Practical Physics/Dynamics

• This ranges from “Objects don’t go through walls” up to full fluid dynamics and finite element modeling

• Or, the animation can be generated with no realistic physics at all

• In general, you need to make things run fast

  • Quick convergence of iterative schemes
  • good approximate algorithms

• Viewers can be pretty tolerant of things like incorrect bounces

• This shift from accuracy to fast-and-looks-good is what distinguishes physically based CG from numerical science.

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