Merge branch 'mc1.15/dev' into mc1.16/dev

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/AbstractContraptionEntity.java

@@ -455,6 +455,8 @@ public abstract class AbstractContraptionEntity extends Entity implements IEntit
 			if (!ticking)
 				contraption.stop(world);
 		}
+		if (contraption != null)
+			contraption.onEntityRemoved(this);
 		super.remove(keepData);
 	}
 

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/Contraption.java

@@ -1,5 +1,30 @@
 package com.simibubi.create.content.contraptions.components.structureMovement;
 
+import static com.simibubi.create.content.contraptions.components.structureMovement.piston.MechanicalPistonBlock.isExtensionPole;
+import static com.simibubi.create.content.contraptions.components.structureMovement.piston.MechanicalPistonBlock.isPistonHead;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.Queue;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.function.BiConsumer;
+import java.util.stream.Collectors;
+
+import javax.annotation.Nullable;
+
+import org.apache.commons.lang3.tuple.MutablePair;
+import org.apache.commons.lang3.tuple.Pair;
+
 import com.simibubi.create.AllBlocks;
 import com.simibubi.create.AllMovementBehaviours;
 import com.simibubi.create.content.contraptions.base.IRotate;
@@ -32,9 +57,22 @@ import com.simibubi.create.foundation.fluid.CombinedTankWrapper;
 import com.simibubi.create.foundation.render.backend.instancing.IFlywheelWorld;
 import com.simibubi.create.foundation.render.backend.light.EmptyLighter;
 import com.simibubi.create.foundation.render.backend.light.GridAlignedBB;
-import com.simibubi.create.foundation.utility.*;
+import com.simibubi.create.foundation.utility.BlockFace;
+import com.simibubi.create.foundation.utility.Coordinate;
+import com.simibubi.create.foundation.utility.Iterate;
+import com.simibubi.create.foundation.utility.NBTHelper;
+import com.simibubi.create.foundation.utility.NBTProcessors;
+import com.simibubi.create.foundation.utility.UniqueLinkedList;
 import com.simibubi.create.foundation.utility.worldWrappers.WrappedWorld;
-import net.minecraft.block.*;
+
+import net.minecraft.block.AbstractButtonBlock;
+import net.minecraft.block.Block;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.block.ChestBlock;
+import net.minecraft.block.DoorBlock;
+import net.minecraft.block.IWaterLoggable;
+import net.minecraft.block.PressurePlateBlock;
 import net.minecraft.block.material.PushReaction;
 import net.minecraft.entity.Entity;
 import net.minecraft.fluid.FluidState;
@@ -54,6 +92,9 @@ import net.minecraft.util.Direction.Axis;
 import net.minecraft.util.Rotation;
 import net.minecraft.util.math.AxisAlignedBB;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.shapes.IBooleanFunction;
+import net.minecraft.util.math.shapes.VoxelShape;
+import net.minecraft.util.math.shapes.VoxelShapes;
 import net.minecraft.util.math.vector.Vector3d;
 import net.minecraft.util.palette.HashMapPalette;
 import net.minecraft.village.PointOfInterestType;
@@ -72,19 +113,10 @@ import net.minecraftforge.fluids.capability.templates.FluidTank;
 import net.minecraftforge.items.IItemHandlerModifiable;
 import net.minecraftforge.items.wrapper.CombinedInvWrapper;
 import net.minecraftforge.registries.GameData;
-import org.apache.commons.lang3.tuple.MutablePair;
-import org.apache.commons.lang3.tuple.Pair;
-
-import javax.annotation.Nullable;
-import java.util.*;
-import java.util.function.BiConsumer;
-import java.util.stream.Collectors;
-
-import static com.simibubi.create.content.contraptions.components.structureMovement.piston.MechanicalPistonBlock.isExtensionPole;
-import static com.simibubi.create.content.contraptions.components.structureMovement.piston.MechanicalPistonBlock.isPistonHead;
 
 public abstract class Contraption {
 
+	public Optional<List<AxisAlignedBB>> simplifiedEntityColliders;
 	public AbstractContraptionEntity entity;
 	public CombinedInvWrapper inventory;
 	public CombinedTankWrapper fluidInventory;
@@ -105,6 +137,8 @@ public abstract class Contraption {
 	private Map<BlockPos, Entity> initialPassengers;
 	private List<BlockFace> pendingSubContraptions;
 
+	private CompletableFuture<Void> simplifiedEntityColliderProvider;
+
 	// Client
 	public Map<BlockPos, TileEntity> presentTileEntities;
 	public List<TileEntity> maybeInstancedTileEntities;
@@ -127,13 +161,12 @@ public abstract class Contraption {
 		specialRenderedTileEntities = new ArrayList<>();
 		pendingSubContraptions = new ArrayList<>();
 		stabilizedSubContraptions = new HashMap<>();
+		simplifiedEntityColliders = Optional.empty();
 	}
 
 	public ContraptionWorld getContraptionWorld() {
-		if (world == null) {
+		if (world == null)
 			world = new ContraptionWorld(entity.world, this);
-		}
-
 		return world;
 	}
 
@@ -160,6 +193,8 @@ public abstract class Contraption {
 		String type = nbt.getString("Type");
 		Contraption contraption = ContraptionType.fromType(type);
 		contraption.readNBT(world, nbt, spawnData);
+		contraption.world = new ContraptionWorld(world, contraption);
+		contraption.gatherBBsOffThread();
 		return contraption;
 	}
 
@@ -223,6 +258,14 @@ public abstract class Contraption {
 			.collect(Collectors.toList());
 		fluidInventory = new CombinedTankWrapper(
 			Arrays.copyOf(fluidHandlers.toArray(), fluidHandlers.size(), IFluidHandler[].class));
+		gatherBBsOffThread();
+	}
+
+	public void onEntityRemoved(AbstractContraptionEntity entity) {
+		if (simplifiedEntityColliderProvider != null) {
+			simplifiedEntityColliderProvider.cancel(false);
+			simplifiedEntityColliderProvider = null;
+		}
 	}
 
 	public void onEntityInitialize(World world, AbstractContraptionEntity contraptionEntity) {
@@ -1136,6 +1179,28 @@ public abstract class Contraption {
 		return new EmptyLighter(this);
 	}
 
+	private void gatherBBsOffThread() {
+		getContraptionWorld();
+		simplifiedEntityColliderProvider = CompletableFuture.supplyAsync(() -> {
+			VoxelShape combinedShape = VoxelShapes.empty();
+			for (Entry<BlockPos, BlockInfo> entry : blocks.entrySet()) {
+				BlockInfo info = entry.getValue();
+				BlockPos localPos = entry.getKey();
+				VoxelShape collisionShape = info.state.getCollisionShape(world, localPos);
+				if (collisionShape.isEmpty())
+					continue;
+				combinedShape = VoxelShapes.combine(combinedShape,
+					collisionShape.withOffset(localPos.getX(), localPos.getY(), localPos.getZ()), IBooleanFunction.OR);
+			}
+			return combinedShape.simplify()
+				.toBoundingBoxList();
+		})
+			.thenAccept(r -> {
+				simplifiedEntityColliders = Optional.of(r);
+				simplifiedEntityColliderProvider = null;
+			});
+	}
+
 	public static float getRadius(Set<BlockPos> blocks, Direction.Axis axis) {
 		switch (axis) {
 		case X:

src/main/java/com/simibubi/create/content/contraptions/components/structureMovement/ContraptionCollider.java

@@ -22,6 +22,7 @@ import com.simibubi.create.foundation.collision.ContinuousOBBCollider.Continuous
 import com.simibubi.create.foundation.collision.Matrix3d;
 import com.simibubi.create.foundation.collision.OrientedBB;
 import com.simibubi.create.foundation.networking.AllPackets;
+import com.simibubi.create.foundation.utility.BlockHelper;
 import com.simibubi.create.foundation.utility.Iterate;
 import com.simibubi.create.foundation.utility.VecHelper;
 
@@ -36,6 +37,8 @@ import net.minecraft.util.Direction;
 import net.minecraft.util.Direction.Axis;
 import net.minecraft.util.Direction.AxisDirection;
 import net.minecraft.util.ReuseableStream;
+import net.minecraft.util.SoundCategory;
+import net.minecraft.util.SoundEvents;
 import net.minecraft.util.math.AxisAlignedBB;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.util.math.MathHelper;
@@ -103,42 +106,56 @@ public class ContraptionCollider {
 			AxisAlignedBB entityBounds = entity.getBoundingBox();
 			Vector3d motion = entity.getMotion();
 			float yawOffset = rotation.getYawOffset();
-
 			Vector3d position = getWorldToLocalTranslation(entity, anchorVec, rotationMatrix, yawOffset);
 
-			// Find all potential block shapes to collide with
+			// Prepare entity bounds
 			AxisAlignedBB localBB = entityBounds.offset(position)
 				.grow(1.0E-7D);
-			ReuseableStream<VoxelShape> potentialHits =
-				getPotentiallyCollidedShapes(world, contraption, localBB.expand(motion));
-			if (potentialHits.createStream()
-				.count() == 0)
-				continue;
-
-			// Prepare entity bounds
 			OrientedBB obb = new OrientedBB(localBB);
 			obb.setRotation(rotationMatrix);
 			motion = motion.subtract(contraptionMotion);
 			motion = rotationMatrix.transform(motion);
 
+			// Use simplified bbs when present 
+			final Vector3d motionCopy = motion;
+			List<AxisAlignedBB> collidableBBs = contraption.simplifiedEntityColliders.orElseGet(() -> {
+
+				// Else find 'nearby' individual block shapes to collide with
+				List<AxisAlignedBB> bbs = new ArrayList<>();
+				ReuseableStream<VoxelShape> potentialHits =
+					getPotentiallyCollidedShapes(world, contraption, localBB.expand(motionCopy));
+				potentialHits.createStream()
+					.forEach(shape -> shape.toBoundingBoxList()
+						.forEach(bbs::add));
+				return bbs;
+
+			});
+
 			MutableObject<Vector3d> collisionResponse = new MutableObject<>(Vector3d.ZERO);
+			MutableObject<Vector3d> normal = new MutableObject<>(Vector3d.ZERO);
+			MutableObject<Vector3d> location = new MutableObject<>(Vector3d.ZERO);
 			MutableBoolean surfaceCollision = new MutableBoolean(false);
 			MutableFloat temporalResponse = new MutableFloat(1);
 			Vector3d obbCenter = obb.getCenter();
 
 			// Apply separation maths
-			List<AxisAlignedBB> bbs = new ArrayList<>();
-			potentialHits.createStream()
-				.forEach(shape -> shape.toBoundingBoxList()
-					.forEach(bbs::add));
-
 			boolean doHorizontalPass = !rotation.hasVerticalRotation();
 			for (boolean horizontalPass : Iterate.trueAndFalse) {
 				boolean verticalPass = !horizontalPass || !doHorizontalPass;
 
-				for (AxisAlignedBB bb : bbs) {
+				for (AxisAlignedBB bb : collidableBBs) {
 					Vector3d currentResponse = collisionResponse.getValue();
-					obb.setCenter(obbCenter.add(currentResponse));
+					Vector3d currentCenter = obbCenter.add(currentResponse);
+
+					if (Math.abs(currentCenter.x - bb.getCenter().x) - entityBounds.getXSize() - 1 > bb.getXSize() / 2)
+						continue;
+					if (Math.abs((currentCenter.y + motion.y) - bb.getCenter().y) - entityBounds.getYSize()
+						- 1 > bb.getYSize() / 2)
+						continue;
+					if (Math.abs(currentCenter.z - bb.getCenter().z) - entityBounds.getZSize() - 1 > bb.getZSize() / 2)
+						continue;
+
+					obb.setCenter(currentCenter);
 					ContinuousSeparationManifold intersect = obb.intersect(bb, motion);
 
 					if (intersect == null)
@@ -147,15 +164,28 @@ public class ContraptionCollider {
 						surfaceCollision.setValue(intersect.isSurfaceCollision());
 
 					double timeOfImpact = intersect.getTimeOfImpact();
-					if (timeOfImpact > 0 && timeOfImpact < 1) {
+					boolean isTemporal = timeOfImpact > 0 && timeOfImpact < 1;
-						if (temporalResponse.getValue() > timeOfImpact)
+					Vector3d collidingNormal = intersect.getCollisionNormal();
-							temporalResponse.setValue(timeOfImpact);
+					Vector3d collisionPosition = intersect.getCollisionPosition();
-						continue;
+
+					if (!isTemporal) {
+						Vector3d separation = intersect.asSeparationVec(entity.stepHeight);
+						if (separation != null && !separation.equals(Vector3d.ZERO)) {
+							collisionResponse.setValue(currentResponse.add(separation));
+							timeOfImpact = 0;
+						}
 					}
 
-					Vector3d separation = intersect.asSeparationVec(entity.stepHeight);
+					boolean nearest = timeOfImpact >= 0 && temporalResponse.getValue() > timeOfImpact;
-					if (separation != null && !separation.equals(Vector3d.ZERO))
+					if (collidingNormal != null && nearest)
-						collisionResponse.setValue(currentResponse.add(separation));
+						normal.setValue(collidingNormal);
+					if (collisionPosition != null && nearest)
+						location.setValue(collisionPosition);
+
+					if (isTemporal) {
+						if (temporalResponse.getValue() > timeOfImpact)
+							temporalResponse.setValue(timeOfImpact);
+					}
 				}
 
 				if (verticalPass)
@@ -174,6 +204,9 @@ public class ContraptionCollider {
 
 			// Resolve collision
 			Vector3d entityMotion = entity.getMotion();
+			Vector3d entityMotionNoTemporal = entityMotion;
+			Vector3d collisionNormal = normal.getValue();
+			Vector3d collisionLocation = location.getValue();
 			Vector3d totalResponse = collisionResponse.getValue();
 			boolean hardCollision = !totalResponse.equals(Vector3d.ZERO);
 			boolean temporalCollision = temporalResponse.getValue() != 1;
@@ -186,8 +219,47 @@ public class ContraptionCollider {
 				.add(contraptionMotion);
 			totalResponse = rotationMatrix.transform(totalResponse);
 			totalResponse = VecHelper.rotate(totalResponse, yawOffset, Axis.Y);
+			collisionNormal = rotationMatrix.transform(collisionNormal);
+			collisionNormal = VecHelper.rotate(collisionNormal, yawOffset, Axis.Y);
+			collisionLocation = rotationMatrix.transform(collisionLocation);
+			collisionLocation = VecHelper.rotate(collisionLocation, yawOffset, Axis.Y);
 			rotationMatrix.transpose();
 
+			double bounce = 0;
+			double slide = 0;
+
+			if (!collisionLocation.equals(Vector3d.ZERO)) {
+				collisionLocation = collisionLocation.add(entity.getPositionVec()
+					.add(entity.getBoundingBox()
+						.getCenter())
+					.scale(.5f));
+				if (temporalCollision)
+					collisionLocation = collisionLocation.add(0, motionResponse.y, 0);
+				BlockPos pos = new BlockPos(contraptionEntity.toLocalVector(collisionLocation, 0));
+				if (contraption.getBlocks()
+					.containsKey(pos)) {
+					BlockState blockState = contraption.getBlocks()
+						.get(pos).state;
+					bounce = BlockHelper.getBounceMultiplier(blockState.getBlock());
+					slide = Math.max(0, blockState.getSlipperiness(contraption.world, pos, entity) - .6f);
+				}
+			}
+
+			boolean hasNormal = !collisionNormal.equals(Vector3d.ZERO);
+			boolean anyCollision = hardCollision || temporalCollision;
+
+			if (bounce > 0 && hasNormal && anyCollision) {
+				collisionNormal = collisionNormal.normalize();
+				Vector3d newNormal = collisionNormal.crossProduct(collisionNormal.crossProduct(entityMotionNoTemporal))
+					.normalize();
+				if (bounceEntity(entity, newNormal, contraptionEntity, bounce)) {
+					entity.world.playSound(playerType == PlayerType.CLIENT ? (PlayerEntity) entity : null,
+						entity.getX(), entity.getY(), entity.getZ(), SoundEvents.BLOCK_SLIME_BLOCK_FALL,
+						SoundCategory.BLOCKS, .5f, 1);
+					continue;
+				}
+			}
+
 			if (temporalCollision) {
 				double idealVerticalMotion = motionResponse.y;
 				if (idealVerticalMotion != entityMotion.y) {
@@ -215,6 +287,18 @@ public class ContraptionCollider {
 					entityMotion = entityMotion.mul(1, 1, 0);
 			}
 
+			if (bounce == 0 && slide > 0 && hasNormal && anyCollision && rotation.hasVerticalRotation()) {
+				collisionNormal = collisionNormal.normalize();
+				Vector3d motionIn = entityMotionNoTemporal.mul(0, 1, 0)
+					.add(0, -.01f, 0);
+				Vector3d slideNormal = collisionNormal.crossProduct(motionIn.crossProduct(collisionNormal))
+					.normalize();
+				entity.setMotion(entityMotion.mul(.8, 0, .8)
+					.add(slideNormal.scale((.2f + slide) * motionIn.length())
+						.add(0, -0.1, 0)));
+				entityMotion = entity.getMotion();
+			}
+
 			if (!hardCollision && surfaceCollision.isFalse())
 				continue;
 
@@ -228,10 +312,14 @@ public class ContraptionCollider {
 
 			if (surfaceCollision.isTrue()) {
 				entity.fallDistance = 0;
-				entity.setOnGround(true);
 				contraptionEntity.collidingEntities.put(entity, new MutableInt(0));
-				if (entity instanceof ItemEntity)
+				boolean canWalk = bounce != 0 || slide == 0;
-					entityMotion = entityMotion.mul(.5f, 1, .5f);
+				if (canWalk || !rotation.hasVerticalRotation()) {
+					if (canWalk)
+						entity.onGround = true;
+					if (entity instanceof ItemEntity)
+						entityMotion = entityMotion.mul(.5f, 1, .5f);
+				}
 				contactPointMotion = contraptionEntity.getContactPointMotion(entityPosition);
 				allowedMovement = getAllowedMovement(contactPointMotion, entity);
 				entity.setPosition(entityPosition.x + allowedMovement.x, entityPosition.y,
@@ -253,6 +341,42 @@ public class ContraptionCollider {
 
 	}
 
+	static boolean bounceEntity(Entity entity, Vector3d normal, AbstractContraptionEntity contraption, double factor) {
+		if (factor == 0)
+			return false;
+		if (entity.bypassesLandingEffects())
+			return false;
+		if (normal.equals(Vector3d.ZERO))
+			return false;
+
+		Vector3d contraptionVec = Vector3d.ZERO;
+		Vector3d contactPointMotion = contraption.getContactPointMotion(entity.getPositionVec());
+		Vector3d motion = entity.getMotion()
+			.subtract(contactPointMotion);
+
+		Vector3d v2 = motion.crossProduct(normal)
+			.normalize();
+		if (v2 != Vector3d.ZERO)
+			contraptionVec = normal.scale(contraptionVec.dotProduct(normal))
+				.add(v2.scale(contraptionVec.dotProduct(v2)));
+		else
+			v2 = normal.crossProduct(normal.add(Math.random(), Math.random(), Math.random()))
+				.normalize();
+
+		Vector3d v3 = normal.crossProduct(v2);
+		motion = motion.subtract(contraptionVec);
+		Vector3d lr = new Vector3d(factor * motion.dotProduct(normal), -motion.dotProduct(v2), -motion.dotProduct(v3));
+
+		if (lr.dotProduct(lr) > 1 / 16f) {
+			Vector3d newMot = contactPointMotion.add(normal.x * lr.x + v2.x * lr.y + v3.x * lr.z,
+				normal.y * lr.x + v2.y * lr.y + v3.y * lr.z, normal.z * lr.x + v2.z * lr.y + v3.z * lr.z);
+			entity.setMotion(newMot);
+			return true;
+		}
+
+		return false;
+	}
+
 	public static Vector3d getWorldToLocalTranslation(Entity entity, AbstractContraptionEntity contraptionEntity) {
 		return getWorldToLocalTranslation(entity, contraptionEntity.getAnchorVec(), contraptionEntity.getRotationState());
 	}

src/main/java/com/simibubi/create/foundation/collision/ContinuousOBBCollider.java

@@ -36,24 +36,25 @@ public class ContinuousOBBCollider extends OBBCollider {
 		checkCount = 0;
 		mf.stepSeparationAxis = uB1;
 		mf.stepSeparation = Double.MAX_VALUE;
+		mf.normalSeparation = Double.MAX_VALUE;
 
 		if (
 		// Separate along A's local axes (global XYZ)
-		!(separate(mf, uA0, diff.x, eA.x, a00 * eB.x + a01 * eB.y + a02 * eB.z, motion.x)
+		!(separate(mf, uA0, diff.x, eA.x, a00 * eB.x + a01 * eB.y + a02 * eB.z, motion.x, true)
-			|| separate(mf, uA1, diff.y, eA.y, a10 * eB.x + a11 * eB.y + a12 * eB.z, motion.y)
+			|| separate(mf, uA1, diff.y, eA.y, a10 * eB.x + a11 * eB.y + a12 * eB.z, motion.y, true)
-			|| separate(mf, uA2, diff.z, eA.z, a20 * eB.x + a21 * eB.y + a22 * eB.z, motion.z)
+			|| separate(mf, uA2, diff.z, eA.z, a20 * eB.x + a21 * eB.y + a22 * eB.z, motion.z, true)
 
 			// Separate along B's local axes
-			|| separate(mf, uB0, diff2.x, eA.x * a00 + eA.y * a10 + eA.z * a20, eB.x, motion2.x)
+			|| separate(mf, uB0, diff2.x, eA.x * a00 + eA.y * a10 + eA.z * a20, eB.x, motion2.x, false)
-			|| separate(mf, uB1, diff2.y, eA.x * a01 + eA.y * a11 + eA.z * a21, eB.y, motion2.y)
+			|| separate(mf, uB1, diff2.y, eA.x * a01 + eA.y * a11 + eA.z * a21, eB.y, motion2.y, false)
-			|| separate(mf, uB2, diff2.z, eA.x * a02 + eA.y * a12 + eA.z * a22, eB.z, motion2.z)))
+			|| separate(mf, uB2, diff2.z, eA.x * a02 + eA.y * a12 + eA.z * a22, eB.z, motion2.z, false)))
 			return mf;
 
 		return null;
 	}
 
 	static boolean separate(ContinuousSeparationManifold mf, Vector3d axis, double TL, double rA, double rB,
-		double projectedMotion) {
+		double projectedMotion, boolean axisOfObjA) {
 		checkCount++;
 		double distance = abs(TL);
 		double diff = distance - (rA + rB);
@@ -82,7 +83,12 @@ public class ContinuousOBBCollider extends OBBCollider {
 		Vector3d normalizedAxis = axis.normalize();
 
 		boolean isBestSeperation = distance != 0 && -(diff) <= abs(mf.separation);
-//		boolean isBestSeperation = discreteCollision && checkCount == 5; // Debug specific separations
+		// boolean isBestSeperation = discreteCollision && checkCount == 5; // Debug specific separations
+
+		if (axisOfObjA && distance != 0 && -(diff) <= abs(mf.normalSeparation)) {
+			mf.normalAxis = normalizedAxis;
+			mf.normalSeparation = seperation;
+		}
 
 		double dot = mf.stepSeparationAxis.dotProduct(axis);
 		if (dot != 0 && discreteCollision) {
@@ -98,45 +104,19 @@ public class ContinuousOBBCollider extends OBBCollider {
 				stepSeparationVec =
 					sepVec.subtract(axisPlane.scale(sepVec.dotProduct(stepPlane) / axisPlane.dotProduct(stepPlane)));
 				stepSeparation = stepSeparationVec.length();
-
+				if (abs(mf.stepSeparation) > abs(stepSeparation) && stepSeparation != 0)
-
-				if (abs(mf.stepSeparation) > abs(stepSeparation) && stepSeparation != 0) {
-//					CollisionDebugger.showDebugLine(Vector3d.ZERO, sepVec, 0x111155, "stepsep", -16);
 					mf.stepSeparation = stepSeparation;
-				}
 
 			} else {
-				if (abs(mf.stepSeparation) > stepSeparation) {
+				if (abs(mf.stepSeparation) > stepSeparation)
 					mf.stepSeparation = stepSeparation;
-//					CollisionDebugger.showDebugLine(Vector3d.ZERO, stepSeparationVec, 0xff9999, "axis", -16);
-				}
 			}
-
-//			if (abs(mf.separation) < abs(stepSeparation) && stepSeparation != 0)
 		}
 
 		if (isBestSeperation) {
-
 			mf.axis = normalizedAxis;
 			mf.separation = seperation;
-
+			mf.collisionPosition = normalizedAxis.scale(signum(TL) * (axisOfObjA ? -rB : -rB) - signum(seperation) * .125f);
-			// Visualize values
-//			if (CollisionDebugger.AABB != null) {
-//				Vector3d normalizedAxis = axis.normalize();
-//				showDebugLine(Vector3d.ZERO, normalizedAxis.scale(projectedMotion), 0x111155, "motion", 5);
-//				showDebugLine(Vector3d.ZERO, normalizedAxis.scale(TL), 0xbb00bb, "tl", 4);
-//				showDebugLine(Vector3d.ZERO, normalizedAxis.scale(sTL * rA), 0xff4444, "ra", 3);
-//				showDebugLine(normalizedAxis.scale(sTL * rA),
-//					normalizedAxis.scale(sTL * rA - entryTime * projectedMotion), 0x44ff44, "entry", 0);
-//				showDebugLine(normalizedAxis.scale(sTL * rA - entryTime * projectedMotion),
-//					normalizedAxis.scale(sTL * rA - entryTime * projectedMotion + exitTime * projectedMotion), 0x44ffff,
-//					"exit", -1);
-//				showDebugLine(normalizedAxis.scale(sTL * (distance - rB)), normalizedAxis.scale(TL), 0x4444ff, "rb", 2);
-//				showDebugLine(normalizedAxis.scale(sTL * (distance - rB)),
-//					normalizedAxis.scale(sTL * (distance - rB) + value), 0xff9966, "separation", 1);
-////				System.out.println("TL:" + TL + ", rA: " + rA + ", rB: " + rB);
-//			}
-
 		}
 
 		return false;
@@ -148,10 +128,14 @@ public class ContinuousOBBCollider extends OBBCollider {
 		double latestCollisionEntryTime = UNDEFINED;
 		double earliestCollisionExitTime = Double.MAX_VALUE;
 		boolean isDiscreteCollision = true;
+		Vector3d collisionPosition;
 
 		Vector3d stepSeparationAxis;
 		double stepSeparation;
 
+		Vector3d normalAxis;
+		double normalSeparation;
+
 		public double getTimeOfImpact() {
 			if (latestCollisionEntryTime == UNDEFINED)
 				return UNDEFINED;
@@ -164,6 +148,14 @@ public class ContinuousOBBCollider extends OBBCollider {
 			return true;
 		}
 
+		public Vector3d getCollisionNormal() {
+			return normalAxis == null ? null : createSeparationVec(normalSeparation, normalAxis);
+		}
+		
+		public Vector3d getCollisionPosition() {
+			return collisionPosition;
+		}
+
 		public Vector3d asSeparationVec(double obbStepHeight) {
 			if (isDiscreteCollision) {
 				if (stepSeparation <= obbStepHeight)

src/main/java/com/simibubi/create/foundation/mixin/StepSoundMixin.java

@@ -16,6 +16,7 @@ import net.minecraft.util.math.vector.Vector3d;
 import net.minecraft.world.World;
 import net.minecraft.world.gen.feature.template.Template;
 import org.apache.logging.log4j.util.TriConsumer;
+import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
@@ -30,10 +31,12 @@ import java.util.stream.Collectors;
 
 @Mixin(Entity.class)
 public abstract class StepSoundMixin {
+	private final Entity self = (Entity) (Object) this;
 
 	@Shadow
 	public World world;
 
+	@Final
 	@Shadow
 	protected Random rand;
 
@@ -55,21 +58,20 @@ public abstract class StepSoundMixin {
 	@Shadow
 	protected abstract void playStepSound(BlockPos p_180429_1_, BlockState p_180429_2_);
 
-	private Set<AbstractContraptionEntity> getIntersectingContraptions(Entity entity) {
+	private Set<AbstractContraptionEntity> getIntersectingContraptions() {
-		Set<AbstractContraptionEntity> contraptions = ContraptionHandler.loadedContraptions.get(entity.world)
+		Set<AbstractContraptionEntity> contraptions = ContraptionHandler.loadedContraptions.get(this.world)
 			.values()
 			.stream()
 			.map(Reference::get)
-			.filter(cEntity -> cEntity != null && cEntity.collidingEntities.containsKey(entity))
+			.filter(cEntity -> cEntity != null && cEntity.collidingEntities.containsKey(self))
 			.collect(Collectors.toSet());
 
-		contraptions.addAll(entity.world.getEntitiesWithinAABB(AbstractContraptionEntity.class, getBoundingBox().grow(1f)));
+		contraptions.addAll(this.world.getEntitiesWithinAABB(AbstractContraptionEntity.class, getBoundingBox().grow(1f)));
 		return contraptions;
 	}
 
 	private void forCollision(Vector3d anchorPos, TriConsumer<Contraption, BlockState, BlockPos> action) {
-		Entity thi = (Entity) (Object) this;
+		getIntersectingContraptions().forEach(cEntity -> {
-		getIntersectingContraptions(thi).forEach(cEntity -> {
 			Vector3d localPos = ContraptionCollider.getWorldToLocalTranslation(anchorPos, cEntity);
 
 			localPos = anchorPos.add(localPos);
@@ -87,15 +89,14 @@ public abstract class StepSoundMixin {
 
 	@Inject(at = @At(
 		value = "JUMP",
-		opcode = 154, //IFNE
+		opcode = 154, // IFNE line 587 injecting before `!blockstate.isAir(this.world, blockpos)`
 		ordinal = 4
 	),
 		method = "move"
 	)
 	private void movementMixin(MoverType mover, Vector3d movement, CallbackInfo ci) {
-		Entity thi = (Entity) (Object) this;
 		World entityWorld = world;
-		Vector3d worldPos = thi.getPositionVec().add(0, -0.2, 0);
+		Vector3d worldPos = self.getPositionVec().add(0, -0.2, 0);
 		AtomicBoolean stepped = new AtomicBoolean(false);
 
 		forCollision(worldPos, (contraption, blockstate, blockPos) -> {
@@ -110,19 +111,18 @@ public abstract class StepSoundMixin {
 		world = entityWorld;
 	}
 
-	@Inject(method = {"Lnet/minecraft/entity/Entity;spawnSprintingParticles()V"}, at = @At(value = "TAIL"))
+	@Inject(method = {"spawnSprintingParticles"}, at = @At(value = "TAIL"))
 	private void createRunningParticlesMixin(CallbackInfo ci) {
-		Entity thi = (Entity) (Object) this;
+		Vector3d worldPos = self.getPositionVec().add(0, -0.2, 0);
-		Vector3d worldPos = thi.getPositionVec().add(0, -0.2, 0);
 		BlockPos pos = new BlockPos(worldPos); // pos where particles are spawned
 
 		forCollision(worldPos, (contraption, blockstate, blockpos) -> {
-			if (!blockstate.addRunningEffects(world, blockpos, thi) && blockstate.getRenderType() != BlockRenderType.INVISIBLE) {
+			if (!blockstate.addRunningEffects(world, blockpos, self) && blockstate.getRenderType() != BlockRenderType.INVISIBLE) {
-				Vector3d Vector3d = thi.getMotion();
+				Vector3d vec3d = self.getMotion();
 				this.world.addParticle(new BlockParticleData(ParticleTypes.BLOCK, blockstate).setPos(pos),
-					thi.getX() + ((double) rand.nextFloat() - 0.5D) * (double) thi.getWidth(),
+					self.getX() + ((double) rand.nextFloat() - 0.5D) * (double) self.getWidth(),
-					thi.getY() + 0.1D, thi.getZ() + ((double) rand.nextFloat() - 0.5D) * (double) thi.getWidth(),
+					self.getY() + 0.1D, self.getZ() + ((double) rand.nextFloat() - 0.5D) * (double) self.getWidth(),
-					Vector3d.x * -4.0D, 1.5D, Vector3d.z * -4.0D);
+					vec3d.x * -4.0D, 1.5D, vec3d.z * -4.0D);
 			}
 		});
 	}

src/main/java/com/simibubi/create/foundation/utility/BlockHelper.java

@@ -8,10 +8,13 @@ import org.apache.commons.lang3.mutable.MutableInt;
 
 import com.simibubi.create.AllBlocks;
 import com.simibubi.create.content.contraptions.base.KineticTileEntity;
+import com.simibubi.create.content.contraptions.components.actors.SeatBlock;
 
+import net.minecraft.block.BedBlock;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.Blocks;
+import net.minecraft.block.SlimeBlock;
 import net.minecraft.client.particle.DiggingParticle;
 import net.minecraft.client.particle.ParticleManager;
 import net.minecraft.client.world.ClientWorld;
@@ -261,6 +264,14 @@ public class BlockHelper {
 		}
 	}
 	
+	public static double getBounceMultiplier(Block block) {
+		if (block instanceof SlimeBlock)
+			return 0.8D;
+		if (block instanceof BedBlock || block instanceof SeatBlock)
+			return 0.66 * 0.8D;
+		return 0;
+	}
+
 	public static boolean hasBlockSolidSide(BlockState p_220056_0_, IBlockReader p_220056_1_, BlockPos p_220056_2_, Direction p_220056_3_) {
 		return !p_220056_0_.isIn(BlockTags.LEAVES) && Block.doesSideFillSquare(p_220056_0_.getCollisionShape(p_220056_1_, p_220056_2_), p_220056_3_);
 	}

src/main/resources/create.mixins.json

@@ -4,7 +4,6 @@
     "package": "com.simibubi.create.foundation.mixin",
     "compatibilityLevel": "JAVA_8",
     "refmap": "create.refmap.json",
-    "mixins": ["StepSoundMixin"],
     "client": [
         "TileWorldHookMixin",
         "CancelTileEntityRenderMixin",
@@ -13,7 +12,8 @@
         "NetworkLightUpdateMixin",
         "RenderHooksMixin",
         "ShaderCloseMixin",
-        "TileRemoveMixin"
+        "TileRemoveMixin",
+        "StepSoundMixin"
     ],
     "injectors": {
         "defaultRequire": 1