Are there any plans for zbrush to support exporting per materials like roughness/metallic maps or specular/glossiness?
It would be great if multi-map exporter could support exporting for specific pbr shading models like Disney’s BRDF…
That would go well above and beyond zbrush’s current material system. The only way it would happen would be if Zbrush 5 gets a radical overhaul in that department, and details on 5 are all but non-existent at the moment.
At the moment you could try working with flat color masks and have a program like Ddo or Substance Designer swap them out with PBR material presets.