@Override
    protected void setPhysicsRotation(Quaternion quat) {
        torsoLink.getRigidBody().setPhysicsRotation(quat);
    }
Rotate the torso to the specified orientation.

@param quat desired orientation (not null, unaffected)
jme3-jbullet/src/main/java/com/jme3/bullet/animation/DacLinks.java