take note of that, the problem of the second one is that is much more noisy and less defined, but might work. Trying to bake amb occlusion on vertex right now
I solved the issue by defining two MImages, one to read from, one to write to. Before, I was simply using the same stream, and it was causing the issue :|
I finished with defining planes, but I'm still not sure about the circled part, I'm confused about the light falloff and how it should affect the area...