Specularity is everything

After making maps for roughness and normal reflectance, I am more conscious than ever of its importance. It gives us the needed information to make our brain interpret what kind of surface are we seeing. We can even imagine its touch. Indeed, I think a good specular map is even more important than albedo.

I rescued this model I made a while ago and those are the F0 and roughness maps:

More detailed information about Fresnel Reflectance and Roughness can be found in:

Physically-Based Shading Models in Film and Game Production