I am working on a motion analysis of bone movement. I have given a bone 3 motors (on 3 planes) and they move perfectly. I would like to add a torque as an intervention but it could not be calculated simultaneously with the 3 motors. The torque is running in an opposite direction with one of the motors. So I suppressed the 3 motors and try calculated the motor by itself. It works! So I wonder if anyone knows how to tackle this problem.