Global Momentum Preservation for Position-based Dynamics
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Date
2019-10-28
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Citation of Original Publication
Alex Dahl and Adam W. Bargteil. 2019. Global Momentum Preservation for Position-based Dynamics. In Motion, Interaction and Games (MIG ’19), October 28–30, 2019, Newcastle upon Tyne, United Kingdom. ACM, New York, NY, USA, 5 pages; https://dl.acm.org/doi/10.1145/3359566.3360078
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Abstract
Position-based dynamics has emerged as an exceedingly popular approach for animating soft body dynamics. Unfortunately, the basic approach suffers from artificial loss of angular momentum. We propose a simple approach to preserve global linear and angular momenta of bodies by directly tracking these quantities and adjusting velocities to ensure they are preserved. This approach entails negligible computational cost, requires less than 25 lines of code, and exactly preserves global linear and angular momenta.