Procedural Geometry with Open Shading Language on Pixar’s Onward and Soul
SIGGRAPH Talks(2020)
Abstract
Since Brave, Pixar has used a system called Moss to manage procedural ground cover such as grass and dense debris. The Moss system made it easy for a show to develop a series of looks (or ”types”) implemented in C++ with APIs mimicking a standard shading language. For Onward and Soul, we wanted to make development of types simpler for shading artists less familiar with C++, while still preserving the workflows and performance crucial to our vegetation heavy shows. Inspired partially by the new shading interface in RenderMan’s RIS path tracer, we reimagined Moss as having a small number of core types defining both the structure (debris, particles, single-blade grass, feathered grass, etc.) and features (keep alive, simulation, etc.). Look development and customization of these types would now be handled by Open Shading Language.
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