Adaptive Nonlinearity for Collisions in Complex Rod Assemblies

 

We develop an algorithm for the efficient and stable simulation of large-scale elastic rod assemblies.

July 27, 2014
ACM SIGGRAPH 2014

 

Authors

Danny M. Kaufman (Adobe/Columbia University)

Rasmus Tamstorf (Walt Disney Animation Studios)

Breannan Smith (Columbia University)

Jean-Marie Aubry (Weta Digital)

Eitan Grinspun (Columbia University)

Adaptive Nonlinearity for Collisions in Complex Rod Assemblies

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Abstract

We observe that the time integration step is severely restricted by a strong nonlinearity in the response of stretching modes to transversal impact, the degree of this nonlinearity varying greatly with the shape of the rod. Building on these observations, we propose a collision response algorithm that adapts its degree of nonlinearity. We illustrate the advantages of the resulting algorithm by analyzing simulations involving elastic rod assemblies of varying density and scale, with up to 1.7 million individual contacts per time step.

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