I think of this as Constructive-Solid-Geometry (CSG). Hopefully you can find some help here.

http://www.alsprogrammingresource.com/csg.html

Well, I had a bunch of links for you, but I can only post one. Seems like a site this well monitored wouldn't need this restriction, but oh well.

Search google for Constructive-Solid-Geometry as a start.

HTH

I think of this as Constructive-Solid-Geometry (CSG). Hopefully you can find some help here.

http://www.alsprogrammingresource.com/csg.html

http://createuniverses.blogspot.com/2009/09/qtcsg-constructive-solid-geometry.html

http://www.nigels.com/research/

Also search google for Constructive Solid Geometry as a start.

HTH