4.7 Article

Adaptive Nonlinearity for Collisions in Complex Rod Assemblies

Journal

ACM TRANSACTIONS ON GRAPHICS
Volume 33, Issue 4, Pages -

Publisher

ASSOC COMPUTING MACHINERY
DOI: 10.1145/2601097.2601100

Keywords

simulation; collisions; rods; hair; time-integration

Funding

  1. NSF [IIS-1319483, CMMI-1331499, IIS-1217904, IIS-1117257, CMMI-1129917, IIS-0916129]
  2. Israel-US Binational Science Foundation
  3. Intel
  4. Walt Disney Company
  5. Weta Digital
  6. Side Effects
  7. Autodesk
  8. NVIDIA
  9. Directorate For Engineering
  10. Div Of Civil, Mechanical, & Manufact Inn [1129917, 1129894] Funding Source: National Science Foundation

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

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