int setpointgroup(int geohandle, string name, int point_num, int value, string mode="set")
A handle to the geometry to write to. Currently the only valid value is
0 or geoself, which means the current geometry in a node. (This argument may be used in the future to allow writing to other geometries.)
The name of the group to modify.
The point number to add or remove from the group.
1 to put the point in the group,
0 to remove the point from the group.
This is ignored if
"set" to set the point’s membership according to the
"toggle" to toggle the point’s membership, regardless of the