I have tried to do some diff with a downloaded stl (https://grabcad.com/library/earth-globe) and always run into CGAL errors. I had a look at the ASCII stl and see a lot of vertices with negative coordinates. The stl definition states that vertices can only have positive coordinates. So my question is what is OpenScad doing when importing an stl with such negative coordinate values? The stl displays fine but when trying to cut out a part and render it it goes into CGAL errors. -- View this message in context: http://forum.openscad.org/stl-file-with-negative-values-for-vertices-tp20869.html Sent from the OpenSCAD mailing list archive at Nabble.com.

I doubt negative numbers are a problem. Most of my STLs are centred around 0 and I have never had a problem with them. On 13 March 2017 at 16:43, juerg.maier <juerg.maier@pobox.ch> wrote: > I have tried to do some diff with a downloaded stl > (https://grabcad.com/library/earth-globe) and always run into CGAL > errors. > I had a look at the ASCII stl and see a lot of vertices with negative > coordinates. > The stl definition states that vertices can only have positive coordinates. > So my question is what is OpenScad doing when importing an stl with such > negative coordinate values? > The stl displays fine but when trying to cut out a part and render it it > goes into CGAL errors. > > > > -- > View this message in context: http://forum.openscad.org/stl- > file-with-negative-values-for-vertices-tp20869.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >