Just posting in case it's useful: I have been looking at a procedural PBR texture program: https://www.materialmaker.org/   (this has a database of premade pbr's that you can load in and alter, if you wish) Screenshot of a premade pbr stoneground in-game: It is multiplatform (Mac, Linux, Win) . exports to normal, height, albedo, etc. (png format), but I don't see a way to make a specular map. With it you can also load in an existing texture and then create the normalmap of