protected HashMap<BlockPos, Node<NodeDataType>> findAllConnectedBlocks(BlockPos startPos) {
    HashMap<BlockPos, Node<NodeDataType>> observedSet = new HashMap<>();
    observedSet.put(startPos, getNodeAt(startPos));
    Node<NodeDataType> firstNode = getNodeAt(startPos);
    MutableBlockPos currentPos = new MutableBlockPos(startPos);
    Stack<EnumFacing> moveStack = new Stack<>();
    main:
    while (true) {
        for (EnumFacing facing : EnumFacing.VALUES) {
            currentPos.move(facing);
            Node<NodeDataType> secondNode = getNodeAt(currentPos);
            //if there is node, and it can connect with previous node, add it to list, and set previous node as current
            if (secondNode != null && canNodesConnect(firstNode, facing, secondNode, this) && !observedSet.containsKey(currentPos)) {
                observedSet.put(currentPos.toImmutable(), getNodeAt(currentPos));
                firstNode = secondNode;
                moveStack.push(facing.getOpposite());
                continue main;
            } else currentPos.move(facing.getOpposite());
        }
        if (!moveStack.isEmpty()) {
            currentPos.move(moveStack.pop());
            firstNode = getNodeAt(currentPos);
        } else break;
    }
    return observedSet;
}
 

private boolean checkMultiblockValid(Map<BlockPos, MetaTileEntityTank> tankMap, BlockPos lowestCorner, int sizeX, int sizeY, int sizeZ) {
    //iterate each block to ensure that we have tanks in valid positions
    HashSet<BlockPos> visitedPositions = new HashSet<>();
    MutableBlockPos blockPos = new MutableBlockPos();
    for (int i = 0; i < sizeX; i++) {
        for (int j = 0; j < sizeY; j++) {
            for (int k = 0; k < sizeZ; k++) {
                blockPos.setPos(lowestCorner.getX() + i, lowestCorner.getY() + j, lowestCorner.getZ() + k);
                MetaTileEntityTank tankHere = tankMap.get(blockPos);
                if (tankHere == null) {
                    //tank is not here, so multiblock is not formed
                    return false;
                }
                //add found tank into the visited position list
                visitedPositions.add(tankHere.getPos());
            }
        }
    }
    //multiblock is assembled only if every tank neighbour is in the multiblock
    return visitedPositions.containsAll(tankMap.keySet());
}
 

@Override
public boolean onBlockActivated(World worldIn, BlockPos pos, IBlockState state, EntityPlayer playerIn, EnumHand hand, EnumFacing facing, float hitX, float hitY, float hitZ) {
    ItemStack stackInHand = playerIn.getHeldItem(hand);
    if (stackInHand.isEmpty() || !(stackInHand.getItem() instanceof FrameItemBlock))
        return false;
    IBlockState blockState = ((FrameItemBlock) stackInHand.getItem()).getBlockState(stackInHand);
    if (blockState != worldIn.getBlockState(pos))
        return false;
    MutableBlockPos blockPos = new MutableBlockPos(pos);
    for (int i = 0; i < 32; i++) {
        IBlockState stateHere = worldIn.getBlockState(blockPos);
        if (stateHere == state) {
            blockPos.move(EnumFacing.UP);
            continue;
        }
        if (canPlaceBlockAt(worldIn, blockPos)) {
            worldIn.setBlockState(blockPos, blockState);
            if (!playerIn.capabilities.isCreativeMode)
                stackInHand.shrink(1);
            return true;
        } else {
            return false;
        }
    }
    return false;
}
 

public boolean checkStructure() {
	MutableBlockPos position = new MutableBlockPos(pos);
	int heighest = 0;
	for (int i = pos.getY() + 1; i < (world.provider.getActualHeight() + 1); i++) {
		position.setY(i);
		if (!checkPos(position)) {
			heighest = i - 1;
			this.casingheight = i;
			fenceCheck();
			this.chance = 262 - (casingheight - (this.getPos().getY() + 1));
			chanceCheck();
			break;
		}
	}
	return heighest > (pos.getY() + 7);
}
 

public ShipCollisionTask(WorldPhysicsCollider toTask, int taskStartIndex) {
    this.taskStartIndex = taskStartIndex;
    this.toTask = toTask;
    this.mutablePos = new MutableBlockPos();
    this.inLocalPos = new MutableBlockPos();
    this.inWorld = new Vector();
    this.collisionInformationGenerated = new ArrayList<>();
    this.inWorldState = null;

    int size = toTask.getCachedPotentialHitSize();
    if (taskStartIndex + MAX_TASKS_TO_CHECK > size + 1) {
        tasksToCheck = size + 1 - taskStartIndex;
    } else {
        tasksToCheck = MAX_TASKS_TO_CHECK;
    }
}
 

public void processCollisionTask(ShipCollisionTask task) {
    MutableBlockPos inWorldPos = new MutableBlockPos();
    MutableBlockPos inLocalPos = new MutableBlockPos();

    Iterator<CollisionInformationHolder> collisionIterator = task
        .getCollisionInformationIterator();

    while (collisionIterator.hasNext()) {
        CollisionInformationHolder info = collisionIterator.next();
        inWorldPos.setPos(info.inWorldX, info.inWorldY, info.inWorldZ);
        inLocalPos.setPos(info.inLocalX, info.inLocalY, info.inLocalZ);
        handleActualCollision(info.collider, inWorldPos, inLocalPos, info.inWorldState,
            info.inLocalState);
    }

    /*
     * for (CollisionInformationHolder info :
     * task.getCollisionInformationGenerated()) { inWorldPos.setPos(info.inWorldX,
     * info.inWorldY, info.inWorldZ); inLocalPos.setPos(info.inLocalX,
     * info.inLocalY, info.inLocalZ); handleActualCollision(info.collider,
     * inWorldPos, inLocalPos, info.inWorldState, info.inLocalState); }
     */

    task.getCollisionInformationGenerated().clear();
}
 

public void physicsTickAfterAllPreForces(float timeStep) {
    List<PhysicsParticle> aliveParticles = new ArrayList<PhysicsParticle>(
        physicsParticles.size());
    MutableBlockPos bufferBlockPos = new MutableBlockPos();
    Vector bufferVector = new Vector();
    Vector bufferVectorForcePos = new Vector();
    Vector bufferVectorForce = new Vector();
    for (PhysicsParticle physicsParticle : physicsParticles) {
        physicsParticle.tickParticle(parent, bufferBlockPos, bufferVector, timeStep);
        if (!physicsParticle.isParticleDead()) {
            aliveParticles.add(physicsParticle);
        } else {
            if (physicsParticle.addMomentumToShip) {
                bufferVectorForcePos
                    .setValue(physicsParticle.posX - parent.getParent().getWrapperEntity().posX,
                        physicsParticle.posY - parent.getParent().getWrapperEntity().posY,
                        physicsParticle.posZ - parent.getParent().getWrapperEntity().posZ);
                bufferVectorForce.setValue(physicsParticle.velX * physicsParticle.mass,
                    physicsParticle.velY * physicsParticle.mass,
                    physicsParticle.velZ * physicsParticle.mass);
                parent.addForceAtPoint(bufferVectorForcePos, bufferVectorForce);
            }
        }
    }
    this.physicsParticles = aliveParticles;
}
 

/**
 * Returns the MutableBlockPos <b>pos</b> with a position set to <b>posReference</b> offset by <b>amount</b> in the direction <b>side</b>.
 */
public static MutableBlockPos getOffsetPosition(MutableBlockPos pos, BlockPos posReference, EnumFacing side, int amount)
{
    switch (side)
    {
        case NORTH:
            pos.setPos(posReference.getX(), posReference.getY(), posReference.getZ() - amount);
        case SOUTH:
            pos.setPos(posReference.getX(), posReference.getY(), posReference.getZ() + amount);
        case EAST:
            pos.setPos(posReference.getX() + amount, posReference.getY(), posReference.getZ());
        case WEST:
            pos.setPos(posReference.getX() - amount, posReference.getY(), posReference.getZ());
        case UP:
            pos.setPos(posReference.getX(), posReference.getY() + amount, posReference.getZ());
        case DOWN:
            pos.setPos(posReference.getX(), posReference.getY() - amount, posReference.getZ());
    }

    return pos;
}
 

@Override
public boolean handleHarvest(IBetterChest chest, IBlockState state, World world, BlockPos pos) {
	MutableBlockPos start = new MutableBlockPos(pos);
	while (canBreak(world, start)) {
		start.move(EnumFacing.UP);
	}
	start.move(EnumFacing.DOWN);

	if (start.getY() >= pos.getY()) {
		BlockPos target = search(world, pos);
		IBlockState targetState = world.getBlockState(target);
		targetState.getBlock().breakBlock(world, pos, state);
		PlantHarvestHelper.breakBlockHandleDrop(world, target, targetState, chest);
		return true;
	}
	return false;
}
 

/** Scan an area for stuff */
public List<BlockPos> scanArea(World world) {
	List<BlockPos> bpl = new ArrayList<BlockPos>();
	Iterable<MutableBlockPos> set = BlockPos.getAllInBoxMutable(startX, startY, startZ, endX, endY, endZ);
	Iterator<MutableBlockPos> in = set.iterator();
	while (in.hasNext()) {
		MutableBlockPos mbp = in.next();
		if (!world.isAirBlock(mbp)) {
			bpl.add(mbp.toImmutable());
		}
	}
	return bpl;
}
 

public boolean populateChunk(World world) {
    MutableBlockPos blockPos = new MutableBlockPos();
    boolean generatedAnything = false;
    for (OreDepositDefinition definition : oreBlocks.keySet()) {
        TLongList blockIndexList = oreBlocks.get(definition);
        TLongSet generatedBlocks = new TLongHashSet();
        boolean generatedOreVein = false;
        for (int i = 0; i < blockIndexList.size(); i++) {
            long blockIndex = blockIndexList.get(i);
            int xyzValue = (int) (blockIndex >> 32);
            int blockX = (byte) xyzValue;
            int blockZ = (byte) (xyzValue >> 8);
            int blockY = (short) (xyzValue >> 16);
            int index = (int) blockIndex;
            blockPos.setPos(chunkX * 16 + blockX, blockY, chunkZ * 16 + blockZ);
            IBlockState currentState = world.getBlockState(blockPos);
            IBlockState newState;
            if (index == 0) {
                //it's primary ore block
                if (!definition.getGenerationPredicate().test(currentState, world, blockPos))
                    continue; //do not generate if predicate didn't match
                newState = definition.getBlockFiller().apply(currentState, world, blockPos, blockX, blockY, blockZ);
            } else {
                //it's populator-generated block with index
                VeinBufferPopulator populator = (VeinBufferPopulator) definition.getVeinPopulator();
                newState = populator.getBlockByIndex(world, blockPos, index - 1);
            }
            //set flags as 16 to avoid observer updates loading neighbour chunks
            world.setBlockState(blockPos, newState, 16);
            generatedBlocks.add(Block.getStateId(newState));
            generatedOreVein = true;
            generatedAnything = true;
        }
        if (generatedOreVein) {
            this.generatedBlocksSet.put(definition, generatedBlocks);
            this.generatedOres.add(definition);
        }
    }
    return generatedAnything;
}
 

@Override
public void generate(Random gridRandom, IBlockGeneratorAccess relativeBlockAccess) {
    MutableBlockPos relativePos = new MutableBlockPos();
    int blocksCount = minBlocksCount == maxBlocksCount ? maxBlocksCount : minBlocksCount + gridRandom.nextInt(maxBlocksCount - minBlocksCount);
    EnumFacing prevDirection = null;
    for (int i = 0; i < blocksCount; i++) {
        EnumFacing[] allowedFacings = ArrayUtils.removeElement(EnumFacing.VALUES, prevDirection);
        prevDirection = allowedFacings[gridRandom.nextInt(allowedFacings.length)];
        relativePos.offset(prevDirection);
        relativeBlockAccess.generateBlock(relativePos.getX(), relativePos.getY(), relativePos.getZ());
    }
}
 

private MutableBlockPos setActualRelativeOffset(MutableBlockPos pos, int x, int y, int z, EnumFacing facing) {
    //if (!ArrayUtils.contains(ALLOWED_FACINGS, facing))
    //    throw new IllegalArgumentException("Can rotate only horizontally");
    int[] c0 = new int[]{x, y, z}, c1 = new int[3];
    for (int i = 0; i < 3; i++) {
        switch (structureDir[i].getActualFacing(facing)) {
            case UP:
                c1[1] = c0[i];
                break;
            case DOWN:
                c1[1] = -c0[i];
                break;
            case WEST:
                c1[0] = -c0[i];
                break;
            case EAST:
                c1[0] = c0[i];
                break;
            case NORTH:
                c1[2] = -c0[i];
                break;
            case SOUTH:
                c1[2] = c0[i];
                break;
        }
    }
    return pos.setPos(c1[0], c1[1], c1[2]);
}
 

public IBlockState getOffsetState(EnumFacing face) {
    if (pos instanceof MutableBlockPos) {
        ((MutableBlockPos) pos).move(face);
        IBlockState blockState = world.getBlockState(pos);
        ((MutableBlockPos) pos).move(face.getOpposite());
        return blockState;
    }
    return world.getBlockState(this.pos.offset(face));
}
 

private static Map<BlockPos, MetaTileEntityTank> findConnectedTanks(MetaTileEntityTank tank, Set<BlockPos> visitedSet) {
    BlockPos startPos = tank.getPos();
    HashMap<BlockPos, MetaTileEntityTank> observedSet = new HashMap<>();
    if (visitedSet.contains(startPos)) {
        return observedSet;
    }
    observedSet.put(tank.getPos(), tank);
    visitedSet.add(startPos);
    MetaTileEntityTank firstNode = observedSet.get(startPos);
    MutableBlockPos currentPos = new MutableBlockPos(startPos);
    Stack<EnumFacing> moveStack = new Stack<>();
    int currentAmount = 0;
    int scanSizeLimit = tank.maxSizeHorizontal * tank.maxSizeHorizontal * tank.maxSizeVertical * 4;
    main: while (true) {
        if (currentAmount >= scanSizeLimit) {
            break;
        }
        for (EnumFacing facing : EnumFacing.VALUES) {
            currentPos.move(facing);
            MetaTileEntityTank metaTileEntity;
            if (!visitedSet.contains(currentPos) &&
                !observedSet.containsKey(currentPos) &&
                (metaTileEntity = tank.getTankTile(currentPos)) != null &&
                canTanksConnect(firstNode, metaTileEntity, facing)) {
                observedSet.put(metaTileEntity.getPos(), metaTileEntity);
                visitedSet.add(metaTileEntity.getPos());
                firstNode = metaTileEntity;
                moveStack.push(facing.getOpposite());
                currentAmount++;
                continue main;
            } else currentPos.move(facing.getOpposite());
        }
        if (!moveStack.isEmpty()) {
            currentPos.move(moveStack.pop());
            firstNode = observedSet.get(currentPos);
        } else break;
    }
    return observedSet;
}
 

private boolean canFrameSupportVertical(World worldIn, BlockPos framePos) {
    MutableBlockPos blockPos = new MutableBlockPos(framePos);
    do {
        blockPos.move(EnumFacing.DOWN);
        IBlockState blockState = worldIn.getBlockState(blockPos);
        if (!(blockState.getBlock() instanceof BlockFrame)) {
            return blockState.getBlockFaceShape(worldIn, blockPos, EnumFacing.UP) == BlockFaceShape.SOLID;
        }
    } while (true);
}
 

public static BlockPos calculateAverageGroundLevel(World worldIn, BlockPos origin, BlockPos sizes) {
    BlockPos dest = origin.add(sizes.getX(), 0, sizes.getZ());
    int minGroundLevel = 256;
    for (MutableBlockPos blockPos : MutableBlockPos.getAllInBoxMutable(origin, dest)) {
        int groundLevel = worldIn.getTopSolidOrLiquidBlock(blockPos).getY();
        minGroundLevel = Math.min(minGroundLevel, groundLevel);
    }
    return new BlockPos(origin.getX(), minGroundLevel, origin.getZ());
}
 

public List<RoutePath> computePatches(BlockPos startPos) {
    ArrayList<RoutePath> readyPaths = new ArrayList<>();
    RoutePath currentPath = new RoutePath();
    Node<WireProperties> firstNode = getNodeAt(startPos);
    currentPath.path.put(startPos, firstNode.data);
    readyPaths.add(currentPath.cloneAndCompute(startPos));
    HashSet<BlockPos> observedSet = new HashSet<>();
    observedSet.add(startPos);
    MutableBlockPos currentPos = new MutableBlockPos(startPos);
    Stack<EnumFacing> moveStack = new Stack<>();
    main:
    while (true) {
        for (EnumFacing facing : EnumFacing.VALUES) {
            currentPos.move(facing);
            Node<WireProperties> secondNode = getNodeAt(currentPos);
            if (secondNode != null && canNodesConnect(firstNode, facing, secondNode, this) && !observedSet.contains(currentPos)) {
                BlockPos immutablePos = currentPos.toImmutable();
                observedSet.add(immutablePos);
                firstNode = secondNode;
                moveStack.push(facing.getOpposite());
                currentPath.path.put(immutablePos, getNodeAt(immutablePos).data);
                if (secondNode.isActive) {
                    //if we are on active node, this is end of our path
                    RoutePath finalizedPath = currentPath.cloneAndCompute(immutablePos);
                    readyPaths.add(finalizedPath);
                }
                continue main;
            } else {
                currentPos.move(facing.getOpposite());
            }
        }
        if (!moveStack.isEmpty()) {
            currentPos.move(moveStack.pop());
            //also remove already visited block from path
            currentPath.path.remove(currentPos);
        } else break;
    }
    return readyPaths;
}
 

private static List<BlockPos> gatherReplacableBlocks(World worldIn, BlockPos centerPos, int maxRadiusSq) {
    HashSet<BlockPos> observedSet = new HashSet<>();
    ArrayList<BlockPos> resultAirBlocks = new ArrayList<>();
    observedSet.add(centerPos);
    resultAirBlocks.add(centerPos);
    Stack<EnumFacing> moveStack = new Stack<>();
    MutableBlockPos currentPos = new MutableBlockPos(centerPos);
    main:
    while (true) {
        for (EnumFacing facing : EnumFacing.VALUES) {
            currentPos.move(facing);
            IBlockState blockStateHere = worldIn.getBlockState(currentPos);
            //if there is node, and it can connect with previous node, add it to list, and set previous node as current
            if (blockStateHere.getBlock().isReplaceable(worldIn, currentPos) &&
                currentPos.distanceSq(centerPos) <= maxRadiusSq && !observedSet.contains(currentPos)) {
                BlockPos immutablePos = currentPos.toImmutable();
                observedSet.add(immutablePos);
                resultAirBlocks.add(immutablePos);
                moveStack.push(facing.getOpposite());
                continue main;
            } else currentPos.move(facing.getOpposite());
        }
        if (!moveStack.isEmpty()) {
            currentPos.move(moveStack.pop());
        } else break;
    }
    resultAirBlocks.sort(Comparator.comparing(it -> it.distanceSq(centerPos)));
    return resultAirBlocks;
}
 

private static List<BlockPos> gatherFrameBlocks(World worldIn, BlockPos centerPos, int maxRadiusSq) {
    HashSet<BlockPos> observedSet = new HashSet<>();
    ArrayList<BlockPos> resultFrameBlocks = new ArrayList<>();
    observedSet.add(centerPos);
    resultFrameBlocks.add(centerPos);
    IBlockState frameState = null;
    Stack<EnumFacing> moveStack = new Stack<>();
    MutableBlockPos currentPos = new MutableBlockPos(centerPos);
    main:
    while (true) {
        for (EnumFacing facing : EnumFacing.VALUES) {
            currentPos.move(facing);
            IBlockState blockStateHere = worldIn.getBlockState(currentPos);
            //if there is node, and it can connect with previous node, add it to list, and set previous node as current
            if (blockStateHere.getBlock() instanceof BlockFrame &&
                currentPos.distanceSq(centerPos) <= maxRadiusSq &&
                (frameState == null || frameState == blockStateHere) && !observedSet.contains(currentPos)) {
                BlockPos immutablePos = currentPos.toImmutable();
                observedSet.add(immutablePos);
                resultFrameBlocks.add(immutablePos);
                moveStack.push(facing.getOpposite());
                frameState = blockStateHere;
                continue main;
            } else currentPos.move(facing.getOpposite());
        }
        if (!moveStack.isEmpty()) {
            currentPos.move(moveStack.pop());
        } else break;
    }
    resultFrameBlocks.sort(Comparator.comparing(it -> it.distanceSq(centerPos)));
    return resultFrameBlocks;
}
 

public static void setPosWithRespectTo(int hash, BlockPos start, MutableBlockPos toSet) {
    int y = hash % maxRange;
    int x = ((hash - y) / maxRange) % maxRange;
    int z = (hash - (x * maxRange) - y) / (maxRangeSquared);
    x -= maxRangeHalved;
    z -= maxRangeHalved;
    toSet.setPos(x + start.getX(), y, z + start.getZ());
}
 

public WorldPhysicsCollider(PhysicsCalculations calculations) {
    this.calculator = calculations;
    this.parent = calculations.getParent();
    this.worldObj = parent.world();
    this.cachedPotentialHits = TCollections.synchronizedList(new TIntArrayList());
    this.cachedHitsToRemove = new TIntArrayList();
    this.rand = new Random();
    this.mutablePos = new MutableBlockPos();
    this.tasks = new ArrayList<ShipCollisionTask>();
    this.ticksSinceCacheUpdate = 25D;
    this.updateCollisionTasksCache = true;
    this.centerPotentialHit = null;
}
 

public void tickParticle(PhysicsCalculations physicsSource, MutableBlockPos bufferBlockPos,
    Vector bufferVector, float timeStep) {
    // First move the particle forward
    this.posX += velX * timeStep;
    this.posY += velY * timeStep;
    this.posZ += velZ * timeStep;
    // Then advance the particle death clock
    this.particleLife -= timeStep;
    this.isParticleDead = (particleLife < 0);
    // Then check for collision in the world
    bufferBlockPos.setPos(posX, posY, posZ);
    if (!canParticlePassThrough(physicsSource.getParent().world(), bufferBlockPos)) {
        // The particle hit a block in the world, so kill it.
        this.isParticleDead = true;
    }
    // If the particle still isn't dead then check for collision in ship
    if (!isParticleDead) {
        bufferVector.setValue(posX, posY, posZ);
        physicsSource.getParent().getShipTransformationManager()
            .getCurrentPhysicsTransform()
            .transform(bufferVector, TransformType.GLOBAL_TO_SUBSPACE);
        bufferBlockPos.setPos(bufferVector.X, bufferVector.Y, bufferVector.Z);
        if (!canParticlePassThrough(physicsSource.getParent().world(), bufferBlockPos)) {
            this.isParticleDead = true;
            addMomentumToShip = true;
        }
    }
}
 

@Override
public boolean placeInExistingPortal(Entity entityIn, float rotationYaw) {
	
	double x, y, z;
	x = entityIn.posX;
	y = entityIn.posY;
	z = entityIn.posZ;
	MutableBlockPos pos = new MutableBlockPos();
	
	for(int yy = (int) y; yy < world.getHeight(); yy++) {
		pos.setPos(x, yy, z);
		if(world.isAirBlock(pos) && world.isAirBlock(pos.add(0,1,0))){
			y = yy;
			break;
		}
	}
       
    if (entityIn instanceof EntityPlayerMP)
    {
        ((EntityPlayerMP)entityIn).connection.setPlayerLocation(x,y,z, entityIn.rotationYaw, entityIn.rotationPitch);
    }
    else
    {
        entityIn.setLocationAndAngles(x,y,z, entityIn.rotationYaw, entityIn.rotationPitch);
    }
    
    return true;
}
 

private Area3D(NBTTagCompound tag)
{
    this.pos = new MutableBlockPos(0, 0, 0);
    this.neg = new MutableBlockPos(0, 0, 0);

    this.readFromNBT(tag);
}
 

private MutableBlockPos clampBounds(MutableBlockPos bounds)
{
    int x = MathHelper.clamp(bounds.getX(), 0, this.maxSize);
    int y = MathHelper.clamp(bounds.getY(), 0, this.maxSize);
    int z = MathHelper.clamp(bounds.getZ(), 0, this.maxSize);

    return bounds.setPos(x, y, z);
}
 

private void setFromPacked(MutableBlockPos bounds, int packed)
{
    int x = MathHelper.clamp((packed >> 16) & 0xFF, 0, this.maxSize);
    int y = MathHelper.clamp((packed >>  8) & 0xFF, 0, this.maxSize);
    int z = MathHelper.clamp(packed         & 0xFF, 0, this.maxSize);

    bounds.setPos(x, y, z);
}
 

@Override
public boolean canHandlePlant(Collection<ItemStack> items, World world, BlockPos pos, IBlockState state) {
	if (!WorldUtil.isBlockAir(world, pos)) {
		return false;
	}
	MutableBlockPos mut = new MutableBlockPos();
	for (EnumFacing facing : EnumFacing.HORIZONTALS) {
		mut.setPos(pos).move(facing);
		IBlockState other = world.getBlockState(mut);
		if (other.getBlock() == Blocks.MELON_STEM || other.getBlock() == Blocks.PUMPKIN_STEM) {
			return  true;
		}
	}
	return false;
}
 

@Override
public boolean handleHarvest(IBetterChest chest, IBlockState state, World world, BlockPos pos) {
	MutableBlockPos mut = new MutableBlockPos(pos);
	while (world.getBlockState(mut).getBlock() == state.getBlock()) {
		mut.move(EnumFacing.UP);
	}
	mut.move(EnumFacing.DOWN);
	if (mut.getY() != pos.getY()) {
		PlantHarvestHelper.breakBlockHandleDrop(world, mut, state, chest);
		return true;
	}
	return false;
}
 

protected boolean canBlockStay(World worldIn, BlockPos pos) {
    MutableBlockPos currentPos = new MutableBlockPos(pos);
    currentPos.move(EnumFacing.DOWN);
    IBlockState downState = worldIn.getBlockState(currentPos);
    if (downState.getBlock() instanceof BlockFrame) {
        if (canFrameSupportVertical(worldIn, currentPos)) {
            return true;
        }
    } else if (downState.getBlockFaceShape(worldIn, currentPos, EnumFacing.UP) == BlockFaceShape.SOLID) {
        return true;
    }
    currentPos.move(EnumFacing.UP);
    HashSet<BlockPos> observedSet = new HashSet<>();
    Stack<EnumFacing> moveStack = new Stack<>();
    main:
    while (true) {
        for (EnumFacing facing : EnumFacing.HORIZONTALS) {
            currentPos.move(facing);
            IBlockState blockStateHere = worldIn.getBlockState(currentPos);
            //if there is node, and it can connect with previous node, add it to list, and set previous node as current
            if (blockStateHere.getBlock() instanceof BlockFrame && currentPos.distanceSq(pos) <= SCAFFOLD_PILLAR_RADIUS_SQ && !observedSet.contains(currentPos)) {
                observedSet.add(currentPos.toImmutable());
                currentPos.move(EnumFacing.DOWN);
                downState = worldIn.getBlockState(currentPos);
                if (downState.getBlock() instanceof BlockFrame) {
                    if (canFrameSupportVertical(worldIn, currentPos)) {
                        return true;
                    }
                } else if (downState.getBlockFaceShape(worldIn, currentPos, EnumFacing.UP) == BlockFaceShape.SOLID) {
                    return true;
                }
                currentPos.move(EnumFacing.UP);
                moveStack.push(facing.getOpposite());
                continue main;
            } else currentPos.move(facing.getOpposite());
        }
        if (!moveStack.isEmpty()) {
            currentPos.move(moveStack.pop());
        } else break;
    }
    return false;
}