Contact Geometry

Provide easy-to-use, extensible software for modeling, simulating, controlling, and analyzing the neuromusculoskeletal system.
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Margarida Machado
Posts: 16
Joined: Mon Apr 12, 2010 7:56 am

Contact Geometry

Post by Margarida Machado » Thu Aug 05, 2010 8:56 am

I would like to know if the OpenSim not accept an open-surface to define a contact geometry.
I tried to add a close-surface geometry and I could perform a force report analysis. However, when I added an open-surface (as flat mesh), I got the following error message: "unknown exception".
How can I solve this problem.
Thanks for your help.

Margarida

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Anne Schmitz
Posts: 76
Joined: Thu May 31, 2007 7:44 am

RE: Contact Geometry

Post by Anne Schmitz » Thu Aug 05, 2010 9:07 am

Hi Margarida,

I ran into similar issues when my meshes weren't water tight. Why do you need a a flat 2d mesh? Why not take the geometry and extrude it a little so that it is a watertight, 3d model?

Anne

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Ayman Habib
Posts: 2235
Joined: Fri Apr 01, 2005 12:24 pm

RE: Contact Geometry

Post by Ayman Habib » Thu Aug 05, 2010 9:13 am

Hi Margarida,

The collision detection algorithm in-use in OpenSim works only with closed surfaces (basically to resolve the issue of what's inside/outside). Sorry if that was not documented properly (the message/error wasn't descriptive. Please file a bug report for that), but you can extrude a plane to give it some thickness and that should do it.

Good luck,
-Ayman

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