Papers by David Ryu


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Stochastic Simplification of Aggregate Detail

Robert L. Cook, John Halstead, Maxwell Planck, David Ryu
May 2007

Many renderers perform poorly on scenes that contain a lot of detailed geometry. The load on the renderer can be alleviated by simplification techniques, which create less expensive representations of geometry that is small on the screen. Current simplification techniques for high-quality surface-based rendering tend to work best with element ... more

Additional materials: [SiggraphSlides.pdf], [WithAndWithoutSimplification.mov]

Available in the Proceedings of Siggraph 2007.

Available as Pixar Technical Memo #06-05a

Other versions:


Rivers of Rodents: An Animation-Centric Crowds Pipeline for Ratatouille

David Ryu, Paul Kanyuk
May 2007

One of the major technical challenges in the animated film Ratatouille was creating a believable rat colony. In numbers as high as a thousand, these rats participated in highly complex and coordinated behaviors ranging from chaotic swarming to gourmet cooking. Often, the colony was ... more

Available as Pixar Technical Memo #07-02


500 Million and Counting: Hair Rendering on Ratatouille

David Ryu
May 2007

Featuring plush rats, well-groomed humans, and a colony of rodents numbering a thousand strong, Ratatouille had shots where the original scene descriptions contained many hundreds of millions of hairs. To make these shots renderable, we developed many new technologies to optimize our RenderMan-based hair rendering pipeline, including caching to speed up runtime sculpting, a technique ... more

Available as Pixar Technical Memo #07-09