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Home › Forum › SOFA › Using SOFA › [SOLVED] FixedConstraint not fixed
Hi everyone,
I used LCP, FreeAnimationLoop and FrictionContact for ContactResponse. I set some FixedConstraint to my object. When I pull the object, the fixed points still move. If I dont use FrictionContact, I dont have this problem. Any help is appreciated very much !
–Thien.
Hello Thien,
I just did some tests to understand your problem, but cannot reproduce it.
It is my understanding that the use of the FixedConstraint does not depend on the use of a LCP constraint solver, as it is indeed a projection constraint. It should also not be affected by the contact response you choose.
Is it possible that a contact occurs between a fixed point and another object in your simulation ?
—
Christophe Guébert
Digital-Trainers
I have similar but different experience. I used LCP, FreeAnimationLoop, FixedConstraint and precomputeConstraintCorrection, when I changed the fix index of vertices and did not re-compute the comp file, the fixed points will float away during the simulation.
What kind of ConstraintCorrection you are using ?
I have just modified the caduceus scene file by replace the snake by my object with some fixed points. I pull the object by mouse. When my object moves through the cylinder, i.e. collision resolve is failed, then some fixed points start floating around.
Hello,
The LCPConstrainstSolver is flawed and FixedConstraint is not working well with it.
Replace this LCPConstraintSolver component with a GenericConstraintSolver.
The point(s) should not move anymore.
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