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Haha, I was the one that filed the issue. In my implementation I keep the correction term since I do not like the idea of turning a consistent method into an inconsistent one. If I recall correctly, Jakob said that (in Mitsuba renderer) a better importance sampling technique is needed for the term. ...

After thinking for a while, I think you are right. Partially filling the FGD table with FGD_inf is actually a good point, and I think the author meant that way. I am planning on implement this technique too. We can discuss about the details if there is any problem during implementation.

Laurent Belcour's recent paper on layered material looks amazing, here is the link https://belcour.github.io/blog/research/2018/05/05/brdf-realtime-layered.html . But I have got many questions regarding some formulae listed in the paper, especially equation 32 & 33. I think they are both missing the...

Thanks for your suggestion! But I'm not sure if it is okay to multi-post on several places since I already have posted a GitHub issue on PBRT-v3's repository. Actually I'm more confused than before after digging into this problem further. It looks like non of PBRT-v3, LuxRender, Mitsuba, Tungsten ar...

Recently I'm implementing path tracing with next event estimation and encounters a nasty bug: refracted radiance is higher than my path traced reference. Then I discovered that the paper by Walter et al. (Microfacet Models for Refraction through Rough Surfaces) writes the microfacet BTDF formula wit...

After a bad refactor of my simple path tracer