We mark as pure PBR assets which:

have these material properties

  • use only principled shader in cycles
  • the inputs of the principled shader are texture images or unplugged
  • don't use any procedural textures
  • use UV or Cube mapping.

and their geometry

  • has optimized mesh density
  • only use these modifiers: Subsurf, Edgesplit, Displace

The advantage of pure PBR assets is their convertability into almost any game or render engine.

Pure PBR isn't a limit, and we expect and understand many assets require overstepping these limits (like our mascot kitten).