![]() They can ad-hoc subtract energy in order to try to balance the equation but it's not a match to the correct, microflake based form. The most important takeaway is that the distribution of energy between specular and diffuse for any given roughness should use an identical microfacet method and be able to be sampled analytically. Whatever Vray is doing is ad-hoc unless they've already managed to implement such a new thing (and I haven't seen a ton of discussion on it for anything outside research yet). But this is all just food for thought really. Importance Sampling Microfacet BRDFs using VNDF. ^ Appendix B is good, talking about how roughness must be defined in slope space for GGX.ĭesigning Reflectance Models for New Consoles.
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