Brilliant, though the metalness maps seem more like low-threshold specular maps (you can see metallic spot readings on the strictly dielectric material [bakelit

Brilliant, though the metalness maps seem more like low-threshold specular maps (you can see metallic spot readings on the strictly dielectric material [bakelite?] on that handle).† The way to correctly detect metalness would also involve checking for coloration of the reflected light (which is not present with specular dielectric materials [but may be confused with subsurface scatter coloration]). Update: † Looks like he knows this, and just hasn't gotten around to implementing it yet.