Since the article doesn't go into a whole lot of technical detail about the shading technique, here's the pixar whitepaper describing it: https://graphics.pixar

Since the article doesn't go into a whole lot of technical detail about the shading technique, here's the pixar whitepaper describing it: https://graphics.pixar.com/library/BumpRoughness/paper.pdf https://graphics.pixar.com/library/BumpRoughness/paper.pdf