Physics-based simulation for biomechanics, virtual medicine and character animation

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Physics-based simulation forbiomechanics,
virtual medicineand character animation

• Eftychios Sifakis
• University of Wisconsin - Madison

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Face animation

• Modeling pipeline

Flesh geometry
Laser scans
Medicalimagery
Volumetricsimulation mesh
Anatomicaldatasets
Musculature
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Hybrid whole body simulation

• Hybrid mesh properties
• A non-graded, adaptive BCC meshfor elasticity
  (330K elements)
• An higher resolution surface meshfor collisions
  (370K triangles)
• A point set for boundary conditions(flesh
  attachments to bones)

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Embedded mesh generation

• Formulated as a cutting algorithm
• Material can be carved from an embedding volume
  using the material surface as the cutting
  geometry
• Embedded material can be further cut as needed

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Cutting and virtual surgery

• A flexible (geometric) cutting algorithm is
  needed
• No restriction on cut geometry
• Support for intersecting cuts, and incremental
  cutting
• Simulation support by the hybrid solids
  formulation
• Embedded simulations in well-conditioned base
  meshes
• Decoupling of elasticity simulation and collision
  handling

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Cutting and virtual surgery

• Surgical examples Z-plasty

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High-resolution elastic models