Metalness isn’t black and whitehttps://twitter.com/GenericBologna/status/1342284017941557249 …
-
Genuinely curious to know in what scenario it wouldn’t be black or white? (As a student, I’ve been taught the ‘PBR purist’ way that metal is always 1 or 0 and no in-between).
It's a tricky one because it's an optimisation and we don't blend the BxDF like the Disney PBR model. Generally I'd say impurities like rust and dirt, but no mid values for the base material - whatever avoids artifacts though 
