Hello! Nice to meet you, and sorry if I’m posting this question in the wrong place. EERussianguy mentioned I should ask you about whether it’s possible to add biomes like those from Alex’s Caves to the world generation of TFC:TNG—perhaps by using a specific event from your mod.

I had a look around, but couldn’t find many ideas on how to add an entire Alex’s Caves-style biome underground during TFC:TNG’s world generation. Could you help me out?

Hi there, as it stands there is no 'proper' way to add biomes to TFC worlds. I would like to support that functionality at some point, but TFC's generator is incompatible with this type of customization.

As for the caves themself, if Alex's Caves uses noise carvers, you should be able to simply add them to TFC's generation via a datapack by overriding the appropriate configured carver and/or density function.

You may also want to look into MoreJS' structureAfterPlace event to fill a region around a structure with a certain biome. Unsure how well it would work, but worth considering if the biomes' functionality cannot be replaced via carvers, noise, and placed/configured features.

Thanks for the answer!! He uses only configured_features, placed_feature, and biome worldgen. I attempted to add the biome/toxic_cave.json to TFC data via a datapack, replacing minecraft:carver* with tfc:carver*, but it did not work. Another idea pls? xD