So that will be why it is implemented as a proper 3D polyhedron, rather than a single face. I would guess the edges aren't needed, so perhaps a pair of faces back to back would work. On Tue, 7 Jul 2020 at 11:54, Parkinbot <rudolf@digitaldocument.de> wrote: > You can try it out. Unions work, but intersection() and difference() > produce > no result with F5. With F6 the result is correct but you get a warning ... > > try it out ... > > intersection() > { > poly(circle()); > translate([10, 0, 0]) poly(circle()); > } > > > > nophead wrote > > What happens if you try to do a 2D CSG op on a single face > > polyhedron in preview? > > > > > > > -- > Sent from: http://forum.openscad.org/ > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >