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Implementing the example of Walter et al. (2007) paper

Initially and still I'm not so sure how to get the color of the object behind the glass into the formulas. Normal, this was written with path / ray tracers in mind where that part is easy. Your idea ...
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How to calculate the PDF of a multi-lobe BSDF

The summation doesn't include the BxDF that was picked for sampling. Look again at this line: if (bxdfs[i] != bxdf && bxdfs[i]->MatchesFlags(type)) ...
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