The name RenderMan can cause confusion because it has been used to refer to different things developed by Pixar:

• RenderMan Interface Specification (RISpec), Pixar's technical specification for a standard communications protocol (or interface) between 3D computer graphics programs and rendering programs
• RenderMan Shading Language
• PhotoRealistic RenderMan (PRMan), a RenderMan Interface Specification-compliant rendering software system developed by Pixar based on their own interface specification
• RenderMan, also commonly used to refer to other renderers because of their compliance with the RenderMan standard

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