remove assumption that world starts at Y=0

common/src/main/java/com/dfsek/terra/api/platform/world/World.java

@@ -32,4 +32,6 @@ public interface World extends Handle {
     Block getBlockAt(Location l);
 
     Entity spawnEntity(Location location, EntityType entityType);
+
+    int getMinHeight();
 }

common/src/main/java/com/dfsek/terra/carving/UserDefinedCarver.java

@@ -39,7 +39,7 @@ public class UserDefinedCarver extends Carver {
     private final Expression yRad;
     private final Expression zRad;
 
-    private final Map<World, CarverCache> cacheMap = new ConcurrentHashMap<>();
+    private final Map<Long, CarverCache> cacheMap = new ConcurrentHashMap<>();
     private final TerraPlugin main;
     private double step = 2;
     private Range recalc = new Range(8, 10);
@@ -108,7 +108,7 @@ public class UserDefinedCarver extends Carver {
     @Override
     public void carve(int chunkX, int chunkZ, World w, BiConsumer<Vector3, CarvingType> consumer) {
         synchronized(cacheMap) {
-            CarverCache cache = cacheMap.computeIfAbsent(w, world -> new CarverCache(world, main, this));
+            CarverCache cache = cacheMap.computeIfAbsent(w.getSeed(), world -> new CarverCache(w, main, this));
             int carvingRadius = getCarvingRadius();
             for(int x = chunkX - carvingRadius; x <= chunkX + carvingRadius; x++) {
                 for(int z = chunkZ - carvingRadius; z <= chunkZ + carvingRadius; z++) {

common/src/main/java/com/dfsek/terra/world/generation/generators/DefaultChunkGenerator3D.java

@@ -116,7 +116,7 @@ public class DefaultChunkGenerator3D implements TerraChunkGenerator {
 
                     boolean justSet = false;
                     BlockData data = null;
-                    for(int y = world.getMaxHeight() - 1; y >= 0; y--) {
+                    for(int y = world.getMaxHeight() - 1; y >= world.getMinHeight(); y--) {
                         if(sampler.sample(x, y, z) > 0) {
                             justSet = true;
                             data = PaletteUtil.getPalette(x, y, z, c, sampler).get(paletteLevel, cx, y, cz);

common/src/main/java/com/dfsek/terra/world/generation/math/interpolation/ChunkInterpolator3D.java

@@ -16,9 +16,12 @@ import java.util.function.BiFunction;
  * Contains method to get interpolated noise at a coordinate within the chunk.
  */
 public class ChunkInterpolator3D implements ChunkInterpolator {
-    private final Interpolator3[][][] interpGrid = new Interpolator3[4][64][4];
+    private final Interpolator3[][][] interpGrid;
     private final BiFunction<Generator, Vector3, Double> noiseGetter;
 
+    private final int min;
+    private final int max;
+
     /**
      * Instantiates a 3D ChunkInterpolator3D at a pair of chunk coordinates.
      *
@@ -31,7 +34,15 @@ public class ChunkInterpolator3D implements ChunkInterpolator {
         int xOrigin = chunkX << 4;
         int zOrigin = chunkZ << 4;
 
-        double[][][] noiseStorage = new double[5][5][65];
+        this.max = w.getMaxHeight();
+        this.min = w.getMinHeight();
+        int range = max - min + 1;
+
+        int size = range >> 2;
+
+        interpGrid = new Interpolator3[4][size][4];
+
+        double[][][] noiseStorage = new double[5][5][size + 1];
 
         for(int x = 0; x < 5; x++) {
             for(int z = 0; z < 5; z++) {
@@ -47,7 +58,7 @@ public class ChunkInterpolator3D implements ChunkInterpolator {
                     }
                 }
 
-                for(int y = 0; y < 65; y++) {
+                for(int y = 0; y < size + 1; y++) {
                     noiseStorage[x][z][y] = computeNoise(genMap, (x << 2) + xOrigin, y << 2, (z << 2) + zOrigin);
                 }
             }
@@ -55,7 +66,7 @@ public class ChunkInterpolator3D implements ChunkInterpolator {
 
         for(int x = 0; x < 4; x++) {
             for(int z = 0; z < 4; z++) {
-                for(int y = 0; y < 64; y++) {
+                for(int y = 0; y < size; y++) {
                     interpGrid[x][y][z] = new Interpolator3(
                             noiseStorage[x][z][y],
                             noiseStorage[x + 1][z][y],
@@ -87,6 +98,6 @@ public class ChunkInterpolator3D implements ChunkInterpolator {
      */
     @Override
     public double getNoise(double x, double y, double z) {
-        return interpGrid[reRange(((int) x) / 4, 3)][reRange(((int) y) / 4, 63)][reRange(((int) z) / 4, 3)].trilerp((x % 4) / 4, (y % 4) / 4, (z % 4) / 4);
+        return interpGrid[reRange(((int) x) / 4, 3)][FastMath.max(FastMath.min(((int) y), max), min) / 4][reRange(((int) z) / 4, 3)].trilerp((x % 4) / 4, (y % 4) / 4, (z % 4) / 4);
     }
 }

platforms/bukkit/src/main/java/com/dfsek/terra/bukkit/world/BukkitWorld.java

@@ -77,6 +77,11 @@ public class BukkitWorld implements World {
         return new BukkitEntity(delegate.spawnEntity(BukkitAdapter.adapt(location), ((BukkitEntityType) entityType).getHandle()));
     }
 
+    @Override
+    public int getMinHeight() {
+        return 0;
+    }
+
     @Override
     public org.bukkit.World getHandle() {
         return delegate;

platforms/fabric/src/main/java/com/dfsek/terra/fabric/world/block/state/FabricBlankBlockState.java

@@ -1,50 +0,0 @@
-package com.dfsek.terra.fabric.world.block.state;
-
-import com.dfsek.terra.api.platform.block.Block;
-import com.dfsek.terra.api.platform.block.BlockData;
-import com.dfsek.terra.api.platform.block.state.BlockState;
-import com.dfsek.terra.fabric.world.block.FabricBlock;
-
-public class FabricBlankBlockState implements BlockState {
-    private final FabricBlock delegate;
-
-    public FabricBlankBlockState(FabricBlock delegate) {
-        this.delegate = delegate;
-    }
-
-
-    @Override
-    public Block getHandle() {
-        return delegate;
-    }
-
-    @Override
-    public Block getBlock() {
-        return delegate;
-    }
-
-    @Override
-    public int getX() {
-        return delegate.getX();
-    }
-
-    @Override
-    public int getY() {
-        return delegate.getY();
-    }
-
-    @Override
-    public int getZ() {
-        return delegate.getZ();
-    }
-
-    @Override
-    public BlockData getBlockData() {
-        return delegate.getBlockData();
-    }
-
-    @Override
-    public boolean update(boolean applyPhysics) {
-        return true;
-    }
-}

platforms/fabric/src/main/java/com/dfsek/terra/fabric/world/handles/FabricWorld.java

@@ -93,6 +93,11 @@ public class FabricWorld implements World, FabricWorldHandle {
         return null;
     }
 
+    @Override
+    public int getMinHeight() {
+        return 0;
+    }
+
     @Override
     public Handle getHandle() {
         return null;

platforms/fabric/src/main/java/com/dfsek/terra/fabric/world/handles/world/FabricSeededWorldAccess.java

@@ -80,6 +80,11 @@ public class FabricSeededWorldAccess implements World, FabricWorldHandle {
         return null;
     }
 
+    @Override
+    public int getMinHeight() {
+        return 0;
+    }
+
     @Override
     public int hashCode() {
         return ((ServerWorldAccess) handle.worldAccess).toServerWorld().hashCode();

platforms/fabric/src/main/java/com/dfsek/terra/fabric/world/handles/world/FabricWorldAccess.java

@@ -80,6 +80,11 @@ public class FabricWorldAccess implements World, FabricWorldHandle {
         return null;
     }
 
+    @Override
+    public int getMinHeight() {
+        return 0;
+    }
+
     @Override
     public WorldAccess getHandle() {
         return delegate;

platforms/fabric/src/main/java/com/dfsek/terra/fabric/world/handles/world/FabricWorldChunkRegion.java

@@ -91,6 +91,11 @@ public class FabricWorldChunkRegion implements World, FabricWorldHandle {
         return null;
     }
 
+    @Override
+    public int getMinHeight() {
+        return 0;
+    }
+
     @Override
     public Object getHandle() {
         return delegate;

platforms/region/src/main/java/com/dfsek/terra/platform/DirectWorld.java

@@ -92,6 +92,11 @@ public class DirectWorld implements World {
         return null;
     }
 
+    @Override
+    public int getMinHeight() {
+        return 0;
+    }
+
     @Override
     public Object getHandle() {
         return generator;