It would have been nice to see even one example scene which would have demonstrated indirect lighting more clearly, something like this one (linked from the article) <a href="https://vimeo.com/214264003" rel="nofollow">https://vimeo.com/214264003</a> where you can nicely see the blue/red tint on the white floor.<p>edit: oh, apparently bounce lights are bit of a kludge here, from github readme:<p>> To bounce light, the previous frame is referenced and emissive surfaces from that frame are added to the current frame. This means every frame, light bounces to one additional surface.