// Update rotation of all known joints
 public virtual void Update()
 {
     foreach (JointType jt in knownJoints.Keys)
     {
         // the applyRelativeRotationChange function returns the new "local rotation" relative to the RootTransform Rotation...
         Quaternion localRotTowardsRootTransform = MoCapAvatar.applyRelativeRotationChange(jt, initialModelJointRotations[jt]);
         // ...therefore we have to multiply it with the RootTransform Rotation to get the global rotation of the joint
         knownJoints[jt].rotation = RootTransform.rotation * localRotTowardsRootTransform;
     }
 }