I’ve never used Vray, so I don’t really understand how it does that edge rust, but it wouldn’t be so simple in UE4. I’m not familiar with any edge-detection material functions that could give you anything near what is in your example, but using a simple texture map provided by Quixel’s dDo would be fairly straightforward. The problem with that is the need to have a specific texture map for each object. If you want your textures to be universal and not need to customize them to each object, then I don’t know of a way to get detailed edge-wear like that picture. If an advanced user knows how to do it, feel free to correct me. I would love to know this too.