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Thread: Rigid body rotations using rigid joints

  1. #1
    Join Date
    Jul 2017

    Default Negative Jacobians at random points

    He there

    I am attempting to get a knee extension model working, but there are some basics I can't get working before I even get there.

    I am first prescribing a displacement and pushing the patella into the femur to create contact, in the second step, just to test my contact I then apply a force pushing the patella into the femur, and I then get negative jacobians at arbitrary points on my femur cartilage that are not in contact with the patella cartilage.

    Does anyone have any ideas why I might be getting this problem only in the second step?

    Ultimately I would like to actually prescribe a motion simulating knee bending while simultaneously applying a quadriceps force, but I can't seem to get past applying a simple compression force.

    Thank you,
    Last edited by julianatk; 09-15-2017 at 05:16 AM.

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