[1.15.2] Custom WorldType with multiple biomes?

[Stanlyhalo]

Would anyone know how to make a WorldType in 1.15.2, I created one in 1.14.4, but now I want to make it in 1.15.2, and also have multiple biomes. On the side if you could, explain how I would make custom recipes that ONLY work when in the WorldType (optional). Please help, I've been at this for a while trying to make the WorldType work.

[Draco18s]

You can make any biome provider you want to. SingleBiomeProvider is easy because it (a) already exists and (b) requires virtually no configuration.

Replacing it with something else is as simple as "use a different provider" (but you're going to need to specify more details).

[Stanlyhalo]

Well, I have been trying to make a custom provider, which I will continue to make along with stuff to add to configure sizes of biomes hopefully, and also, okay... I do know Java, but alrighty than.

[Draco18s]

You're mostly on your own. There aren't tutorials for this sort of thing as worldgen is very complex.