Hello, I have a problem with the STL file. Please take a look at this: http://stackoverflow.com/questions/42869159/openscad-faces-are-duplicated-in-stl <http://stackoverflow.com/questions/42869159/openscad-faces-are-duplicated-in-stl> . -- View this message in context: http://forum.openscad.org/polyhedron-is-not-filled-internally-tp20947.html Sent from the OpenSCAD mailing list archive at Nabble.com.

The faces of the polygons that meet in the middle have the wrong winding order. If you press F12 you will see they are purple. Perhaps that is causing the issue. On 18 March 2017 at 10:16, Endre <ebak32@gmail.com> wrote: > Hello, > > I have a problem with the STL file. > Please take a look at this: > http://stackoverflow.com/questions/42869159/openscad- > faces-are-duplicated-in-stl > <http://stackoverflow.com/questions/42869159/openscad- > faces-are-duplicated-in-stl> > . > > > > -- > View this message in context: http://forum.openscad.org/ > polyhedron-is-not-filled-internally-tp20947.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 >

The last face should be [8, 3, 1, 0] in both cases. On 18 March 2017 at 10:59, nop head <nop.head@gmail.com> wrote: > The faces of the polygons that meet in the middle have the wrong winding > order. If you press F12 you will see they are purple. Perhaps that is > causing the issue. > > On 18 March 2017 at 10:16, Endre <ebak32@gmail.com> wrote: > >> Hello, >> >> I have a problem with the STL file. >> Please take a look at this: >> http://stackoverflow.com/questions/42869159/openscad-faces- >> are-duplicated-in-stl >> <http://stackoverflow.com/questions/42869159/openscad-faces- >> are-duplicated-in-stl> >> . >> >> >> >> -- >> View this message in context: http://forum.openscad.org/poly >> hedron-is-not-filled-internally-tp20947.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 >> > >

Thanks for the quick reply! I'll check. I have even tried to look for such issues with "Thrown Together" but I did not notice it. Perhaps I'll see it if I preview the model without mirroring. Can it cause a problem that the middle face is the mirror plane? So it is mirrored to itself with inverse normal. Here I have attached an image, I don't see the purple faces from outside. I can see purple only if I zoom inside the model. <http://forum.openscad.org/file/n20950/cobra.png> -- View this message in context: http://forum.openscad.org/polyhedron-is-not-filled-internally-tp20947p20950.html Sent from the OpenSCAD mailing list archive at Nabble.com.

Yes you need to remove one of the polyhedrons to see the problem. I think the union fails when its inputs are not manifold. I don't see any duplicate faces when I fix the polyhedrons. On 18 March 2017 at 11:11, Endre <ebak32@gmail.com> wrote: > Thanks for the quick reply! I'll check. > I have even tried to look for such issues with "Thrown Together" but I did > not notice it. > Perhaps I'll see it if I preview the model without mirroring. > > Can it cause a problem that the middle face is the mirror plane? So it is > mirrored to itself with inverse normal. > > Here I have attached an image, I don't see the purple faces from outside. I > can see purple only if I zoom inside the model. > <http://forum.openscad.org/file/n20950/cobra.png> > > > > -- > View this message in context: http://forum.openscad.org/ > polyhedron-is-not-filled-internally-tp20947p20950.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 >

Thank you very much! It has really solved the problem. -- View this message in context: http://forum.openscad.org/polyhedron-is-not-filled-internally-tp20947p20952.html Sent from the OpenSCAD mailing list archive at Nabble.com.