I’ve been using FG for a while and just starting to dabble with GI. I’ve been reading up on it and feel like I’m on the verge of getting Mental Ray to do what I want.
I have a simple scene. When I have a area light, with it’s MR attributes on and photons emitting. I would render the scene with GI only and got a nice layout of photons however whenever I turn final gather on my render turns out black.
The odd part of this to me is that when FG is gathering it’s point it appears like it’s going to render fine and then when the final pass is done everything turns very dark. See images.