NVIDIA GameWorks Integration

Color mixing should work fine, all the math in VXGI is additive in RGB space - and that is physically correct. Unless some saturation in the emittance map is involved, that is.

The page that you reference talks about color mixing in a different color space, like paint on paper. In RGB space, blue (0000ff) + yellow (ffff00) is white (ffffff) - and that’s what you get on that picture, multiplied by some small factor that makes output gray.