We're constantly on the lookout for better engines (this is the holy grail of CAD software), so any suggestions are welcome! ![]() One free alternative is OpenCascade, but as far as I understand, they also do all CSG operations on triangle meshes, not smooth curves and surfaces. There are other engines out there, but most such engines are commercial and not possible to license for use in an Open Source program like OpenSCAD (in addition to being prohibitively expensive). We're using an engine called CGAL, which operates on a polygonal level. The issue is not the format used, but the geometry engine which does the calculations. True arcs could be defined by setting facets to zero or by leaving out that parameter (though I think that's already used?). Apparent IGES is a CSG based format or whatever, so some chatter back when I joined the list seemed to think it's possible. ![]() If it did, it could export to IGES and DXF and the files would actually be useful for real engineering and machining, not just tinkering and 3D printing. > Would it be possible to turn a part inside out, and create G-code for milling away, matching circles and arcs &c. ![]() > wherein I learned that it is limited to an internal polygonal representation. > I was quite thrilled w/ OpenSCAD until the following exchange:
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