In the preferred embodiment, that continuously modifies in real time, {HEAD ~ the point samples} are modified by {TAIL ~ 3D operators}, e.g., delete, update, and insert operators 
are modified by
In the preferred embodiment , that continuously modifies in real time , { HEAD ~ the point samples } are modified by { TAIL ~ 3D operators } , e.g. , delete , update , and insert operators
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH