Cubic shells

  • Authors:
  • Akash Garg;Eitan Grinspun;Max Wardetzky;Denis Zorin

  • Affiliations:
  • Columbia University;Columbia University;Freie Universität Berlin, Germany;New York University

  • Venue:
  • SCA '07 Proceedings of the 2007 ACM SIGGRAPH/Eurographics symposium on Computer animation
  • Year:
  • 2007

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Abstract

Hinge-based bending models are widely used in the physically-based animation of cloth, thin plates and shells. We propose a hinge-based model that is simpler to implement, more efficient to compute, and offers a greater number of effective material parameters than existing models. Our formulation builds on two mathematical observations: (a) the bending energy of curved flexible surfaces can be expressed as a cubic polynomial if the surface does not stretch; (b) a general class of anisotropic materials---those that are orthotropic---is captured by appropriate choice of a single stiffness per hinge. Our contribution impacts a general range of surface animation applications, from isotropic cloth and thin plates to orthotropic fracturing thin shells.