Shading types are handled by a "shader", which offers you variations on how the surface responds to light.
Anisotropic
Creates surfaces with noncircular, "anisotropic" highlights; good for modelling hair, glass, or metal.
Blinn
Creates smooth surfaces with some shininess; a general purpose shader
Metal
Creates a lustrous metallic effect
Multi-Layer
Creates more complex highlights than Anisotropic by layering two anisotropic highlights.
Oren-Nayar-Blinn
Creates good matte surfaces such as fabric or terra-cotta; similar to blinn
Phong
Creates smooth surfaces with some shininess; similar to Blinn, but doesnt handle highlights (especially glancing highlights) as well.
Strauss
Creates both nonmetallic and metallic surfaces; has a simple set of controls.
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