What set the RenderMan Interface Specification apart from other standards of the time was the specification of a Shading Language (SL), which allowed material descriptions of surfaces to be described not only by adjusting a small set of parameters, but in an arbitrarily complex fashion by using a C-like programming language to write shading procedures commonly known as procedural textures and shaders. PRMan is used internally at Pixar and also licensed to third parties as the RenderMan Pro Serverâ„¢ software package. PRMan is chiefly a Reyes algorithm implementation, although recent versions also include ray tracing features.
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