Journal
ACM TRANSACTIONS ON GRAPHICS
Volume 30, Issue 4, Pages -Publisher
ASSOC COMPUTING MACHINERY
DOI: 10.1145/1964921.1964932
Keywords
skinning; corotated elasticity; physics-based modeling; elastic deformations
Categories
Funding
- NSF [DMS-0502315, DMS-0652427, CCF-0830554]
- DOE [09-LR-04-116741-BERA]
- ONR [N000140310071, N000141010730]
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We present a new algorithm for near-interactive simulation of skeleton driven, high resolution elasticity models. Our methodology is used for soft tissue deformation in character animation. The algorithm is based on a novel discretization of corotational elasticity over a hexahedral lattice. Within this framework we enforce positive definiteness of the stiffness matrix to allow efficient quasistatics and dynamics. In addition, we present a multigrid method that converges with very high efficiency. Our design targets performance through parallelism using a fully vectorized and branch-free SVD algorithm as well as a stable one-point quadrature scheme. Since body collisions, self collisions and soft-constraints are necessary for real-world examples, we present a simple framework for enforcing them. The whole approach is demonstrated in an end-to-end production-level character skinning system.
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