[1.15.2] Make trees spawn on custom block

[big papa]

I have a biome, and I made custom trees spawn in it, but they don't spawn on my custom block. How do I make them spawn on it?

[ChampionAsh5357]

You need to make a custom feature for trees as they will always check if there is dirt or farmland beneath them before spawning.

[big papa]

59 minutes ago, ChampionAsh5357 said:

You need to make a custom feature for trees as they will always check if there is dirt or farmland beneath them before spawning.

Do you have any documentation on how to do that?

[ChampionAsh5357]

4 hours ago, big papa said:

Do you have any documentation on how to do that?

Nope, world generation is usually completely undocumented. Just look at the vanilla source for where they put dirt and/or farmland and you'll find what you need to change.

Edited October 17, 2020 by ChampionAsh5357