• Ambient color appears where the surface is lit by ambient light alone (where the surface is in shadow).
  • Diffuse color appears where light falls directly on the surface. It is called "diffuse" because light striking it is reflected in various directions. Highlights, on the other hand, are reflections of light sources.
  • Specular highlights appear where the viewing angle is equal to the angle of incidence. Glancing highlights appear where the angle of incidence is high, relative to the observer or camera (that is, the light ray is nearly parallel to the surface). Shiny surfaces usually have specular highlights. Glancing highlights are characteristic of metallic surfaces.

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