9254532b8b
This implements three improvements to the energy preservation and albedo scaling logic, which help the Principled BSDF pass the white-furnace test when using the coat layers at high roughness. Specifically, at roughness 0.3, the albedo scaling brings it from 60% at the edge to 95%, and with the energy preservation it's 99.8%. Pull Request: https://projects.blender.org/blender/blender/pulls/134620
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