--- ../src-base/minecraft/net/minecraft/world/WorldType.java
+++ ../src-work/minecraft/net/minecraft/world/WorldType.java
@@ -113,4 +114,145 @@
         this.field_151361_l = true;
         return this;
     }
+
+    public int getMinimumSpawnHeight(World world)
+    {
+        return this == field_77138_c ? 4 : world.func_181545_F() + 1;
+    }
+
+    public double voidFadeMagnitude()
+    {
+        return this == field_77138_c ? 1.0D : 0.03125D;
+    }
+
+    /*=================================================== FORGE START ======================================*/
+
+    /**
+     * Gets the spawn fuzz for players who join the world.
+     * Useful for void world types.
+     * @return Fuzz for entity initial spawn in blocks.
+     */
+    public int getSpawnFuzz(WorldServer world, net.minecraft.server.MinecraftServer server)
+    {
+        return Math.max(0, server.func_184108_a(world));
+    }
+
+    /**
+     * Creates the GenLayerBiome used for generating the world with the specified ChunkProviderSettings JSON String
+     * *IF AND ONLY IF* this WorldType == WorldType.CUSTOMIZED.
+     *
+     *
+     * @param worldSeed The world seed
+     * @param parentLayer The parent layer to feed into any layer you return
+     * @param chunkSettings The ChunkGeneratorSettings constructed from the custom JSON
+     * @return A GenLayer that will return ints representing the Biomes to be generated, see GenLayerBiome
+     */
+    public net.minecraft.world.gen.layer.GenLayer getBiomeLayer(long worldSeed, net.minecraft.world.gen.layer.GenLayer parentLayer, net.minecraft.world.gen.ChunkGeneratorSettings chunkSettings)
+    {
+        net.minecraft.world.gen.layer.GenLayer ret = new net.minecraft.world.gen.layer.GenLayerBiome(200L, parentLayer, this, chunkSettings);
+        ret = net.minecraft.world.gen.layer.GenLayerZoom.func_75915_a(1000L, ret, 2);
+        ret = new net.minecraft.world.gen.layer.GenLayerBiomeEdge(1000L, ret);
+        return ret;
+    }
 }