The Renderman standard was first presented at 1993 SIGGRAPH, developed with input from 19 companies and 6 or 7 big partners, with Pat Hanrahan taking a leading role. In the past RenderMan used the Reyes Rendering Architecture. This specification facilitates communication between 3D modeling and animation applications and the render engine that generates the final high quality images. RenderMan defines cameras, geometry, materials, and lights using the RenderMan Interface Specification. During that time the Sony Walkman was very popular and Jeff Mock called his portable board Renderman, leading to the software name. The name comes from the nickname of a small circuit board (2.5 × 5 inches or 6.4 × 13 cm) containing one Transputer that engineer Jeff Mock could put in his pocket. To speed up rendering, Pixar engineers performed experiments with parallel rendering computers using Transputer chips inside a Pixar Image Computer.
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