1b392ef016
The Kuwahara node produces NaNs if the pixels have a very high local standard deviation and sharpness is also high. This is because the weighted sum of the Kuwahara sectors can have a zero total weight, which causes zero division. To fix this, we return the original color if the total weight is zero. Pull Request: https://projects.blender.org/blender/blender/pulls/128378
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