I noticed that some of the materials look different in one render than another. Why?
We’ve done our best to make these materials match going from one engine to another, but at the end of the day, they all approach shading in different ways. The reality is, a certain phenomenon is just not possible in some renderers. That being said, these materials are meant to be a starting point for your shading work. Artists are encouraged to manipulate and change the material to suit their needs.