I tried the Geomagic_RigidSkull.scn example of the Geomagic Plugin in Sofa v16.12 and realized that, during collision, the visual model and the collision model separate from each other.
Is this a result of the wrong compilation of Sofa? Has this happened to someone else and got it resolved?
Did you try with master branch?
I think this might be due to the FixedConstraint. FixedConstraint fixes the positions of some points. But during the collision, the velocity of the same points might be affected and increased. You could try replace the FixedConstraint with RestShapeSpringForceField, see if it works.