Optimized Processing of Localized Collisions in Projective Dynamics

Optimized Processing of Localized Collisions in Projective Dynamics
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射影动力学中局部碰撞的优化处理

DOI:
10.1111/cgf.14385
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发表时间:
2021
影响因子:
2.5
通讯作者:
Sifakis, Eftychios
Sifakis, Eftychios
中科院分区:
计算机科学4区
文献类型:
--
作者:
Wang, Qisi;Tao, Yutian;Brandt, Eric;Cutting, Court;Sifakis, Eftychios

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我们提出了一种方法,有效地处理接触和碰撞的体积弹性模型模拟使用投影动力学范式。我们的方法使超过50万个元素的四面体网格的交互式模拟,只要模型满足两个基本属性:该区域的模型的表面,容易发生碰撞事件需要提前知道,和模拟度的自由度与该表面区域应限于一小部分(如5%)的总模拟节点。在这种情况下,部分Cholesky因子分解可以将面部模型的碰撞安全子集的行为抽象为关于易碰撞区域的Schur补矩阵。我们展示了如何快速和准确地更新双边基于惩罚的碰撞项可以纳入这种表示,并在GPU上高效解决。我们还演示了迭代元素旋转的部分更新,类似于局部步骤的选择性应用,特别是在较小的易碰撞区域上,而无需显式支付与模拟网格其余部分相关的成本。我们在动画和医疗应用的详细模型中展示了高效且强大的交互式模拟。
We present a method for the efficient processing of contact and collision in volumetric elastic models simulated using the Projective Dynamics paradigm. Our approach enables interactive simulation of tetrahedral meshes with more than half a million elements, provided that the model satisfies two fundamental properties: the region of the model's surface that is susceptible to collision events needs to be known in advance, and the simulation degrees of freedom associated with that surface region should be limited to a small fraction (e.g. 5%) of the total simulation nodes. In such scenarios, a partial Cholesky factorization can abstract away the behaviour of the collision‐safe subset of the face model into the Schur Complement matrix with respect to the collision‐prone region. We demonstrate how fast and accurate updates of bilateral penalty‐based collision terms can be incorporated into this representation, and solved with high efficiency on the GPU. We also demonstrate iterating a partial update of the element rotations, akin to a selective application of the local step, specifically on the smaller collision‐prone region without explicitly paying the cost associated with the rest of the simulation mesh. We demonstrate efficient and robust interactive simulation in detailed models from animation and medical applications.
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