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Efficient and Accurate Collision Response for Elastically Deformable Models

Published: 14 March 2019 Publication History

Abstract

Simulating (elastically) deformable models that can collide with each other and with the environment remains a challenging task. The resulting contact problems can be elegantly approached using Lagrange multipliers to represent the unknown magnitude of the response forces. Typical methods construct and solve a Linear Complementarity Problem (LCP) to obtain the response forces. This requires the inverse of the generalized mass matrix, which is generally hard to obtain for deformable-body problems. In this article, we tackle such contact problems by directly solving the Mixed Linear Complementarity Problem (MLCP) and omitting the construction of an LCP matrix. Since a convex quadratic program with linear constraints is equivalent to an MLCP, we propose to use a Conjugate Residual (CR) solver as the backbone of our collision response system. By dynamically updating the set of active constraints, the MLCP with inequality constraints can be solved efficiently. We also propose a simple yet efficient preconditioner that ensures faster convergence. Finally, our approach is faster than existing methods (at the same accuracy), and it allows accurate treatment of friction.

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    cover image ACM Transactions on Graphics
    ACM Transactions on Graphics  Volume 38, Issue 2
    April 2019
    112 pages
    ISSN:0730-0301
    EISSN:1557-7368
    DOI:10.1145/3313807
    Issue’s Table of Contents
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    Publication History

    Published: 14 March 2019
    Accepted: 01 January 2019
    Revised: 01 October 2018
    Received: 01 November 2017
    Published in TOG Volume 38, Issue 2

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    Author Tags

    1. Collision response
    2. conjugate residual

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