Multiscattering BRDF
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MilchRatchet commented
The paper Multiple-scattering microfacet BSDFs with the Smith model by Heitz et al presents a microfacet BSDF that is actually fully energy conserving. While I just recently worked on BRDFs, a proper implementation of this should hopefully finally settle this issue. They even provided an example implementation.
MilchRatchet commented
The model by Fdez-Aguera turned out to be more viable. As of fc694c5, the BRDF is fully energy conserving for generic conductors and dielectrics, however, it is not for any metallic values between 0 and 1.