Material Shaders and Photon Shaders for Caustics

mental ray comes with three material shaders that support caustics (and global illumination) soft_material, dgs_material and dielectric_material. Their photon shader equivalents are soft_material_photon, dgs_material_photon and dielectric_material_photon. When defining a material it is necessary to specify both the regular material shader and the photon shader. Most often, however, the photon shader can inherit the parameter setting from the regular material shader. In addition to these six shaders, users can write new material and photon material shaders.

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