While it's true that impurities exist in most metals which would give some diffuse properties, the impurities in the metal lead to such low BRDF values that they may as well be black anyway, that's the impression i've gotten from the disney BRDF software anyway. The other thing to consider is that PBR is supposed to make…
I wanted to drop in and mention that the skin shader makes hair come alive! After reading a siggraph presentation from Disney on their hair renderer I found out that their hair shader makes heavy use of translucency. (Makes sense but I've never studied hair shading before, mostly hard surface materials.) So I tried this…