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Does "hot"/white pixels refer to fireflies or undefined floating point behavior? The solution to fireflies is radiance clamping or adjusting sampling. Undefined floating point behavior is when a sample somehow ends up as a NaN or Inf (e.g. divided by 0 somewhere) and turns the pixel black/white/something when it's accumulated. |
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Great discussion on the issue of extra hot (white) pixels when rendering: #660
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