Efficient elasticity for character skinning with contact and collisions

  • Authors:

  • Aleka McAdams;Yongning Zhu;Andrew Selle;Mark Empey;Rasmus Tamstorf;Joseph Teran;Eftychios Sifakis

  • Affiliations:

  • Walt Disney Animation Studios and University of California, Los Angeles;PDI/DreamWorks;Walt Disney Animation Studios;Walt Disney Animation Studios;Walt Disney Animation Studios;University of California, Los Angeles and Walt Disney Animation Studios;University of Wisconsin, Madison and Walt Disney Animation Studios

  • Venue:
  • ACM SIGGRAPH 2011 papers
  • Year:
  • 2011

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Abstract

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.