Luoshuang's GPULightmass

[Luoshuang]

@Muchasty

After some changes ( material One-Sided, replaced point light lines by spots ) Image look better, but still have some “sparks” mostly visible on the ceiling ( but is everywhere - mostly on walls )

I believe this is more or less a bug in GPULightmass’s adaptive sampler. Would you like to send me your scene (or a simplified version) for debugging?

@Rawalanche

Most of modern path tracers use ray clamping (max sample intensity/max ray intensity) values to prevent fireflies. I am wondering of this GPULightmass uses it as well. If not, then that’s what could be attributed to those blurred fireflies. It definitely should be used.

Ray clamping is most useful when handling glossy/specular and other ‘spiky’ BRDFs. For lightmap baking the scene is pure Lambertian diffuse so it is currently not used. Still, I would try it to see its effectiveness :).