Here's a mini-course in materials and optics: The diffuse texture represents the color of the material for the portion of light that reflects "diffusely" (randomly, sort of, in a photon by photon basis). The specular texture represents the color of the material for the portion of light that reflects "straight"... mirror-like. Some materials are entirely diffuse, or at least best modeled as such, such as dirt or cloth.  Represent as colors in diffuse;  black in specular. Some
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