@somedoggy , sorry if I sounded blasé or nonchalant about how things are 'hacked'. In fact, quite the opposite. My reference to UE4's progression was a nod to the incredible work done daily by the tech artists who push the tools and methods to an astounding level. I think the PBR real-time implementation is perhaps the…
If you're using Vray then you don't have to concern yourself with the metal/rough workflow. If creating your textures in a metal/rough environment like substance then you can use the Vray export preset which will convert your maps for use in Vray: diffuse/reflection/glossiness/etc. the roughness channel in Vray is to map…