313a7d6236
Fixes: 1. Mixed use of `sample_reflection` and `sample_refraction`. `sample_reflection` is intended for when only reflection is required. For refraction, `sample_vndf` or `sample_refraction` should be used. 2. Wrong weight when accumulating the contribution. Previously `brdf * NV / (fresnel * pdf)` always evaluates to `GL`, but with the new technique of bounded VNDF sampling this is not true anymore. Fixed by adding a field `weight` in the struct `BsdfEval`. 3. Schlick's approximation of the fresnel factor is `F + (1 - F) * (1 - cos(theta))^5`, but BSDF LUT was using `cos^2(theta)`, which was incorrect.
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