Hi there, I was curious how I would go about making a custom cave. I basically want to change stone into four different blocks. It is annoying because from what I see it generates the caves by removing stone, rather than adding air. Any ideas?

could you not change the stone after the caves are generated ?

 

That could work, but after the cave is generated would the ores that are supposed to only spawn in the cave still generate?

 

No, the ores wouldnt generate because they use the vanilla WorldGenMinable and that removes the stone and places the ore. But what you can do is generate the ores yourself using WorldGenMinable(Spawn, amount, Replace)??