{HEAD ~ One or more push force vectors} are applied to one or more force receiving locations of the model to push the model in an XY plane towards a silhouette of the human target in {TAIL ~ the observed depth image} when portions of the model are shifted away from the silhouette of the human target in the observed depth image 
{ HEAD ~ One or more push force vectors } are applied to one or more force receiving locations of the model to push the model in an XY plane towards a silhouette of the human target in { TAIL ~ the observed depth image } when portions of the model are shifted away from the silhouette of the human target in the observed depth image
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