i have tested the tool. it lists the stl vertices as polyhedron points correctly. buf if you look into the face indices, you will a strictly increasing number grouped into triples which is not very clever. This means, that same point can have several vertex indices that means at a given corner no algorithm can sort the faces around the corner easily which is not very manifold. Apart from that: stl import is no better or worse as polyhedron data. if its not manifold, cgal could have problems with it. On Tue, Jul 18, 2023 at 7:17 PM Roger Whiteley via Discuss < discuss@lists.openscad.org> wrote: > > > > ---------- Forwarded message ---------- > From: Roger Whiteley <roger.whiteley@me.com> > To: discuss@lists.openscad.org > Cc: > Bcc: > Date: Tue, 18 Jul 2023 18:17:14 +0100 > Subject: [OpenSCAD] Re: Making adjustments to an STL in OpenSCAD? > Terry, There is an online STL to OpenSCAD convertor here - > https://raviriley.github.io/STL-to-OpenSCAD-Converter/ > > Generates an array of points which are downloadable as a .SCAD file. > > Works a treat, don't bother trying to edit the points, just generate the > model and perform any other OpenSCAD operation that you need. > > I've been trying to tweak the JavaScript on my offline version to > improve the usability of the output as its a non-Line feed delimited > character stream that makes the OpenSCAD editor creak. I'm getting there > :-). > > In the meantime I just <include the downloaded file> into another > OpenSCAD file, then its all good. > > HTH > > Roger. > > > > ---------- Forwarded message ---------- > From: Roger Whiteley via Discuss <discuss@lists.openscad.org> > To: discuss@lists.openscad.org > Cc: Roger Whiteley <roger.whiteley@me.com> > Bcc: > Date: Tue, 18 Jul 2023 18:17:14 +0100 > Subject: [OpenSCAD] Re: Making adjustments to an STL in OpenSCAD? > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >