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Motion from Shape Change

Published: 26 July 2023 Publication History

Abstract

We consider motion effected by shape change. Such motions are ubiquitous in nature and the human made environment, ranging from single cells to platform divers and jellyfish. The shapes may be immersed in various media ranging from the very viscous to air and nearly inviscid fluids. In the absence of external forces these settings are characterized by constant momentum. We exploit this in an algorithm which takes a sequence of changing shapes, say, as modeled by an animator, as input and produces corresponding motion in world coordinates. Our method is based on the geometry of shape change and an appropriate variational principle. The corresponding Euler-Lagrange equations are first order ODEs in the unknown rotations and translations and the resulting time stepping algorithm applies to all these settings without modification as we demonstrate with a broad set of examples.

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Published In

cover image ACM Transactions on Graphics
ACM Transactions on Graphics  Volume 42, Issue 4
August 2023
1912 pages
ISSN:0730-0301
EISSN:1557-7368
DOI:10.1145/3609020
Issue’s Table of Contents
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Association for Computing Machinery

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Publication History

Published: 26 July 2023
Published in TOG Volume 42, Issue 4

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Author Tags

  1. locomotion
  2. shape space
  3. physical modeling
  4. minimal dissipation
  5. least action
  6. kirchhoff tensor

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  • Research-article

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  • Funded by the Deutsche Forschungsgemeinschaft (DFG - German Research Foundation) - Project-ID 195170736 - TRR109
  • Einstein Foundation Berlin

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