Stephen Agyemang

Path guiding (Google Summer of Code Project)

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This PR will be continuously updated and should not be merged at this point. Here is the current state of the implementation of "Practical Path Guiding" [Müller et.al. 2017]. The...

Plastic BRDF brightness differences in sample and evaluate methods

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Last year I discovered that the spectrum values returned from the plastic brdf are different in the `sample` and the `evaluate` methdos for the same direction. This can be seen...

Split from PR #2656 (with added variance estimation fix) to keep reviews small. Contains the added VarianceTrackingShadingResultFramebuffer and matching factory, which keep track of the sum of squared samples to...