Digital Meat shows how you can use metal and rough textures for ultimate flexibility.
There are a couple of PBR workflows for creating shaders and maps. You are either in the metalness camp or the specular/roughness one. Indeed, the apps you work with will dictate which workflow you need.
Sometimes, you may find that you might have to switch between the two, or as Digital Meat’s Samuel Winter shows, how to combine metal and rough maps using Cinema 4D.
The tutorial shows how you can use metal and rough textures authored in another program and combine them to meet your workflow needs using Cinema 4D.