Hello, I was wondering if there is any post that explains what the "phantom bodies" are. They are bodies without center of mass and inertia. I use MoBL-ARMS dynamic upper limb model - OpenSim 3.2+. In the model, they are called scapphand, humphant, humphant1, and clavphant. What are their function? ...

I would also like to know about the "phantom bodies". In the model that I use (MoBL-ARMS dynamic upper limb model - OpenSim 3.2+), they do have some small mass assigned to it (10^-4 kg). Would mass in these bodies change inverse kinematics and dynamics results?