18 minutes ago, meganoth said:
Where can you do that ?
Mod? Are you talking about Nitrogen?
In rwgmixer.xml. I use the very old code (similar the one that was in A16) - it still works.
And what you described - was in A17 (static map of biomes).
Of course mod, he did it based on the capabilities of the game itself. No third-party utilities and integrations are used.
Just take a look at the screenshots i made there.