i :=,iside,s)

Removes the group name s from the face identified by z and iside. The return value will be 0 if that group had not been assigned to that face. It will remove the group name from any slot it is found in.


i - 0 if the group is not found, nonzero otherwise


z - a zone pointer

iside - side of the zone indicating the face, from 1 to 6

str - the name of the group to remove