[1.11.2] Biome Gen

[LogicTechCorp]

Hello, I have a few question about biome generation. First off can anyone help me understand how to only allow certain biomes to spawn next to each other. For example, hot by warm, warm by cool, and cool by cold. I know Vanilla does this but I do not understand it. Second, how do sub-biomes work? Thank you, all help is appreciated.

 

Here is my current biome gen system:

 

Registry

https://github.com/LogicTechCorp/NetherEx/blob/71dc6f68dcdca6905617e189956b621a23d9ea0c/src/main/java/nex/init/NetherExBiomes.java

 

GenLayers

https://github.com/LogicTechCorp/NetherEx/blob/71dc6f68dcdca6905617e189956b621a23d9ea0c/src/main/java/nex/world/gen/layer/GenLayerAddBiomes.java

https://github.com/LogicTechCorp/NetherEx/blob/71dc6f68dcdca6905617e189956b621a23d9ea0c/src/main/java/nex/world/gen/layer/GenLayerNether.java

[LogicTechCorp]

Can anyone help or point me in the right direction?