Towards Real-time Simulation of Hyperelastic Materials.
arXiv: Graphics(2016)
摘要
We present a new method for real-time physics-based simulation supporting many different types of hyperelastic materials. Previous methods such as Position Based or Projective Dynamics are fast, but support only limited selection of materials; even classical such as the Neo-Hookean elasticity are not supported. Recently, Xu et al. [2015] introduced new materials which can be easily controlled by artists to achieve desired animation effects. Simulation of these types of currently relies on Newtonu0027s method, which is slow, even with only one iteration per timestep. In this paper, we show that Projective Dynamics can be interpreted as a quasi-Newton method. This insight enables very efficient simulation of a large class of hyperelastic materials, including the Neo-Hookean, spline-based materials, and others. The quasi-Newton interpretation also allows us to leverage ideas from numerical optimization. In particular, we show that our solver can be further accelerated using L-BFGS updates (Limited-memory Broyden-Fletcher-Goldfarb-Shanno algorithm). Our final method is typically more than 10 times faster than one iteration of Newtonu0027s method without compromising quality. In fact, our result is often more accurate than the result obtained with one iteration of Newtonu0027s method. Our method is also easier to implement, implying reduced software development costs.
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