ok repost my idea about a python many usefull for animator: - tracking 2d/3d for P4 PP and later - example: You import a footage in poser (in footage a real ball red move up and down) with this python i can lock the color of this ball to the hip of a character. note: Maybe will better create a parent from a marker() (you would can rename inside the python interface) and a joint of the character. About the rotation of body part will see later ... ()this marker can move with tracking from a color or a contrast luminace zone best regards; Andygraph