There's no reason that a diffuse/spec workflow would be mutually exclusive to PBR. Cryenegine uses a diffuse/spec PBR workflow, and both Unitry 5 and Marmoset Toolbag support both content standards in a PBR workflow. Nope, you can't use it because UE4 doesn't support reading the content. The primary difference between the…
I've actually been using single specs with pretty good results. Just customize color channels for more control over physical properties. Tbh the names aren't very relevant as long as the textures themselves are good enough. Here is a simple example (this does use a detail mask):…