Color artifacts when porting Bilateral Grid module to 3D Gaussian Splatting

[lipsmith0701]

I am porting the Nerfstudio Bilateral Grid module to 3D Gaussian Splatting (3D GS). The implementation is consistent with Nerfstudio, except that my output channels are [H, W, 3] instead of Nerfstudio’s [3, H, W]. I adjusted the output channels to match Nerfstudio’s format.

However, my rendered results show white regions with additional color artifacts (such as pink and purple), whereas Nerfstudio’s Splatfacto renderings produce pure white in the same areas.

What could be the most likely cause of these artifacts?