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Roughness Noise Optimization#

Roughness Noise Optimization is a technique which propagates the roughness of materials along paths. While this technique is not physically correct, it is very effective to remove noise due to inter-reflections since it blurs reflections.

By default, Roughness Noise Optimization is set to 25%. This value offers a good balance between realism and noise reduction. Increasing this value reduces noise at the loss of realism.

In the renders (128 spp) below we can see the effect of Roughness Noise Optimization over the noise.

Roughness Noise Optimization 0%

Roughness Noise Optimization 25%

Roughness Noise Optimization 100%