Luoshuang's GPULightmass

[Luoshuang]

@Norman3D

I think I’m getting closer to the problem. The GPU calculation gets stuck, the GPU stops working, but Lightmass.exe sits at 62% CPU usage. This only happens when I’m using “Sparse Volume Lighting Samples”. Are these supported?

Sparse Volume Lighting Samples are computed entirely on CPU now. I believe it should be the problem.