Efficient enforcement of hard articulation constraints in the presence of closed loops and contacts
Efficient enforcement of hard articulation constraints in the presence of closed loops and contacts
复制标题
在存在闭环和接触的情况下有效执行硬关节约束
DOI:
10.1111/cgf.12322
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发表时间:
2014
影响因子:
2.5
通讯作者:
Kobbelt L
中科院分区:
文献类型:
--
作者:
Tomcin R;Sibbing D;Kobbelt L
In rigid body simulation, one must distinguish between contacts (so‐called unilateral constraints) and articulations (bilateral constraints). For contacts and friction, iterative solution methods have proven most useful for interactive applications, often in combination with Shock‐Propagation in cases with strong interactions between contacts (such as stacks), prioritizing performance and plausibility over accuracy. For articulation constraints, direct solution methods are preferred, because one can rely on a factorization with linear time complexity for tree‐like systems, even in ill‐conditioned cases caused by large mass‐ratios or high complexity. Despite recent advances, combining the advantages of direct and iterative solution methods wrt. performance has proven difficult and the intricacy of articulations in interactive applications is often limited by the convergence speed of the iterative solution method in the presence of closed kinematic loops (i.e. auxiliary constraints) and contacts. We identify common performance bottlenecks in the dynamic simulation of unilateral and bilateral constraints and are able to present a simulation method, that scales well in the number of constraints even in ill‐conditioned cases with frictional contacts, collisions and closed loops in the kinematic graph. For cases where many joints are connected to a single body, we propose a technique to increase the sparsity of the positive definite linear system. A solution to these bottlenecks is presented in this paper to make the simulation of a wider range of mechanisms possible in real‐time without extensive parameter tuning.
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DOI:
--
发表时间:
2007-11
期刊:
Bulletin of the Society for Science on Form
影响因子:
--
作者:
山田 祐;平田 隆幸
通讯作者:
山田 祐;平田 隆幸
DOI:
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发表时间:
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影响因子:
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作者:
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发表时间:
2006
期刊:
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作者:
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DOI:
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发表时间:
2005
期刊:
影响因子:
--
作者:
Jan Bender;Dieter Finkenzeller;Alfred A. Schmitt
通讯作者:
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DOI:
10.1145/588272.588280
发表时间:
2003
期刊:
ACM Trans. Graph.
影响因子:
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作者:
P. Kry;D. Pai
通讯作者:
D. Pai