Lodos-v2: 厳密な摩擦接触問題の効率的な主形式定式化
Lodos-v2: An Efficient Primal Formulation of the Exact Frictional Contact Problem
GPUベースの剛体シミュレーションLodosの改良版で、凸緩和を段階的に解くことで厳密な摩擦接触問題を効率的に解き、接触グループ再パラメータ化を主形式に拡張して関節制限などと統合可能にした。
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著者: Onur Beker, Andreas René Geist, Georg Martius
分類: cs.RO
原文アブストラクト
Lodos-v2 is a GPU-based simulation framework for massively parallel rigid-body dynamics with contact. It is specifically designed to achieve high throughput in scenes involving collisions among large numbers of detailed meshes. Its predecessor, Lodos-v1, had two main limitations. First, it solved the standard convex relaxation of cone-complementarity-based contact dynamics, thereby inheriting well-known physical artifacts, including lift-off and artificial compliance in the normal direction, as well as creep in the tangential direction. Second, its contact-group reparameterization scheme, which rescales spring-damper forces using a single factor per collision pair, could not be integrated with other constraints required by a full-fledged simulator, such as joint limits and welds. Lodos-v2 addresses both limitations through two main contributions. First, it introduces an efficient algorithm for solving the exact frictional contact problem by sequentially solving a cascade of convex relaxations in primal form within an outer proximal minimization loop. Second, it extends the contact-group reparameterization scheme of Lodos-v1 to the primal formulation of cone-complementarity-based contact dynamics, enabling its integration with the other constraints of a full-fledged simulator. Experiments demonstrate that these contributions result in throughput improvements over established rigid-body simulation frameworks. The source code is available at https://github.com/martius-lab/lodos.
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