Shader Family: Photon Material
This shader is used for photon tracing of objects that have the dgs_material shader applied. It has the same parameters as the dgs_material shader.
Caustics and global illumination are computed by photon tracing. Each object needs a photon material shader for photon tracing. A photon shader will usually have the same name as the corresponding material shader, but with "_photon" appended. When using one of these photon shaders in a material that uses the corresponding material shader, omitting all photon shader parameters causes mental ray to pass the material shader parameters to the photon shader. This avoids having to specify all parameters twice.
