Hot belt replace

- The Wrench can now be used to shorten or divide Mechanical Belts
- Belt Connectors can now be used to extend or merge Mechanical Belts

src/main/java/com/simibubi/create/content/contraptions/relays/belt/BeltBlock.java

@@ -13,6 +13,7 @@ import com.simibubi.create.Create;
 import com.simibubi.create.content.contraptions.base.HorizontalKineticBlock;
 import com.simibubi.create.content.contraptions.base.KineticTileEntity;
 import com.simibubi.create.content.contraptions.processing.EmptyingByBasin;
+import com.simibubi.create.content.contraptions.relays.belt.BeltSlicer.Feedback;
 import com.simibubi.create.content.contraptions.relays.belt.BeltTileEntity.CasingType;
 import com.simibubi.create.content.contraptions.relays.belt.transport.BeltMovementHandler.TransportedEntityInfo;
 import com.simibubi.create.content.contraptions.relays.belt.transport.BeltTunnelInteractionHandler;
@@ -96,7 +97,8 @@ public class BeltBlock extends HorizontalKineticBlock implements ITE<BeltTileEnt
 
 	@Override
 	protected boolean areStatesKineticallyEquivalent(BlockState oldState, BlockState newState) {
-		return super.areStatesKineticallyEquivalent(oldState, newState) && oldState.getValue(PART) == newState.getValue(PART);
+		return super.areStatesKineticallyEquivalent(oldState, newState)
+			&& oldState.getValue(PART) == newState.getValue(PART);
 	}
 
 	@Override
@@ -104,7 +106,7 @@ public class BeltBlock extends HorizontalKineticBlock implements ITE<BeltTileEnt
 		if (face.getAxis() != getRotationAxis(state))
 			return false;
 		return getTileEntityOptional(world, pos).map(BeltTileEntity::hasPulley)
-				.orElse(false);
+			.orElse(false);
 	}
 
 	@Override
@@ -122,15 +124,6 @@ public class BeltBlock extends HorizontalKineticBlock implements ITE<BeltTileEnt
 		return AllItems.BELT_CONNECTOR.asStack();
 	}
 
-	/*
-	 * FIXME
-	 *
-	 * @Override
-	 * public Material getMaterial(BlockState state) {
-	 * return state.get(CASING) ? Material.WOOD : Material.WOOL;
-	 * }
-	 */
-
 	@SuppressWarnings("deprecation")
 	@Override
 	public List<ItemStack> getDrops(BlockState state, net.minecraft.loot.LootContext.Builder builder) {
@@ -241,6 +234,9 @@ public class BeltBlock extends HorizontalKineticBlock implements ITE<BeltTileEnt
 		if (player.isShiftKeyDown() || !player.mayBuild())
 			return ActionResultType.PASS;
 		ItemStack heldItem = player.getItemInHand(handIn);
+
+		boolean isWrench = AllItems.WRENCH.isIn(heldItem);
+		boolean isConnector = AllItems.BELT_CONNECTOR.isIn(heldItem);
 		boolean isShaft = AllBlocks.SHAFT.isIn(heldItem);
 		boolean isDye = Tags.Items.DYES.contains(heldItem.getItem());
 		boolean hasWater = EmptyingByBasin.emptyItem(world, heldItem, true)
@@ -255,6 +251,11 @@ public class BeltBlock extends HorizontalKineticBlock implements ITE<BeltTileEnt
 			return ActionResultType.SUCCESS;
 		}
 
+		if (isConnector)
+			return BeltSlicer.useConnector(state, world, pos, player, handIn, hit, new Feedback());
+		if (isWrench)
+			return BeltSlicer.useWrench(state, world, pos, player, handIn, hit, new Feedback());
+
 		BeltTileEntity belt = BeltHelper.getSegmentTE(world, pos);
 		if (belt == null)
 			return ActionResultType.PASS;
@@ -274,7 +275,7 @@ public class BeltBlock extends HorizontalKineticBlock implements ITE<BeltTileEnt
 				});
 			if (success.isTrue())
 				world.playSound(null, pos, SoundEvents.ITEM_PICKUP, SoundCategory.PLAYERS, .2f,
-						1f + Create.RANDOM.nextFloat());
+					1f + Create.RANDOM.nextFloat());
 		}
 
 		if (isShaft) {
@@ -329,7 +330,7 @@ public class BeltBlock extends HorizontalKineticBlock implements ITE<BeltTileEnt
 			return ActionResultType.SUCCESS;
 		}
 
-		return ActionResultType.FAIL;
+		return ActionResultType.PASS;
 	}
 
 	@Override
@@ -378,7 +379,8 @@ public class BeltBlock extends HorizontalKineticBlock implements ITE<BeltTileEnt
 				return BeltShapes.getCollisionShape(state);
 			return shape;
 
-		}).orElse(shape);
+		})
+			.orElse(shape);
 	}
 
 	@Override
@@ -499,8 +501,8 @@ public class BeltBlock extends HorizontalKineticBlock implements ITE<BeltTileEnt
 	}
 
 	@Override
-	public BlockState updateShape(BlockState state, Direction side, BlockState p_196271_3_, IWorld world,
-		BlockPos pos, BlockPos p_196271_6_) {
+	public BlockState updateShape(BlockState state, Direction side, BlockState p_196271_3_, IWorld world, BlockPos pos,
+		BlockPos p_196271_6_) {
 		if (side.getAxis()
 			.isHorizontal())
 			updateTunnelConnections(world, pos.above());
@@ -552,29 +554,6 @@ public class BeltBlock extends HorizontalKineticBlock implements ITE<BeltTileEnt
 	}
 
 	public static boolean canAccessFromSide(Direction facing, BlockState belt) {
-//		if (facing == null)
-//			return true;
-//		if (!belt.get(BeltBlock.CASING))
-//			return false;
-//		BeltPart part = belt.get(BeltBlock.PART);
-//		if (part != BeltPart.MIDDLE && facing.getAxis() == belt.get(HORIZONTAL_FACING)
-//			.rotateY()
-//			.getAxis())
-//			return false;
-//
-//		BeltSlope slope = belt.get(BeltBlock.SLOPE);
-//		if (slope != BeltSlope.HORIZONTAL) {
-//			if (slope == BeltSlope.DOWNWARD && part == BeltPart.END)
-//				return true;
-//			if (slope == BeltSlope.UPWARD && part == BeltPart.START)
-//				return true;
-//			Direction beltSide = belt.get(HORIZONTAL_FACING);
-//			if (slope == BeltSlope.DOWNWARD)
-//				beltSide = beltSide.getOpposite();
-//			if (beltSide == facing)
-//				return false;
-//		}
-
 		return true;
 	}
 

src/main/java/com/simibubi/create/content/contraptions/relays/belt/BeltHelper.java

@@ -3,6 +3,7 @@ package com.simibubi.create.content.contraptions.relays.belt;
 import com.simibubi.create.AllTags.AllItemTags;
 import com.simibubi.create.foundation.utility.VecHelper;
 
+import net.minecraft.block.BlockState;
 import net.minecraft.item.ItemStack;
 import net.minecraft.tileentity.TileEntity;
 import net.minecraft.util.math.BlockPos;
@@ -75,7 +76,8 @@ public class BeltHelper {
 		verticalMovement = verticalMovement * (Math.min(offset, controller.beltLength - .5f) - .5f);
 		Vector3d vec = VecHelper.getCenterOf(controller.getBlockPos());
 		Vector3d horizontalMovement = Vector3d.atLowerCornerOf(controller.getBeltFacing()
-			.getNormal()).scale(offset - .5f);
+			.getNormal())
+			.scale(offset - .5f);
 
 		if (slope == BeltSlope.VERTICAL)
 			horizontalMovement = Vector3d.ZERO;
@@ -85,4 +87,16 @@ public class BeltHelper {
 		return vec;
 	}
 
+	public static Vector3d getBeltVector(BlockState state) {
+		BeltSlope slope = state.getValue(BeltBlock.SLOPE);
+		int verticality = slope == BeltSlope.DOWNWARD ? -1 : slope == BeltSlope.UPWARD ? 1 : 0;
+		Vector3d horizontalMovement = Vector3d.atLowerCornerOf(state.getValue(BeltBlock.HORIZONTAL_FACING)
+			.getNormal());
+		if (slope == BeltSlope.VERTICAL)
+			return new Vector3d(0, state.getValue(BeltBlock.HORIZONTAL_FACING)
+				.getAxisDirection()
+				.getStep(), 0);
+		return new Vector3d(0, verticality, 0).add(horizontalMovement);
+	}
+
 }

src/main/java/com/simibubi/create/content/contraptions/relays/belt/BeltRenderer.java

@@ -301,8 +301,8 @@ public class BeltRenderer extends SafeTileEntityRenderer<BeltTileEntity> {
 
 	protected int getPackedLight(BeltTileEntity controller, float beltPos) {
 		int segment = (int) Math.floor(beltPos) * 2;
-
-		if (controller.light == null || segment >= controller.light.length) return 0;
+		if (controller.light == null || segment >= controller.light.length || segment < 0)
+			return 0;
 
 		return (controller.light[segment + 1] << 20) | (controller.light[segment] << 4);
 	}

src/main/java/com/simibubi/create/content/contraptions/relays/belt/BeltSlicer.java

@@ -0,0 +1,472 @@
+package com.simibubi.create.content.contraptions.relays.belt;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Optional;
+
+import com.simibubi.create.AllBlocks;
+import com.simibubi.create.AllItems;
+import com.simibubi.create.CreateClient;
+import com.simibubi.create.content.contraptions.base.KineticTileEntity;
+import com.simibubi.create.content.contraptions.relays.belt.BeltTileEntity.CasingType;
+import com.simibubi.create.content.contraptions.relays.belt.item.BeltConnectorItem;
+import com.simibubi.create.content.contraptions.relays.belt.transport.BeltInventory;
+import com.simibubi.create.content.contraptions.relays.belt.transport.TransportedItemStack;
+import com.simibubi.create.foundation.utility.Lang;
+import com.simibubi.create.foundation.utility.VecHelper;
+
+import net.minecraft.block.Block;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.Blocks;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.world.ClientWorld;
+import net.minecraft.entity.item.ItemEntity;
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.DyeColor;
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.ActionResultType;
+import net.minecraft.util.Direction;
+import net.minecraft.util.Direction.Axis;
+import net.minecraft.util.Hand;
+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.BlockRayTraceResult;
+import net.minecraft.util.math.RayTraceResult;
+import net.minecraft.util.math.vector.Vector3d;
+import net.minecraft.util.text.StringTextComponent;
+import net.minecraft.util.text.TextFormatting;
+import net.minecraft.world.World;
+import net.minecraftforge.api.distmarker.Dist;
+import net.minecraftforge.api.distmarker.OnlyIn;
+import net.minecraftforge.common.util.Constants.BlockFlags;
+
+public class BeltSlicer {
+
+	public static class Feedback {
+		int color = 0xffffff;
+		AxisAlignedBB bb;
+		String langKey;
+		TextFormatting formatting = TextFormatting.WHITE;
+	}
+
+	public static ActionResultType useWrench(BlockState state, World world, BlockPos pos, PlayerEntity player,
+		Hand handIn, BlockRayTraceResult hit, Feedback feedBack) {
+		BeltTileEntity controllerTE = BeltHelper.getControllerTE(world, pos);
+		if (controllerTE == null)
+			return ActionResultType.PASS;
+		if (state.getValue(BeltBlock.CASING) && hit.getDirection() != Direction.UP)
+			return ActionResultType.PASS;
+		if (state.getValue(BeltBlock.PART) == BeltPart.PULLEY && hit.getDirection()
+			.getAxis() != Axis.Y)
+			return ActionResultType.PASS;
+
+		int beltLength = controllerTE.beltLength;
+		if (beltLength == 2)
+			return ActionResultType.FAIL;
+
+		BlockPos beltVector = new BlockPos(BeltHelper.getBeltVector(state));
+		BeltPart part = state.getValue(BeltBlock.PART);
+		List<BlockPos> beltChain = BeltBlock.getBeltChain(world, controllerTE.getBlockPos());
+		boolean creative = player.isCreative();
+		
+		// Shorten from End
+		if (hoveringEnd(state, hit)) {
+			if (world.isClientSide) 
+				return ActionResultType.SUCCESS;
+
+			for (BlockPos blockPos : beltChain) {
+				BeltTileEntity belt = BeltHelper.getSegmentTE(world, blockPos);
+				if (belt == null)
+					continue;
+				belt.detachKinetics();
+				belt.invalidateItemHandler();
+				belt.beltLength = 0;
+			}
+
+			BeltInventory inventory = controllerTE.inventory;
+			BlockPos next = part == BeltPart.END ? pos.subtract(beltVector) : pos.offset(beltVector);
+			BlockState replacedState = world.getBlockState(next);
+			BeltTileEntity segmentTE = BeltHelper.getSegmentTE(world, next);
+			KineticTileEntity.switchToBlockState(world, next,
+				state.setValue(BeltBlock.CASING, segmentTE != null && segmentTE.casing != CasingType.NONE));
+			world.setBlock(pos, Blocks.AIR.defaultBlockState(), 3 | BlockFlags.IS_MOVING);
+			world.removeBlockEntity(pos);
+			world.levelEvent(2001, pos, Block.getId(state));
+
+			if (!creative && AllBlocks.BELT.has(replacedState)
+				&& replacedState.getValue(BeltBlock.PART) == BeltPart.PULLEY)
+				player.inventory.placeItemBackInInventory(world, AllBlocks.SHAFT.asStack());
+
+			// Eject overshooting items
+			if (part == BeltPart.END && inventory != null) {
+				List<TransportedItemStack> toEject = new ArrayList<>();
+				for (TransportedItemStack transportedItemStack : inventory.getTransportedItems())
+					if (transportedItemStack.beltPosition > beltLength - 1)
+						toEject.add(transportedItemStack);
+				toEject.forEach(inventory::eject);
+				toEject.forEach(inventory.getTransportedItems()::remove);
+			}
+
+			// Transfer items to new controller
+			if (part == BeltPart.START && segmentTE != null && inventory != null) {
+				controllerTE.inventory = null;
+				segmentTE.inventory = null;
+				segmentTE.setController(next);
+				for (TransportedItemStack transportedItemStack : inventory.getTransportedItems()) {
+					transportedItemStack.beltPosition -= 1;
+					if (transportedItemStack.beltPosition <= 0) {
+						ItemEntity entity = new ItemEntity(world, pos.getX() + .5f, pos.getY() + 11 / 16f,
+							pos.getZ() + .5f, transportedItemStack.stack);
+						entity.setDeltaMovement(Vector3d.ZERO);
+						entity.setDefaultPickUpDelay();
+						entity.hurtMarked = true;
+						world.addFreshEntity(entity);
+					} else
+						segmentTE.getInventory()
+							.addItem(transportedItemStack);
+				}
+			}
+
+			return ActionResultType.SUCCESS;
+		}
+
+		BeltTileEntity segmentTE = BeltHelper.getSegmentTE(world, pos);
+		if (segmentTE == null)
+			return ActionResultType.PASS;
+
+		// Split in half
+		int hitSegment = segmentTE.index;
+		Vector3d centerOf = VecHelper.getCenterOf(hit.getBlockPos());
+		Vector3d subtract = hit.getLocation()
+			.subtract(centerOf);
+		boolean towardPositive = subtract.dot(Vector3d.atLowerCornerOf(beltVector)) > 0;
+		BlockPos next = !towardPositive ? pos.subtract(beltVector) : pos.offset(beltVector);
+
+		if (hitSegment == 0 || hitSegment == 1 && !towardPositive)
+			return ActionResultType.FAIL;
+		if (hitSegment == controllerTE.beltLength - 1 || hitSegment == controllerTE.beltLength - 2 && towardPositive)
+			return ActionResultType.FAIL;
+
+		// Look for shafts
+		if (!creative) {
+			int requiredShafts = 0;
+			if (!segmentTE.hasPulley())
+				requiredShafts++;
+			BlockState other = world.getBlockState(next);
+			if (AllBlocks.BELT.has(other) && other.getValue(BeltBlock.PART) == BeltPart.MIDDLE)
+				requiredShafts++;
+
+			int amountRetrieved = 0;
+			Search: while (true) {
+				for (int i = 0; i < player.inventory.getContainerSize(); ++i) {
+					if (amountRetrieved == requiredShafts)
+						break Search;
+
+					ItemStack itemstack = player.inventory.getItem(i);
+					if (itemstack.isEmpty())
+						continue;
+					int count = itemstack.getCount();
+					if (AllBlocks.SHAFT.isIn(itemstack)) {
+						int taken = Math.min(count, requiredShafts - amountRetrieved);
+						if (taken == count)
+							player.inventory.setItem(i, ItemStack.EMPTY);
+						else
+							itemstack.shrink(taken);
+						amountRetrieved += taken;
+					}
+				}
+
+				player.inventory.placeItemBackInInventory(world, AllBlocks.SHAFT.asStack(amountRetrieved));
+				return ActionResultType.FAIL;
+			}
+		}
+
+		if (!world.isClientSide) {
+			for (BlockPos blockPos : beltChain) {
+				BeltTileEntity belt = BeltHelper.getSegmentTE(world, blockPos);
+				if (belt == null)
+					continue;
+				belt.detachKinetics();
+				belt.invalidateItemHandler();
+				belt.beltLength = 0;
+			}
+
+			BeltInventory inventory = controllerTE.inventory;
+			KineticTileEntity.switchToBlockState(world, pos,
+				state.setValue(BeltBlock.PART, towardPositive ? BeltPart.END : BeltPart.START));
+			KineticTileEntity.switchToBlockState(world, next, world.getBlockState(next)
+				.setValue(BeltBlock.PART, towardPositive ? BeltPart.START : BeltPart.END));
+			world.playSound(null, pos, SoundEvents.WOOL_HIT,
+				player == null ? SoundCategory.BLOCKS : SoundCategory.PLAYERS, 0.5F, 2.3F);
+
+			// Transfer items to new controller
+			BeltTileEntity newController = towardPositive ? BeltHelper.getSegmentTE(world, next) : segmentTE;
+			if (newController != null && inventory != null) {
+				newController.inventory = null;
+				newController.setController(newController.getBlockPos());
+				for (Iterator<TransportedItemStack> iterator = inventory.getTransportedItems()
+					.iterator(); iterator.hasNext();) {
+					TransportedItemStack transportedItemStack = iterator.next();
+					float newPosition = transportedItemStack.beltPosition - hitSegment - (towardPositive ? 1 : 0);
+					if (newPosition <= 0)
+						continue;
+					transportedItemStack.beltPosition = newPosition;
+					iterator.remove();
+					newController.getInventory()
+						.addItem(transportedItemStack);
+				}
+			}
+		}
+
+		return ActionResultType.SUCCESS;
+	}
+
+	public static ActionResultType useConnector(BlockState state, World world, BlockPos pos, PlayerEntity player,
+		Hand handIn, BlockRayTraceResult hit, Feedback feedBack) {
+		BeltTileEntity controllerTE = BeltHelper.getControllerTE(world, pos);
+		if (controllerTE == null)
+			return ActionResultType.PASS;
+
+		int beltLength = controllerTE.beltLength;
+		if (beltLength == BeltConnectorItem.maxLength())
+			return ActionResultType.FAIL;
+
+		BlockPos beltVector = new BlockPos(BeltHelper.getBeltVector(state));
+		BeltPart part = state.getValue(BeltBlock.PART);
+		Direction facing = state.getValue(BeltBlock.HORIZONTAL_FACING);
+		List<BlockPos> beltChain = BeltBlock.getBeltChain(world, controllerTE.getBlockPos());
+		boolean creative = player.isCreative();
+
+		if (!hoveringEnd(state, hit))
+			return ActionResultType.PASS;
+
+		BlockPos next = part == BeltPart.START ? pos.subtract(beltVector) : pos.offset(beltVector);
+		BeltTileEntity mergedController = null;
+		int mergedBeltLength = 0;
+
+		// Merge Belts / Extend at End
+		BlockState nextState = world.getBlockState(next);
+		if (!nextState.getMaterial()
+			.isReplaceable()) {
+			if (!AllBlocks.BELT.has(nextState))
+				return ActionResultType.FAIL;
+			if (!beltStatesCompatible(state, nextState))
+				return ActionResultType.FAIL;
+
+			mergedController = BeltHelper.getControllerTE(world, next);
+			if (mergedController == null)
+				return ActionResultType.FAIL;
+			if (mergedController.beltLength + beltLength > BeltConnectorItem.maxLength())
+				return ActionResultType.FAIL;
+
+			mergedBeltLength = mergedController.beltLength;
+
+			if (!world.isClientSide) {
+				boolean flipBelt = facing != nextState.getValue(BeltBlock.HORIZONTAL_FACING);
+				Optional<DyeColor> color = controllerTE.color;
+				for (BlockPos blockPos : BeltBlock.getBeltChain(world, mergedController.getBlockPos())) {
+					BeltTileEntity belt = BeltHelper.getSegmentTE(world, blockPos);
+					if (belt == null)
+						continue;
+					belt.detachKinetics();
+					belt.invalidateItemHandler();
+					belt.beltLength = 0;
+					belt.color = color;
+					if (flipBelt)
+						world.setBlock(blockPos, flipBelt(world.getBlockState(blockPos)), 3 | BlockFlags.IS_MOVING);
+				}
+
+				// Reverse items
+				if (flipBelt && mergedController.inventory != null) {
+					List<TransportedItemStack> transportedItems = mergedController.inventory.getTransportedItems();
+					for (TransportedItemStack transportedItemStack : transportedItems) {
+						transportedItemStack.beltPosition = mergedBeltLength - transportedItemStack.beltPosition;
+						transportedItemStack.prevBeltPosition =
+							mergedBeltLength - transportedItemStack.prevBeltPosition;
+					}
+				}
+			}
+		}
+
+		if (!world.isClientSide) {
+			for (BlockPos blockPos : beltChain) {
+				BeltTileEntity belt = BeltHelper.getSegmentTE(world, blockPos);
+				if (belt == null)
+					continue;
+				belt.detachKinetics();
+				belt.invalidateItemHandler();
+				belt.beltLength = 0;
+			}
+
+			BeltInventory inventory = controllerTE.inventory;
+			KineticTileEntity.switchToBlockState(world, pos, state.setValue(BeltBlock.PART, BeltPart.MIDDLE));
+
+			if (mergedController == null) {
+				// Attach at end
+				world.setBlock(next, state.setValue(BeltBlock.CASING, false), 3 | BlockFlags.IS_MOVING);
+				BeltTileEntity segmentTE = BeltHelper.getSegmentTE(world, next);
+				if (segmentTE != null)
+					segmentTE.color = controllerTE.color;
+				world.playSound(null, pos, SoundEvents.WOOL_PLACE,
+					player == null ? SoundCategory.BLOCKS : SoundCategory.PLAYERS, 0.5F, 1F);
+
+				// Transfer items to new controller
+				if (part == BeltPart.START && segmentTE != null && inventory != null) {
+					segmentTE.setController(next);
+					for (TransportedItemStack transportedItemStack : inventory.getTransportedItems()) {
+						transportedItemStack.beltPosition += 1;
+						segmentTE.getInventory()
+							.addItem(transportedItemStack);
+					}
+				}
+
+			} else {
+				// Merge with other
+				BeltInventory mergedInventory = mergedController.inventory;
+				world.playSound(null, pos, SoundEvents.WOOL_HIT,
+					player == null ? SoundCategory.BLOCKS : SoundCategory.PLAYERS, 0.5F, 1.3F);
+				BeltTileEntity segmentTE = BeltHelper.getSegmentTE(world, next);
+				KineticTileEntity.switchToBlockState(world, next,
+					state.setValue(BeltBlock.CASING, segmentTE != null && segmentTE.casing != CasingType.NONE)
+						.setValue(BeltBlock.PART, BeltPart.MIDDLE));
+
+				if (!creative)
+					player.inventory.placeItemBackInInventory(world, AllBlocks.SHAFT.asStack(2));
+
+				// Transfer items to other controller
+				BlockPos search = controllerTE.getBlockPos();
+				for (int i = 0; i < 10000; i++) {
+					BlockState blockState = world.getBlockState(search);
+					if (!AllBlocks.BELT.has(blockState))
+						break;
+					if (blockState.getValue(BeltBlock.PART) != BeltPart.START) {
+						search = search.subtract(beltVector);
+						continue;
+					}
+
+					BeltTileEntity newController = BeltHelper.getSegmentTE(world, search);
+
+					if (newController != controllerTE && inventory != null) {
+						newController.setController(search);
+						controllerTE.inventory = null;
+						for (TransportedItemStack transportedItemStack : inventory.getTransportedItems()) {
+							transportedItemStack.beltPosition += mergedBeltLength;
+							newController.getInventory()
+								.addItem(transportedItemStack);
+						}
+					}
+
+					if (newController != mergedController && mergedInventory != null) {
+						newController.setController(search);
+						mergedController.inventory = null;
+						for (TransportedItemStack transportedItemStack : mergedInventory.getTransportedItems()) {
+							if (newController == controllerTE)
+								transportedItemStack.beltPosition += beltLength;
+							newController.getInventory()
+								.addItem(transportedItemStack);
+						}
+					}
+
+					break;
+				}
+			}
+		}
+		return ActionResultType.SUCCESS;
+	}
+
+	static boolean beltStatesCompatible(BlockState state, BlockState nextState) {
+		Direction facing1 = state.getValue(BeltBlock.HORIZONTAL_FACING);
+		BeltSlope slope1 = state.getValue(BeltBlock.SLOPE);
+		Direction facing2 = nextState.getValue(BeltBlock.HORIZONTAL_FACING);
+		BeltSlope slope2 = nextState.getValue(BeltBlock.SLOPE);
+
+		switch (slope1) {
+		case UPWARD:
+			if (slope2 == BeltSlope.DOWNWARD)
+				return facing1 == facing2.getOpposite();
+			return slope2 == slope1 && facing1 == facing2;
+		case DOWNWARD:
+			if (slope2 == BeltSlope.UPWARD)
+				return facing1 == facing2.getOpposite();
+			return slope2 == slope1 && facing1 == facing2;
+		default:
+			return slope2 == slope1 && facing2.getAxis() == facing1.getAxis();
+		}
+	}
+
+	static BlockState flipBelt(BlockState state) {
+		Direction facing = state.getValue(BeltBlock.HORIZONTAL_FACING);
+		BeltSlope slope = state.getValue(BeltBlock.SLOPE);
+		BeltPart part = state.getValue(BeltBlock.PART);
+
+		if (slope == BeltSlope.UPWARD)
+			state = state.setValue(BeltBlock.SLOPE, BeltSlope.DOWNWARD);
+		else if (slope == BeltSlope.DOWNWARD)
+			state = state.setValue(BeltBlock.SLOPE, BeltSlope.UPWARD);
+
+		if (part == BeltPart.END)
+			state = state.setValue(BeltBlock.PART, BeltPart.START);
+		else if (part == BeltPart.START)
+			state = state.setValue(BeltBlock.PART, BeltPart.END);
+
+		return state.setValue(BeltBlock.HORIZONTAL_FACING, facing.getOpposite());
+	}
+
+	static boolean hoveringEnd(BlockState state, BlockRayTraceResult hit) {
+		BeltPart part = state.getValue(BeltBlock.PART);
+		if (part == BeltPart.MIDDLE || part == BeltPart.PULLEY)
+			return false;
+
+		Vector3d beltVector = BeltHelper.getBeltVector(state);
+		Vector3d centerOf = VecHelper.getCenterOf(hit.getBlockPos());
+		Vector3d subtract = hit.getLocation()
+			.subtract(centerOf);
+
+		return subtract.dot(beltVector) > 0 == (part == BeltPart.END);
+	}
+
+	@OnlyIn(Dist.CLIENT)
+	public static void tickHoveringInformation() {
+		Minecraft mc = Minecraft.getInstance();
+		RayTraceResult target = mc.hitResult;
+		if (target == null || !(target instanceof BlockRayTraceResult))
+			return;
+
+		BlockRayTraceResult result = (BlockRayTraceResult) target;
+		ClientWorld world = mc.level;
+		BlockPos pos = result.getBlockPos();
+		BlockState state = world.getBlockState(pos);
+		ItemStack held = mc.player.getItemInHand(Hand.MAIN_HAND);
+		ItemStack heldOffHand = mc.player.getItemInHand(Hand.OFF_HAND);
+
+		if (mc.player.isShiftKeyDown())
+			return;
+		if (!AllBlocks.BELT.has(state))
+			return;
+
+		Feedback feedback = new Feedback();
+
+		// TODO: Populate feedback in the methods for clientside 
+		if (AllItems.WRENCH.isIn(held) || AllItems.WRENCH.isIn(heldOffHand))
+			useWrench(state, world, pos, mc.player, Hand.MAIN_HAND, result, feedback);
+		else if (AllItems.BELT_CONNECTOR.isIn(held) || AllItems.BELT_CONNECTOR.isIn(heldOffHand))
+			useConnector(state, world, pos, mc.player, Hand.MAIN_HAND, result, feedback);
+		else
+			return;
+
+		if (feedback.langKey != null)
+			mc.player.displayClientMessage(Lang.translate(feedback.langKey)
+				.withStyle(feedback.formatting), true);
+		else
+			mc.player.displayClientMessage(new StringTextComponent(""), true);
+
+		if (feedback.bb != null)
+			CreateClient.OUTLINER.chaseAABB("BeltSlicer", feedback.bb)
+				.lineWidth(1 / 16f)
+				.colored(feedback.color);
+	}
+
+}

src/main/java/com/simibubi/create/content/contraptions/relays/belt/BeltTileEntity.java

@@ -223,8 +223,15 @@ public class BeltTileEntity extends KineticTileEntity implements ILightUpdateLis
 			if (!isController())
 				controller = NBTUtil.readBlockPos(compound.getCompound("Controller"));
 			trackerUpdateTag = compound;
-			beltLength = compound.getInt("Length");
 			index = compound.getInt("Index");
+			int length = compound.getInt("Length");
+			if (beltLength != length) {
+				beltLength = length;
+				if (level != null)
+					initializeLight();
+				else
+					light = null;
+			}
 		}
 
 		if (isController())
@@ -516,6 +523,10 @@ public class BeltTileEntity extends KineticTileEntity implements ILightUpdateLis
 			return getController().equals(((BeltTileEntity) target).getController()) ? 1 : 0;
 		return 0;
 	}
+	
+	public void invalidateItemHandler() {
+		itemHandler.invalidate();
+	}
 
 	@Override
 	public boolean shouldRenderNormally() {
@@ -524,7 +535,7 @@ public class BeltTileEntity extends KineticTileEntity implements ILightUpdateLis
 		BlockState state = getBlockState();
 		return state != null && state.hasProperty(BeltBlock.PART) && state.getValue(BeltBlock.PART) == BeltPart.START;
 	}
-
+	
 	@Override
 	public boolean onLightUpdate(IBlockDisplayReader world, LightType type, GridAlignedBB changed) {
 		if (this.remove) {

src/main/java/com/simibubi/create/content/contraptions/relays/belt/item/BeltConnectorItem.java

@@ -15,6 +15,7 @@ import com.simibubi.create.content.contraptions.relays.elementary.AbstractShaftB
 import com.simibubi.create.content.contraptions.relays.elementary.ShaftBlock;
 import com.simibubi.create.foundation.advancement.AllTriggers;
 import com.simibubi.create.foundation.config.AllConfigs;
+import com.simibubi.create.foundation.utility.VecHelper;
 
 import net.minecraft.block.BlockState;
 import net.minecraft.entity.player.PlayerEntity;
@@ -31,6 +32,8 @@ import net.minecraft.util.Direction;
 import net.minecraft.util.Direction.Axis;
 import net.minecraft.util.Direction.AxisDirection;
 import net.minecraft.util.NonNullList;
+import net.minecraft.util.SoundCategory;
+import net.minecraft.util.SoundEvents;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
 
@@ -118,6 +121,8 @@ public class BeltConnectorItem extends BlockItem {
 	}
 
 	public static void createBelts(World world, BlockPos start, BlockPos end) {
+		world.playSound(null, new BlockPos(VecHelper.getCenterOf(start.offset(end))
+			.scale(.5f)), SoundEvents.WOOL_PLACE, SoundCategory.BLOCKS, 0.5F, 1F);
 
 		BeltSlope slope = getSlopeBetween(start, end);
 		Direction facing = getFacingFromTo(start, end);
@@ -152,8 +157,8 @@ public class BeltConnectorItem extends BlockItem {
 		if (diff.getX() == 0 && diff.getZ() == 0)
 			axisDirection = diff.getY() > 0 ? AxisDirection.POSITIVE : AxisDirection.NEGATIVE;
 		else
-			axisDirection = beltAxis.choose(diff.getX(), 0, diff.getZ()) > 0 ? AxisDirection.POSITIVE
-				: AxisDirection.NEGATIVE;
+			axisDirection =
+				beltAxis.choose(diff.getX(), 0, diff.getZ()) > 0 ? AxisDirection.POSITIVE : AxisDirection.NEGATIVE;
 
 		return Direction.get(axisDirection, beltAxis);
 	}
@@ -169,7 +174,8 @@ public class BeltConnectorItem extends BlockItem {
 		return BeltSlope.HORIZONTAL;
 	}
 
-	private static List<BlockPos> getBeltChainBetween(BlockPos start, BlockPos end, BeltSlope slope, Direction direction) {
+	private static List<BlockPos> getBeltChainBetween(BlockPos start, BlockPos end, BeltSlope slope,
+		Direction direction) {
 		List<BlockPos> positions = new LinkedList<>();
 		int limit = 1000;
 		BlockPos current = start;
@@ -249,7 +255,7 @@ public class BeltConnectorItem extends BlockItem {
 
 	}
 
-	protected static Integer maxLength() {
+	public static Integer maxLength() {
 		return AllConfigs.SERVER.kinetics.maxBeltLength.get();
 	}
 

src/main/java/com/simibubi/create/events/ClientEvents.java

@@ -24,6 +24,7 @@ import com.simibubi.create.content.contraptions.components.turntable.TurntableHa
 import com.simibubi.create.content.contraptions.goggles.GoggleOverlayRenderer;
 import com.simibubi.create.content.contraptions.goggles.IHaveGoggleInformation;
 import com.simibubi.create.content.contraptions.itemAssembly.SequencedAssemblyRecipe;
+import com.simibubi.create.content.contraptions.relays.belt.BeltSlicer;
 import com.simibubi.create.content.contraptions.relays.belt.item.BeltConnectorHandler;
 import com.simibubi.create.content.curiosities.armor.CopperBacktankArmorLayer;
 import com.simibubi.create.content.curiosities.tools.BlueprintOverlayRenderer;
@@ -125,6 +126,7 @@ public class ClientEvents {
 		// ScreenOpener.tick();
 		ServerSpeedProvider.clientTick();
 		BeltConnectorHandler.tick();
+		BeltSlicer.tickHoveringInformation();
 		FilteringRenderer.tick();
 		LinkRenderer.tick();
 		ScrollValueRenderer.tick();