Fast animation and control of nonrigid structures

  • Authors:
  • Andrew Witkin;William Welch

  • Affiliations:
  • Carnegie Mellon University, Pittsburgh, PA;Carnegie Mellon University, Pittsburgh, PA

  • Venue:
  • SIGGRAPH '90 Proceedings of the 17th annual conference on Computer graphics and interactive techniques
  • Year:
  • 1990

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Abstract

We describe a fast method for creating physically based animationof non-rigid objects. Rapid simulation of non- rigid behavior isbased on global deformations. Con- straints are used to connectnon-rigid pieces to each other, forming complex models. Constraintsalso provide mo- tion control, allowing model points to be movedaccurately along specified trajectories. The use of deformationsthat are linear in the state of the system causes the constraintmatrices to be constant. Pre-inverting these matrices there- foreyields an enormous benefit in performance, allowing reasonablycomplex models to be manipulated at interac- tive speed.