On Thursday 22 April 2004 15:52, David Neary wrote: > I hope I'm not the only one asking myself this question... what > is a CSG operation? CSG stands for "Constructive Solid Geometry", and is used to refer to operations like "union", "intersection", "add" and "subtracting" geometric forms in a computer represented drawing. Obviously "Solid" doesn't apply here. :-) <joke> Maybe we could use "CPG" - Constructive Plain Geometry instead ?</joke> Nonetheless, the acronym is widely used enough that I and the at least those who replied on this thread could promptly understand what it was about. > > Cheers, > Dave.