fluid distribution and render fixes

src/main/java/com/simibubi/create/content/contraptions/fluids/FluidPipeBlock.java

@@ -10,8 +10,10 @@ import net.minecraft.util.Direction;
 import net.minecraft.util.Direction.Axis;
 import net.minecraft.util.Direction.AxisDirection;
 import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.IBlockReader;
 import net.minecraft.world.ILightReader;
 import net.minecraft.world.IWorld;
+import net.minecraftforge.fluids.capability.CapabilityFluidHandler;
 
 import javax.annotation.Nullable;
 
@@ -25,13 +27,13 @@ public class FluidPipeBlock extends SixWayBlock {
         return state.getBlock() instanceof FluidPipeBlock;
     }
 
-    public static boolean isTank(BlockState state) {
+    public static boolean isTank(BlockState state, IBlockReader world, BlockPos pos, Direction blockFace) {
-        return state.getBlock() instanceof FluidTankBlock;
+        return state.hasTileEntity() && world.getTileEntity(pos).getCapability(CapabilityFluidHandler.FLUID_HANDLER_CAPABILITY, blockFace.getOpposite()) != null;
     }
 
     // TODO: more generic pipe connection handling. Ideally without marker interface
     public static boolean canConnectTo(ILightReader world, BlockPos pos, BlockState neighbour, Direction blockFace) {
-        if (isPipe(neighbour) || isTank(neighbour))
+        if (isPipe(neighbour) || isTank(neighbour, world, pos, blockFace))
             return true;
         return neighbour.getBlock() instanceof PumpBlock && blockFace.getAxis() == neighbour.get(PumpBlock.FACING)
                 .getAxis();

src/main/java/com/simibubi/create/content/contraptions/fluids/FluidTankRenderer.java

@@ -168,7 +168,8 @@ public class FluidTankRenderer extends SafeTileEntityRenderer<FluidTankTileEntit
         float percent = (float) tank.getFluidAmount() / (float) tank.getCapacity();
 
         double tankHeight = tankBounds.maxY - tankBounds.minY;
-        double y1 = tankBounds.minY, y2 = (tankBounds.minY + (tankHeight * percent));
+        double y1 = tankBounds.minY;
+        double y2 = tank.getFluidAmount() < tank.getCapacity() ? (3 / 16f + (10 / 16f * percent)) : tankBounds.maxY;
         if (tank.getFluid().getFluid().getAttributes().isLighterThanAir()) {
             double yOff = tankBounds.maxY - y2;  // lighter than air fluids move to the top of the tank
             y1 += yOff;
@@ -178,9 +179,10 @@ public class FluidTankRenderer extends SafeTileEntityRenderer<FluidTankTileEntit
     }
 
     private Collection<TankRenderInfo> getTanksToRender(FluidTankTileEntity te) {
-        boolean up = te.getBlockState().get(FluidTankBlock.TOP);
+        FluidTankTileEntity upTE = te.getOtherFluidTankTileEntity(Direction.UP);
-        boolean down = te.getBlockState().get(FluidTankBlock.BOTTOM);
+        FluidTankTileEntity downTE = te.getOtherFluidTankTileEntity(Direction.DOWN);
-        // bounds.shrink(16f);
+        boolean up = upTE == null || upTE.getTank().getFluidAmount() == 0 || te.getTank().getFluid() != upTE.getTank().getFluid();
+        boolean down = downTE == null || downTE.getTank().getFluidAmount() == downTE.getTank().getCapacity() || te.getTank().getFluid() != downTE.getTank().getFluid();
         return Collections.singletonList(new FluidTankRenderInfo(te.getTank(), up, down, ((FluidTankBlock) te.getBlockState().getBlock()).getTankBodyShape(te.getWorld(), te.getPos())));
     }
 

src/main/java/com/simibubi/create/content/contraptions/fluids/FluidTankTileEntity.java

@@ -1,20 +1,24 @@
 package com.simibubi.create.content.contraptions.fluids;
 
+import java.util.List;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
 import com.simibubi.create.foundation.tileEntity.SmartTileEntity;
 import com.simibubi.create.foundation.tileEntity.TileEntityBehaviour;
+
 import net.minecraft.nbt.CompoundNBT;
+import net.minecraft.tileentity.TileEntity;
 import net.minecraft.tileentity.TileEntityType;
 import net.minecraft.util.Direction;
 import net.minecraftforge.common.capabilities.Capability;
 import net.minecraftforge.common.util.LazyOptional;
 import net.minecraftforge.fluids.IFluidTank;
 import net.minecraftforge.fluids.capability.CapabilityFluidHandler;
+import net.minecraftforge.fluids.capability.IFluidHandler.FluidAction;
 import net.minecraftforge.fluids.capability.templates.FluidTank;
 
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-import java.util.List;
-
 public class FluidTankTileEntity extends SmartTileEntity {
 
     LazyOptional<FluidTank> fluid = LazyOptional.of(this::createFluidHandler);
@@ -23,6 +27,51 @@ public class FluidTankTileEntity extends SmartTileEntity {
         super(tileEntityTypeIn);
     }
 
+    @Override
+    public void tick() {
+        super.tick();
+
+
+        FluidTankTileEntity other;
+
+        other = getOtherFluidTankTileEntity(Direction.NORTH);
+        if (other != null && other.getTank().isFluidValid(this.getTank().getFluid())) {
+            int delta = other.getTank().getFluidAmount() - this.getTank().getFluidAmount();
+            if (delta > 0) {
+                this.getTank().fill(other.getTank().drain(delta / 2, FluidAction.EXECUTE), FluidAction.EXECUTE);
+            } else if (delta < 0) {
+                other.getTank().fill(this.getTank().drain(-delta / 2, FluidAction.EXECUTE), FluidAction.EXECUTE);
+            }
+        }
+
+
+        other = getOtherFluidTankTileEntity(Direction.WEST);
+        if (other != null && other.getTank().isFluidValid(this.getTank().getFluid())) {
+            int delta = other.getTank().getFluidAmount() - this.getTank().getFluidAmount();
+            if (delta > 0) {
+                this.getTank().fill(other.getTank().drain(delta / 2, FluidAction.EXECUTE), FluidAction.EXECUTE);
+            } else if (delta < 0) {
+                other.getTank().fill(this.getTank().drain(-delta / 2, FluidAction.EXECUTE), FluidAction.EXECUTE);
+            }
+        }
+
+        other = getOtherFluidTankTileEntity(Direction.UP);
+        if (other != null && other.getTank().isFluidValid(this.getTank().getFluid())) {
+            int space = this.getTank().getCapacity() - this.getTank().getFluidAmount();
+            if (space > 0 && other.getTank().getFluidAmount() > 0) {
+                this.getTank().fill(other.getTank().drain(space, FluidAction.EXECUTE), FluidAction.EXECUTE);
+            }
+        }
+    }
+
+    @Nullable
+    public FluidTankTileEntity getOtherFluidTankTileEntity(Direction direction) {
+        TileEntity otherTE = world.getTileEntity(pos.offset(direction));
+        if (otherTE instanceof FluidTankTileEntity)
+            return (FluidTankTileEntity) otherTE;
+        return null;
+    }
+
     @Nonnull
     @Override
     public <T> LazyOptional<T> getCapability(@Nonnull Capability<T> cap, @Nullable Direction side) {
@@ -50,7 +99,7 @@ public class FluidTankTileEntity extends SmartTileEntity {
 
     @Nonnull
     public FluidTank createFluidHandler() {
-        return new FluidTank(16);
+        return new FluidTank(16000);
     }
 
     public IFluidTank getTank() {