So I have created a world type that currently spawns my own custom biome and I also found a way to override stone as the block type, and I can set the world to generate and block that I wish. Structures like mineshafts spawn in this world because I have them added in the biome, however caves won't be generated. I think this is because my block isn't set as a carvable type of block which are found in the WorldCarver class. I'm not sure how I would set my Custom block to be carved for caves. 

3 hours ago, HappyPants said:

I also found a way to override stone as the block type

Out if curiosity, how did you do this?

52 minutes ago, Cadiboo said:

Out if curiosity, how did you do this?

I created a new class that extends the OverWorldGenSetttings, and override the function to get the block state. Heres the code my world type where I use my custom Gen Settings that extend OverWorldGenSettings

public class ModWorldType extends WorldType
{

	public ModWorldType() 
	{
		super("modworld_type");
	}

	@Override
	public ChunkGenerator<?> createChunkGenerator(World world) {
			ModGenSettings settings = new ModGenSettings();
			SingleBiomeProviderSettings single = new SingleBiomeProviderSettings(world.getWorldInfo());
			
			return new OverworldChunkGenerator(world, new ModBiomeProvider(), settings);
	}
	
}

 

Here is my Custom Gen Settings Class that extends OverWorldGenSettings. 

public class ModGenSettings extends OverworldGenSettings
{
	   private final int field_202212_j = 4;
	   private final int field_202213_k = 4;
	   private final int field_202214_l = -1;
	   private final int field_202215_m = 63;
	   
	   @Override
	   public BlockState getDefaultBlock() {
	   		return Blocks.BLACK_STAINED_GLASS.getDefaultState();
	   }

	   
	   public int getBiomeSize() {
	      return 4;
	   }

	   public int getRiverSize() {
	      return 4;
	   }

	   public int getBiomeId() {
	      return -1;
	   }

	   public int getBedrockFloorHeight() {
	      return 0;
	   }
}

(My formatting sucks because I've been messing around with a lot of things)

Theres actually a better way to do this, by calling the setDefaultBlock function in GenerationSettings

	@Override
	public ChunkGenerator<?> createChunkGenerator(World world) {
			OverworldGenSettings settings = new OverworldGenSettings();
			
			settings.setDefaultBlock(Blocks.GRANITE.getDefaultState());
			
			return new OverworldChunkGenerator(world, new ModBiomeProvider(), settings) ;
	}

 

I actually figured it out! 

How?