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ReflectionUtility is a custom Mental Ray shader that computes smooth, customizable, blurred raytrace reflections. It works by supersampling reflection rays and does oversample the whole scene as the DGS shader does. It is a much faster and more controllable solution in most situations, as you can define a fixed amount of samples per material. It has some other useful reflection related features: anisotropy, Fresnel effect, saturation and color modification, bump mapping that effects only the reflections to create distortions.
Anisotropic effect works with polygonal geometry. (Of course you need proper UV coordinates.) The shader has no new atributes, and it works ok with old scene files.
Update: This is just a simple include file update, to make the shader work with Maya 6. There is no code change, you can simply overwrite the old include files with the new ones.