I’m getting some odd banding on baking a very simple scene with some trees and a simple ground plane. Anyone got any clues? I’ve tried a zillion options and can’t sort it out.
I would guess that this because of the compression on your lightmaps. Either disable “Compress Lightmaps” globaly or per texture or try another compression method with better outcome. Btw try to lower the resolution of the lightmaps afterwards.
In addition to what Epsilon_Delta said, perhaps try changing your Lightmap Encoding setting. It’s in Project Settings > Player > Other Settings > Lightmap Encoding.