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Subdivision Surfaces in Character Animation

SIGGRAPHPixar720 cites9 descendantsRigging Skinning

Introduced subdivision surfaces into Pixar's production pipeline for Geri's Game, enabling smooth deformable character meshes from arbitrary topology.

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Abstract

This paper describes the use of subdivision surfaces in character animation production, specifically Catmull-Clark surfaces adapted for high-end CG production. The authors develop techniques for semi-sharp creases with variable sharpness, methods for cloth simulation including collision detection, and approaches for defining smooth scalar fields on subdivision surfaces for procedural shading.

How to read this

Category: Method / production technique: subdivision surfaces for character meshes
Contributions: Brings Catmull-Clark subdivision surfaces into high-end character-animation production for smooth deformable meshes from arbitrary topology
Semi-sharp creases with variable sharpness
Cloth simulation with collision detection and smooth scalar fields on subdivision surfaces for procedural shading
Context: Extends classical Catmull-Clark subdivision into a production pipeline (the Geri's Game work), bridging subdivision-surface theory and practical character modeling.Builds on: Recursively Generated B-Spline Surfaces on Arbitrary Topological Meshes
Correctness: Validated by use in actual film production rather than a formal benchmark; the semi-sharp crease and shading techniques are engineering solutions tuned for that pipeline, so generality beyond it should not be assumed.
Clarity: Quite accessible for its topic and grounded in a concrete production; a first pass conveys the techniques, a second pass clarifies the crease and scalar-field mechanics.
How to read it: First pass for why subdivision surfaces suit characters and what semi-sharp creases buy you; second pass on the crease rules and scalar-field shading if you work on modeling or shading tools.

Builds on

Recursively Generated B-Spline Surfaces on Arbitrary Topological Meshes 1978

Built upon by

Harmonic Coordinates for Character Articulation 2007

Related work

Recursively Generated B-Spline Surfaces on Arbitrary Topological Meshes 1978 / Tech Note
Robust Treatment of Collisions, Contact and Friction for Cloth Animation 2002 / SIGGRAPH
Automatic Rigging and Animation of 3D Characters 2007 / SIGGRAPH
Subspace Neural Physics: Fast Data-Driven Interactive Simulation 2019 / SCA

Keywords

subdivision surfaces catmull-clark character animation surface modeling semi-sharp creases cloth simulation collision detection scalar fields procedural shaders smooth surfaces topological freedom variable-radius fillets

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