    private void simulateFriction(Vector vector) {
+    private void simulateFriction(Vector3D vector) {
         // We must always do this before simulating positions, as this is the last actual (safe) movement
         // We must not do this for knockback or explosions, as they are at the start of the tick
         if (player.wasTouchingWater) {
@@ -123,9 +126,9 @@ public class SetbackTeleportUtil extends Check implements PostPredictionCheck {
         } else if (player.wasTouchingLava) {
             vector.multiply(0.5D);
             if (player.hasGravity)
-                vector.add(new Vector(0.0D, -player.gravity / 4.0D, 0.0D));
+                vector.add(newVector3D(0.0D, -player.gravity / 4.0D, 0.0D));
         } else if (player.isGliding) {
-            PredictionEngineElytra.getElytraMovement(player, vector, ReachUtils.getLook(player, player.xRot, player.yRot)).multiply(player.stuckSpeedMultiplier).multiply(new Vector(0.99F, 0.98F, 0.99F));
+            PredictionEngineElytra.getElytraMovement(player, vector, ReachUtils.getLook(player, player.xRot, player.yRot)).multiply(player.stuckSpeedMultiplier).multiply(newVector3D(0.99F, 0.98F, 0.99F));
             vector.setY(vector.getY() - 0.05); // Make the player fall a bit
         } else { // Gliding doesn't have friction, we handle it differently
             PredictionEngineNormal.staticVectorEndOfTick(player, vector); // Lava and normal movement
@@ -147,18 +150,18 @@ public class SetbackTeleportUtil extends Check implements PostPredictionCheck {
             lastWorldResync = System.currentTimeMillis();
         }
 
-        Vector clientVel = lastKnownGoodPosition.vector.clone();
+        Vector3D clientVel = lastKnownGoodPosition.vector.clone();
 
-        Pair<VelocityData, Vector> futureKb = player.checkManager.getKnockbackHandler().getFutureKnockback();
+        Pair<VelocityData, Vector3D> futureKb = player.checkManager.getKnockbackHandler().getFutureKnockback();
         VelocityData futureExplosion = player.checkManager.getExplosionHandler().getFutureExplosion();
 
         // Velocity sets
-        if (futureKb.first() != null) {
-            clientVel = futureKb.second();
+        if (futureKb.getFirst() != null) {
+            clientVel = futureKb.getSecond();
         }
 
         // Explosion adds
-        if (futureExplosion != null && (futureKb.first() == null || futureKb.first().transaction < futureExplosion.transaction)) {
+        if (futureExplosion != null && (futureKb.getFirst() == null || futureKb.getFirst().transaction < futureExplosion.transaction)) {
             clientVel.add(futureExplosion.vector);
         }
 
@@ -169,7 +172,7 @@ public class SetbackTeleportUtil extends Check implements PostPredictionCheck {
 
         // Mini prediction engine - simulate collisions
         if (simulateNextTickPosition) {
-            Vector collide = Collisions.collide(player, clientVel.getX(), clientVel.getY(), clientVel.getZ());
+            Vector3D collide = Collisions.collide(player, clientVel.getX(), clientVel.getY(), clientVel.getZ());
 
             position = position.withX(position.getX() + collide.getX());
             // 1.8 players need the collision epsilon to not phase into blocks when being setback
@@ -328,16 +331,16 @@ public class SetbackTeleportUtil extends Check implements PostPredictionCheck {
         while (true) {
             Pair<Integer, Vector3d> teleportPos = player.vehicleData.vehicleTeleports.peek();
             if (teleportPos == null) break;
-            if (lastTransaction < teleportPos.first()) {
+            if (lastTransaction < teleportPos.getFirst()) {
                 break;
             }
 
-            Vector3d position = teleportPos.second();
+            Vector3d position = teleportPos.getSecond();
             if (position.getX() == x && position.getY() == y && position.getZ() == z) {
                 player.vehicleData.vehicleTeleports.poll();
 
                 return true;
-            } else if (lastTransaction > teleportPos.first() + 1) {
+            } else if (lastTransaction > teleportPos.getFirst() + 1) {
                 player.vehicleData.vehicleTeleports.poll();
 
                 // Vehicles have terrible netcode so just ignore it if the teleport wasn't from us setting the player back
@@ -412,7 +415,7 @@ public class SetbackTeleportUtil extends Check implements PostPredictionCheck {
         data = new TeleportData(safePosition, flags, transaction, teleportId);
         requiredSetBack = new SetBackData(data, player.xRot, player.yRot, null, false, plugin);
 
-        this.lastKnownGoodPosition = new SetbackPosWithVector(safePosition, new Vector());
+        this.lastKnownGoodPosition = new SetbackPosWithVector(safePosition, newVector3D());
     }
 
     @AllArgsConstructor
@@ -420,6 +423,6 @@ public class SetbackTeleportUtil extends Check implements PostPredictionCheck {
     @Setter
     public static class SetbackPosWithVector {
         private Vector3d pos;
-        private Vector vector;
+        private Vector3D vector;
     }
 }

src/main/java/ac/grim/grimac/manager/SpectateManager.java

@@ -71,8 +71,14 @@ public class SpectateManager implements Initable {
         spectatingPlayers.remove(uuid);
     }
 
-    private record PreviousState(org.bukkit.GameMode gameMode, Location location) {
+    private static class PreviousState {
+        public PreviousState(org.bukkit.GameMode gameMode, Location location) {
+            this.gameMode = gameMode;
+            this.location = location;
+        }
 
+        private final org.bukkit.GameMode gameMode;
+        private final Location location;
     }
 
 }

src/main/java/ac/grim/grimac/manager/TickManager.java

@@ -4,6 +4,7 @@ import ac.grim.grimac.manager.tick.Tickable;
 import ac.grim.grimac.manager.tick.impl.ClientVersionSetter;
 import ac.grim.grimac.manager.tick.impl.ResetTick;
 import ac.grim.grimac.manager.tick.impl.TickInventory;
+import ac.grim.grimac.manager.tick.impl.UpdateChangedBlocksList;
 import com.google.common.collect.ClassToInstanceMap;
 import com.google.common.collect.ImmutableClassToInstanceMap;
 
@@ -22,6 +23,7 @@ public class TickManager {
         asyncTick = new ImmutableClassToInstanceMap.Builder<Tickable>()
                 .put(ClientVersionSetter.class, new ClientVersionSetter()) // Async because permission lookups might take a while, depending on the plugin
                 .put(TickInventory.class, new TickInventory()) // Async because I've never gotten an exception from this.  It's probably safe.
+                .put(UpdateChangedBlocksList.class, new UpdateChangedBlocksList())
                 .build();
     }
 

src/main/java/ac/grim/grimac/manager/config/ConfigManagerFileImpl.java

@@ -32,6 +32,7 @@ public class ConfigManagerFileImpl implements ConfigManager, BasicReloadable {
         GrimAPI.INSTANCE.getPlugin().getDataFolder().mkdirs();
         if (!initialized) {
             initialized = true;
+            upgrade();
             config.addSource(GrimAC.class, "config", getConfigFile("config.yml"));
             config.addSource(GrimAC.class, "messages", getConfigFile("messages.yml"));
             config.addSource(GrimAC.class, "discord", getConfigFile("discord.yml"));
@@ -81,7 +82,7 @@ public class ConfigManagerFileImpl implements ConfigManager, BasicReloadable {
 
                     configVersion = Integer.parseInt(configStringVersion);
                     // TODO: Do we have to hardcode this?
-                    configString = configString.replaceAll("config-version: " + configStringVersion, "config-version: 9");
+                    configString = configString.replaceAll("config-version: " + configStringVersion, "config-version: 10");
                     Files.write(config.toPath(), configString.getBytes());
 
                     upgradeModernConfig(config, configString, configVersion);
@@ -123,6 +124,9 @@ public class ConfigManagerFileImpl implements ConfigManager, BasicReloadable {
         if (configVersion < 9) {
             newOffsetHandlingAntiKB(config, configString);
         }
+        if (configVersion < 10) {
+            addInventoryPunishments();
+        }
     }
 
     private void removeLegacyTwoPointOne(File config) throws IOException {
@@ -173,6 +177,28 @@ public class ConfigManagerFileImpl implements ConfigManager, BasicReloadable {
         }
     }
 
+    private void addInventoryPunishments() {
+        File config = new File(GrimAPI.INSTANCE.getPlugin().getDataFolder(), "punishments.yml");
+        String configString;
+        if (config.exists()) {
+            try {
+                configString = new String(Files.readAllBytes(config.toPath()));
+
+                // If it works, it isn't stupid.  Only replace it if it exactly matches the default config.
+                String reachSection = "  Reach:";
+                String inventorySection = "  Inventory:\n    remove-violations-after: 300\n    checks:\n      - \"Inventory\"\n    commands:\n      - \"10:10 [alert]\"\n      - \"20:20 [webhook]\"\n      - \"20:20 [proxy]\"\n";
+
+                int index = configString.indexOf(reachSection);
+                if (index != -1) {
+                    configString = configString.substring(0, index) + inventorySection + configString.substring(index);
+                }
+
+                Files.write(config.toPath(), configString.getBytes());
+            } catch (IOException ignored) {
+            }
+        }
+    }
+
     private void fixBadPacketsAndAdjustPingConfig(File config, String configString) {
         try {
             configString = configString.replaceAll("max-ping: \\d+", "max-transaction-time: 60");

src/main/java/ac/grim/grimac/manager/init/start/BStats.java

@@ -2,14 +2,13 @@ package ac.grim.grimac.manager.init.start;
 
 import ac.grim.grimac.GrimAPI;
 import ac.grim.grimac.manager.init.Initable;
-import io.github.retrooper.packetevents.bstats.bukkit.Metrics;
 
 public class BStats implements Initable {
     @Override
     public void start() {
         int pluginId = 12820; // <-- Replace with the id of your plugin!
         try {
-            new Metrics(GrimAPI.INSTANCE.getPlugin(), pluginId);
+            new io.github.retrooper.packetevents.bstats.bukkit.Metrics(GrimAPI.INSTANCE.getPlugin(), pluginId);
         } catch (Exception ignored) {
         }
     }

src/main/java/ac/grim/grimac/manager/init/start/CommandRegister.java

@@ -23,7 +23,5 @@ public class CommandRegister implements Initable {
         commandManager.registerCommand(new GrimStopSpectating());
         commandManager.registerCommand(new GrimLog());
         commandManager.registerCommand(new GrimVerbose());
-
-        commandManager.getCommandCompletions().registerCompletion("stopspectating", GrimStopSpectating.completionHandler);
     }
 }

src/main/java/ac/grim/grimac/manager/init/start/PacketManager.java

@@ -19,6 +19,7 @@ public class PacketManager implements Initable {
         PacketEvents.getAPI().getEventManager().registerListener(new PacketConfigurationListener());
         PacketEvents.getAPI().getEventManager().registerListener(new PacketPlayerJoinQuit());
         PacketEvents.getAPI().getEventManager().registerListener(new PacketPingListener());
+        PacketEvents.getAPI().getEventManager().registerListener(new PacketPlayerWindow());
         PacketEvents.getAPI().getEventManager().registerListener(new PacketPlayerDigging());
         PacketEvents.getAPI().getEventManager().registerListener(new PacketPlayerAttack());
         PacketEvents.getAPI().getEventManager().registerListener(new PacketEntityAction());

src/main/java/ac/grim/grimac/manager/init/start/SuperDebug.java

@@ -10,26 +10,29 @@ import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
 import ac.grim.grimac.utils.data.VectorData;
 import ac.grim.grimac.utils.lists.EvictingQueue;
 import ac.grim.grimac.utils.math.GrimMath;
+import ac.grim.grimac.utils.vector.Vector3D;
 import com.github.retrooper.packetevents.PacketEvents;
 import com.github.retrooper.packetevents.protocol.world.states.WrappedBlockState;
+import com.github.retrooper.packetevents.util.Vector3d;
 import it.unimi.dsi.fastutil.objects.Object2IntMap;
 import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
 import lombok.AllArgsConstructor;
-import org.bukkit.util.Vector;
 
 import java.util.*;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 public final class SuperDebug extends Check implements PostPredictionCheck {
     private static final StringBuilder[] flags = new StringBuilder[256]; //  17 MB of logs in memory
 
     Object2IntMap<StringBuilder> continuedDebug = new Object2IntOpenHashMap<>();
 
     List<VectorData> predicted = new EvictingQueue<>(60);
-    List<Vector> actually = new EvictingQueue<>(60);
+    List<Vector3D> actually = new EvictingQueue<>(60);
     List<Location> locations = new EvictingQueue<>(60);
-    List<Vector> startTickClientVel = new EvictingQueue<>(60);
-    List<Vector> baseTickAddition = new EvictingQueue<>(60);
-    List<Vector> baseTickWater = new EvictingQueue<>(60);
+    List<Vector3D> startTickClientVel = new EvictingQueue<>(60);
+    List<Vector3D> baseTickAddition = new EvictingQueue<>(60);
+    List<Vector3D> baseTickWater = new EvictingQueue<>(60);
 
     public SuperDebug(GrimPlayer player) {
         super(player);
@@ -80,11 +83,11 @@ public final class SuperDebug extends Check implements PostPredictionCheck {
 
         for (int i = 0; i < predicted.size(); i++) {
             VectorData predict = predicted.get(i);
-            Vector actual = actually.get(i);
+            Vector3D actual = actually.get(i);
             Location loc = locations.get(i);
-            Vector startTickVel = startTickClientVel.get(i);
-            Vector addition = baseTickAddition.get(i);
-            Vector water = baseTickWater.get(i);
+            Vector3D startTickVel = startTickClientVel.get(i);
+            Vector3D addition = baseTickAddition.get(i);
+            Vector3D water = baseTickWater.get(i);
             appendDebug(sb, predict, actual, loc, startTickVel, addition, water);
         }
 
@@ -189,7 +192,7 @@ public final class SuperDebug extends Check implements PostPredictionCheck {
         continuedDebug.put(sb, 40);
     }
 
-    private void appendDebug(StringBuilder sb, VectorData predict, Vector actual, Location location, Vector startTick, Vector addition, Vector water) {
+    private void appendDebug(StringBuilder sb, VectorData predict, Vector3D actual, Location location, Vector3D startTick, Vector3D addition, Vector3D water) {
         if (predict.isZeroPointZeroThree()) {
             sb.append("Movement threshold/tick skipping\n");
         }
@@ -225,11 +228,11 @@ public final class SuperDebug extends Check implements PostPredictionCheck {
         // Apply 0.003/0.005 to make numbers more accurate
         Set<VectorData> set = new HashSet<>(Collections.singletonList(new VectorData(startTick.clone(), VectorData.VectorType.BestVelPicked)));
         new PredictionEngine().applyMovementThreshold(player, set);
-        Vector trueStartVel = ((VectorData) set.toArray()[0]).vector;
+        Vector3D trueStartVel = ((VectorData) set.toArray()[0]).vector;
 
-        Vector clientMovement = getPlayerMathMovement(player, actual.clone().subtract(trueStartVel), location.xRot);
-        Vector simulatedMovement = getPlayerMathMovement(player, predict.vector.clone().subtract(trueStartVel), location.xRot);
-        Vector offset = actual.clone().subtract(predict.vector);
+        Vector3D clientMovement = getPlayerMathMovement(player, actual.clone().subtract(trueStartVel), location.xRot);
+        Vector3D simulatedMovement = getPlayerMathMovement(player, predict.vector.clone().subtract(trueStartVel), location.xRot);
+        Vector3D offset = actual.clone().subtract(predict.vector);
         trueStartVel.add(addition);
         trueStartVel.add(water);
 
@@ -268,14 +271,14 @@ public final class SuperDebug extends Check implements PostPredictionCheck {
         sb.append("\n\n");
     }
 
-    private Vector getPlayerMathMovement(GrimPlayer player, Vector wantedMovement, float f2) {
+    private Vector3D getPlayerMathMovement(GrimPlayer player, Vector3D wantedMovement, float f2) {
         float f3 = player.trigHandler.sin(f2 * 0.017453292f);
         float f4 = player.trigHandler.cos(f2 * 0.017453292f);
 
         float bestTheoreticalX = (float) (f3 * wantedMovement.getZ() + f4 * wantedMovement.getX()) / (f3 * f3 + f4 * f4);
         float bestTheoreticalZ = (float) (-f3 * wantedMovement.getX() + f4 * wantedMovement.getZ()) / (f3 * f3 + f4 * f4);
 
-        return new Vector(bestTheoreticalX, 0, bestTheoreticalZ);
+        return newVector3D(bestTheoreticalX, 0, bestTheoreticalZ);
     }
 
     @AllArgsConstructor

src/main/java/ac/grim/grimac/manager/init/start/TickEndEvent.java

@@ -42,7 +42,7 @@ public class TickEndEvent implements Initable {
             // but whatever.  At least plugins can't break it, I guess.
             //
             // Pledge injects into another list, so we should be safe injecting into this one
-            List<?> wrapper = Collections.synchronizedList(new HookedListWrapper<>(endOfTickObject) {
+            List<?> wrapper = Collections.synchronizedList(new HookedListWrapper<Object>(endOfTickObject) {
                 @Override
                 public void onIterator() {
                     hasTicked = true;

src/main/java/ac/grim/grimac/manager/tick/impl/UpdateChangedBlocksList.java

@@ -0,0 +1,15 @@
+package ac.grim.grimac.manager.tick.impl;
+
+import ac.grim.grimac.GrimAPI;
+import ac.grim.grimac.manager.tick.Tickable;
+import ac.grim.grimac.player.GrimPlayer;
+
+
+public class UpdateChangedBlocksList implements Tickable {
+    @Override
+    public void tick() {
+        for (GrimPlayer player : GrimAPI.INSTANCE.getPlayerDataManager().getEntries()) {
+
+        }
+    }
+}

src/main/java/ac/grim/grimac/player/GrimPlayer.java

@@ -7,7 +7,8 @@ import ac.grim.grimac.api.config.ConfigManager;
 import ac.grim.grimac.checks.Check;
 import ac.grim.grimac.checks.impl.aim.processor.AimProcessor;
 import ac.grim.grimac.checks.impl.misc.ClientBrand;
-import ac.grim.grimac.checks.impl.misc.TransactionOrder;
+import ac.grim.grimac.checks.impl.packetorder.PacketOrderD;
+import ac.grim.grimac.checks.impl.packetorder.PacketOrderProcessor;
 import ac.grim.grimac.events.packets.CheckManagerListener;
 import ac.grim.grimac.manager.*;
 import ac.grim.grimac.predictionengine.MovementCheckRunner;
@@ -21,6 +22,7 @@ import ac.grim.grimac.utils.data.packetentity.PacketEntitySelf;
 import ac.grim.grimac.utils.data.tags.SyncedTags;
 import ac.grim.grimac.utils.enums.FluidTag;
 import ac.grim.grimac.utils.enums.Pose;
+import ac.grim.grimac.utils.inventory.InventoryDesyncStatus;
 import ac.grim.grimac.utils.latency.*;
 import ac.grim.grimac.utils.math.GrimMath;
 import ac.grim.grimac.utils.math.TrigHandler;
@@ -54,7 +56,7 @@ import net.kyori.adventure.text.TranslatableComponent;
 import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
 import org.bukkit.entity.Player;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.*;
@@ -64,6 +66,10 @@ import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import static ac.grim.grimac.utils.data.VectorData.VectorType;
+import static ac.grim.grimac.utils.data.VectorData.VectorType.Normal;
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 // Everything in this class should be sync'd to the anticheat thread.
 // Put variables sync'd to the netty thread in PacketStateData
 // Variables that need lag compensation should have their own class
@@ -90,8 +96,9 @@ public class GrimPlayer implements GrimUser {
     public MovementCheckRunner movementCheckRunner;
     public SyncedTags tagManager;
     // End manager like classes
-    public Vector clientVelocity = new Vector();
+    public ac.grim.grimac.utils.vector.Vector3D clientVelocity = newVector3D();
     PacketTracker packetTracker;
+    public final PacketOrderProcessor packetOrderProcessor = new PacketOrderProcessor(this);
     private long transactionPing = 0;
     public long lastTransSent = 0;
     public long lastTransReceived = 0;
@@ -103,9 +110,9 @@ public class GrimPlayer implements GrimUser {
     public boolean hasGravity = true;
     public final long joinTime = System.currentTimeMillis();
     public boolean playerEntityHasGravity = true;
-    public VectorData predictedVelocity = new VectorData(new Vector(), VectorData.VectorType.Normal);
-    public Vector actualMovement = new Vector();
-    public Vector stuckSpeedMultiplier = new Vector(1, 1, 1);
+    public VectorData predictedVelocity = new VectorData(newVector3D(), Normal);
+    public Vector3D actualMovement = newVector3D();
+    public Vector3D stuckSpeedMultiplier = newVector3D(1, 1, 1);
     public UncertaintyHandler uncertaintyHandler;
     public double gravity;
     public float friction;
@@ -184,9 +191,9 @@ public class GrimPlayer implements GrimUser {
     public TrigHandler trigHandler;
     public PacketStateData packetStateData;
     // Keep track of basetick stuff
-    public Vector baseTickAddition = new Vector();
-    public Vector baseTickWaterPushing = new Vector();
-    public Vector startTickClientVel = new Vector();
+    public Vector3D baseTickAddition = newVector3D();
+    public Vector3D baseTickWaterPushing = newVector3D();
+    public Vector3D startTickClientVel = newVector3D();
     // For syncing the player's full swing in 1.9+
     public int movementPackets = 0;
     public VelocityData firstBreadKB = null;
@@ -213,6 +220,9 @@ public class GrimPlayer implements GrimUser {
     }
 
     public int totalFlyingPacketsSent;
+    public boolean hasInventoryOpen;
+    public long lastInventoryOpen;
+    public InventoryDesyncStatus inventoryDesyncStatus;
     public Queue<BlockPlaceSnapshot> placeUseItemPackets = new LinkedBlockingQueue<>();
     // This variable is for support with test servers that want to be able to disable grim
     // Grim disabler 2022 still working!
@@ -326,7 +336,7 @@ public class GrimPlayer implements GrimUser {
         boolean hasID = false;
         int skipped = 0;
         for (Pair<Short, Long> iterator : transactionsSent) {
-            if (iterator.first() == id) {
+            if (iterator.getFirst() == id) {
                 hasID = true;
                 break;
             }
@@ -338,7 +348,7 @@ public class GrimPlayer implements GrimUser {
             if (packetTracker != null) packetTracker.setIntervalPackets(packetTracker.getIntervalPackets() - 1);
 
             if (skipped > 0 && System.currentTimeMillis() - joinTime > 5000)
-                checkManager.getPacketCheck(TransactionOrder.class).flagAndAlert("skipped: " + skipped);
+                checkManager.getPacketCheck(PacketOrderD.class).flagAndAlert("skipped: " + skipped);
 
             do {
                 data = transactionsSent.poll();
@@ -347,9 +357,9 @@ public class GrimPlayer implements GrimUser {
 
                 lastTransactionReceived.incrementAndGet();
                 lastTransReceived = System.currentTimeMillis();
-                transactionPing = (System.nanoTime() - data.second());
-                playerClockAtLeast = data.second();
-            } while (data.first() != id);
+                transactionPing = (System.nanoTime() - data.getSecond());
+                playerClockAtLeast = data.getSecond();
+            } while (data.getFirst() != id);
 
             // A transaction means a new tick, so apply any block places
             CheckManagerListener.handleQueuedPlaces(this, false, 0, 0, System.currentTimeMillis());
@@ -357,18 +367,18 @@ public class GrimPlayer implements GrimUser {
         }
 
         // Were we the ones who sent the packet?
-        return data != null && data.first() == id;
+        return data != null && data.getFirst() == id;
     }
 
-    public void baseTickAddWaterPushing(Vector vector) {
+    public void baseTickAddWaterPushing(ac.grim.grimac.utils.vector.Vector3D vector) {
         baseTickWaterPushing.add(vector);
     }
 
-    public void baseTickAddVector(Vector vector) {
+    public void baseTickAddVector(Vector3D vector) {
         clientVelocity.add(vector);
     }
 
-    public void trackBaseTickAddition(Vector vector) {
+    public void trackBaseTickAddition(Vector3D vector) {
         baseTickAddition.add(vector);
     }
 
@@ -443,7 +453,8 @@ public class GrimPlayer implements GrimUser {
 
     public void disconnect(Component reason) {
         String textReason;
-        if (reason instanceof TranslatableComponent translatableComponent) {
+        if (reason instanceof TranslatableComponent) {
+            TranslatableComponent translatableComponent = (TranslatableComponent) reason;
             textReason = translatableComponent.key();
         } else {
             textReason = LegacyComponentSerializer.legacySection().serialize(reason);

src/main/java/ac/grim/grimac/predictionengine/MovementCheckRunner.java

@@ -38,7 +38,11 @@ import com.github.retrooper.packetevents.protocol.player.GameMode;
 import com.github.retrooper.packetevents.protocol.world.states.WrappedBlockState;
 import com.github.retrooper.packetevents.protocol.world.states.defaulttags.BlockTags;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
+
+import static ac.grim.grimac.utils.data.VectorData.VectorType;
+import static ac.grim.grimac.utils.data.VectorData.VectorType.Dead;
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
 
 public class MovementCheckRunner extends Check implements PositionCheck {
     // Averaged over 500 predictions (Defaults set slightly above my 3600x results)
@@ -138,10 +142,10 @@ public class MovementCheckRunner extends Check implements PositionCheck {
             double negX = Math.min(-0.05, GrimMath.clamp(player.actualMovement.getX(), -16, 16) - 0.05);
             double negZ = Math.min(-0.05, GrimMath.clamp(player.actualMovement.getZ(), -16, 16) - 0.05);
 
-            Vector NE = Collisions.maybeBackOffFromEdge(new Vector(posX, 0, negZ), player, true);
-            Vector NW = Collisions.maybeBackOffFromEdge(new Vector(negX, 0, negZ), player, true);
-            Vector SE = Collisions.maybeBackOffFromEdge(new Vector(posX, 0, posZ), player, true);
-            Vector SW = Collisions.maybeBackOffFromEdge(new Vector(negX, 0, posZ), player, true);
+            Vector3D NE = Collisions.maybeBackOffFromEdge(newVector3D(posX, 0, negZ), player, true);
+            Vector3D NW = Collisions.maybeBackOffFromEdge(newVector3D(negX, 0, negZ), player, true);
+            Vector3D SE = Collisions.maybeBackOffFromEdge(newVector3D(posX, 0, posZ), player, true);
+            Vector3D SW = Collisions.maybeBackOffFromEdge(newVector3D(negX, 0, posZ), player, true);
 
             boolean isEast = NE.getX() != posX || SE.getX() != posX;
             boolean isWest = NW.getX() != negX || SW.getX() != negX;
@@ -184,7 +188,7 @@ public class MovementCheckRunner extends Check implements PositionCheck {
             player.vehicleData.wasVehicleSwitch = false;
 
             if (riding != null) {
-                Vector pos = new Vector(player.x, player.y, player.z);
+                Vector3D pos = newVector3D(player.x, player.y, player.z);
                 SimpleCollisionBox interTruePositions = riding.getPossibleCollisionBoxes();
 
                 // We shrink the expanded bounding box to what the packet positions can be, for a smaller box
@@ -194,7 +198,7 @@ public class MovementCheckRunner extends Check implements PositionCheck {
                 interTruePositions.expand(-width, 0, -width);
                 interTruePositions.expandMax(0, -height, 0);
 
-                Vector cutTo = VectorUtils.cutBoxToVector(pos, interTruePositions);
+                Vector3D cutTo = VectorUtils.cutBoxToVector(pos, interTruePositions);
 
                 // Now we need to simulate a tick starting at the most optimal position
                 // The start position is never sent, so we assume the most optimal start position
@@ -212,14 +216,14 @@ public class MovementCheckRunner extends Check implements PositionCheck {
             } else {
                 // Server always teleports the player when they eject anyways,
                 // so just let the player control where they eject within reason, they get set back anyways
-                if (new Vector(player.lastX, player.lastY, player.lastZ).distance(new Vector(player.x, player.y, player.z)) > 3) {
+                if (newVector3D(player.lastX, player.lastY, player.lastZ).distance(newVector3D(player.x, player.y, player.z)) > 3) {
                     player.getSetbackTeleportUtil().executeForceResync(); // Too far! (I think this value is sane)
                 }
 
                 handleTeleport(update);
 
                 if (player.isClimbing) {
-                    Vector ladder = player.clientVelocity.clone().setY(0.2);
+                    Vector3D ladder = player.clientVelocity.clone().setY(0.2);
                     PredictionEngineNormal.staticVectorEndOfTick(player, ladder);
                     player.lastWasClimbing = ladder.getY();
                 }
@@ -258,7 +262,8 @@ public class MovementCheckRunner extends Check implements PositionCheck {
             // When in control of the entity, the player sets the entity position to their current position
             riding.setPositionRaw(GetBoundingBox.getPacketEntityBoundingBox(player, player.x, player.y, player.z, riding));
 
-            if (riding instanceof PacketEntityTrackXRot boat) {
+            if (riding instanceof PacketEntityTrackXRot) {
+                PacketEntityTrackXRot boat = (PacketEntityTrackXRot) riding;
                 boat.packetYaw = player.xRot;
                 boat.interpYaw = player.xRot;
                 boat.steps = 0;
@@ -299,7 +304,7 @@ public class MovementCheckRunner extends Check implements PositionCheck {
         player.clientControlledVerticalCollision = Math.abs(player.y % (1 / 64D)) < 0.00001;
 
         // This isn't the final velocity of the player in the tick, only the one applied to the player
-        player.actualMovement = new Vector(player.x - player.lastX, player.y - player.lastY, player.z - player.lastZ);
+        player.actualMovement = newVector3D(player.x - player.lastX, player.y - player.lastY, player.z - player.lastZ);
 
         if (player.isSprinting != player.lastSprinting) {
             player.compensatedEntities.hasSprintingAttributeEnabled = player.isSprinting;
@@ -338,7 +343,7 @@ public class MovementCheckRunner extends Check implements PositionCheck {
         boolean clientClaimsRiptide = player.packetStateData.tryingToRiptide;
         if (player.packetStateData.tryingToRiptide) {
             long currentTime = System.currentTimeMillis();
-            boolean isInWater = player.compensatedWorld.isRaining || Collisions.hasMaterial(player, player.boundingBox.copy().expand(0.1f), (block) -> Materials.isWater(CompensatedWorld.blockVersion, block.first()));
+            boolean isInWater = player.compensatedWorld.isRaining || Collisions.hasMaterial(player, player.boundingBox.copy().expand(0.1f), (block) -> Materials.isWater(CompensatedWorld.blockVersion, block.getFirst()));
 
             if (currentTime - player.packetStateData.lastRiptide < 450 || !isInWater) {
                 player.packetStateData.tryingToRiptide = false;
@@ -347,9 +352,9 @@ public class MovementCheckRunner extends Check implements PositionCheck {
             player.packetStateData.lastRiptide = currentTime;
         }
 
-        SimpleCollisionBox steppingOnBB = GetBoundingBox.getCollisionBoxForPlayer(player, player.x, player.y, player.z).expand(player.getMovementThreshold()).offset(0, -1, 0);
+        SimpleCollisionBox steppingOnBB = GetBoundingBox.getCollisionBoxForPlayer(player, player.x, player.y, player.z).expand(0.03).offset(0, -1, 0);
         Collisions.hasMaterial(player, steppingOnBB, (pair) -> {
-            WrappedBlockState data = pair.first();
+            WrappedBlockState data = pair.getFirst();
             if (data.getType() == StateTypes.SLIME_BLOCK && player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_8)) {
                 player.uncertaintyHandler.isSteppingOnSlime = true;
                 player.uncertaintyHandler.isSteppingOnBouncyBlock = true;
@@ -395,8 +400,8 @@ public class MovementCheckRunner extends Check implements PositionCheck {
 
         player.uncertaintyHandler.isNearGlitchyBlock = player.getClientVersion().isOlderThan(ClientVersion.V_1_9)
                 && Collisions.hasMaterial(player, expandedBB.copy().expand(0.2),
-                checkData -> BlockTags.ANVIL.contains(checkData.first().getType())
-                        || checkData.first().getType() == StateTypes.CHEST || checkData.first().getType() == StateTypes.TRAPPED_CHEST);
+                checkData -> BlockTags.ANVIL.contains(checkData.getFirst().getType())
+                        || checkData.getFirst().getType() == StateTypes.CHEST || checkData.getFirst().getType() == StateTypes.TRAPPED_CHEST);
 
         player.uncertaintyHandler.isOrWasNearGlitchyBlock = isGlitchy || player.uncertaintyHandler.isNearGlitchyBlock;
         player.uncertaintyHandler.checkForHardCollision();
@@ -411,8 +416,8 @@ public class MovementCheckRunner extends Check implements PositionCheck {
             player.uncertaintyHandler.lastUnderwaterFlyingHack.reset();
         }
 
-        boolean couldBeStuckSpeed = Collisions.checkStuckSpeed(player, player.getMovementThreshold());
-        boolean couldLeaveStuckSpeed = player.isPointThree() && Collisions.checkStuckSpeed(player, -player.getMovementThreshold());
+        boolean couldBeStuckSpeed = Collisions.checkStuckSpeed(player, 0.03);
+        boolean couldLeaveStuckSpeed = player.isPointThree() && Collisions.checkStuckSpeed(player, -0.03);
         player.uncertaintyHandler.claimingLeftStuckSpeed = !player.compensatedEntities.getSelf().inVehicle() && player.stuckSpeedMultiplier.getX() < 1 && !couldLeaveStuckSpeed;
 
         if (couldBeStuckSpeed) {
@@ -426,8 +431,8 @@ public class MovementCheckRunner extends Check implements PositionCheck {
         // Exempt if the player is dead or is riding a dead entity
         if (player.compensatedEntities.getSelf().isDead || (riding != null && riding.isDead)) {
             // Dead players can't cheat, if you find a way how they could, open an issue
-            player.predictedVelocity = new VectorData(new Vector(), VectorData.VectorType.Dead);
-            player.clientVelocity = new Vector();
+            player.predictedVelocity = new VectorData(newVector3D(), Dead);
+            player.clientVelocity = newVector3D();
         } else if (player.disableGrim || (PacketEvents.getAPI().getServerManager().getVersion().isNewerThanOrEquals(ServerVersion.V_1_8) && player.gamemode == GameMode.SPECTATOR) || player.isFlying) {
             // We could technically check spectator but what's the point...
             // Added complexity to analyze a gamemode used mainly by moderators
@@ -450,7 +455,7 @@ public class MovementCheckRunner extends Check implements PositionCheck {
             // Riptiding while on the ground moves the hitbox upwards before any movement code runs
             // It's a pain to support and this is my best attempt
             if (player.lastOnGround && player.packetStateData.tryingToRiptide && !player.compensatedEntities.getSelf().inVehicle()) {
-                Vector pushingMovement = Collisions.collide(player, 0, 1.1999999F, 0);
+                Vector3D pushingMovement = Collisions.collide(player, 0, 1.1999999F, 0);
                 player.verticalCollision = pushingMovement.getY() != 1.1999999F;
                 double currentY = player.clientVelocity.getY();
 
@@ -462,7 +467,7 @@ public class MovementCheckRunner extends Check implements PositionCheck {
                     player.lastY += pushingMovement.getY();
                     new PlayerBaseTick(player).updatePlayerPose();
                     player.boundingBox = GetBoundingBox.getPlayerBoundingBox(player, player.lastX, player.lastY, player.lastZ);
-                    player.actualMovement = new Vector(player.x - player.lastX, player.y - player.lastY, player.z - player.lastZ);
+                    player.actualMovement = newVector3D(player.x - player.lastX, player.y - player.lastY, player.z - player.lastZ);
 
                     player.couldSkipTick = true;
 
@@ -514,7 +519,7 @@ public class MovementCheckRunner extends Check implements PositionCheck {
         //
         // Checking for oldClientVel being too high fixes BleachHack vertical scaffold
         if (player.getSetbackTeleportUtil().getRequiredSetBack() != null && player.getSetbackTeleportUtil().getRequiredSetBack().getTicksComplete() == 1) {
-            Vector setbackVel = player.getSetbackTeleportUtil().getRequiredSetBack().getVelocity();
+            Vector3D setbackVel = player.getSetbackTeleportUtil().getRequiredSetBack().getVelocity();
             // A player must have velocity going INTO the ground to be able to jump
             // Otherwise they could ignore upwards velocity that isn't useful into more useful upwards velocity (towering)
             // So if they are supposed to be going upwards, or are supposed to be off the ground, resync
@@ -543,7 +548,7 @@ public class MovementCheckRunner extends Check implements PositionCheck {
         // Patch sprint jumping with elytra exploit
         if (player.bukkitPlayer != null && player.isGliding && player.predictedVelocity.isJump() && player.isSprinting && !allowSprintJumpingWithElytra) {
             SetbackTeleportUtil.SetbackPosWithVector lastKnownGoodPosition = player.getSetbackTeleportUtil().lastKnownGoodPosition;
-            lastKnownGoodPosition.setVector(lastKnownGoodPosition.getVector().multiply(new Vector(0.6 * 0.91, 1, 0.6 * 0.91)));
+            lastKnownGoodPosition.setVector(lastKnownGoodPosition.getVector().multiply(newVector3D(0.6 * 0.91, 1, 0.6 * 0.91)));
             player.getSetbackTeleportUtil().executeNonSimulatingSetback();
         }
 
@@ -620,7 +625,7 @@ public class MovementCheckRunner extends Check implements PositionCheck {
      * @param pushingMovement The collision result when trying to move the player upwards by 1.2f
      * @return Whether it is more likely that this player was on the ground the tick they riptided
      */
-    private boolean likelyGroundRiptide(Vector pushingMovement) {
+    private boolean likelyGroundRiptide(Vector3D pushingMovement) {
         // Y velocity gets reset if the player collides vertically
         double riptideYResult = Riptide.getRiptideVelocity(player).getY();
 

src/main/java/ac/grim/grimac/predictionengine/PlayerBaseTick.java

@@ -9,16 +9,19 @@ import ac.grim.grimac.utils.enums.Pose;
 import ac.grim.grimac.utils.latency.CompensatedEntities;
 import ac.grim.grimac.utils.math.GrimMath;
 import ac.grim.grimac.utils.nmsutil.*;
+import ac.grim.grimac.utils.vector.Vector3D;
 import com.github.retrooper.packetevents.protocol.attribute.Attributes;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
 import com.github.retrooper.packetevents.protocol.world.BlockFace;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateType;
 import com.github.retrooper.packetevents.util.Vector3d;
 import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerUpdateAttributes;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.Optional;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 public class PlayerBaseTick {
     GrimPlayer player;
 
@@ -40,11 +43,11 @@ public class PlayerBaseTick {
 
     public void doBaseTick() {
         // Keep track of basetick stuff
-        player.baseTickAddition = new Vector();
-        player.baseTickWaterPushing = new Vector();
+        player.baseTickAddition = newVector3D();
+        player.baseTickWaterPushing = newVector3D();
 
         if (player.isFlying && player.isSneaking && !player.compensatedEntities.getSelf().inVehicle()) {
-            Vector flyingShift = new Vector(0, player.flySpeed * -3, 0);
+            Vector3D flyingShift = newVector3D(0, player.flySpeed * -3, 0);
             player.baseTickAddVector(flyingShift);
             player.trackBaseTickAddition(flyingShift);
         }
@@ -60,7 +63,7 @@ public class PlayerBaseTick {
         // You cannot crouch while flying, only shift - could be specific to 1.14?
         // pre-1.13 clients don't have this code
         if (player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_13) && player.wasTouchingWater && player.isSneaking && !player.isFlying && !player.compensatedEntities.getSelf().inVehicle()) {
-            Vector waterPushVector = new Vector(0, -0.04f, 0);
+            Vector3D waterPushVector = newVector3D(0, -0.04f, 0);
             player.baseTickAddVector(waterPushVector);
             player.trackBaseTickAddition(waterPushVector);
         }
@@ -151,7 +154,7 @@ public class PlayerBaseTick {
 
         // Might be null after respawn?
         final Optional<WrapperPlayServerUpdateAttributes.Property> property = playerSpeed.property();
-        if (property.isEmpty()) return;
+        if (!property.isPresent()) return;
 
         // The client first desync's this attribute
         property.get().getModifiers().removeIf(modifier -> modifier.getUUID().equals(CompensatedEntities.SNOW_MODIFIER_UUID) || modifier.getName().getKey().equals("powder_snow"));
@@ -268,14 +271,13 @@ public class PlayerBaseTick {
 
 
     private void moveTowardsClosestSpace(double xPosition, double zPosition) {
-        double movementThreshold = player.getMovementThreshold();
-        player.boundingBox = player.boundingBox.expand(movementThreshold, 0, movementThreshold); // 0.03... thanks mojang!
+        player.boundingBox = player.boundingBox.expand(0.03, 0, 0.03); // 0.03... thanks mojang!
         if (player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_14)) {
             moveTowardsClosestSpaceModern(xPosition, zPosition);
         } else {
             moveTowardsClosestSpaceLegacy(xPosition, zPosition);
         }
-        player.boundingBox = player.boundingBox.expand(-movementThreshold, 0, -movementThreshold);
+        player.boundingBox = player.boundingBox.expand(-0.03, 0, -0.03);
     }
 
     // Mojang is incompetent and this will push the player out a lot when using elytras
@@ -361,12 +363,22 @@ public class PlayerBaseTick {
             double d7 = direction2 == BlockFace.WEST || direction2 == BlockFace.EAST ? relativeXMovement : relativeZMovement;
             d6 = direction2 == BlockFace.EAST || direction2 == BlockFace.SOUTH ? 1.0 - d7 : d7;
             // d7 and d6 flip the movement direction based on desired movement direction
-            boolean doesSuffocate = switch (direction2) {
-                case EAST -> this.suffocatesAt(blockX + 1, blockZ);
-                case WEST -> this.suffocatesAt(blockX - 1, blockZ);
-                case NORTH -> this.suffocatesAt(blockX, blockZ - 1);
-                default -> this.suffocatesAt(blockX, blockZ + 1);
-            };
+            boolean doesSuffocate;
+            switch (direction2) {
+                case EAST:
+                    doesSuffocate = this.suffocatesAt(blockX + 1, blockZ);
+                    break;
+                case WEST:
+                    doesSuffocate = this.suffocatesAt(blockX - 1, blockZ);
+                    break;
+                case NORTH:
+                    doesSuffocate = this.suffocatesAt(blockX, blockZ - 1);
+                    break;
+                default:
+                case SOUTH:
+                    doesSuffocate = this.suffocatesAt(blockX, blockZ + 1);
+                    break;
+            }
 
             if (d6 >= lowestValue || doesSuffocate) continue;
             lowestValue = d6;
@@ -414,7 +426,7 @@ public class PlayerBaseTick {
         }
 
         boolean hasPushed = false;
-        Vector vec3 = new Vector();
+        Vector3D vec3 = newVector3D();
 
         for (int x = floorX; x < ceilX; ++x) {
             for (int y = floorY; y < ceilY; ++y) {
@@ -464,7 +476,7 @@ public class PlayerBaseTick {
         }
         double d2 = 0.0;
         boolean hasTouched = false;
-        Vector vec3 = new Vector();
+        Vector3D vec3 = newVector3D();
         int n7 = 0;
 
         for (int x = floorX; x < ceilX; ++x) {
@@ -489,7 +501,7 @@ public class PlayerBaseTick {
                     d2 = Math.max(fluidHeightToWorld - aABB.minY, d2);
 
                     if (!player.isFlying) {
-                        Vector vec32 = FluidTypeFlowing.getFlow(player, x, y, z);
+                        Vector3D vec32 = FluidTypeFlowing.getFlow(player, x, y, z);
                         if (d2 < 0.4) {
                             vec32 = vec32.multiply(d2);
                         }

src/main/java/ac/grim/grimac/predictionengine/PointThreeEstimator.java

@@ -1,5 +1,7 @@
 package ac.grim.grimac.predictionengine;
 
+import ac.grim.grimac.checks.impl.combat.Reach;
+import ac.grim.grimac.checks.impl.scaffolding.LineOfSightPlace;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.predictionengine.predictions.PredictionEngine;
 import ac.grim.grimac.utils.collisions.CollisionData;
@@ -16,13 +18,16 @@ import com.github.retrooper.packetevents.protocol.world.states.WrappedBlockState
 import com.github.retrooper.packetevents.protocol.world.states.defaulttags.BlockTags;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateType;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
+import com.github.retrooper.packetevents.util.Vector3i;
 import lombok.Getter;
 import lombok.Setter;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.OptionalInt;
 import java.util.Set;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 /**
  * A lot of care was put into handling all the stupid stuff occurring between events
  * <p>
@@ -104,6 +109,7 @@ public class PointThreeEstimator {
     private boolean isNearHorizontalFlowingLiquid = false; // We can't calculate the direction, only a toggle
     private boolean isNearVerticalFlowingLiquid = false; // We can't calculate exact values, once again a toggle
     private boolean isNearBubbleColumn = false; // We can't calculate exact values once again
+    public boolean isNearNetherPortal = false; // We can't calculate exact values once again
 
     private int maxPositiveLevitation = Integer.MIN_VALUE; // Positive potion effects [0, 128]
     private int minNegativeLevitation = Integer.MAX_VALUE; // Negative potion effects [-127, -1]r
@@ -127,13 +133,12 @@ public class PointThreeEstimator {
 
         // Calculate head hitters.  Take a shortcut by checking if the player doesn't intersect with this block, but does
         // when the player vertically moves upwards by 0.03!  This is equivalent to the move method, but MUCH faster.
-        double movementThreshold = player.getMovementThreshold();
-        SimpleCollisionBox slightlyExpanded = normalBox.copy().expand(movementThreshold, 0, movementThreshold);
-        if (!slightlyExpanded.isIntersected(data) && slightlyExpanded.offset(0, movementThreshold, 0).isIntersected(data)) {
+        SimpleCollisionBox slightlyExpanded = normalBox.copy().expand(0.03, 0, 0.03);
+        if (!slightlyExpanded.isIntersected(data) && slightlyExpanded.offset(0, 0.03, 0).isIntersected(data)) {
             headHitter = true;
         }
 
-        SimpleCollisionBox pointThreeBox = GetBoundingBox.getBoundingBoxFromPosAndSize(player, player.x, player.y - movementThreshold, player.z, 0.66f, 1.86f);
+        SimpleCollisionBox pointThreeBox = GetBoundingBox.getBoundingBoxFromPosAndSize(player, player.x, player.y - 0.03, player.z, 0.66f, 1.86f);
         if ((Materials.isWater(player.getClientVersion(), state) || stateType == StateTypes.LAVA) &&
                 pointThreeBox.isIntersected(new SimpleCollisionBox(x, y, z))) {
 
@@ -141,7 +146,7 @@ public class PointThreeEstimator {
                 isNearBubbleColumn = true;
             }
 
-            Vector fluidVector = FluidTypeFlowing.getFlow(player, x, y, z);
+            Vector3D fluidVector = FluidTypeFlowing.getFlow(player, x, y, z);
             if (fluidVector.getX() != 0 || fluidVector.getZ() != 0) {
                 isNearHorizontalFlowingLiquid = true;
             }
@@ -152,6 +157,10 @@ public class PointThreeEstimator {
             isNearFluid = true;
         }
 
+        player.checkManager.getPacketCheck(Reach.class).handleBlockChange(new Vector3i(x, y, z), state);
+        player.checkManager.getBlockPlaceCheck(LineOfSightPlace.class).handleBlockChange(new Vector3i(x, y, z), state);
+
+
         if (pointThreeBox.isIntersected(new SimpleCollisionBox(x, y, z))) {
             // https://github.com/MWHunter/Grim/issues/613
             int controllingEntityId = player.compensatedEntities.getSelf().inVehicle() ? player.getRidingVehicleId() : player.entityID;
@@ -213,8 +222,7 @@ public class PointThreeEstimator {
     }
 
     public void endOfTickTick() {
-        double movementThreshold = player.getMovementThreshold();
-        SimpleCollisionBox pointThreeBox = GetBoundingBox.getBoundingBoxFromPosAndSize(player, player.x, player.y - movementThreshold, player.z, 0.66f, 1.86f);
+        SimpleCollisionBox pointThreeBox = GetBoundingBox.getBoundingBoxFromPosAndSize(player, player.x, player.y - 0.03, player.z, 0.66f, 1.86f);
 
         // Determine the head hitter using the current Y position
         SimpleCollisionBox oldBB = player.boundingBox;
@@ -224,7 +232,7 @@ public class PointThreeEstimator {
         for (float sizes : (player.skippedTickInActualMovement ? new float[]{0.6f, 1.5f, 1.8f} : new float[]{player.pose.height})) {
             // Try to limit collisions to be as small as possible, for maximum performance
             player.boundingBox = GetBoundingBox.getBoundingBoxFromPosAndSize(player, player.x, player.y + (sizes - 0.01f), player.z, 0.6f, 0.01f);
-            headHitter = headHitter || Collisions.collide(player, 0, movementThreshold, 0).getY() != movementThreshold;
+            headHitter = headHitter || Collisions.collide(player, 0, 0.03, 0).getY() != 0.03;
         }
 
         player.boundingBox = oldBB;
@@ -247,27 +255,32 @@ public class PointThreeEstimator {
         isNearClimbable = false;
         isNearBubbleColumn = false;
         isNearFluid = false;
+        isNearNetherPortal = false;
 
         // Check for flowing water
         Collisions.hasMaterial(player, pointThreeBox, (pair) -> {
-            final WrappedBlockState state = pair.first();
+            final WrappedBlockState state = pair.getFirst();
             final StateType stateType = state.getType();
             if (player.tagManager.block(SyncedTags.CLIMBABLE).contains(stateType) || (stateType == StateTypes.POWDER_SNOW && !player.compensatedEntities.getSelf().inVehicle() && player.getInventory().getBoots().getType() == ItemTypes.LEATHER_BOOTS)) {
                 isNearClimbable = true;
             }
 
             if (BlockTags.TRAPDOORS.contains(stateType)) {
-                isNearClimbable = isNearClimbable || Collisions.trapdoorUsableAsLadder(player, pair.second().getX(), pair.second().getY(), pair.second().getZ(), state);
+                isNearClimbable = isNearClimbable || Collisions.trapdoorUsableAsLadder(player, pair.getSecond().getX(), pair.getSecond().getY(), pair.getSecond().getZ(), state);
             }
 
             if (stateType == StateTypes.BUBBLE_COLUMN) {
                 isNearBubbleColumn = true;
             }
 
-            if (Materials.isWater(player.getClientVersion(), pair.first()) || pair.first().getType() == StateTypes.LAVA) {
+            if (Materials.isWater(player.getClientVersion(), pair.getFirst()) || pair.getFirst().getType() == StateTypes.LAVA) {
                 isNearFluid = true;
             }
 
+            if (state.getType() == StateTypes.NETHER_PORTAL) {
+                isNearNetherPortal = true;
+            }
+
             return false;
         });
     }
@@ -305,7 +318,7 @@ public class PointThreeEstimator {
         player.boundingBox = player.boundingBox.copy().expand(0.03, 0, 0.03).offset(0, 0.03, 0);
         // 0.16 magic value -> 0.03 plus gravity, plus some additional lenience
         double searchDistance = -0.2 + Math.min(0, y);
-        Vector collisionResult = Collisions.collide(player, 0, searchDistance, 0);
+        Vector3D collisionResult = Collisions.collide(player, 0, searchDistance, 0);
         player.boundingBox = playerBox;
         return collisionResult.getY() != searchDistance;
     }
@@ -339,9 +352,9 @@ public class PointThreeEstimator {
         // Takes 0.01 millis, on average, to compute... this should be improved eventually
         for (VectorData data : init) {
             // Try to get the vector as close to zero as possible to give the best chance at 0.03...
-            Vector toZeroVec = new PredictionEngine().handleStartingVelocityUncertainty(player, data, new Vector());
+            Vector3D toZeroVec = new PredictionEngine().handleStartingVelocityUncertainty(player, data, newVector3D());
             // Collide to handle mostly gravity, but other scenarios similar to this.
-            Vector collisionResult = Collisions.collide(player, toZeroVec.getX(), toZeroVec.getY(), toZeroVec.getZ(), Integer.MIN_VALUE, null);
+            Vector3D collisionResult = Collisions.collide(player, toZeroVec.getX(), toZeroVec.getY(), toZeroVec.getZ(), Integer.MIN_VALUE, null);
 
             // If this tick is the tick after y velocity was by 0, a stepping movement is POSSIBLE to have been hidden
             // A bit hacky... is there a better way?  I'm unsure...

src/main/java/ac/grim/grimac/predictionengine/UncertaintyHandler.java

@@ -13,10 +13,12 @@ import ac.grim.grimac.utils.nmsutil.ReachUtils;
 import com.github.retrooper.packetevents.protocol.attribute.Attributes;
 import com.github.retrooper.packetevents.protocol.entity.type.EntityTypes;
 import com.github.retrooper.packetevents.protocol.world.BlockFace;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.*;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 public class UncertaintyHandler {
     private final GrimPlayer player;
     // Handles uncertainty when a piston could have pushed a player in a direction
@@ -147,15 +149,15 @@ public class UncertaintyHandler {
             entityBox.maxY -= height;
             entityBox.expand(-width / 2, 0, -width / 2);
 
-            Vector maxLocation = new Vector(entityBox.maxX, entityBox.maxY, entityBox.maxZ);
-            Vector minLocation = new Vector(entityBox.minX, entityBox.minY, entityBox.minZ);
+            Vector3D maxLocation = newVector3D(entityBox.maxX, entityBox.maxY, entityBox.maxZ);
+            Vector3D minLocation = newVector3D(entityBox.minX, entityBox.minY, entityBox.minZ);
 
-            Vector diff = minLocation.subtract(new Vector(player.lastX, player.lastY + 0.8 * 1.8, player.lastZ)).multiply(0.1);
+            Vector3D diff = minLocation.subtract(newVector3D(player.lastX, player.lastY + 0.8 * 1.8, player.lastZ)).multiply(0.1);
             fishingRodPullBox.minX = Math.min(0, diff.getX());
             fishingRodPullBox.minY = Math.min(0, diff.getY());
             fishingRodPullBox.minZ = Math.min(0, diff.getZ());
 
-            diff = maxLocation.subtract(new Vector(player.lastX, player.lastY + 0.8 * 1.8, player.lastZ)).multiply(0.1);
+            diff = maxLocation.subtract(newVector3D(player.lastX, player.lastY + 0.8 * 1.8, player.lastZ)).multiply(0.1);
             fishingRodPullBox.maxX = Math.max(0, diff.getX());
             fishingRodPullBox.maxY = Math.max(0, diff.getY());
             fishingRodPullBox.maxZ = Math.max(0, diff.getZ());
@@ -170,8 +172,8 @@ public class UncertaintyHandler {
 
         fireworksBox = new SimpleCollisionBox();
 
-        Vector currentLook = ReachUtils.getLook(player, player.xRot, player.yRot);
-        Vector lastLook = ReachUtils.getLook(player, player.lastXRot, player.lastYRot);
+        Vector3D currentLook = ReachUtils.getLook(player, player.xRot, player.yRot);
+        ac.grim.grimac.utils.vector.Vector3D lastLook = ReachUtils.getLook(player, player.lastXRot, player.lastYRot);
 
         double antiTickSkipping = player.isPointThree() ? 0 : 0.05; // With 0.03, let that handle tick skipping
 
@@ -303,7 +305,8 @@ public class UncertaintyHandler {
         // This is the end of that section.
 
         // I can't figure out how the client exactly tracks boost time
-        if (player.compensatedEntities.getSelf().getRiding() instanceof PacketEntityRideable vehicle) {
+        if (player.compensatedEntities.getSelf().getRiding() instanceof PacketEntityRideable) {
+            PacketEntityRideable vehicle = (PacketEntityRideable) player.compensatedEntities.getSelf().getRiding();
             if (vehicle.currentBoostTime < vehicle.boostTimeMax + 20)
                 offset -= 0.01;
         }

src/main/java/ac/grim/grimac/predictionengine/movementtick/MovementTicker.java

@@ -24,7 +24,9 @@ import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
 import com.github.retrooper.packetevents.util.Vector3d;
 import com.viaversion.viaversion.api.Via;
 import io.github.retrooper.packetevents.util.viaversion.ViaVersionUtil;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
+
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
 
 public class MovementTicker {
     public final GrimPlayer player;
@@ -77,9 +79,9 @@ public class MovementTicker {
         player.uncertaintyHandler.collidingEntities.add(possibleCollidingEntities);
     }
 
-    public void move(Vector inputVel, Vector collide) {
+    public void move(Vector3D inputVel, Vector3D collide) {
         if (player.stuckSpeedMultiplier.getX() < 0.99) {
-            player.clientVelocity = new Vector();
+            player.clientVelocity = newVector3D();
         }
 
         if (inputVel.getX() != collide.getX()) {
@@ -172,21 +174,21 @@ public class MovementTicker {
 
         // The game disregards movements smaller than 1e-7 (such as in boats)
         if (collide.lengthSquared() < 1e-7) {
-            collide = new Vector();
+            collide = newVector3D();
         }
 
         // This is where vanilla moves the bounding box and sets it
         player.predictedVelocity = new VectorData(collide.clone(), player.predictedVelocity.lastVector, player.predictedVelocity.vectorType);
 
         float f = BlockProperties.getBlockSpeedFactor(player, player.mainSupportingBlockData, new Vector3d(player.x, player.y, player.z));
-        player.clientVelocity.multiply(new Vector(f, 1, f));
+        player.clientVelocity.multiply(newVector3D(f, 1, f));
 
         // Reset stuck speed so it can update
         if (player.stuckSpeedMultiplier.getX() < 0.99) {
             player.uncertaintyHandler.lastStuckSpeedMultiplier.reset();
         }
 
-        player.stuckSpeedMultiplier = new Vector(1, 1, 1);
+        player.stuckSpeedMultiplier = newVector3D(1, 1, 1);
 
         // 1.15 and older clients use the handleInsideBlocks method for lava
         if (player.getClientVersion().isOlderThan(ClientVersion.V_1_16))
@@ -201,7 +203,7 @@ public class MovementTicker {
 
         // Flying players are not affected by cobwebs/sweet berry bushes
         if (player.isFlying) {
-            player.stuckSpeedMultiplier = new Vector(1, 1, 1);
+            player.stuckSpeedMultiplier = newVector3D(1, 1, 1);
         }
     }
 
@@ -388,14 +390,14 @@ public class MovementTicker {
 
                 // Lava movement changed in 1.16
                 if (player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_16) && player.slightlyTouchingLava) {
-                    player.clientVelocity = player.clientVelocity.multiply(new Vector(0.5D, 0.800000011920929D, 0.5D));
+                    player.clientVelocity = player.clientVelocity.multiply(newVector3D(0.5D, 0.800000011920929D, 0.5D));
                     player.clientVelocity = FluidFallingAdjustedMovement.getFluidFallingAdjustedMovement(player, playerGravity, isFalling, player.clientVelocity);
                 } else {
                     player.clientVelocity.multiply(0.5D);
                 }
 
                 if (player.hasGravity)
-                    player.clientVelocity.add(new Vector(0.0D, -playerGravity / 4.0D, 0.0D));
+                    player.clientVelocity.add(newVector3D(0.0D, -playerGravity / 4.0D, 0.0D));
 
             } else if (player.isGliding) {
                 player.friction = 0.99F; // Not vanilla, just useful for other grim stuff

src/main/java/ac/grim/grimac/predictionengine/movementtick/MovementTickerHorse.java

@@ -5,7 +5,9 @@ import ac.grim.grimac.utils.data.packetentity.PacketEntityHorse;
 import ac.grim.grimac.utils.nmsutil.Collisions;
 import com.github.retrooper.packetevents.protocol.attribute.Attributes;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
+
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
 
 public class MovementTickerHorse extends MovementTickerLivingVehicle {
 
@@ -26,7 +28,7 @@ public class MovementTickerHorse extends MovementTickerLivingVehicle {
             forwardsInput *= 0.25F;
         }
 
-        this.movementInput = new Vector(horizInput, 0, forwardsInput);
+        this.movementInput = newVector3D(horizInput, 0, forwardsInput);
         if (movementInput.lengthSquared() > 1) movementInput.normalize();
     }
 

src/main/java/ac/grim/grimac/predictionengine/movementtick/MovementTickerLivingVehicle.java

@@ -7,10 +7,13 @@ import ac.grim.grimac.predictionengine.predictions.rideable.PredictionEngineRide
 import ac.grim.grimac.predictionengine.predictions.rideable.PredictionEngineRideableWaterLegacy;
 import ac.grim.grimac.utils.nmsutil.BlockProperties;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
+import ac.grim.grimac.utils.vector.Vector3D;
+
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
 
 public class MovementTickerLivingVehicle extends MovementTicker {
-    Vector movementInput = new Vector();
+    Vector3D movementInput = newVector3D();
 
     public MovementTickerLivingVehicle(GrimPlayer player) {
         super(player);

src/main/java/ac/grim/grimac/predictionengine/movementtick/MovementTickerPig.java

@@ -3,12 +3,14 @@ package ac.grim.grimac.predictionengine.movementtick;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.utils.data.packetentity.PacketEntityRideable;
 import com.github.retrooper.packetevents.protocol.attribute.Attributes;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
+
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
 
 public class MovementTickerPig extends MovementTickerRideable {
     public MovementTickerPig(GrimPlayer player) {
         super(player);
-        movementInput = new Vector(0, 0, 1);
+        movementInput = newVector3D(0, 0, 1);
     }
 
     @Override

src/main/java/ac/grim/grimac/predictionengine/movementtick/MovementTickerStrider.java

@@ -11,15 +11,17 @@ import com.github.retrooper.packetevents.protocol.world.states.type.StateType;
 import com.github.retrooper.packetevents.resources.ResourceLocation;
 import com.github.retrooper.packetevents.util.Vector3d;
 import com.github.retrooper.packetevents.wrapper.play.server.WrapperPlayServerUpdateAttributes;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.ArrayList;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 public class MovementTickerStrider extends MovementTickerRideable {
 
     public MovementTickerStrider(GrimPlayer player) {
         super(player);
-        movementInput = new Vector(0, 0, 1);
+        movementInput = newVector3D(0, 0, 1);
     }
 
     public static void floatStrider(GrimPlayer player) {
@@ -27,7 +29,7 @@ public class MovementTickerStrider extends MovementTickerRideable {
             if (isAbove(player) && player.compensatedWorld.getLavaFluidLevelAt((int) Math.floor(player.x), (int) Math.floor(player.y + 1), (int) Math.floor(player.z)) == 0) {
                 player.onGround = true;
             } else {
-                player.clientVelocity.multiply(0.5).add(new Vector(0, 0.05, 0));
+                player.clientVelocity.multiply(0.5).add(newVector3D(0, 0.05, 0));
             }
         }
     }

src/main/java/ac/grim/grimac/predictionengine/predictions/PredictionEngine.java

@@ -11,20 +11,31 @@ import ac.grim.grimac.utils.nmsutil.Collisions;
 import ac.grim.grimac.utils.nmsutil.GetBoundingBox;
 import ac.grim.grimac.utils.nmsutil.JumpPower;
 import ac.grim.grimac.utils.nmsutil.Riptide;
+import ac.grim.grimac.utils.vector.Vector3D;
 import com.github.retrooper.packetevents.protocol.attribute.Attributes;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.*;
 
+import static ac.grim.grimac.utils.data.VectorData.VectorType;
+import static ac.grim.grimac.utils.data.VectorData.VectorType.ZeroPointZeroThree;
+import static ac.grim.grimac.utils.nmsutil.Collisions.isEmpty;
+import static ac.grim.grimac.utils.nmsutil.GetBoundingBox.getBoundingBoxFromPosAndSize;
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+import static com.github.retrooper.packetevents.protocol.attribute.Attributes.GENERIC_GRAVITY;
+import static com.github.retrooper.packetevents.protocol.player.ClientVersion.V_1_13;
+import static java.lang.Math.*;
+import static java.util.Collections.max;
+
 public class PredictionEngine {
 
-    public static Vector clampMovementToHardBorder(GrimPlayer player, Vector outputVel) {
+    public static Vector3D clampMovementToHardBorder(GrimPlayer player, Vector3D outputVel) {
         // TODO: Reimplement
         return outputVel;
     }
 
-    public static Vector transformInputsToVector(GrimPlayer player, Vector theoreticalInput) {
+    public static Vector3D transformInputsToVector(GrimPlayer player, Vector3D theoreticalInput) {
         float bestPossibleX;
         float bestPossibleZ;
 
@@ -42,15 +53,15 @@ public class PredictionEngine {
             bestPossibleZ *= 0.2F;
         }
 
-        Vector inputVector = new Vector(bestPossibleX, 0, bestPossibleZ);
+        Vector3D inputVector = newVector3D(bestPossibleX, 0, bestPossibleZ);
         inputVector.multiply(0.98F);
 
         // Simulate float rounding imprecision
-        inputVector = new Vector((float) inputVector.getX(), (float) inputVector.getY(), (float) inputVector.getZ());
+        inputVector = newVector3D((float) inputVector.getX(), (float) inputVector.getY(), (float) inputVector.getZ());
 
         if (inputVector.lengthSquared() > 1) {
-            double d0 = Math.sqrt(inputVector.getX() * inputVector.getX() + inputVector.getY() * inputVector.getY() + inputVector.getZ() * inputVector.getZ());
-            inputVector = new Vector(inputVector.getX() / d0, inputVector.getY() / d0, inputVector.getZ() / d0);
+            double d0 = sqrt(inputVector.getX() * inputVector.getX() + inputVector.getY() * inputVector.getY() + inputVector.getZ() * inputVector.getZ());
+            inputVector = newVector3D(inputVector.getX() / d0, inputVector.getY() / d0, inputVector.getZ() / d0);
         }
 
         return inputVector;
@@ -62,7 +73,7 @@ public class PredictionEngine {
         if (player.uncertaintyHandler.influencedByBouncyBlock()) {
             for (VectorData data : init) {
                 // Try to get the vector as close to zero as possible to give the best chance at 0.03...
-                Vector toZeroVec = new PredictionEngine().handleStartingVelocityUncertainty(player, data, new Vector(0, -1000000000, 0)); // Downwards without overflow risk
+                Vector3D toZeroVec = new PredictionEngine().handleStartingVelocityUncertainty(player, data, newVector3D(0, -1000000000, 0)); // Downwards without overflow risk
 
                 player.uncertaintyHandler.nextTickSlimeBlockUncertainty = Math.max(Math.abs(toZeroVec.getY()), player.uncertaintyHandler.nextTickSlimeBlockUncertainty);
             }
@@ -105,8 +116,8 @@ public class PredictionEngine {
         double bestInput = Double.MAX_VALUE;
 
         VectorData bestCollisionVel = null;
-        Vector beforeCollisionMovement = null;
-        Vector originalClientVel = player.clientVelocity.clone();
+        Vector3D beforeCollisionMovement = null;
+        Vector3D originalClientVel = player.clientVelocity.clone();
 
         SimpleCollisionBox originalBB = player.boundingBox;
         // 0.03 doesn't exist with vehicles, thank god
@@ -116,9 +127,9 @@ public class PredictionEngine {
         player.skippedTickInActualMovement = false;
 
         for (VectorData clientVelAfterInput : possibleVelocities) {
-            Vector primaryPushMovement = handleStartingVelocityUncertainty(player, clientVelAfterInput, player.actualMovement);
+            Vector3D primaryPushMovement = handleStartingVelocityUncertainty(player, clientVelAfterInput, player.actualMovement);
 
-            Vector bestTheoreticalCollisionResult = VectorUtils.cutBoxToVector(player.actualMovement, new SimpleCollisionBox(0, Math.min(0, primaryPushMovement.getY()), 0, primaryPushMovement.getX(), Math.max(0.6, primaryPushMovement.getY()), primaryPushMovement.getZ()).sort());
+            Vector3D bestTheoreticalCollisionResult = VectorUtils.cutBoxToVector(player.actualMovement, new SimpleCollisionBox(0, Math.min(0, primaryPushMovement.getY()), 0, primaryPushMovement.getX(), Math.max(0.6, primaryPushMovement.getY()), primaryPushMovement.getZ()).sort());
             // Check if this vector could ever possible beat the last vector in terms of accuracy
             // This is quite a good optimization :)
             if (bestTheoreticalCollisionResult.distanceSquared(player.actualMovement) > bestInput && !clientVelAfterInput.isKnockback() && !clientVelAfterInput.isExplosion()) {
@@ -132,9 +143,9 @@ public class PredictionEngine {
             }
 
             // Returns pair of primary push movement, and then outputvel
-            Pair<Vector, Vector> output = doSeekingWallCollisions(player, primaryPushMovement, originalClientVel, clientVelAfterInput);
-            primaryPushMovement = output.first();
-            Vector outputVel = clampMovementToHardBorder(player, output.second());
+            Pair<Vector3D, Vector3D> output = doSeekingWallCollisions(player, primaryPushMovement, originalClientVel, clientVelAfterInput);
+            primaryPushMovement = output.getFirst();
+            Vector3D outputVel = clampMovementToHardBorder(player, output.getSecond());
 
             double resultAccuracy = outputVel.distanceSquared(player.actualMovement);
 
@@ -208,7 +219,7 @@ public class PredictionEngine {
         }
     }
 
-    private Pair<Vector, Vector> doSeekingWallCollisions(GrimPlayer player, Vector primaryPushMovement, Vector originalClientVel, VectorData clientVelAfterInput) {
+    private Pair<Vector3D, Vector3D> doSeekingWallCollisions(GrimPlayer player, Vector3D primaryPushMovement, Vector3D originalClientVel, VectorData clientVelAfterInput) {
         boolean vehicleKB = player.compensatedEntities.getSelf().inVehicle() && clientVelAfterInput.isKnockback() && clientVelAfterInput.vector.getY() == 0;
         // Extra collision epsilon required for vehicles to be accurate
         double xAdditional = Math.signum(primaryPushMovement.getX()) * SimpleCollisionBox.COLLISION_EPSILON;
@@ -221,9 +232,9 @@ public class PredictionEngine {
         double testX = primaryPushMovement.getX() + xAdditional;
         double testY = primaryPushMovement.getY() + yAdditional;
         double testZ = primaryPushMovement.getZ() + zAdditional;
-        primaryPushMovement = new Vector(testX, testY, testZ);
+        primaryPushMovement = newVector3D(testX, testY, testZ);
 
-        Vector outputVel = Collisions.collide(player, primaryPushMovement.getX(), primaryPushMovement.getY(), primaryPushMovement.getZ(), originalClientVel.getY(), clientVelAfterInput);
+        Vector3D outputVel = Collisions.collide(player, primaryPushMovement.getX(), primaryPushMovement.getY(), primaryPushMovement.getZ(), originalClientVel.getY(), clientVelAfterInput);
 
         if (testX == outputVel.getX()) { // the player didn't have X collision, don't ruin offset by collision epsilon
             primaryPushMovement.setX(primaryPushMovement.getX() - xAdditional);
@@ -249,20 +260,20 @@ public class PredictionEngine {
 
         // For now just let the player control their Y velocity within 0.03.  Gravity should stop exploits.
         // 0.03 - 0.784 < -0.03 = can't skip next tick
-        Vector pointThreeVector = new Vector();
+        Vector3D pointThreeVector = newVector3D();
 
         // Stop a bypass (and fix falses) by carrying over the player's current velocity IF they couldn't have modified it
         if (!player.pointThreeEstimator.controlsVerticalMovement()) {
             pointThreeVector.setY(player.clientVelocity.getY());
         } else { // Carry over the current Y velocity to try and help with gravity issues
-            pointThreePossibilities.add(new VectorData(new Vector(0, player.clientVelocity.getY(), 0), VectorData.VectorType.ZeroPointZeroThree));
+            pointThreePossibilities.add(new VectorData(newVector3D(0, player.clientVelocity.getY(), 0), ZeroPointZeroThree));
         }
 
         pointThreePossibilities.add(new VectorData(pointThreeVector, VectorData.VectorType.ZeroPointZeroThree));
 
         // Swim hop
         if (player.pointThreeEstimator.isNearFluid && !Collisions.isEmpty(player, player.boundingBox.copy().expand(0.4, 0, 0.4)) && !player.onGround) { // onGround can still be used here, else generic 0.03
-            pointThreePossibilities.add(new VectorData(new Vector(0, 0.3, 0), VectorData.VectorType.ZeroPointZeroThree));
+            pointThreePossibilities.add(new VectorData(newVector3D(0, 0.3, 0), ZeroPointZeroThree));
         }
 
         // Swimming vertically can add more Y velocity than normal
@@ -279,7 +290,7 @@ public class PredictionEngine {
                 player.clientVelocity.getX(), 0, player.clientVelocity.getZ()).expand(0.5, -SimpleCollisionBox.COLLISION_EPSILON, 0.5)))) {
 
             // Calculate the Y velocity after friction
-            Vector hackyClimbVector = new Vector(0, 0.2, 0);
+            Vector3D hackyClimbVector = newVector3D(0, 0.2, 0);
             PredictionEngineNormal.staticVectorEndOfTick(player, hackyClimbVector);
 
             pointThreePossibilities.add(new VectorData(hackyClimbVector, VectorData.VectorType.ZeroPointZeroThree));
@@ -290,8 +301,8 @@ public class PredictionEngine {
         addExplosionToPossibilities(player, pointThreePossibilities);
 
         if (player.packetStateData.tryingToRiptide) {
-            Vector riptideAddition = Riptide.getRiptideVelocity(player);
-            pointThreePossibilities.add(new VectorData(player.clientVelocity.clone().add(riptideAddition), new VectorData(new Vector(), VectorData.VectorType.ZeroPointZeroThree), VectorData.VectorType.Trident));
+            Vector3D riptideAddition = Riptide.getRiptideVelocity(player);
+            pointThreePossibilities.add(new VectorData(player.clientVelocity.clone().add(riptideAddition), new VectorData(newVector3D(), ZeroPointZeroThree), VectorData.VectorType.Trident));
         }
 
         possibleVelocities.addAll(applyInputsToVelocityPossibilities(player, pointThreePossibilities, speed));
@@ -312,7 +323,7 @@ public class PredictionEngine {
             // Water pushing movement is affected by initial velocity due to 0.003 eating pushing in the past
             if (vectorData.isKnockback() && player.baseTickWaterPushing.lengthSquared() != 0) {
                 if (player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_13)) {
-                    Vector vec3 = player.baseTickWaterPushing.clone();
+                    Vector3D vec3 = player.baseTickWaterPushing.clone();
                     if (Math.abs(vectorData.vector.getX()) < 0.003 && Math.abs(vectorData.vector.getZ()) < 0.003 && player.baseTickWaterPushing.length() < 0.0045000000000000005D) {
                         vec3 = vec3.normalize().multiply(0.0045000000000000005);
                     }
@@ -332,7 +343,7 @@ public class PredictionEngine {
         addExplosionToPossibilities(player, velocities);
 
         if (player.packetStateData.tryingToRiptide) {
-            Vector riptideAddition = Riptide.getRiptideVelocity(player);
+            Vector3D riptideAddition = Riptide.getRiptideVelocity(player);
             velocities.add(new VectorData(player.clientVelocity.clone().add(riptideAddition), VectorData.VectorType.Trident));
         }
 
@@ -361,7 +372,7 @@ public class PredictionEngine {
     private void addAttackSlowToPossibilities(GrimPlayer player, Set<VectorData> velocities) {
         for (int x = 1; x <= Math.min(player.maxPlayerAttackSlow, 5); x++) {
             for (VectorData data : new HashSet<>(velocities)) {
-                velocities.add(data.returnNewModified(data.vector.clone().multiply(new Vector(0.6, 1, 0.6)), VectorData.VectorType.AttackSlow));
+                velocities.add(data.returnNewModified(data.vector.clone().multiply(newVector3D(0.6, 1, 0.6)), VectorData.VectorType.AttackSlow));
             }
         }
     }
@@ -411,52 +422,63 @@ public class PredictionEngine {
         // Order priority (to avoid false positives and false flagging future predictions):
         // Knockback and explosions
         // 0.03 ticks
+        // Movement without input
         // Normal movement
         // First bread knockback and explosions
         // Flagging groundspoof
         // Flagging flip items
         if (a.isExplosion())
-            aScore -= 5;
+            aScore -= 10;
 
         if (a.isKnockback())
-            aScore -= 5;
+            aScore -= 10;
 
         if (b.isExplosion())
-            bScore -= 5;
+            bScore -= 10;
 
         if (b.isKnockback())
-            bScore -= 5;
+            bScore -= 10;
 
         if (a.isFirstBreadExplosion())
-            aScore += 1;
+            aScore += 2;
 
         if (b.isFirstBreadExplosion())
-            bScore += 1;
+            bScore += 2;
 
         if (a.isFirstBreadKb())
-            aScore += 1;
+            aScore += 2;
 
         if (b.isFirstBreadKb())
-            bScore += 1;
+            bScore += 2;
 
         if (a.isFlipItem())
-            aScore += 3;
+            aScore += 6;
 
         if (b.isFlipItem())
-            bScore += 3;
+            bScore += 6;
 
         if (a.isZeroPointZeroThree())
-            aScore -= 1;
+            aScore -= 2;
 
         if (b.isZeroPointZeroThree())
+            bScore -= 2;
+
+        if (a.isWithInput() || a.isJump())
+            aScore += 1;
+        else
+            aScore -= 1;
+
+        if (b.isWithInput() || b.isJump())
+            bScore += 1;
+        else
             bScore -= 1;
 
         // If the player is on the ground but the vector leads the player off the ground
         if ((player.compensatedEntities.getSelf().inVehicle() ? player.clientControlledVerticalCollision : player.onGround) && a.vector.getY() >= 0)
-            aScore += 2;
+            aScore += 4;
 
         if ((player.compensatedEntities.getSelf().inVehicle() ? player.clientControlledVerticalCollision : player.onGround) && b.vector.getY() >= 0)
-            bScore += 2;
+            bScore += 4;
 
         if (aScore != bScore)
             return Integer.compare(aScore, bScore);
@@ -464,15 +486,15 @@ public class PredictionEngine {
         return Double.compare(a.vector.distanceSquared(player.actualMovement), b.vector.distanceSquared(player.actualMovement));
     }
 
-    public Vector handleStartingVelocityUncertainty(GrimPlayer player, VectorData vector, Vector targetVec) {
-        double avgColliding = Collections.max(player.uncertaintyHandler.collidingEntities);
+    public Vector3D handleStartingVelocityUncertainty(GrimPlayer player, VectorData vector, Vector3D targetVec) {
+        double avgColliding = max(player.uncertaintyHandler.collidingEntities);
 
         double additionHorizontal = player.uncertaintyHandler.getOffsetHorizontal(vector);
         double additionVertical = player.uncertaintyHandler.getVerticalOffset(vector);
 
-        double pistonX = Collections.max(player.uncertaintyHandler.pistonX);
-        double pistonY = Collections.max(player.uncertaintyHandler.pistonY);
-        double pistonZ = Collections.max(player.uncertaintyHandler.pistonZ);
+        double pistonX = max(player.uncertaintyHandler.pistonX);
+        double pistonY = max(player.uncertaintyHandler.pistonY);
+        double pistonZ = max(player.uncertaintyHandler.pistonZ);
 
         additionHorizontal += player.uncertaintyHandler.lastHorizontalOffset;
         additionVertical += player.uncertaintyHandler.lastVerticalOffset;
@@ -515,13 +537,13 @@ public class PredictionEngine {
         // 0.075 seems safe?
         //
         // Be somewhat careful as there is an antikb (for horizontal) that relies on this lenience
-        Vector uncertainty = new Vector(avgColliding * 0.08, additionVertical, avgColliding * 0.08);
+        Vector3D uncertainty = newVector3D(avgColliding * 0.08, additionVertical, avgColliding * 0.08);
 
-        Vector min = new Vector(player.uncertaintyHandler.xNegativeUncertainty - additionHorizontal, -bonusY + player.uncertaintyHandler.yNegativeUncertainty, player.uncertaintyHandler.zNegativeUncertainty - additionHorizontal);
-        Vector max = new Vector(player.uncertaintyHandler.xPositiveUncertainty + additionHorizontal, bonusY + player.uncertaintyHandler.yPositiveUncertainty, player.uncertaintyHandler.zPositiveUncertainty + additionHorizontal);
+        Vector3D min = newVector3D(player.uncertaintyHandler.xNegativeUncertainty - additionHorizontal, -bonusY + player.uncertaintyHandler.yNegativeUncertainty, player.uncertaintyHandler.zNegativeUncertainty - additionHorizontal);
+        Vector3D max = newVector3D(player.uncertaintyHandler.xPositiveUncertainty + additionHorizontal, bonusY + player.uncertaintyHandler.yPositiveUncertainty, player.uncertaintyHandler.zPositiveUncertainty + additionHorizontal);
 
-        Vector minVector = vector.vector.clone().add(min.subtract(uncertainty));
-        Vector maxVector = vector.vector.clone().add(max.add(uncertainty));
+        Vector3D minVector = vector.vector.clone().add(min.subtract(uncertainty));
+        Vector3D maxVector = vector.vector.clone().add(max.add(uncertainty));
 
         // Handle the player landing within 0.03 movement, which resets Y velocity
         if (player.uncertaintyHandler.onGroundUncertain && vector.vector.getY() < 0) {
@@ -548,7 +570,7 @@ public class PredictionEngine {
         // We can't simulate the player's Y velocity, unknown number of ticks with a gravity change
         // Feel free to simulate all 104857600000000000000000000 possibilities!
         if (!player.pointThreeEstimator.canPredictNextVerticalMovement()) {
-            minVector.setY(minVector.getY() - player.compensatedEntities.getSelf().getAttributeValue(Attributes.GENERIC_GRAVITY));
+            minVector.setY(minVector.getY() - player.compensatedEntities.getSelf().getAttributeValue(GENERIC_GRAVITY));
         }
 
         // Hidden slime block bounces by missing idle tick and 0.03
@@ -588,9 +610,9 @@ public class PredictionEngine {
         box.maxZ += sneaking.getSneakingPotentialHiddenVelocity().maxZ;
 
         if (player.uncertaintyHandler.fireworksBox != null) {
-            double minXdiff = Math.min(0, player.uncertaintyHandler.fireworksBox.minX - originalVec.vector.getX());
-            double minYdiff = Math.min(0, player.uncertaintyHandler.fireworksBox.minY - originalVec.vector.getY());
-            double minZdiff = Math.min(0, player.uncertaintyHandler.fireworksBox.minZ - originalVec.vector.getZ());
+            double minXdiff = min(0, player.uncertaintyHandler.fireworksBox.minX - originalVec.vector.getX());
+            double minYdiff = min(0, player.uncertaintyHandler.fireworksBox.minY - originalVec.vector.getY());
+            double minZdiff = min(0, player.uncertaintyHandler.fireworksBox.minZ - originalVec.vector.getZ());
             double maxXdiff = Math.max(0, player.uncertaintyHandler.fireworksBox.maxX - originalVec.vector.getX());
             double maxYdiff = Math.max(0, player.uncertaintyHandler.fireworksBox.maxY - originalVec.vector.getY());
             double maxZdiff = Math.max(0, player.uncertaintyHandler.fireworksBox.maxZ - originalVec.vector.getZ());
@@ -646,7 +668,7 @@ public class PredictionEngine {
         //
         // Or the player is switching in and out of controlling a vehicle, in which friction messes it up
         //
-        if (player.uncertaintyHandler.lastVehicleSwitch.hasOccurredSince(0) || player.uncertaintyHandler.lastHardCollidingLerpingEntity.hasOccurredSince(3) || (player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_13) && vector.vector.getY() > 0 && vector.isZeroPointZeroThree() && !Collisions.isEmpty(player, GetBoundingBox.getBoundingBoxFromPosAndSize(player, player.lastX, vector.vector.getY() + player.lastY + 0.6, player.lastZ, 0.6f, 1.26f)))) {
+        if (player.uncertaintyHandler.lastVehicleSwitch.hasOccurredSince(0) || player.uncertaintyHandler.lastHardCollidingLerpingEntity.hasOccurredSince(3) || (player.getClientVersion().isNewerThanOrEquals(V_1_13) && vector.vector.getY() > 0 && vector.isZeroPointZeroThree() && !isEmpty(player, getBoundingBoxFromPosAndSize(player, player.lastX, vector.vector.getY() + player.lastY + 0.6, player.lastZ, 0.6f, 1.26f)))) {
             box.expandToAbsoluteCoordinates(0, 0, 0);
         }
 
@@ -658,9 +680,9 @@ public class PredictionEngine {
             if (player.wasTouchingWater) trueFriction = 0.96;
 
             double maxY = Math.max(box.maxY, box.maxY + ((box.maxY - player.gravity) * 0.91));
-            double minY = Math.min(box.minY, box.minY + ((box.minY - player.gravity) * 0.91));
-            double minX = Math.min(box.minX, box.minX + (-player.speed * trueFriction));
-            double minZ = Math.min(box.minZ, box.minZ + (-player.speed * trueFriction));
+            double minY = min(box.minY, box.minY + ((box.minY - player.gravity) * 0.91));
+            double minX = min(box.minX, box.minX + (-player.speed * trueFriction));
+            double minZ = min(box.minZ, box.minZ + (-player.speed * trueFriction));
             double maxX = Math.max(box.maxX, box.maxX + (player.speed * trueFriction));
             double maxZ = Math.max(box.maxZ, box.maxZ + (player.speed * trueFriction));
 
@@ -676,15 +698,15 @@ public class PredictionEngine {
         maxVector = box.max();
 
         if (pistonX != 0) {
-            minVector.setX(Math.min(minVector.getX() - pistonX, pistonX));
+            minVector.setX(min(minVector.getX() - pistonX, pistonX));
             maxVector.setX(Math.max(maxVector.getX() + pistonX, pistonX));
         }
         if (pistonY != 0) {
-            minVector.setY(Math.min(minVector.getY() - pistonY, pistonY));
+            minVector.setY(min(minVector.getY() - pistonY, pistonY));
             maxVector.setY(Math.max(maxVector.getY() + pistonY, pistonY));
         }
         if (pistonZ != 0) {
-            minVector.setZ(Math.min(minVector.getZ() - pistonZ, pistonZ));
+            minVector.setZ(min(minVector.getZ() - pistonZ, pistonZ));
             maxVector.setZ(Math.max(maxVector.getZ() + pistonZ, pistonZ));
         }
         return VectorUtils.cutBoxToVector(targetVec, minVector, maxVector);
@@ -714,7 +736,7 @@ public class PredictionEngine {
                     if (loopSlowed == 1 && !possibleLastTickOutput.isZeroPointZeroThree()) continue;
                     for (int x = -1; x <= 1; x++) {
                         for (int z = zMin; z <= 1; z++) {
-                            VectorData result = new VectorData(possibleLastTickOutput.vector.clone().add(getMovementResultFromInput(player, transformInputsToVector(player, new Vector(x, 0, z)), speed, player.xRot)), possibleLastTickOutput, VectorData.VectorType.InputResult);
+                            VectorData result = new VectorData.MoveVectorData(possibleLastTickOutput.vector.clone().add(getMovementResultFromInput(player, transformInputsToVector(player, newVector3D(x, 0, z)), speed, player.xRot)), possibleLastTickOutput, VectorData.VectorType.InputResult, x, z);
                             result = result.returnNewModified(result.vector.clone().multiply(player.stuckSpeedMultiplier), VectorData.VectorType.StuckMultiplier);
                             result = result.returnNewModified(handleOnClimbable(result.vector.clone(), player), VectorData.VectorType.Climbable);
                             // Signal that we need to flip sneaking bounding box
@@ -781,21 +803,21 @@ public class PredictionEngine {
 
     // This is just the vanilla equation, which accepts invalid inputs greater than 1
     // We need it because of collision support when a player is using speed
-    public Vector getMovementResultFromInput(GrimPlayer player, Vector inputVector, float f, float f2) {
+    public Vector3D getMovementResultFromInput(GrimPlayer player, Vector3D inputVector, float f, float f2) {
         float f3 = player.trigHandler.sin(f2 * 0.017453292f);
         float f4 = player.trigHandler.cos(f2 * 0.017453292f);
 
         double xResult = inputVector.getX() * f4 - inputVector.getZ() * f3;
         double zResult = inputVector.getZ() * f4 + inputVector.getX() * f3;
 
-        return new Vector(xResult * f, 0, zResult * f);
+        return newVector3D(xResult * f, 0, zResult * f);
     }
 
-    public Vector handleOnClimbable(Vector vector, GrimPlayer player) {
+    public Vector3D handleOnClimbable(Vector3D vector, GrimPlayer player) {
         return vector;
     }
 
-    public void doJump(GrimPlayer player, Vector vector) {
+    public void doJump(GrimPlayer player, Vector3D vector) {
         if (!player.lastOnGround || player.onGround)
             return;
 

src/main/java/ac/grim/grimac/predictionengine/predictions/PredictionEngineElytra.java

@@ -3,28 +3,35 @@ package ac.grim.grimac.predictionengine.predictions;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.utils.data.VectorData;
 import ac.grim.grimac.utils.nmsutil.ReachUtils;
+import ac.grim.grimac.utils.vector.Vector3D;
 import com.github.retrooper.packetevents.protocol.attribute.Attributes;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+import static com.github.retrooper.packetevents.protocol.attribute.Attributes.GENERIC_GRAVITY;
+import static com.github.retrooper.packetevents.protocol.player.ClientVersion.V_1_18_2;
+import static com.github.retrooper.packetevents.protocol.player.ClientVersion.V_1_20_5;
+import static java.lang.Math.*;
+
 public class PredictionEngineElytra extends PredictionEngine {
     // Inputs have no effect on movement
     @Override
     public List<VectorData> applyInputsToVelocityPossibilities(GrimPlayer player, Set<VectorData> possibleVectors, float speed) {
         List<VectorData> results = new ArrayList<>();
-        Vector currentLook = ReachUtils.getLook(player, player.xRot, player.yRot);
+        Vector3D currentLook = ReachUtils.getLook(player, player.xRot, player.yRot);
 
         for (VectorData data : possibleVectors) {
-            Vector elytraResult = getElytraMovement(player, data.vector.clone(), currentLook).multiply(player.stuckSpeedMultiplier).multiply(new Vector(0.99F, 0.98F, 0.99F));
+            Vector3D elytraResult = getElytraMovement(player, data.vector.clone(), currentLook).multiply(player.stuckSpeedMultiplier).multiply(newVector3D(0.99F, 0.98F, 0.99F));
             results.add(data.returnNewModified(elytraResult, VectorData.VectorType.InputResult));
 
             // We must bruteforce Optifine ShitMath
             player.trigHandler.toggleShitMath();
-            elytraResult = getElytraMovement(player, data.vector.clone(), ReachUtils.getLook(player, player.xRot, player.yRot)).multiply(player.stuckSpeedMultiplier).multiply(new Vector(0.99F, 0.98F, 0.99F));
+            elytraResult = getElytraMovement(player, data.vector.clone(), ReachUtils.getLook(player, player.xRot, player.yRot)).multiply(player.stuckSpeedMultiplier).multiply(newVector3D(0.99F, 0.98F, 0.99F));
             player.trigHandler.toggleShitMath();
             results.add(data.returnNewModified(elytraResult, VectorData.VectorType.InputResult));
         }
@@ -32,42 +39,42 @@ public class PredictionEngineElytra extends PredictionEngine {
         return results;
     }
 
-    public static Vector getElytraMovement(GrimPlayer player, Vector vector, Vector lookVector) {
+    public static Vector3D getElytraMovement(GrimPlayer player, Vector3D vector, Vector3D lookVector) {
         float yRotRadians = player.yRot * 0.017453292F;
-        double horizontalSqrt = Math.sqrt(lookVector.getX() * lookVector.getX() + lookVector.getZ() * lookVector.getZ());
+        double horizontalSqrt = sqrt(lookVector.getX() * lookVector.getX() + lookVector.getZ() * lookVector.getZ());
         double horizontalLength = vector.clone().setY(0).length();
         double length = lookVector.length();
 
         // Mojang changed from using their math to using regular java math in 1.18.2 elytra movement
-        double vertCosRotation = player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_18_2) ? Math.cos(yRotRadians) : player.trigHandler.cos(yRotRadians);
-        vertCosRotation = (float) (vertCosRotation * vertCosRotation * Math.min(1.0D, length / 0.4D));
+        double vertCosRotation = player.getClientVersion().isNewerThanOrEquals(V_1_18_2) ? cos(yRotRadians) : player.trigHandler.cos(yRotRadians);
+        vertCosRotation = (float) (vertCosRotation * vertCosRotation * min(1.0D, length / 0.4D));
 
         // So we actually use the player's actual movement to get the gravity/slow falling status
         // However, this is wrong with elytra movement because players can control vertical movement after gravity is calculated
         // Yeah, slow falling needs a refactor in grim.
-        double recalculatedGravity = player.compensatedEntities.getSelf().getAttributeValue(Attributes.GENERIC_GRAVITY);
+        double recalculatedGravity = player.compensatedEntities.getSelf().getAttributeValue(GENERIC_GRAVITY);
         if (player.clientVelocity.getY() <= 0 && player.compensatedEntities.getSlowFallingAmplifier().isPresent()) {
-            recalculatedGravity = player.getClientVersion().isOlderThan(ClientVersion.V_1_20_5) ? 0.01 : Math.min(recalculatedGravity, 0.01);
+            recalculatedGravity = player.getClientVersion().isOlderThan(V_1_20_5) ? 0.01 : min(recalculatedGravity, 0.01);
         }
 
-        vector.add(new Vector(0.0D, recalculatedGravity * (-1.0D + vertCosRotation * 0.75D), 0.0D));
+        vector.add(newVector3D(0.0D, recalculatedGravity * (-1.0D + vertCosRotation * 0.75D), 0.0D));
         double d5;
 
         // Handle slowing the player down when falling
         if (vector.getY() < 0.0D && horizontalSqrt > 0.0D) {
             d5 = vector.getY() * -0.1D * vertCosRotation;
-            vector.add(new Vector(lookVector.getX() * d5 / horizontalSqrt, d5, lookVector.getZ() * d5 / horizontalSqrt));
+            vector.add(newVector3D(lookVector.getX() * d5 / horizontalSqrt, d5, lookVector.getZ() * d5 / horizontalSqrt));
         }
 
         // Handle accelerating the player when they are looking down
         if (yRotRadians < 0.0F && horizontalSqrt > 0.0D) {
             d5 = horizontalLength * (double) (-player.trigHandler.sin(yRotRadians)) * 0.04D;
-            vector.add(new Vector(-lookVector.getX() * d5 / horizontalSqrt, d5 * 3.2D, -lookVector.getZ() * d5 / horizontalSqrt));
+            vector.add(newVector3D(-lookVector.getX() * d5 / horizontalSqrt, d5 * 3.2D, -lookVector.getZ() * d5 / horizontalSqrt));
         }
 
         // Handle accelerating the player sideways
         if (horizontalSqrt > 0) {
-            vector.add(new Vector((lookVector.getX() / horizontalSqrt * horizontalLength - vector.getX()) * 0.1D, 0.0D, (lookVector.getZ() / horizontalSqrt * horizontalLength - vector.getZ()) * 0.1D));
+            vector.add(newVector3D((lookVector.getX() / horizontalSqrt * horizontalLength - vector.getX()) * 0.1D, 0.0D, (lookVector.getZ() / horizontalSqrt * horizontalLength - vector.getZ()) * 0.1D));
         }
 
         return vector;

src/main/java/ac/grim/grimac/predictionengine/predictions/PredictionEngineLava.java

@@ -3,11 +3,13 @@ package ac.grim.grimac.predictionengine.predictions;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.utils.data.VectorData;
 import ac.grim.grimac.utils.math.GrimMath;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.HashSet;
 import java.util.Set;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 public class PredictionEngineLava extends PredictionEngine {
     @Override
     public void addJumpsToPossibilities(GrimPlayer player, Set<VectorData> existingVelocities) {
@@ -16,11 +18,11 @@ public class PredictionEngineLava extends PredictionEngine {
                 double extraVelFromVertTickSkipUpwards = GrimMath.clamp(player.actualMovement.getY(), vector.vector.clone().getY(), vector.vector.clone().getY() + 0.05f);
                 existingVelocities.add(new VectorData(vector.vector.clone().setY(extraVelFromVertTickSkipUpwards), vector, VectorData.VectorType.Jump));
             } else {
-                existingVelocities.add(new VectorData(vector.vector.clone().add(new Vector(0, 0.04f, 0)), vector, VectorData.VectorType.Jump));
+                existingVelocities.add(new VectorData(vector.vector.clone().add(newVector3D(0, 0.04f, 0)), vector, VectorData.VectorType.Jump));
             }
 
             if (player.slightlyTouchingLava && player.lastOnGround && !player.onGround) {
-                Vector withJump = vector.vector.clone();
+                Vector3D withJump = vector.vector.clone();
                 super.doJump(player, withJump);
                 existingVelocities.add(new VectorData(withJump, vector, VectorData.VectorType.Jump));
             }

src/main/java/ac/grim/grimac/predictionengine/predictions/PredictionEngineNormal.java

@@ -6,20 +6,26 @@ import ac.grim.grimac.utils.data.VectorData;
 import ac.grim.grimac.utils.math.GrimMath;
 import ac.grim.grimac.utils.nmsutil.Collisions;
 import ac.grim.grimac.utils.nmsutil.JumpPower;
+import ac.grim.grimac.utils.vector.Vector3D;
 import com.github.retrooper.packetevents.protocol.item.ItemStack;
 import com.github.retrooper.packetevents.protocol.item.type.ItemTypes;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
 import com.github.retrooper.packetevents.protocol.potion.PotionTypes;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.HashSet;
 import java.util.OptionalInt;
 import java.util.Set;
 
+import static ac.grim.grimac.utils.math.GrimMath.clamp;
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+import static com.github.retrooper.packetevents.protocol.world.states.type.StateTypes.SCAFFOLDING;
+import static java.lang.Math.max;
+
 public class PredictionEngineNormal extends PredictionEngine {
 
-    public static void staticVectorEndOfTick(GrimPlayer player, Vector vector) {
+    public static void staticVectorEndOfTick(GrimPlayer player, Vector3D vector) {
         double adjustedY = vector.getY();
         final OptionalInt levitation = player.compensatedEntities.getPotionLevelForPlayer(PotionTypes.LEVITATION);
         if (levitation.isPresent()) {
@@ -38,7 +44,7 @@ public class PredictionEngineNormal extends PredictionEngine {
     @Override
     public void addJumpsToPossibilities(GrimPlayer player, Set<VectorData> existingVelocities) {
         for (VectorData vector : new HashSet<>(existingVelocities)) {
-            Vector jump = vector.vector.clone();
+            Vector3D jump = vector.vector.clone();
 
             if (!player.isFlying) {
                 // Negative jump boost does not allow the player to leave the ground
@@ -47,14 +53,14 @@ public class PredictionEngineNormal extends PredictionEngine {
                 // And 0.03 didn't affect onGround status
                 // The player cannot jump
                 final OptionalInt jumpBoost = player.compensatedEntities.getPotionLevelForPlayer(PotionTypes.JUMP_BOOST);
-                if (((jumpBoost.isEmpty() || jumpBoost.getAsInt() >= 0) && player.onGround) || !player.lastOnGround)
+                if (((!jumpBoost.isPresent() || jumpBoost.getAsInt() >= 0) && player.onGround) || !player.lastOnGround)
                     return;
 
                 JumpPower.jumpFromGround(player, jump);
             } else {
-                jump.add(new Vector(0, player.flySpeed * 3, 0));
+                jump.add(newVector3D(0, player.flySpeed * 3, 0));
                 if (!player.wasFlying) {
-                    Vector edgeCaseJump = jump.clone();
+                    Vector3D edgeCaseJump = jump.clone();
                     JumpPower.jumpFromGround(player, edgeCaseJump);
                     existingVelocities.add(vector.returnNewModified(edgeCaseJump, VectorData.VectorType.Jump));
                 }
@@ -82,7 +88,7 @@ public class PredictionEngineNormal extends PredictionEngine {
         if (player.lastWasClimbing == 0 && (player.pointThreeEstimator.isNearClimbable() || player.isClimbing) && (player.getClientVersion().isNewerThanOrEquals(ClientVersion.V_1_14)
                 || !Collisions.isEmpty(player, player.boundingBox.copy().expand(
                 player.clientVelocity.getX(), 0, player.clientVelocity.getZ()).expand(0.5, -SimpleCollisionBox.COLLISION_EPSILON, 0.5))) || walkingOnPowderSnow) {
-            Vector ladderVelocity = player.clientVelocity.clone().setY(0.2);
+            Vector3D ladderVelocity = player.clientVelocity.clone().setY(0.2);
             staticVectorEndOfTick(player, ladderVelocity);
             player.lastWasClimbing = ladderVelocity.getY();
         }
@@ -93,17 +99,17 @@ public class PredictionEngineNormal extends PredictionEngine {
     }
 
     @Override
-    public Vector handleOnClimbable(Vector vector, GrimPlayer player) {
+    public Vector3D handleOnClimbable(Vector3D vector, GrimPlayer player) {
         if (player.isClimbing) {
             // Reset fall distance when climbing
             player.fallDistance = 0;
 
-            vector.setX(GrimMath.clamp(vector.getX(), -0.15F, 0.15F));
-            vector.setZ(GrimMath.clamp(vector.getZ(), -0.15F, 0.15F));
-            vector.setY(Math.max(vector.getY(), -0.15F));
+            vector.setX(clamp(vector.getX(), -0.15F, 0.15F));
+            vector.setZ(clamp(vector.getZ(), -0.15F, 0.15F));
+            vector.setY(max(vector.getY(), -0.15F));
 
             // Yes, this uses shifting not crouching
-            if (vector.getY() < 0.0 && !(player.compensatedWorld.getStateTypeAt(player.lastX, player.lastY, player.lastZ) == StateTypes.SCAFFOLDING) && player.isSneaking && !player.isFlying) {
+            if (vector.getY() < 0.0 && !(player.compensatedWorld.getStateTypeAt(player.lastX, player.lastY, player.lastZ) == SCAFFOLDING) && player.isSneaking && !player.isFlying) {
                 vector.setY(0.0);
             }
         }

src/main/java/ac/grim/grimac/predictionengine/predictions/PredictionEngineWater.java

@@ -9,11 +9,15 @@ import ac.grim.grimac.utils.nmsutil.Collisions;
 import ac.grim.grimac.utils.nmsutil.FluidFallingAdjustedMovement;
 import ac.grim.grimac.utils.nmsutil.ReachUtils;
 import com.github.retrooper.packetevents.protocol.player.ClientVersion;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.HashSet;
 import java.util.Set;
 
+import static ac.grim.grimac.utils.data.VectorData.VectorType;
+import static ac.grim.grimac.utils.data.VectorData.VectorType.SwimmingSpace;
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 public class PredictionEngineWater extends PredictionEngine {
     boolean isFalling;
     double playerGravity;
@@ -21,9 +25,9 @@ public class PredictionEngineWater extends PredictionEngine {
     float swimmingFriction;
     double lastY;
 
-    public static void staticVectorEndOfTick(GrimPlayer player, Vector vector, float swimmingFriction, double playerGravity, boolean isFalling) {
-        vector.multiply(new Vector(swimmingFriction, 0.8F, swimmingFriction));
-        Vector fluidVector = FluidFallingAdjustedMovement.getFluidFallingAdjustedMovement(player, playerGravity, isFalling, vector);
+    public static void staticVectorEndOfTick(GrimPlayer player, Vector3D vector, float swimmingFriction, double playerGravity, boolean isFalling) {
+        vector.multiply(newVector3D(swimmingFriction, 0.8F, swimmingFriction));
+        Vector3D fluidVector = FluidFallingAdjustedMovement.getFluidFallingAdjustedMovement(player, playerGravity, isFalling, vector);
         vector.setX(fluidVector.getX());
         vector.setY(fluidVector.getY());
         vector.setZ(fluidVector.getZ());
@@ -47,7 +51,7 @@ public class PredictionEngineWater extends PredictionEngine {
                 double scalar = lookYAmount < -0.2 ? 0.085 : 0.06;
 
                 // The player can always press jump and activate this
-                swimmingVelocities.add(vector.returnNewModified(new Vector(vector.vector.getX(), vector.vector.getY() + ((lookYAmount - vector.vector.getY()) * scalar), vector.vector.getZ()), VectorData.VectorType.SwimmingSpace));
+                swimmingVelocities.add(vector.returnNewModified(newVector3D(vector.vector.getX(), vector.vector.getY() + ((lookYAmount - vector.vector.getY()) * scalar), vector.vector.getZ()), SwimmingSpace));
 
                 // This scenario will occur if the player does not press jump and the other conditions are met
                 // Theoretically we should check this BEFORE allowing no look, but there isn't a cheat that takes advantage of this yet
@@ -80,11 +84,11 @@ public class PredictionEngineWater extends PredictionEngine {
                 double extraVelFromVertTickSkipUpwards = GrimMath.clamp(player.actualMovement.getY(), vector.vector.clone().getY(), vector.vector.clone().getY() + 0.05f);
                 existingVelocities.add(new VectorData(vector.vector.clone().setY(extraVelFromVertTickSkipUpwards), vector, VectorData.VectorType.Jump));
             } else {
-                existingVelocities.add(new VectorData(vector.vector.clone().add(new Vector(0, 0.04f, 0)), vector, VectorData.VectorType.Jump));
+                existingVelocities.add(new VectorData(vector.vector.clone().add(newVector3D(0, 0.04f, 0)), vector, VectorData.VectorType.Jump));
             }
 
             if (player.slightlyTouchingWater && player.lastOnGround && !player.onGround) {
-                Vector withJump = vector.vector.clone();
+                Vector3D withJump = vector.vector.clone();
                 super.doJump(player, withJump);
                 existingVelocities.add(new VectorData(withJump, vector, VectorData.VectorType.Jump));
             }

src/main/java/ac/grim/grimac/predictionengine/predictions/PredictionEngineWaterLegacy.java

@@ -2,11 +2,15 @@ package ac.grim.grimac.predictionengine.predictions;
 
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.utils.data.VectorData;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.HashSet;
 import java.util.Set;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+import static java.lang.Math.sqrt;
+
 public class PredictionEngineWaterLegacy extends PredictionEngine {
     double playerGravity;
     float swimmingSpeed;
@@ -23,11 +27,11 @@ public class PredictionEngineWaterLegacy extends PredictionEngine {
 
     // This is just the vanilla equation for legacy water movement
     @Override
-    public Vector getMovementResultFromInput(GrimPlayer player, Vector inputVector, float f, float f2) {
+    public Vector3D getMovementResultFromInput(GrimPlayer player, Vector3D inputVector, float f, float f2) {
         float lengthSquared = (float) inputVector.lengthSquared();
 
         if (lengthSquared >= 1.0E-4F) {
-            lengthSquared = (float) Math.sqrt(lengthSquared);
+            lengthSquared = (float) sqrt(lengthSquared);
 
             if (lengthSquared < 1.0F) {
                 lengthSquared = 1.0F;
@@ -38,21 +42,20 @@ public class PredictionEngineWaterLegacy extends PredictionEngine {
             float sinResult = player.trigHandler.sin(player.xRot * 0.017453292F);
             float cosResult = player.trigHandler.cos(player.xRot * 0.017453292F);
 
-            return new Vector(inputVector.getX() * cosResult - inputVector.getZ() * sinResult,
-                    inputVector.getY(), inputVector.getZ() * cosResult + inputVector.getX() * sinResult);
+            return newVector3D(inputVector.getX() * cosResult - inputVector.getZ() * sinResult, inputVector.getY(), inputVector.getZ() * cosResult + inputVector.getX() * sinResult);
         }
 
-        return new Vector();
+        return newVector3D();
     }
 
 
     @Override
     public void addJumpsToPossibilities(GrimPlayer player, Set<VectorData> existingVelocities) {
         for (VectorData vector : new HashSet<>(existingVelocities)) {
-            existingVelocities.add(new VectorData(vector.vector.clone().add(new Vector(0, 0.04f, 0)), vector, VectorData.VectorType.Jump));
+            existingVelocities.add(new VectorData(vector.vector.clone().add(newVector3D(0, 0.04f, 0)), vector, VectorData.VectorType.Jump));
 
             if (player.skippedTickInActualMovement) {
-                existingVelocities.add(new VectorData(vector.vector.clone().add(new Vector(0, 0.02f, 0)), vector, VectorData.VectorType.Jump));
+                existingVelocities.add(new VectorData(vector.vector.clone().add(newVector3D(0, 0.02f, 0)), vector, VectorData.VectorType.Jump));
             }
         }
     }
@@ -62,7 +65,7 @@ public class PredictionEngineWaterLegacy extends PredictionEngine {
         super.endOfTick(player, playerGravity);
 
         for (VectorData vector : player.getPossibleVelocitiesMinusKnockback()) {
-            vector.vector.multiply(new Vector(swimmingFriction, 0.8F, swimmingFriction));
+            vector.vector.multiply(newVector3D(swimmingFriction, 0.8F, swimmingFriction));
 
             // Gravity
             vector.vector.setY(vector.vector.getY() - 0.02D);

src/main/java/ac/grim/grimac/predictionengine/predictions/rideable/BoatPredictionEngine.java

@@ -13,12 +13,15 @@ import ac.grim.grimac.utils.nmsutil.GetBoundingBox;
 import com.github.retrooper.packetevents.protocol.world.states.WrappedBlockState;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateType;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Set;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+import static java.lang.Math.PI;
+
 public class BoatPredictionEngine extends PredictionEngine {
     public BoatPredictionEngine(GrimPlayer player) {
         player.uncertaintyHandler.collidingEntities.add(0); // We don't do collisions like living entities
@@ -147,7 +150,7 @@ public class BoatPredictionEngine extends PredictionEngine {
             // so if a player tries to move in both directions, a packet will
             // show that the player is staying, but the boat will move anyway
             if (player.vehicleData.vehicleForward == 0) {
-                Vector vector = data.vector.clone();
+                Vector3D vector = data.vector.clone();
                 controlBoat(player, vector, true);
                 vector.multiply(player.stuckSpeedMultiplier);
                 vectors.add(data.returnNewModified(vector, VectorData.VectorType.InputResult));
@@ -184,7 +187,7 @@ public class BoatPredictionEngine extends PredictionEngine {
         return false;
     }
 
-    private void floatBoat(GrimPlayer player, Vector vector) {
+    private void floatBoat(GrimPlayer player, Vector3D vector) {
         double d1 = player.hasGravity ? -0.04f : 0;
         double d2 = 0.0D;
         float invFriction = 0.05F;
@@ -194,7 +197,7 @@ public class BoatPredictionEngine extends PredictionEngine {
 
             player.lastY = getWaterLevelAbove(player) - 0.5625F + 0.101D;
             player.boundingBox = GetBoundingBox.getCollisionBoxForPlayer(player, player.lastX, player.lastY, player.lastZ);
-            player.actualMovement = new Vector(player.x - player.lastX, player.y - player.lastY, player.z - player.lastZ);
+            player.actualMovement = newVector3D(player.x - player.lastX, player.y - player.lastY, player.z - player.lastZ);
             vector.setY(0);
 
             player.vehicleData.lastYd = 0.0D;
@@ -260,7 +263,7 @@ public class BoatPredictionEngine extends PredictionEngine {
         return (float) (l + 1);
     }
 
-    private void controlBoat(GrimPlayer player, Vector vector, boolean intermediate) {
+    private void controlBoat(GrimPlayer player, Vector3D vector, boolean intermediate) {
         float f = 0.0F;
         if (player.vehicleData.vehicleHorizontal != 0 && (!intermediate && player.vehicleData.vehicleForward == 0)) {
             f += 0.005F;
@@ -275,6 +278,6 @@ public class BoatPredictionEngine extends PredictionEngine {
             f -= 0.005F;
         }
 
-        vector.add(new Vector(player.trigHandler.sin(-player.xRot * ((float) Math.PI / 180F)) * f, 0, (double) (player.trigHandler.cos(player.xRot * ((float) Math.PI / 180F)) * f)));
+        vector.add(newVector3D(player.trigHandler.sin(-player.xRot * ((float) PI / 180F)) * f, 0, (double) (player.trigHandler.cos(player.xRot * ((float) PI / 180F)) * f)));
     }
 }

src/main/java/ac/grim/grimac/predictionengine/predictions/rideable/PredictionEngineRideableLava.java

@@ -3,16 +3,16 @@ package ac.grim.grimac.predictionengine.predictions.rideable;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.predictionengine.predictions.PredictionEngineLava;
 import ac.grim.grimac.utils.data.VectorData;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.List;
 import java.util.Set;
 
 public class PredictionEngineRideableLava extends PredictionEngineLava {
 
-    Vector movementVector;
+    Vector3D movementVector;
 
-    public PredictionEngineRideableLava(Vector movementVector) {
+    public PredictionEngineRideableLava(Vector3D movementVector) {
         this.movementVector = movementVector;
     }
 

src/main/java/ac/grim/grimac/predictionengine/predictions/rideable/PredictionEngineRideableNormal.java

@@ -3,16 +3,16 @@ package ac.grim.grimac.predictionengine.predictions.rideable;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.predictionengine.predictions.PredictionEngineNormal;
 import ac.grim.grimac.utils.data.VectorData;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.List;
 import java.util.Set;
 
 public class PredictionEngineRideableNormal extends PredictionEngineNormal {
 
-    Vector movementVector;
+    Vector3D movementVector;
 
-    public PredictionEngineRideableNormal(Vector movementVector) {
+    public PredictionEngineRideableNormal(Vector3D movementVector) {
         this.movementVector = movementVector;
     }
 

src/main/java/ac/grim/grimac/predictionengine/predictions/rideable/PredictionEngineRideableUtils.java

@@ -8,16 +8,20 @@ import ac.grim.grimac.utils.data.packetentity.PacketEntityHorse;
 import ac.grim.grimac.utils.nmsutil.JumpPower;
 import com.github.retrooper.packetevents.protocol.attribute.Attributes;
 import com.github.retrooper.packetevents.protocol.potion.PotionTypes;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.OptionalInt;
 import java.util.Set;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 public class PredictionEngineRideableUtils {
     public static Set<VectorData> handleJumps(GrimPlayer player, Set<VectorData> possibleVectors) {
-        if (!(player.compensatedEntities.getSelf().getRiding() instanceof PacketEntityHorse horse)) return possibleVectors;
+        if (!(player.compensatedEntities.getSelf().getRiding() instanceof PacketEntityHorse)) return possibleVectors;
+
+        PacketEntityHorse horse = (PacketEntityHorse) player.compensatedEntities.getSelf().getRiding();
 
         // Setup player inputs
         float f = player.vehicleData.vehicleHorizontal * 0.5F;
@@ -55,7 +59,7 @@ public class PredictionEngineRideableUtils {
             for (VectorData vectorData : possibleVectors) {
                 vectorData.vector.setY(d1);
                 if (f1 > 0.0F) {
-                    vectorData.vector.add(new Vector(-0.4F * f2 * player.vehicleData.horseJump, 0.0D, 0.4F * f3 * player.vehicleData.horseJump));
+                    vectorData.vector.add(newVector3D(-0.4F * f2 * player.vehicleData.horseJump, 0.0D, 0.4F * f3 * player.vehicleData.horseJump));
                 }
             }
 
@@ -71,7 +75,7 @@ public class PredictionEngineRideableUtils {
         return possibleVectors;
     }
 
-    public static List<VectorData> applyInputsToVelocityPossibilities(Vector movementVector, GrimPlayer player, Set<VectorData> possibleVectors, float speed) {
+    public static List<VectorData> applyInputsToVelocityPossibilities(Vector3D movementVector, GrimPlayer player, Set<VectorData> possibleVectors, float speed) {
         List<VectorData> returnVectors = new ArrayList<>();
 
         for (VectorData possibleLastTickOutput : possibleVectors) {

src/main/java/ac/grim/grimac/predictionengine/predictions/rideable/PredictionEngineRideableWater.java

@@ -3,16 +3,16 @@ package ac.grim.grimac.predictionengine.predictions.rideable;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.predictionengine.predictions.PredictionEngineWater;
 import ac.grim.grimac.utils.data.VectorData;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.List;
 import java.util.Set;
 
 public class PredictionEngineRideableWater extends PredictionEngineWater {
 
-    Vector movementVector;
+    Vector3D movementVector;
 
-    public PredictionEngineRideableWater(Vector movementVector) {
+    public PredictionEngineRideableWater(Vector3D movementVector) {
         this.movementVector = movementVector;
     }
 

src/main/java/ac/grim/grimac/predictionengine/predictions/rideable/PredictionEngineRideableWaterLegacy.java

@@ -3,15 +3,15 @@ package ac.grim.grimac.predictionengine.predictions.rideable;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.predictionengine.predictions.PredictionEngineWaterLegacy;
 import ac.grim.grimac.utils.data.VectorData;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.List;
 import java.util.Set;
 
 public class PredictionEngineRideableWaterLegacy extends PredictionEngineWaterLegacy {
-    Vector movementVector;
+    Vector3D movementVector;
 
-    public PredictionEngineRideableWaterLegacy(Vector movementVector) {
+    public PredictionEngineRideableWaterLegacy(Vector3D movementVector) {
         this.movementVector = movementVector;
     }
 

src/main/java/ac/grim/grimac/utils/anticheat/update/BlockPlace.java

@@ -17,6 +17,7 @@ import ac.grim.grimac.utils.nmsutil.BoundingBoxSize;
 import ac.grim.grimac.utils.nmsutil.GetBoundingBox;
 import ac.grim.grimac.utils.nmsutil.Materials;
 import ac.grim.grimac.utils.nmsutil.ReachUtils;
+import ac.grim.grimac.utils.vector.Vector3D;
 import com.github.retrooper.packetevents.PacketEvents;
 import com.github.retrooper.packetevents.manager.server.ServerVersion;
 import com.github.retrooper.packetevents.protocol.attribute.Attributes;
@@ -35,18 +36,23 @@ import com.github.retrooper.packetevents.util.Vector3f;
 import com.github.retrooper.packetevents.util.Vector3i;
 import lombok.Getter;
 import lombok.Setter;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.Arrays;
 import java.util.List;
 
+import static ac.grim.grimac.utils.nmsutil.ReachUtils.calculateIntercept;
+import static ac.grim.grimac.utils.nmsutil.ReachUtils.getLook;
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+import static com.github.retrooper.packetevents.protocol.attribute.Attributes.PLAYER_BLOCK_INTERACTION_RANGE;
+
 public class BlockPlace {
     protected static final BlockFace[] UPDATE_SHAPE_ORDER = new BlockFace[]{BlockFace.WEST, BlockFace.EAST, BlockFace.NORTH, BlockFace.SOUTH, BlockFace.DOWN, BlockFace.UP};
     private static final BlockFace[] BY_2D = new BlockFace[]{BlockFace.SOUTH, BlockFace.WEST, BlockFace.NORTH, BlockFace.EAST};
     static final BlockFace[] BY_3D = new BlockFace[]{BlockFace.DOWN, BlockFace.UP, BlockFace.NORTH, BlockFace.SOUTH, BlockFace.WEST, BlockFace.EAST};
     @Setter
-    Vector3i blockPosition;
+    public Vector3i blockPosition;
     @Getter
     InteractionHand hand;
     @Getter
@@ -540,14 +546,21 @@ public class BlockPlace {
     }
 
     public Vector3i getNormalBlockFace() {
-        return switch (face) {
-            case DOWN -> new Vector3i(0, -1, 0);
-            case SOUTH -> new Vector3i(0, 0, 1);
-            case NORTH -> new Vector3i(0, 0, -1);
-            case WEST -> new Vector3i(-1, 0, 0);
-            case EAST -> new Vector3i(1, 0, 0);
-            default -> new Vector3i(0, 1, 0);
-        };
+        switch (face) {
+            default:
+            case UP:
+                return new Vector3i(0, 1, 0);
+            case DOWN:
+                return new Vector3i(0, -1, 0);
+            case SOUTH:
+                return new Vector3i(0, 0, 1);
+            case NORTH:
+                return new Vector3i(0, 0, -1);
+            case WEST:
+                return new Vector3i(-1, 0, 0);
+            case EAST:
+                return new Vector3i(1, 0, 0);
+        }
     }
 
     public void set(StateType material) {
@@ -661,18 +674,18 @@ public class BlockPlace {
     // You also have the desync caused by eye height as apparently tracking the player's ticks wasn't important to you
     // No mojang, you really do need to track client ticks to get their accurate eye height.
     // another damn desync added... maybe next decade it will get fixed and double the amount of issues.
-    public Vector getClickedLocation() {
+    public Vector3D getClickedLocation() {
         SimpleCollisionBox box = new SimpleCollisionBox(getPlacedAgainstBlockLocation());
-        Vector look = ReachUtils.getLook(player, player.xRot, player.yRot);
+        Vector3D look = getLook(player, player.xRot, player.yRot);
 
-        final double distance = player.compensatedEntities.getSelf().getAttributeValue(Attributes.PLAYER_BLOCK_INTERACTION_RANGE) + 3;
-        Vector eyePos = new Vector(player.x, player.y + player.getEyeHeight(), player.z);
-        Vector endReachPos = eyePos.clone().add(new Vector(look.getX() * distance, look.getY() * distance, look.getZ() * distance));
-        Vector intercept = ReachUtils.calculateIntercept(box, eyePos, endReachPos).first();
+        final double distance = player.compensatedEntities.getSelf().getAttributeValue(PLAYER_BLOCK_INTERACTION_RANGE) + 3;
+        Vector3D eyePos = newVector3D(player.x, player.y + player.getEyeHeight(), player.z);
+        Vector3D endReachPos = eyePos.clone().add(newVector3D(look.getX() * distance, look.getY() * distance, look.getZ() * distance));
+        Vector3D intercept = calculateIntercept(box, eyePos, endReachPos).getFirst();
 
         // Bring this back to relative to the block
         // The player didn't even click the block... (we should force resync BEFORE we get here!)
-        if (intercept == null) return new Vector();
+        if (intercept == null) return newVector3D();
 
         intercept.setX(intercept.getX() - box.minX);
         intercept.setY(intercept.getY() - box.minY);

src/main/java/ac/grim/grimac/utils/blockplace/BlockPlaceResult.java

@@ -21,11 +21,13 @@ import com.github.retrooper.packetevents.protocol.world.states.type.StateType;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
 import com.github.retrooper.packetevents.protocol.world.states.type.StateValue;
 import com.github.retrooper.packetevents.util.Vector3i;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 import java.util.*;
 import java.util.stream.Collectors;
 
+import static ac.grim.grimac.utils.vector.VectorFactory.newVector3D;
+
 public enum BlockPlaceResult {
 
     // If the block only has directional data
@@ -80,7 +82,7 @@ public enum BlockPlaceResult {
     }, ItemTypes.SNOW),
 
     SLAB((player, place) -> {
-        Vector clickedPos = place.getClickedLocation();
+        Vector3D clickedPos = place.getClickedLocation();
         WrappedBlockState slabData = place.getMaterial().createBlockState(CompensatedWorld.blockVersion);
         WrappedBlockState existing = place.getExistingBlockData();
 
@@ -909,7 +911,7 @@ public enum BlockPlaceResult {
             WrappedBlockState ccwState = place.getDirectionalState(ccw);
             CollisionBox ccwBox = CollisionData.getData(ccwState.getType()).getMovementCollisionBox(player, player.getClientVersion(), ccwState);
 
-            Vector aboveCCWPos = place.getClickedLocation().add(new Vector(ccw.getModX(), ccw.getModY(), ccw.getModZ())).add(new Vector(0, 1, 0));
+            Vector3D aboveCCWPos = place.getClickedLocation().add(newVector3D(ccw.getModX(), ccw.getModY(), ccw.getModZ())).add(newVector3D(0, 1, 0));
             WrappedBlockState aboveCCWState = player.compensatedWorld.getWrappedBlockStateAt(aboveCCWPos);
             CollisionBox aboveCCWBox = CollisionData.getData(aboveCCWState.getType()).getMovementCollisionBox(player, player.getClientVersion(), aboveCCWState);
 
@@ -917,7 +919,7 @@ public enum BlockPlaceResult {
             WrappedBlockState cwState = place.getDirectionalState(cw);
             CollisionBox cwBox = CollisionData.getData(cwState.getType()).getMovementCollisionBox(player, player.getClientVersion(), cwState);
 
-            Vector aboveCWPos = place.getClickedLocation().add(new Vector(cw.getModX(), cw.getModY(), cw.getModZ())).add(new Vector(0, 1, 0));
+            Vector3D aboveCWPos = place.getClickedLocation().add(newVector3D(cw.getModX(), cw.getModY(), cw.getModZ())).add(newVector3D(0, 1, 0));
             WrappedBlockState aboveCWState = player.compensatedWorld.getWrappedBlockStateAt(aboveCWPos);
             CollisionBox aboveCWBox = CollisionData.getData(aboveCWState.getType()).getMovementCollisionBox(player, player.getClientVersion(), aboveCWState);
 
@@ -934,7 +936,7 @@ public enum BlockPlaceResult {
                 if ((!isCWLower || isCCWLower) && i >= 0) {
                     int j = playerFacing.getModX();
                     int k = playerFacing.getModZ();
-                    Vector vec3 = place.getClickedLocation();
+                    Vector3D vec3 = place.getClickedLocation();
                     double d0 = vec3.getX();
                     double d1 = vec3.getY();
                     hinge = (j >= 0 || d1 >= 0.5D) && (j <= 0 || d1 <= 0.5D) && (k >= 0 || d0 <= 0.5D) && (k <= 0 || d0 >= 0.5D) ? Hinge.LEFT : Hinge.RIGHT;

src/main/java/ac/grim/grimac/utils/blockplace/ConsumesBlockPlace.java

@@ -107,11 +107,17 @@ public class ConsumesBlockPlace {
             Attachment attachment = bell.getAttachment();
             BlockFace dir2 = BlockFace.valueOf(direction.name());
 
-            return switch (attachment) {
-                case FLOOR -> AxisUtil.isSameAxis(dir, dir2);
-                case SINGLE_WALL, DOUBLE_WALL -> !AxisUtil.isSameAxis(dir, dir2);
-                case CEILING -> true;
-            };
+            switch (attachment) {
+                case FLOOR:
+                    return AxisUtil.isSameAxis(dir, dir2);
+                case SINGLE_WALL:
+                case DOUBLE_WALL:
+                    return !AxisUtil.isSameAxis(dir, dir2);
+                case CEILING:
+                    return true;
+                default:
+                    return false;
+            }
         } else {
             return false;
         }

src/main/java/ac/grim/grimac/utils/blockstate/helper/BlockFaceHelper.java

@@ -1,7 +1,8 @@
 package ac.grim.grimac.utils.blockstate.helper;
 
+import ac.grim.grimac.utils.vector.Vector3D;
 import com.github.retrooper.packetevents.protocol.world.BlockFace;
-import org.bukkit.util.Vector;
+import ac.grim.grimac.utils.vector.Vector3D;
 
 public class BlockFaceHelper {
     public static boolean isFaceVertical(BlockFace face) {
@@ -18,45 +19,67 @@ public class BlockFaceHelper {
      */
     @Deprecated
     public static BlockFace fromBukkitFace(org.bukkit.block.BlockFace face) {
-        return switch (face) {
-            case NORTH -> BlockFace.NORTH;
-            case SOUTH -> BlockFace.SOUTH;
-            case WEST -> BlockFace.WEST;
-            case EAST -> BlockFace.EAST;
-            case UP -> BlockFace.UP;
-            case DOWN -> BlockFace.DOWN;
-            default -> BlockFace.OTHER;
-        };
+        switch (face) {
+            case NORTH:
+                return BlockFace.NORTH;
+            case SOUTH:
+                return BlockFace.SOUTH;
+            case WEST:
+                return BlockFace.WEST;
+            case EAST:
+                return BlockFace.EAST;
+            case UP:
+                return BlockFace.UP;
+            case DOWN:
+                return BlockFace.DOWN;
+            default:
+                return BlockFace.OTHER;
+        }
     }
 
     public static BlockFace getClockWise(BlockFace face) {
-        return switch (face) {
-            case NORTH -> BlockFace.EAST;
-            case SOUTH -> BlockFace.WEST;
-            case WEST -> BlockFace.NORTH;
-            default -> BlockFace.SOUTH;
-        };
+        switch (face) {
+            case NORTH:
+                return BlockFace.EAST;
+            case SOUTH:
+                return BlockFace.WEST;
+            case WEST:
+                return BlockFace.NORTH;
+            case EAST:
+            default:
+                return BlockFace.SOUTH;
+        }
     }
 
     public static BlockFace getPEClockWise(BlockFace face) {
-        return switch (face) {
-            case NORTH -> BlockFace.EAST;
-            case SOUTH -> BlockFace.WEST;
-            case WEST -> BlockFace.NORTH;
-            default -> BlockFace.SOUTH;
-        };
+        switch (face) {
+            case NORTH:
+                return BlockFace.EAST;
+            case SOUTH:
+                return BlockFace.WEST;
+            case WEST:
+                return BlockFace.NORTH;
+            case EAST:
+            default:
+                return BlockFace.SOUTH;
+        }
     }
 
     public static BlockFace getCounterClockwise(BlockFace face) {
-        return switch (face) {
-            case NORTH -> BlockFace.WEST;
-            case SOUTH -> BlockFace.EAST;
-            case WEST -> BlockFace.SOUTH;
-            default -> BlockFace.NORTH;
-        };
+        switch (face) {
+            case NORTH:
+                return BlockFace.WEST;
+            case SOUTH:
+                return BlockFace.EAST;
+            case WEST:
+                return BlockFace.SOUTH;
+            case EAST:
+            default:
+                return BlockFace.NORTH;
+        }
     }
 
-    public Vector offset(Vector toOffset, BlockFace face) {
+    public Vector3D offset(Vector3D toOffset, BlockFace face) {
         toOffset.setX(toOffset.getX() + face.getModX());
         toOffset.setY(toOffset.getY() + face.getModY());
         toOffset.setZ(toOffset.getZ() + face.getModZ());

src/main/java/ac/grim/grimac/utils/collisions/AxisUtil.java

@@ -54,22 +54,36 @@ public enum AxisUtil {
     }
 
     public static AxisSelect getAxis(BlockFace face) {
-        return switch (face) {
-            case EAST -> EAST.select;
-            case WEST -> WEST.select;
-            case NORTH -> NORTH.select;
-            case SOUTH -> SOUTH.select;
-            case UP -> UP.select;
-            default -> DOWN.select;
-        };
+        switch (face) {
+            case EAST:
+                return EAST.select;
+            case WEST:
+                return WEST.select;
+            case NORTH:
+                return NORTH.select;
+            case SOUTH:
+                return SOUTH.select;
+            case UP:
+                return UP.select;
+            case DOWN:
+            default:
+                return DOWN.select;
+        }
     }
 
     public static boolean isSameAxis(BlockFace one, BlockFace two) {
-        return switch (one) {
-            case WEST, EAST -> two == BlockFace.WEST || two == BlockFace.EAST;
-            case NORTH, SOUTH -> two == BlockFace.NORTH || two == BlockFace.SOUTH;
-            case UP, DOWN -> two == BlockFace.UP || two == BlockFace.DOWN;
-            default -> false;
-        };
+        switch (one) {
+        case WEST:
+        case EAST:
+            return two == BlockFace.WEST || two == BlockFace.EAST;
+        case NORTH:
+        case SOUTH:
+            return two == BlockFace.NORTH || two == BlockFace.SOUTH;
+        case UP:
+        case DOWN:
+            return two == BlockFace.UP || two == BlockFace.DOWN;
+        default:
+            return false;
+        }
     }
 }

src/main/java/ac/grim/grimac/utils/collisions/CollisionData.java

@@ -174,22 +174,30 @@ public enum CollisionData {
 
     // Overwrite previous SKULL enum for legacy, where head and wall skull isn't separate
     WALL_SKULL((player, version, data, x, y, z) -> {
-        return switch (data.getFacing()) {
-            case SOUTH -> new SimpleCollisionBox(0.25F, 0.25F, 0.0F, 0.75F, 0.75F, 0.5F, false);
-            case WEST -> new SimpleCollisionBox(0.5F, 0.25F, 0.25F, 1.0F, 0.75F, 0.75F, false);
-            case EAST -> new SimpleCollisionBox(0.0F, 0.25F, 0.25F, 0.5F, 0.75F, 0.75F, false);
-            default -> new SimpleCollisionBox(0.25F, 0.25F, 0.5F, 0.75F, 0.75F, 1.0F, false);
-        };
+        switch (data.getFacing()) {
+            case SOUTH:
+                return new SimpleCollisionBox(0.25F, 0.25F, 0.0F, 0.75F, 0.75F, 0.5F, false);
+            case WEST:
+                return new SimpleCollisionBox(0.5F, 0.25F, 0.25F, 1.0F, 0.75F, 0.75F, false);
+            case EAST:
+                return new SimpleCollisionBox(0.0F, 0.25F, 0.25F, 0.5F, 0.75F, 0.75F, false);
+            default:
+                return new SimpleCollisionBox(0.25F, 0.25F, 0.5F, 0.75F, 0.75F, 1.0F, false);
+        }
     }, StateTypes.CREEPER_WALL_HEAD, StateTypes.DRAGON_WALL_HEAD, StateTypes.PLAYER_WALL_HEAD, StateTypes.ZOMBIE_WALL_HEAD,
             StateTypes.SKELETON_WALL_SKULL, StateTypes.WITHER_SKELETON_WALL_SKULL),
 
     PIGLIN_WALL_HEAD((player, version, data, x, y, z) -> {
-        return switch (data.getFacing()) {
-            case SOUTH -> new HexCollisionBox(3.0D, 4.0D, 0.0D, 13.0D, 12.0D, 8.0D);
-            case EAST -> new HexCollisionBox(0.0D, 4.0D, 3.0D, 8.0D, 12.0D, 13.0D);
-            case WEST -> new HexCollisionBox(8.0D, 4.0D, 3.0D, 16.0D, 12.0D, 13.0D);
-            default -> new HexCollisionBox(3.0D, 4.0D, 8.0D, 13.0D, 12.0D, 16.0D);
-        };
+        switch (data.getFacing()) {
+            case SOUTH:
+                return new HexCollisionBox(3.0D, 4.0D, 0.0D, 13.0D, 12.0D, 8.0D);
+            case EAST:
+                return new HexCollisionBox(0.0D, 4.0D, 3.0D, 8.0D, 12.0D, 13.0D);
+            case WEST:
+                return new HexCollisionBox(8.0D, 4.0D, 3.0D, 16.0D, 12.0D, 13.0D);
+            default:
+                return new HexCollisionBox(3.0D, 4.0D, 8.0D, 13.0D, 12.0D, 16.0D);
+        }
     }, StateTypes.PIGLIN_WALL_HEAD),
 
     DOOR(new DoorHandler(), BlockTags.DOORS.getStates().toArray(new StateType[0])),
@@ -245,9 +253,7 @@ public enum CollisionData {
         return new SimpleCollisionBox(eatenPosition, 0, 0.0625, 1 - 0.0625, height, 1 - 0.0625, false);
     }, StateTypes.CAKE),
 
-    COCOA_BEANS((player, version, data, x, y, z) -> {
-        return getCocoa(version, data.getAge(), data.getFacing());
-    }, StateTypes.COCOA),
+    COCOA_BEANS((player, version, data, x, y, z) -> getCocoa(version, data.getAge(), data.getFacing()), StateTypes.COCOA),
 
     STONE_CUTTER((player, version, data, x, y, z) -> {
         if (version.isOlderThanOrEquals(ClientVersion.V_1_13_2))
@@ -350,12 +356,16 @@ public enum CollisionData {
         if (version.isOlderThanOrEquals(ClientVersion.V_1_8))
             width = 2;
 
-        return switch (data.getFacing()) {
-            case NORTH -> new HexCollisionBox(0.0D, 0.0D, 16.0D - width, 16.0D, 16.0D, 16.0D);
-            case SOUTH -> new HexCollisionBox(0.0D, 0.0D, 0.0D, 16.0D, 16.0D, width);
-            case WEST -> new HexCollisionBox(16.0D - width, 0.0D, 0.0D, 16.0D, 16.0D, 16.0D);
-            default -> new HexCollisionBox(0.0D, 0.0D, 0.0D, width, 16.0D, 16.0D);
-        };
+        switch (data.getFacing()) {
+            case NORTH:
+                return new HexCollisionBox(0.0D, 0.0D, 16.0D - width, 16.0D, 16.0D, 16.0D);
+            case SOUTH:
+                return new HexCollisionBox(0.0D, 0.0D, 0.0D, 16.0D, 16.0D, width);
+            case WEST:
+                return new HexCollisionBox(16.0D - width, 0.0D, 0.0D, 16.0D, 16.0D, 16.0D);
+            default:
+                return new HexCollisionBox(0.0D, 0.0D, 0.0D, width, 16.0D, 16.0D);
+        }
     }, StateTypes.LADDER),
 
     CAMPFIRE((player, version, data, x, y, z) -> {
@@ -532,12 +542,16 @@ public enum CollisionData {
         if (data.isOpen())
             return NoCollisionBox.INSTANCE;
 
-        return switch (data.getFacing()) {
-            case NORTH, SOUTH -> new SimpleCollisionBox(0.0F, 0.0F, 0.375F, 1.0F, 1.5F, 0.625F, false);
-            case WEST, EAST -> new SimpleCollisionBox(0.375F, 0.0F, 0.0F, 0.625F, 1.5F, 1.0F, false);
-            default -> // This code is unreachable but the compiler does not know this
-                NoCollisionBox.INSTANCE;
-        };
+        switch (data.getFacing()) {
+            case NORTH:
+            case SOUTH:
+                return new SimpleCollisionBox(0.0F, 0.0F, 0.375F, 1.0F, 1.5F, 0.625F, false);
+            case WEST:
+            case EAST:
+                return new SimpleCollisionBox(0.375F, 0.0F, 0.0F, 0.625F, 1.5F, 1.0F, false);
+            default: // This code is unreachable but the compiler does not know this
+                return NoCollisionBox.INSTANCE;
+        }
     }, BlockTags.FENCE_GATES.getStates().toArray(new StateType[0])),
 
     FENCE(new DynamicCollisionFence(), BlockTags.FENCES.getStates().toArray(new StateType[0])),
@@ -675,9 +689,7 @@ public enum CollisionData {
             0.625, 0.625, 0.625, false),
             StateTypes.STRUCTURE_VOID),
 
-    END_ROD((player, version, data, x, y, z) -> {
-        return getEndRod(version, data.getFacing());
-    }, StateTypes.END_ROD, StateTypes.LIGHTNING_ROD),
+    END_ROD((player, version, data, x, y, z) -> getEndRod(version, data.getFacing()), StateTypes.END_ROD, StateTypes.LIGHTNING_ROD),
 
     CAULDRON((player, version, data, x, y, z) -> {
         if (version.isNewerThan(ClientVersion.getById(467))) { // changed in 19w13a, 1.14 Snapshot
@@ -723,9 +735,7 @@ public enum CollisionData {
     SOULSAND(new SimpleCollisionBox(0, 0, 0, 1, 0.875, 1, false),
             StateTypes.SOUL_SAND),
 
-    PICKLE((player, version, data, x, y, z) -> {
-        return getPicklesBox(version, data.getPickles());
-    }, StateTypes.SEA_PICKLE),
+    PICKLE((player, version, data, x, y, z) -> getPicklesBox(version, data.getPickles()), StateTypes.SEA_PICKLE),
 
     TURTLEEGG((player, version, data, x, y, z) -> {
         // ViaVersion replacement block (West facing cocoa beans)
@@ -752,27 +762,34 @@ public enum CollisionData {
             BlockTags.FLOWER_POTS.getStates().toArray(new StateType[0])),
 
     WALL_SIGN((player, version, data, x, y, z) -> {
-        return switch (data.getFacing()) {
-            case NORTH -> new HexCollisionBox(0.0D, 4.5D, 14.0D, 16.0D, 12.5D, 16.0D);
-            case SOUTH -> new HexCollisionBox(0.0D, 4.5D, 0.0D, 16.0D, 12.5D, 2.0D);
-            case WEST -> new HexCollisionBox(14.0D, 4.5D, 0.0D, 16.0D, 12.5D, 16.0D);
-            case EAST -> new HexCollisionBox(0.0D, 4.5D, 0.0D, 2.0D, 12.5D, 16.0D);
-            default -> NoCollisionBox.INSTANCE;
-        };
+        switch (data.getFacing()) {
+            case NORTH:
+                return new HexCollisionBox(0.0D, 4.5D, 14.0D, 16.0D, 12.5D, 16.0D);
+            case SOUTH:
+                return new HexCollisionBox(0.0D, 4.5D, 0.0D, 16.0D, 12.5D, 2.0D);
+            case WEST:
+                return new HexCollisionBox(14.0D, 4.5D, 0.0D, 16.0D, 12.5D, 16.0D);
+            case EAST:
+                return new HexCollisionBox(0.0D, 4.5D, 0.0D, 2.0D, 12.5D, 16.0D);
+            default:
+                return NoCollisionBox.INSTANCE;
+        }
     }, BlockTags.WALL_SIGNS.getStates().toArray(new StateType[0])),
 
     WALL_FAN((player, version, data, x, y, z) -> {
-        return switch (data.getFacing()) {
-            case NORTH -> new HexCollisionBox(0.0D, 4.0D, 5.0D, 16.0D, 12.0D, 16.0D);
-            case SOUTH -> new HexCollisionBox(0.0D, 4.0D, 0.0D, 16.0D, 12.0D, 11.0D);
-            case WEST -> new HexCollisionBox(5.0D, 4.0D, 0.0D, 16.0D, 12.0D, 16.0D);
-            default -> new HexCollisionBox(0.0D, 4.0D, 0.0D, 11.0D, 12.0D, 16.0D);
-        };
+        switch (data.getFacing()) {
+            case NORTH:
+                return new HexCollisionBox(0.0D, 4.0D, 5.0D, 16.0D, 12.0D, 16.0D);
+            case SOUTH:
+                return new HexCollisionBox(0.0D, 4.0D, 0.0D, 16.0D, 12.0D, 11.0D);
+            case WEST:
+                return new HexCollisionBox(5.0D, 4.0D, 0.0D, 16.0D, 12.0D, 16.0D);
+            default:
+                return new HexCollisionBox(0.0D, 4.0D, 0.0D, 11.0D, 12.0D, 16.0D);
+        }
     }, BlockTags.WALL_CORALS.getStates().toArray(new StateType[0])),
 
-    CORAL_PLANT((player, version, data, x, y, z) -> {
-        return new HexCollisionBox(2.0D, 0.0D, 2.0D, 14.0D, 15.0D, 14.0D);
-    }, Stream.concat(
+    CORAL_PLANT((player, version, data, x, y, z) -> new HexCollisionBox(2.0D, 0.0D, 2.0D, 14.0D, 15.0D, 14.0D), Stream.concat(
                     Arrays.stream(BlockTags.CORAL_PLANTS.getStates().toArray(new StateType[0])),
                     Stream.of(StateTypes.DEAD_HORN_CORAL, StateTypes.DEAD_TUBE_CORAL, StateTypes.DEAD_BRAIN_CORAL,
                             StateTypes.DEAD_BUBBLE_CORAL, StateTypes.DEAD_FIRE_CORAL)
@@ -816,37 +833,50 @@ public enum CollisionData {
     }, StateTypes.TRIPWIRE),
 
     TRIPWIRE_HOOK((player, version, data, x, y, z) -> {
-        return switch (data.getFacing()) {
-            case NORTH -> new HexCollisionBox(5.0D, 0.0D, 10.0D, 11.0D, 10.0D, 16.0D);
-            case SOUTH -> new HexCollisionBox(5.0D, 0.0D, 0.0D, 11.0D, 10.0D, 6.0D);
-            case WEST -> new HexCollisionBox(10.0D, 0.0D, 5.0D, 16.0D, 10.0D, 11.0D);
-            default -> new HexCollisionBox(0.0D, 0.0D, 5.0D, 6.0D, 10.0D, 11.0D);
-        };
+        switch (data.getFacing()) {
+            case NORTH:
+                return new HexCollisionBox(5.0D, 0.0D, 10.0D, 11.0D, 10.0D, 16.0D);
+            case SOUTH:
+                return new HexCollisionBox(5.0D, 0.0D, 0.0D, 11.0D, 10.0D, 6.0D);
+            case WEST:
+                return new HexCollisionBox(10.0D, 0.0D, 5.0D, 16.0D, 10.0D, 11.0D);
+            default:
+                return new HexCollisionBox(0.0D, 0.0D, 5.0D, 6.0D, 10.0D, 11.0D);
+        }
     }, StateTypes.TRIPWIRE_HOOK),
 
     TORCH(new HexCollisionBox(6.0D, 0.0D, 6.0D, 10.0D, 10.0D, 10.0D),
             StateTypes.TORCH, StateTypes.REDSTONE_TORCH),
 
     WALL_TORCH((player, version, data, x, y, z) -> {
-        return switch (data.getFacing()) {
-            case NORTH -> new HexCollisionBox(5.5D, 3.0D, 11.0D, 10.5D, 13.0D, 16.0D);
-            case SOUTH -> new HexCollisionBox(5.5D, 3.0D, 0.0D, 10.5D, 13.0D, 5.0D);
-            case WEST -> new HexCollisionBox(11.0D, 3.0D, 5.5D, 16.0D, 13.0D, 10.5D);
-            case EAST -> new HexCollisionBox(0.0D, 3.0D, 5.5D, 5.0D, 13.0D, 10.5D);
+        switch (data.getFacing()) {
+            case NORTH:
+                return new HexCollisionBox(5.5D, 3.0D, 11.0D, 10.5D, 13.0D, 16.0D);
+            case SOUTH:
+                return new HexCollisionBox(5.5D, 3.0D, 0.0D, 10.5D, 13.0D, 5.0D);
+            case WEST:
+                return new HexCollisionBox(11.0D, 3.0D, 5.5D, 16.0D, 13.0D, 10.5D);
+            case EAST:
+                return new HexCollisionBox(0.0D, 3.0D, 5.5D, 5.0D, 13.0D, 10.5D);
             // 1.13 separates wall and normal torches, 1.12 does not
-            default -> new HexCollisionBox(6.0D, 0.0D, 6.0D, 10.0D, 10.0D, 10.0D);
-        };
+            default:
+                return new HexCollisionBox(6.0D, 0.0D, 6.0D, 10.0D, 10.0D, 10.0D);
+        }
     }, StateTypes.WALL_TORCH, StateTypes.REDSTONE_WALL_TORCH),
 
     // 1.17 blocks
     CANDLE((player, version, data, x, y, z) -> {
         if (version.isNewerThanOrEquals(ClientVersion.V_1_17)) {
-            return switch (data.getCandles()) {
-                case 1 -> new HexCollisionBox(7.0, 0.0, 7.0, 9.0, 6.0, 9.0);
-                case 2 -> new HexCollisionBox(5.0, 0.0, 6.0, 11.0, 6.0, 9.0);
-                case 3 -> new HexCollisionBox(5.0, 0.0, 6.0, 10.0, 6.0, 11.0);
-                default -> new HexCollisionBox(5.0, 0.0, 5.0, 11.0, 6.0, 10.0);
-            };
+            switch (data.getCandles()) {
+                case 1:
+                    return new HexCollisionBox(7.0, 0.0, 7.0, 9.0, 6.0, 9.0);
+                case 2:
+                    return new HexCollisionBox(5.0, 0.0, 6.0, 11.0, 6.0, 9.0);
+                case 3:
+                    return new HexCollisionBox(5.0, 0.0, 6.0, 10.0, 6.0, 11.0);
+                default:
+                    return new HexCollisionBox(5.0, 0.0, 5.0, 11.0, 6.0, 10.0);
+            }
         }
 
         return getPicklesBox(version, data.getCandles());
@@ -936,27 +966,17 @@ public enum CollisionData {
         return new HexCollisionBox(6.0D, 0.0D, 0.0D, 10.0D, 16.0D, 16.0D);
     }, StateTypes.NETHER_PORTAL),
 
-    AZALEA((player, version, data, x, y, z) -> {
-        return new ComplexCollisionBox(2,
+    AZALEA((player, version, data, x, y, z) -> new ComplexCollisionBox(2,
                 new HexCollisionBox(0.0, 8.0, 0.0, 16.0, 16.0, 16.0),
-                new HexCollisionBox(6.0, 0.0, 6.0, 10.0, 8.0, 10.0));
-    }, StateTypes.AZALEA, StateTypes.FLOWERING_AZALEA),
+            new HexCollisionBox(6.0, 0.0, 6.0, 10.0, 8.0, 10.0)), StateTypes.AZALEA, StateTypes.FLOWERING_AZALEA),
 
-    AMETHYST_CLUSTER((player, version, data, x, y, z) -> {
-        return getAmethystBox(version, data.getFacing(), 7, 3);
-    }, StateTypes.AMETHYST_CLUSTER),
+    AMETHYST_CLUSTER((player, version, data, x, y, z) -> getAmethystBox(version, data.getFacing(), 7, 3), StateTypes.AMETHYST_CLUSTER),
 
-    SMALL_AMETHYST_BUD((player, version, data, x, y, z) -> {
-        return getAmethystBox(version, data.getFacing(), 3, 4);
-    }, StateTypes.SMALL_AMETHYST_BUD),
+    SMALL_AMETHYST_BUD((player, version, data, x, y, z) -> getAmethystBox(version, data.getFacing(), 3, 4), StateTypes.SMALL_AMETHYST_BUD),
 
-    MEDIUM_AMETHYST_BUD((player, version, data, x, y, z) -> {
-        return getAmethystBox(version, data.getFacing(), 4, 3);
-    }, StateTypes.MEDIUM_AMETHYST_BUD),
+    MEDIUM_AMETHYST_BUD((player, version, data, x, y, z) -> getAmethystBox(version, data.getFacing(), 4, 3), StateTypes.MEDIUM_AMETHYST_BUD),
 
-    LARGE_AMETHYST_BUD((player, version, data, x, y, z) -> {
-        return getAmethystBox(version, data.getFacing(), 5, 3);
-    }, StateTypes.LARGE_AMETHYST_BUD),
+    LARGE_AMETHYST_BUD((player, version, data, x, y, z) -> getAmethystBox(version, data.getFacing(), 5, 3), StateTypes.LARGE_AMETHYST_BUD),
 
     MUD_BLOCK((player, version, data, x, y, z) -> {
         if (version.isNewerThanOrEquals(ClientVersion.V_1_19)) {
@@ -969,13 +989,18 @@ public enum CollisionData {
         if (!data.isHanging()) {
             return new HexCollisionBox(7.0D, 0.0D, 7.0D, 9.0D, 16.0D, 9.0D);
         }
-        return switch (data.getAge()) {
-            case 0 -> new HexCollisionBox(7.0D, 13.0D, 7.0D, 9.0D, 16.0D, 9.0D);
-            case 1 -> new HexCollisionBox(7.0D, 10.0D, 7.0D, 9.0D, 16.0D, 9.0D);
-            case 2 -> new HexCollisionBox(7.0D, 7.0D, 7.0D, 9.0D, 16.0D, 9.0D);
-            case 3 -> new HexCollisionBox(7.0D, 3.0D, 7.0D, 9.0D, 16.0D, 9.0D);
-            default -> new HexCollisionBox(7.0D, 0.0D, 7.0D, 9.0D, 16.0D, 9.0D);
-        };
+        switch (data.getAge()) {
+            case 0:
+                return new HexCollisionBox(7.0D, 13.0D, 7.0D, 9.0D, 16.0D, 9.0D);
+            case 1:
+                return new HexCollisionBox(7.0D, 10.0D, 7.0D, 9.0D, 16.0D, 9.0D);
+            case 2:
+                return new HexCollisionBox(7.0D, 7.0D, 7.0D, 9.0D, 16.0D, 9.0D);
+            case 3:
+                return new HexCollisionBox(7.0D, 3.0D, 7.0D, 9.0D, 16.0D, 9.0D);
+            default:
+                return new HexCollisionBox(7.0D, 0.0D, 7.0D, 9.0D, 16.0D, 9.0D);
+        }
     }, StateTypes.MANGROVE_PROPAGULE),
 
     SCULK_SHRIKER((player, version, data, x, y, z) -> {
@@ -1010,11 +1035,16 @@ public enum CollisionData {
     }, StateTypes.PITCHER_CROP),
 
     WALL_HANGING_SIGNS((player, version, data, x, y, z) -> {
-        return switch (data.getFacing()) {
-            case NORTH, SOUTH -> new HexCollisionBox(0.0, 14.0, 6.0, 16.0, 16.0, 10.0);
-            case WEST, EAST -> new HexCollisionBox(6.0, 14.0, 0.0, 10.0, 16.0, 16.0);
-            default -> NoCollisionBox.INSTANCE;
-        };
+        switch (data.getFacing()) {
+            case NORTH:
+            case SOUTH:
+                return new HexCollisionBox(0.0, 14.0, 6.0, 16.0, 16.0, 10.0);
+            case WEST:
+            case EAST:
+                return new HexCollisionBox(6.0, 14.0, 0.0, 10.0, 16.0, 16.0);
+            default:
+                return NoCollisionBox.INSTANCE;
+        }
     }, BlockTags.WALL_HANGING_SIGNS.getStates().toArray(new StateType[0])),
 
     DEFAULT(new SimpleCollisionBox(0, 0, 0, 1, 1, 1, true), StateTypes.STONE);
@@ -1052,14 +1082,20 @@ public enum CollisionData {
         if (version.isOlderThanOrEquals(ClientVersion.V_1_16_4))
             return NoCollisionBox.INSTANCE;
 
-        return switch (facing) {
-            case DOWN -> new HexCollisionBox(param_1, 16 - param_0, param_1, 16 - param_1, 16.0, 16 - param_1);
-            case NORTH -> new HexCollisionBox(param_1, param_1, 16 - param_0, 16 - param_1, 16 - param_1, 16.0);
-            case SOUTH -> new HexCollisionBox(param_1, param_1, 0.0, 16 - param_1, 16 - param_1, param_0);
-            case EAST -> new HexCollisionBox(0.0, param_1, param_1, param_0, 16 - param_1, 16 - param_1);
-            case WEST -> new HexCollisionBox(16 - param_0, param_1, param_1, 16.0, 16 - param_1, 16 - param_1);
-            default -> new HexCollisionBox(param_1, 0.0, param_1, 16 - param_1, param_0, 16 - param_1);
-        };
+        switch (facing) {
+            case DOWN:
+                return new HexCollisionBox(param_1, 16 - param_0, param_1, 16 - param_1, 16.0, 16 - param_1);
+            case NORTH:
+                return new HexCollisionBox(param_1, param_1, 16 - param_0, 16 - param_1, 16 - param_1, 16.0);
+            case SOUTH:
+                return new HexCollisionBox(param_1, param_1, 0.0, 16 - param_1, 16 - param_1, param_0);
+            case EAST:
+                return new HexCollisionBox(0.0, param_1, param_1, param_0, 16 - param_1, 16 - param_1);
+            case WEST:
+                return new HexCollisionBox(16 - param_0, param_1, param_1, 16.0, 16 - param_1, 16 - param_1);
+            default:
+                return new HexCollisionBox(param_1, 0.0, param_1, 16 - param_1, param_0, 16 - param_1);
+        }
     }
 
     private static CollisionBox getPicklesBox(ClientVersion version, int pickles) {
@@ -1068,13 +1104,18 @@ public enum CollisionData {
             return getCocoa(version, pickles, BlockFace.WEST);
         }
 
-        return switch (pickles) {
-            case 1 -> new HexCollisionBox(6.0D, 0.0D, 6.0D, 10.0D, 6.0D, 10.0D);
-            case 2 -> new HexCollisionBox(3.0D, 0.0D, 3.0D, 13.0D, 6.0D, 13.0D);
-            case 3 -> new HexCollisionBox(2.0D, 0.0D, 2.0D, 14.0D, 6.0D, 14.0D);
-            case 4 -> new HexCollisionBox(2.0D, 0.0D, 2.0D, 14.0D, 7.0D, 14.0D);
-            default -> NoCollisionBox.INSTANCE;
-        };
+        switch (pickles) {
+            case 1:
+                return new HexCollisionBox(6.0D, 0.0D, 6.0D, 10.0D, 6.0D, 10.0D);
+            case 2:
+                return new HexCollisionBox(3.0D, 0.0D, 3.0D, 13.0D, 6.0D, 13.0D);
+            case 3:
+                return new HexCollisionBox(2.0D, 0.0D, 2.0D, 14.0D, 6.0D, 14.0D);
+            case 4:
+                return new HexCollisionBox(2.0D, 0.0D, 2.0D, 14.0D, 7.0D, 14.0D);
+            default:
+                return NoCollisionBox.INSTANCE;
+        }
     }
 
     public static CollisionBox getCocoa(ClientVersion version, int age, BlockFace direction) {
@@ -1129,11 +1170,16 @@ public enum CollisionData {
         if (version.isOlderThan(ClientVersion.V_1_9))
             return NoCollisionBox.INSTANCE;
 
-        return switch (face) {
-            case NORTH, SOUTH -> new HexCollisionBox(6.0D, 6.0D, 0.0D, 10.0D, 10.0D, 16.0D);
-            case EAST, WEST -> new HexCollisionBox(0.0D, 6.0D, 6.0D, 16.0D, 10.0D, 10.0D);
-            default -> new HexCollisionBox(6.0D, 0.0D, 6.0D, 10.0D, 16.0D, 10.0);
-        };
+        switch (face) {
+            case NORTH:
+            case SOUTH:
+                return new HexCollisionBox(6.0D, 6.0D, 0.0D, 10.0D, 10.0D, 16.0D);
+            case EAST:
+            case WEST:
+                return new HexCollisionBox(0.0D, 6.0D, 6.0D, 16.0D, 10.0D, 10.0D);
+            default:
+                return new HexCollisionBox(6.0D, 0.0D, 6.0D, 10.0D, 16.0D, 10.0);
+        }
     }
 
     // Would pre-computing all states be worth the memory cost? I doubt it

src/main/java/ac/grim/grimac/utils/collisions/HitboxData.java

@@ -20,29 +20,32 @@ import java.util.*;
 public enum HitboxData {
 
     RAILS((player, item, version, data, x, y, z) -> {
-        return switch (data.getShape()) {
-            case ASCENDING_NORTH, ASCENDING_SOUTH, ASCENDING_EAST, ASCENDING_WEST -> {
+        switch (data.getShape()) {
+            case ASCENDING_NORTH:
+            case ASCENDING_SOUTH:
+            case ASCENDING_EAST:
+            case ASCENDING_WEST:
                 if (version.isOlderThan(ClientVersion.V_1_8)) {
                     StateType railType = data.getType();
                     // Activator rails always appear as flat detector rails in 1.7.10 because of ViaVersion
                     // Ascending power rails in 1.7 have flat rail hitbox https://bugs.mojang.com/browse/MC-9134
                     if (railType == StateTypes.ACTIVATOR_RAIL || (railType == StateTypes.POWERED_RAIL && data.isPowered())) {
-                        yield new SimpleCollisionBox(0.0F, 0.0F, 0.0F, 1.0F, 0.125F, 1.0F, false);
+                        return new SimpleCollisionBox(0.0F, 0.0F, 0.0F, 1.0F, 0.125F, 1.0F, false);
                     }
-                    yield new SimpleCollisionBox(0.0F, 0.0F, 0.0F, 1.0F, 0.625F, 1.0F, false);
+                    return new SimpleCollisionBox(0.0F, 0.0F, 0.0F, 1.0F, 0.625F, 1.0F, false);
                 } else if (version.isOlderThan(ClientVersion.V_1_9)) {
-                    yield new SimpleCollisionBox(0.0F, 0.0F, 0.0F, 1.0F, 0.625F, 1.0F, false);
+                    return new SimpleCollisionBox(0.0F, 0.0F, 0.0F, 1.0F, 0.625F, 1.0F, false);
                 } else if (version.isNewerThanOrEquals(ClientVersion.V_1_9) && version.isOlderThan(ClientVersion.V_1_10)) {
                     // https://bugs.mojang.com/browse/MC-89552 sloped rails in 1.9 - it is slightly taller than a regular rail
-                    yield new SimpleCollisionBox(0.0F, 0.0F, 0.0F, 1.0F, 0.1875F, 1.0F, false);
+                    return new SimpleCollisionBox(0.0F, 0.0F, 0.0F, 1.0F, 0.1875F, 1.0F, false);
                 } else if (version.isOlderThan(ClientVersion.V_1_11)) {
                     // https://bugs.mojang.com/browse/MC-102638 All sloped rails are full blocks in 1.10
-                    yield new SimpleCollisionBox(0, 0, 0, 1, 1, 1, true);
+                    return new SimpleCollisionBox(0, 0, 0, 1, 1, 1, true);
                 }
-                yield new HexCollisionBox(0.0D, 0.0D, 0.0D, 16.0D, 8.0D, 16.0D);
-            }
-            default -> new HexCollisionBox(0.0D, 0.0D, 0.0D, 16.0D, 2.0D, 16.0D);
-        };
+                return new HexCollisionBox(0.0D, 0.0D, 0.0D, 16.0D, 8.0D, 16.0D);
+            default:
+                return new HexCollisionBox(0.0D, 0.0D, 0.0D, 16.0D, 2.0D, 16.0D);
+        }
     }, BlockTags.RAILS.getStates().toArray(new StateType[0])),
 
     END_PORTAL((player, item, version, data, x, y, z) -> {
@@ -106,31 +109,35 @@ public enum HitboxData {
             }
         }
 
-        return switch (face) {
-            case FLOOR -> {
+        switch (face) {
+            case FLOOR:
                 // X-AXIS
                 if (facing == BlockFace.EAST || facing == BlockFace.WEST) {
-                    yield new SimpleCollisionBox(0.25, 0.0, 0.3125, 0.75, 0.375, 0.6875, false);
+                    return new SimpleCollisionBox(0.25, 0.0, 0.3125, 0.75, 0.375, 0.6875, false);
                 }
                 // Z-AXIS
-                yield new SimpleCollisionBox(0.3125, 0.0, 0.25, 0.6875, 0.375, 0.75, false);
-                // Z-AXIS
-            }
-            case WALL -> switch (facing) {
-                case EAST -> new SimpleCollisionBox(0.0, 0.25, 0.3125, 0.375, 0.75, 0.6875, false);
-                case WEST -> new SimpleCollisionBox(0.625, 0.25, 0.3125, 1.0, 0.75, 0.6875, false);
-                case SOUTH -> new SimpleCollisionBox(0.3125, 0.25, 0.0, 0.6875, 0.75, 0.375, false);
-                default -> new SimpleCollisionBox(0.3125, 0.25, 0.625, 0.6875, 0.75, 1.0, false);
-            };
-            default -> {
+                return new SimpleCollisionBox(0.3125, 0.0, 0.25, 0.6875, 0.375, 0.75, false);
+            case WALL:
+                switch (facing) {
+                    case EAST:
+                        return new SimpleCollisionBox(0.0, 0.25, 0.3125, 0.375, 0.75, 0.6875, false);
+                    case WEST:
+                        return new SimpleCollisionBox(0.625, 0.25, 0.3125, 1.0, 0.75, 0.6875, false);
+                    case SOUTH:
+                        return new SimpleCollisionBox(0.3125, 0.25, 0.0, 0.6875, 0.75, 0.375, false);
+                    case NORTH:
+                    default:
+                        return new SimpleCollisionBox(0.3125, 0.25, 0.625, 0.6875, 0.75, 1.0, false);
+                }
+            case CEILING:
+            default:
                 // X-AXIS
                 if (facing == BlockFace.EAST || facing == BlockFace.WEST) {
-                    yield new SimpleCollisionBox(0.25, 0.625, 0.3125, 0.75, 1.0, 0.6875, false);
+                    return new SimpleCollisionBox(0.25, 0.625, 0.3125, 0.75, 1.0, 0.6875, false);
                 }
                 // Z-Axis
-                yield new SimpleCollisionBox(0.3125, 0.625, 0.25, 0.6875, 1.0, 0.75, false);
-            }
-        };
+                return new SimpleCollisionBox(0.3125, 0.625, 0.25, 0.6875, 1.0, 0.75, false);
+        }
     }), StateTypes.LEVER),
 
     BUTTON((player, item, version, data, x, y, z) -> {
@@ -164,17 +171,27 @@ public enum HitboxData {
 
         switch (face) {
             case WALL:
-                return switch (facing) {
-                    case EAST ->
-                            powered ? new HexCollisionBox(0.0, 6.0, 5.0, 1.0, 10.0, 11.0) : new HexCollisionBox(0.0, 6.0, 5.0, 2.0, 10.0, 11.0);
-                    case WEST ->
-                            powered ? new HexCollisionBox(15.0, 6.0, 5.0, 16.0, 10.0, 11.0) : new HexCollisionBox(14.0, 6.0, 5.0, 16.0, 10.0, 11.0);
-                    case SOUTH ->
-                            powered ? new HexCollisionBox(5.0, 6.0, 0.0, 11.0, 10.0, 1.0) : new HexCollisionBox(5.0, 6.0, 0.0, 11.0, 10.0, 2.0);
-                    case NORTH, UP, DOWN ->
-                            powered ? new HexCollisionBox(5.0, 6.0, 15.0, 11.0, 10.0, 16.0) : new HexCollisionBox(5.0, 6.0, 14.0, 11.0, 10.0, 16.0);
-                    default -> NoCollisionBox.INSTANCE;
-                };
+                CollisionBox shape;
+                switch (facing) {
+                    case EAST:
+                        shape = powered ? new HexCollisionBox(0.0, 6.0, 5.0, 1.0, 10.0, 11.0) : new HexCollisionBox(0.0, 6.0, 5.0, 2.0, 10.0, 11.0);
+                        break;
+                    case WEST:
+                        shape = powered ? new HexCollisionBox(15.0, 6.0, 5.0, 16.0, 10.0, 11.0) : new HexCollisionBox(14.0, 6.0, 5.0, 16.0, 10.0, 11.0);
+                        break;
+                    case SOUTH:
+                        shape = powered ? new HexCollisionBox(5.0, 6.0, 0.0, 11.0, 10.0, 1.0) : new HexCollisionBox(5.0, 6.0, 0.0, 11.0, 10.0, 2.0);
+                        break;
+                    case NORTH:
+                    case UP:
+                    case DOWN:
+                        shape = powered ? new HexCollisionBox(5.0, 6.0, 15.0, 11.0, 10.0, 16.0) : new HexCollisionBox(5.0, 6.0, 14.0, 11.0, 10.0, 16.0);
+                        break;
+                    default:
+                        shape = NoCollisionBox.INSTANCE;
+                }
+
+                return shape;
             case CEILING:
                 // ViaVersion shows lever
                 if (player.getClientVersion().isOlderThan(ClientVersion.V_1_8)) {
@@ -205,24 +222,32 @@ public enum HitboxData {
     WALL(new DynamicHitboxWall(), BlockTags.WALLS.getStates().toArray(new StateType[0])),
 
     WALL_SIGN((player, item, version, data, x, y, z) -> {
-        return switch (data.getFacing()) {
-            case NORTH -> new HexCollisionBox(0.0, 4.5, 14.0, 16.0, 12.5, 16.0);
-            case SOUTH -> new HexCollisionBox(0.0, 4.5, 0.0, 16.0, 12.5, 2.0);
-            case EAST -> new HexCollisionBox(0.0, 4.5, 0.0, 2.0, 12.5, 16.0);
-            case WEST -> new HexCollisionBox(14.0, 4.5, 0.0, 16.0, 12.5, 16.0);
-            default -> NoCollisionBox.INSTANCE;
-        };
+        switch (data.getFacing()) {
+            case NORTH:
+                return new HexCollisionBox(0.0, 4.5, 14.0, 16.0, 12.5, 16.0);
+            case SOUTH:
+                return new HexCollisionBox(0.0, 4.5, 0.0, 16.0, 12.5, 2.0);
+            case EAST:
+                return new HexCollisionBox(0.0, 4.5, 0.0, 2.0, 12.5, 16.0);
+            case WEST:
+                return new HexCollisionBox(14.0, 4.5, 0.0, 16.0, 12.5, 16.0);
+            default:
+                return NoCollisionBox.INSTANCE;
+        }
     }, BlockTags.WALL_SIGNS.getStates().toArray(new StateType[0])),
 
     WALL_HANGING_SIGN((player, item, version, data, x, y, z) -> {
-        return switch (data.getFacing()) {
-            case NORTH, SOUTH -> new ComplexCollisionBox(2,
+        switch (data.getFacing()) {
+            case NORTH:
+            case SOUTH:
+                return new ComplexCollisionBox(2,
                     new HexCollisionBox(0.0D, 14.0D, 6.0D, 16.0D, 16.0D, 10.0D),
-                    new HexCollisionBox(1.0D, 0.0D, 7.0D, 15.0D, 10.0D, 9.0D));
-            default -> new ComplexCollisionBox(2,
+                        new HexCollisionBox(1.0D, 0.0D, 7.0D, 15.0D, 10.0D, 9.0D));
+            default:
+                return new ComplexCollisionBox(2,
                     new HexCollisionBox(6.0D, 14.0D, 0.0D, 10.0D, 16.0D, 16.0D),
-                    new HexCollisionBox(7.0D, 0.0D, 1.0D, 9.0D, 10.0D, 15.0D));
-        };
+                        new HexCollisionBox(7.0D, 0.0D, 1.0D, 9.0D, 10.0D, 15.0D));
+        }
     }, BlockTags.WALL_HANGING_SIGNS.getStates().toArray(new StateType[0])),
 
     STANDING_SIGN((player, item, version, data, x, y, z) ->
@@ -247,13 +272,18 @@ public enum HitboxData {
             return WALL_SIGN.dynamic.fetch(player, item, version, data, x, y, z);
         }
 
-        return switch (data.getFacing()) {
-            case NORTH -> new HexCollisionBox(0.0, 0.0, 14.0, 16.0, 12.5, 16.0);
-            case EAST -> new HexCollisionBox(0.0, 0.0, 0.0, 2.0, 12.5, 16.0);
-            case WEST -> new HexCollisionBox(14.0, 0.0, 0.0, 16.0, 12.5, 16.0);
-            case SOUTH -> new HexCollisionBox(0.0, 0.0, 0.0, 16.0, 12.5, 2.0);
-            default -> throw new IllegalStateException("Impossible Banner Facing State; Something very wrong is going on");
-        };
+        switch (data.getFacing()) {
+            case NORTH:
+                return new HexCollisionBox(0.0, 0.0, 14.0, 16.0, 12.5, 16.0);
+            case EAST:
+                return new HexCollisionBox(0.0, 0.0, 0.0, 2.0, 12.5, 16.0);
+            case WEST:
+                return new HexCollisionBox(14.0, 0.0, 0.0, 16.0, 12.5, 16.0);
+            case SOUTH:
+                return new HexCollisionBox(0.0, 0.0, 0.0, 16.0, 12.5, 2.0);
+            default:
+                throw new IllegalStateException("Impossible Banner Facing State; Something very wrong is going on");
+        }
     }, StateTypes.WHITE_WALL_BANNER, StateTypes.ORANGE_WALL_BANNER, StateTypes.MAGENTA_WALL_BANNER,
             StateTypes.LIGHT_BLUE_WALL_BANNER, StateTypes.YELLOW_WALL_BANNER, StateTypes.LIME_WALL_BANNER,
             StateTypes.PINK_WALL_BANNER, StateTypes.GRAY_WALL_BANNER, StateTypes.LIGHT_GRAY_WALL_BANNER,
@@ -398,12 +428,17 @@ public enum HitboxData {
         if (version.isOlderThan(ClientVersion.V_1_13))
             return new HexCollisionBox(7.0D, 0.0D, 7.0D, 9.0D, 16.0D, 9.0D);
 
-        return switch (data.getFacing()) {
-            case SOUTH -> new HexCollisionBox(6.0D, 0.0D, 6.0D, 10.0D, 10.0D, 16.0D);
-            case WEST -> new HexCollisionBox(0.0D, 0.0D, 6.0D, 10.0D, 10.0D, 10.0D);
-            case NORTH -> new HexCollisionBox(6.0D, 0.0D, 0.0D, 10.0D, 10.0D, 10.0D);
-            default -> new HexCollisionBox(6.0D, 0.0D, 6.0D, 16.0D, 10.0D, 10.0D);
-        };
+        switch (data.getFacing()) {
+            case SOUTH:
+                return new HexCollisionBox(6.0D, 0.0D, 6.0D, 10.0D, 10.0D, 16.0D);
+            case WEST:
+                return new HexCollisionBox(0.0D, 0.0D, 6.0D, 10.0D, 10.0D, 10.0D);
+            case NORTH:
+                return new HexCollisionBox(6.0D, 0.0D, 0.0D, 10.0D, 10.0D, 10.0D);
+            case EAST:
+            default:
+                return new HexCollisionBox(6.0D, 0.0D, 6.0D, 16.0D, 10.0D, 10.0D);
+        }
     }, StateTypes.ATTACHED_MELON_STEM, StateTypes.ATTACHED_PUMPKIN_STEM),
 
     PUMPKIN_STEM((player, item, version, data, x, y, z) -> {
@@ -638,11 +673,16 @@ public enum HitboxData {
     }
 
     private static int getPropaguleMinHeight(int age) {
-        return switch (age) {
-            case 0, 1, 2 -> 13 - age * 3;
-            case 3, 4 -> (4 - age) * 3;
-            default -> throw new IllegalStateException("Impossible Propagule Height");
-        };
+        switch (age) {
+            case 0:
+            case 1:
+            case 2:
+                return 13 - age * 3;
+            case 3:
+            case 4:
+                return (4 - age) * 3;
+        }
+        throw new IllegalStateException("Impossible Propagule Height");
     }
 
     private static CollisionBox getVineCollisionBox(ClientVersion version, boolean isWeeping, boolean isBlock) {
@@ -666,13 +706,19 @@ public enum HitboxData {
     }
 
     private static int getHorizontalID(BlockFace facing) {
-        return switch (facing) {
-            case DOWN, UP -> -1;
-            case NORTH -> 2;
-            case SOUTH -> 0;
-            case WEST -> 1;
-            case EAST -> 3;
-            default -> throw new IllegalStateException("Impossible blockface for getHorizontalID");
-        };
+        switch (facing) {
+            case DOWN:
+            case UP:
+                return -1;
+            case NORTH:
+                return 2;
+            case SOUTH:
+                return 0;
+            case WEST:
+                return 1;
+            case EAST:
+                return 3;
+        }
+        throw new IllegalStateException("Impossible blockface for getHorizontalID");
     }
 }

src/main/java/ac/grim/grimac/utils/collisions/RaycastData.java

@@ -0,0 +1,97 @@
+package ac.grim.grimac.utils.collisions;
+
+/*
+
+ */
+import ac.grim.grimac.player.GrimPlayer;
+import ac.grim.grimac.utils.collisions.datatypes.*;
+import com.github.retrooper.packetevents.protocol.player.ClientVersion;
+import com.github.retrooper.packetevents.protocol.world.states.WrappedBlockState;
+import com.github.retrooper.packetevents.protocol.world.states.defaulttags.BlockTags;
+import com.github.retrooper.packetevents.protocol.world.states.type.StateType;
+import com.github.retrooper.packetevents.protocol.world.states.type.StateTypes;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.*;
+
+// Expansion to the CollisionData class, which is different than regular ray tracing hitboxes
+public enum RaycastData {
+
+    HOPPER((player, item, version, data, x, y, z) -> {
+        HexCollisionBox insideShape = new HexCollisionBox(2.0, 11.0, 2.0, 14.0, 16.0, 14.0);
+        switch (data.getFacing()) {
+            case NORTH:
+                new ComplexCollisionBox(insideShape, new HexCollisionBox(6.0, 8.0, 0.0, 10.0, 10.0, 4.0));
+            case SOUTH:
+                new ComplexCollisionBox(insideShape, new HexCollisionBox(6.0, 8.0, 12.0, 10.0, 10.0, 16.0));
+            case WEST:
+                new ComplexCollisionBox(insideShape, new HexCollisionBox(0.0, 8.0, 6.0, 4.0, 10.0, 10.0));
+            case EAST:
+                new ComplexCollisionBox(insideShape, new HexCollisionBox(12.0, 8.0, 6.0, 16.0, 10.0, 10.0));
+            default:
+                return insideShape;
+        }
+    }, StateTypes.HOPPER),
+
+    CAULDRON((player, item, version, data, x, y, z) -> {
+        return new HexCollisionBox(2.0, 4.0, 2.0, 14.0, 16.0, 14.0);
+    }, BlockTags.CAULDRONS.getStates().toArray(new StateType[0])),
+
+    FULL_BLOCK((player, item, version, data, x, y, z) -> {
+        return new SimpleCollisionBox(0, 0, 0, 1, 1, 1, true);
+    }, StateTypes.COMPOSTER, StateTypes.SCAFFOLDING);
+
+
+    private static final Map<StateType, RaycastData> lookup = new HashMap<>();
+
+    static {
+        for (RaycastData data : RaycastData.values()) {
+            for (StateType type : data.materials) {
+                lookup.put(type, data);
+            }
+        }
+    }
+
+    private final StateType[] materials;
+    private CollisionBox box;
+    private HitBoxFactory dynamic;
+
+    RaycastData(CollisionBox box, StateType... materials) {
+        this.box = box;
+        Set<StateType> mList = new HashSet<>(Arrays.asList(materials));
+        mList.remove(null); // Sets can contain one null
+        this.materials = mList.toArray(new StateType[0]);
+    }
+
+    RaycastData(HitBoxFactory dynamic, StateType... materials) {
+        this.dynamic = dynamic;
+        Set<StateType> mList = new HashSet<>(Arrays.asList(materials));
+        mList.remove(null); // Sets can contain one null
+        this.materials = mList.toArray(new StateType[0]);
+    }
+
+    public static RaycastData getData(StateType material) {
+        return lookup.get(material);
+    }
+
+    @Nullable
+    public static CollisionBox getBlockHitbox(GrimPlayer player, StateType heldItem, ClientVersion version, WrappedBlockState block, int x, int y, int z) {
+        RaycastData data = getData(block.getType());
+
+        if (data == null) {
+            // We explicitly do not want to fallback on HitBoxData or CollisionBox
+            // Because we only ever use this as a 2nd ray trace
+            return NoCollisionBox.INSTANCE;
+        }
+
+        // Simple collision box to override
+        if (data.box != null)
+            return data.box.copy().offset(x, y, z);
+
+        // Allow this class to override collision boxes when they aren't the same as regular boxes
+        HitBoxFactory hitBoxFactory = data.dynamic;
+        CollisionBox collisionBox = hitBoxFactory.fetch(player, heldItem, version, block, x, y, z);
+        collisionBox.offset(x, y, z);
+        return collisionBox;
+    }
+}

src/main/java/ac/grim/grimac/utils/collisions/blocks/DoorHandler.java

@@ -21,14 +21,18 @@ public class DoorHandler implements CollisionFactory {
 
     @Override
     public CollisionBox fetch(GrimPlayer player, ClientVersion version, WrappedBlockState block, int x, int y, int z) {
-        return switch (fetchDirection(player, version, block, x, y, z)) {
-            case NORTH -> NORTH_AABB.copy();
-            case SOUTH -> SOUTH_AABB.copy();
-            case EAST -> EAST_AABB.copy();
-            case WEST -> WEST_AABB.copy();
-            default -> NoCollisionBox.INSTANCE;
-        };
+        switch (fetchDirection(player, version, block, x, y, z)) {
+            case NORTH:
+                return NORTH_AABB.copy();
+            case SOUTH:
+                return SOUTH_AABB.copy();
+            case EAST:
+                return EAST_AABB.copy();
+            case WEST:
+                return WEST_AABB.copy();
+        }
 
+        return NoCollisionBox.INSTANCE;
     }
 
     public BlockFace fetchDirection(GrimPlayer player, ClientVersion version, WrappedBlockState door, int x, int y, int z) {
@@ -76,11 +80,16 @@ public class DoorHandler implements CollisionFactory {
             isRightHinge = door.getHinge() == Hinge.RIGHT;
         }
 
-        return switch (facingDirection) {
-            case SOUTH -> isClosed ? BlockFace.SOUTH : (isRightHinge ? BlockFace.EAST : BlockFace.WEST);
-            case WEST -> isClosed ? BlockFace.WEST : (isRightHinge ? BlockFace.SOUTH : BlockFace.NORTH);
-            case NORTH -> isClosed ? BlockFace.NORTH : (isRightHinge ? BlockFace.WEST : BlockFace.EAST);
-            default -> isClosed ? BlockFace.EAST : (isRightHinge ? BlockFace.NORTH : BlockFace.SOUTH);
-        };
+        switch (facingDirection) {
+            case EAST:
+            default:
+                return isClosed ? BlockFace.EAST : (isRightHinge ? BlockFace.NORTH : BlockFace.SOUTH);
+            case SOUTH:
+                return isClosed ? BlockFace.SOUTH : (isRightHinge ? BlockFace.EAST : BlockFace.WEST);
+            case WEST:
+                return isClosed ? BlockFace.WEST : (isRightHinge ? BlockFace.SOUTH : BlockFace.NORTH);
+            case NORTH:
+                return isClosed ? BlockFace.NORTH : (isRightHinge ? BlockFace.WEST : BlockFace.EAST);
+        }
     }
 }

src/main/java/ac/grim/grimac/utils/collisions/blocks/DynamicStair.java

@@ -74,12 +74,17 @@ public class DynamicStair implements CollisionFactory {
     }
 
     private static BlockFace rotateYCCW(BlockFace face) {
-        return switch (face) {
-            case EAST -> BlockFace.NORTH;
-            case SOUTH -> BlockFace.EAST;
-            case WEST -> BlockFace.SOUTH;
-            default -> BlockFace.WEST;
-        };
+        switch (face) {
+            default:
+            case NORTH:
+                return BlockFace.WEST;
+            case EAST:
+                return BlockFace.NORTH;
+            case SOUTH:
+                return BlockFace.EAST;
+            case WEST:
+                return BlockFace.SOUTH;
+        }
     }
 
     private static CollisionBox[] makeShapes(SimpleCollisionBox p_199779_0_, SimpleCollisionBox p_199779_1_, SimpleCollisionBox p_199779_2_, SimpleCollisionBox p_199779_3_, SimpleCollisionBox p_199779_4_) {
@@ -126,23 +131,36 @@ public class DynamicStair implements CollisionFactory {
     }
 
     private int directionToValue(BlockFace face) {
-        return switch (face) {
-            case NORTH -> 2;
-            case SOUTH -> 0;
-            case WEST -> 1;
-            case EAST -> 3;
-            default -> -1;
-        };
+        switch (face) {
+            default:
+            case UP:
+            case DOWN:
+                return -1;
+            case NORTH:
+                return 2;
+            case SOUTH:
+                return 0;
+            case WEST:
+                return 1;
+            case EAST:
+                return 3;
+        }
     }
 
     private EnumShape toEnumShape(Shape shape) {
-        return switch (shape) {
-            case INNER_LEFT -> EnumShape.INNER_LEFT;
-            case INNER_RIGHT -> EnumShape.INNER_RIGHT;
-            case OUTER_LEFT -> EnumShape.OUTER_LEFT;
-            case OUTER_RIGHT -> EnumShape.OUTER_RIGHT;
-            default -> EnumShape.STRAIGHT;
-        };
+        switch (shape) {
+            default:
+            case STRAIGHT:
+                return EnumShape.STRAIGHT;
+            case INNER_LEFT:
+                return EnumShape.INNER_LEFT;
+            case INNER_RIGHT:
+                return EnumShape.INNER_RIGHT;
+            case OUTER_LEFT:
+                return EnumShape.OUTER_LEFT;
+            case OUTER_RIGHT:
+                return EnumShape.OUTER_RIGHT;
+        }
     }
 
     enum EnumShape {

src/main/java/ac/grim/grimac/utils/collisions/blocks/PistonBaseCollision.java

@@ -14,13 +14,20 @@ public class PistonBaseCollision implements CollisionFactory {
     public CollisionBox fetch(GrimPlayer player, ClientVersion version, WrappedBlockState block, int x, int y, int z) {
         if (!block.isExtended()) return new SimpleCollisionBox(0, 0, 0, 1, 1, 1, true);
 
-        return switch (block.getFacing()) {
-            case UP -> new HexCollisionBox(0, 0, 0, 16, 12, 16);
-            case NORTH -> new HexCollisionBox(0, 0, 4, 16, 16, 16);
-            case SOUTH -> new HexCollisionBox(0, 0, 0, 16, 16, 12);
-            case WEST -> new HexCollisionBox(4, 0, 0, 16, 16, 16);
-            case EAST -> new HexCollisionBox(0, 0, 0, 12, 16, 16);
-            default -> new HexCollisionBox(0, 4, 0, 16, 16, 16);
-        };
+        switch (block.getFacing()) {
+            default:
+            case DOWN:
+                return new HexCollisionBox(0, 4, 0, 16, 16, 16);
+            case UP:
+                return new HexCollisionBox(0, 0, 0, 16, 12, 16);
+            case NORTH:
+                return new HexCollisionBox(0, 0, 4, 16, 16, 16);
+            case SOUTH:
+                return new HexCollisionBox(0, 0, 0, 16, 16, 12);
+            case WEST:
+                return new HexCollisionBox(4, 0, 0, 16, 16, 16);
+            case EAST:
+                return new HexCollisionBox(0, 0, 0, 12, 16, 16);
+        }
     }
 }