8a735d0aa4
* Using standard NDF and Smith shadowing-masking terms. The previous `xxxx_opti()` functions were faster to evaluate, but confusing and error-prone. * After correcting the BRDF pdf, the prefiltered environment LOD bias needs to be adjusted to avoid overblurred reflections. * Corrected the half-vector computation in BTDF evaluation, added check for invalid configuration due to total internal reflection or `eta == 1`. * Use `saturate()` instead of `max()` when no division is needed because the former is faster. * Indirectly fixes EEVEE-Next refraction denoising. Pull Request: https://projects.blender.org/blender/blender/pulls/111591
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