3dprint@gentoo.org Gentoo 3D Printer Project The Clipper library performs line & polygon clipping - intersection, union, difference & exclusive-or, and line & polygon offsetting. The library is based on Vatti's clipping algorithm. https://sourceforge.net/p/polyclipping/bugs/ http://www.angusj.com/delphi/clipper/documentation/Docs/Overview/_Body.htm polyclipping