I have a problem rendering polyhedra built using a fairly lengthy OpenSCAD script. The following short script demonstrates the issue. Any help appreciated, thanks! // CUBE size=60 // Meshed with 2 triangles per face, except face x=0 which has 4 triangles // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. // If set to true, draws 2 cubes, on render: // "WARNING: Object may not be a valid 2-manifold and may need repair!" Show_Rendering_Error=true; p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], [0,0,60],[60,0,60],[60,60,60],[0,60,60], [0,30,0],[0,30,60]]; f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 [1,0,4],[1,4,5], // face y=0 [1,3,0],[2,3,1], // face z=0 [1,5,2],[2,5,6], // face x=60 [2,7,3],[6,7,2], // face y=60 [5,4,7],[5,7,6]]; // face z=60 polyhedron(points=p,faces=f); if (Show_Rendering_Error) translate([120,0,0]) polyhedron(points=p,faces=f); -- View this message in context: http://forum.openscad.org/Rendering-error-using-polyhedron-tp13336.html Sent from the OpenSCAD mailing list archive at Nabble.com.

You stitched your cube correctly. The face x=0 is made up of 4 triangles. Do you have problems with the exported STL? 2015-07-28 17:02 GMT+02:00 Trygon <db5765@outlook.com>: > I have a problem rendering polyhedra built using a fairly lengthy OpenSCAD > script. The following short script demonstrates the issue. Any help > appreciated, thanks! > > // CUBE size=60 > // Meshed with 2 triangles per face, except face x=0 which has 4 triangles > > // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. > // If set to true, draws 2 cubes, on render: > // "WARNING: Object may not be a valid 2-manifold and may need repair!" > Show_Rendering_Error=true; > > p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], > [0,0,60],[60,0,60],[60,60,60],[0,60,60], > [0,30,0],[0,30,60]]; > > f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 > [1,0,4],[1,4,5], // face y=0 > [1,3,0],[2,3,1], // face z=0 > [1,5,2],[2,5,6], // face x=60 > [2,7,3],[6,7,2], // face y=60 > [5,4,7],[5,7,6]]; // face z=60 > > polyhedron(points=p,faces=f); > if (Show_Rendering_Error) translate([120,0,0]) > polyhedron(points=p,faces=f); > > > > > > -- > View this message in context: > http://forum.openscad.org/Rendering-error-using-polyhedron-tp13336.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 > -- stempeldergeschichte@googlemail.com <karsten@rohrbach.de> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu schreiben. Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. P.S. In case my e-mail is shorter than you enjoy: I am currently trying short replies instead of no replies at all. Please let me know, if you like to read more. Enjoy!

I don't think it is a valid triangulation because the vertices at 30 meet the side of the triangles on the top and bottom, not at a vertex. On 28 July 2015 at 17:03, Peter Falke <stempeldergeschichte@googlemail.com> wrote: > You stitched your cube correctly. > The face x=0 is made up of 4 triangles. > > Do you have problems with the exported STL? > > > 2015-07-28 17:02 GMT+02:00 Trygon <db5765@outlook.com>: > >> I have a problem rendering polyhedra built using a fairly lengthy OpenSCAD >> script. The following short script demonstrates the issue. Any help >> appreciated, thanks! >> >> // CUBE size=60 >> // Meshed with 2 triangles per face, except face x=0 which has 4 triangles >> >> // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. >> // If set to true, draws 2 cubes, on render: >> // "WARNING: Object may not be a valid 2-manifold and may need >> repair!" >> Show_Rendering_Error=true; >> >> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >> [0,30,0],[0,30,60]]; >> >> f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >> [1,0,4],[1,4,5], // face y=0 >> [1,3,0],[2,3,1], // face z=0 >> [1,5,2],[2,5,6], // face x=60 >> [2,7,3],[6,7,2], // face y=60 >> [5,4,7],[5,7,6]]; // face z=60 >> >> polyhedron(points=p,faces=f); >> if (Show_Rendering_Error) translate([120,0,0]) >> polyhedron(points=p,faces=f); >> >> >> >> >> >> -- >> View this message in context: >> http://forum.openscad.org/Rendering-error-using-polyhedron-tp13336.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 >> > > > > -- > stempeldergeschichte@googlemail.com <karsten@rohrbach.de> > > P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: > Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu > schreiben. > Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. > > P.S. In case my e-mail is shorter than you enjoy: > I am currently trying short replies instead of no replies at all. > Please let me know, if you like to read more. > > Enjoy! > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > >

The problem starts if you do something with your cubes. Like subtracting a cylinder. // CUBE size=60 // Meshed with 2 triangles per face, except face x=0 which has 4 triangles // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. // If set to true, draws 2 cubes, on render: // "WARNING: Object may not be a valid 2-manifold and may need repair!" Show_Rendering_Error=true; p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], [0,0,60],[60,0,60],[60,60,60],[0,60,60], [0,30,0],[0,30,60]]; f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 [1,0,4],[1,4,5], // face y=0 [1,3,0],[2,3,1], // face z=0 [1,5,2],[2,5,6], // face x=60 [2,7,3],[6,7,2], // face y=60 [5,4,7],[5,7,6]]; // face z=60 difference(){ union(){ polyhedron(points=p,faces=f); if (Show_Rendering_Error) translate([120,0,0]) polyhedron(points=p,faces=f); } rotate([0,90,0])translate([0,0,-10])cylinder(200,35,35); } ​ 2015-07-28 18:13 GMT+02:00 nop head <nop.head@gmail.com>: > I don't think it is a valid triangulation because the vertices at 30 meet > the side of the triangles on the top and bottom, not at a vertex. > > On 28 July 2015 at 17:03, Peter Falke <stempeldergeschichte@googlemail.com > > wrote: > >> You stitched your cube correctly. >> The face x=0 is made up of 4 triangles. >> >> Do you have problems with the exported STL? >> >> >> 2015-07-28 17:02 GMT+02:00 Trygon <db5765@outlook.com>: >> >>> I have a problem rendering polyhedra built using a fairly lengthy >>> OpenSCAD >>> script. The following short script demonstrates the issue. Any help >>> appreciated, thanks! >>> >>> // CUBE size=60 >>> // Meshed with 2 triangles per face, except face x=0 which has 4 >>> triangles >>> >>> // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. >>> // If set to true, draws 2 cubes, on render: >>> // "WARNING: Object may not be a valid 2-manifold and may need >>> repair!" >>> Show_Rendering_Error=true; >>> >>> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >>> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >>> [0,30,0],[0,30,60]]; >>> >>> f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >>> [1,0,4],[1,4,5], // face y=0 >>> [1,3,0],[2,3,1], // face z=0 >>> [1,5,2],[2,5,6], // face x=60 >>> [2,7,3],[6,7,2], // face y=60 >>> [5,4,7],[5,7,6]]; // face z=60 >>> >>> polyhedron(points=p,faces=f); >>> if (Show_Rendering_Error) translate([120,0,0]) >>> polyhedron(points=p,faces=f); >>> >>> >>> >>> >>> >>> -- >>> View this message in context: >>> http://forum.openscad.org/Rendering-error-using-polyhedron-tp13336.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 >>> >> >> >> >> -- >> stempeldergeschichte@googlemail.com <karsten@rohrbach.de> >> >> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: >> Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu >> schreiben. >> Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. >> >> P.S. In case my e-mail is shorter than you enjoy: >> I am currently trying short replies instead of no replies at all. >> Please let me know, if you like to read more. >> >> Enjoy! >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > -- stempeldergeschichte@googlemail.com <karsten@rohrbach.de> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu schreiben. Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. P.S. In case my e-mail is shorter than you enjoy: I am currently trying short replies instead of no replies at all. Please let me know, if you like to read more. Enjoy!

I believe it's not possible to render two physically separated polyhedra. Check out another example here <http://forum.openscad.org/A-faces-function-for-simple-polyhedra-td12809.html> Using the solid objects seems to be ok, though: cube(20,30); translate( [50,0,0] ) cube(20,30); I have no idea why. Is it possible for a 3D printer to print multiple objects at the same time? If not, then rendering two objects makes no sense. If yes, why can't render multiple polyhedra ? ----- $ Runsun Pan, PhD $ -- libs: doctest , faces ( git ), offliner ( git ); tips: hash( 1 , 2 ), sweep , var $ -- Linux Mint 17.1 Rebecca x64 + OpenSCAD 2015.03.15/2015.04.01.nightly -- View this message in context: http://forum.openscad.org/Rendering-error-using-polyhedron-tp13336p13341.html Sent from the OpenSCAD mailing list archive at Nabble.com.

The problems remains even if you let OpenSCAD do the tessellation of the x=0 face: [3,7,9,4,0,8], // face x=0 // CUBE size=60 // Meshed with 2 triangles per face, except face x=0 which has 4 triangles // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. // If set to true, draws 2 cubes, on render: // "WARNING: Object may not be a valid 2-manifold and may need repair!" Show_Rendering_Error=true; p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], [0,0,60],[60,0,60],[60,60,60],[0,60,60], [0,30,0],[0,30,60]]; f=[ // [3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 [3,7,9,4,0,8], // face x=0 [1,0,4],[1,4,5], // face y=0 [1,3,0],[2,3,1], // face z=0 [1,5,2],[2,5,6], // face x=60 [2,7,3],[6,7,2], // face y=60 [5,4,7],[5,7,6]]; // face z=60 difference(){ union(){ polyhedron(points=p,faces=f); if (Show_Rendering_Error) translate([120,0,0]) polyhedron(points=p,faces=f); } rotate([0,90,0])translate([0,0,-10])cylinder(200,35,35); 2015-07-28 18:35 GMT+02:00 Peter Falke <stempeldergeschichte@googlemail.com> : > The problem starts if you do something with your cubes. > Like subtracting a cylinder. > > > > // CUBE size=60 > // Meshed with 2 triangles per face, except face x=0 which has 4 triangles > > // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. > // If set to true, draws 2 cubes, on render: > // "WARNING: Object may not be a valid 2-manifold and may need repair!" > Show_Rendering_Error=true; > > p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], > [0,0,60],[60,0,60],[60,60,60],[0,60,60], > [0,30,0],[0,30,60]]; > > f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 > [1,0,4],[1,4,5], // face y=0 > [1,3,0],[2,3,1], // face z=0 > [1,5,2],[2,5,6], // face x=60 > [2,7,3],[6,7,2], // face y=60 > [5,4,7],[5,7,6]]; // face z=60 > > difference(){ > union(){ > polyhedron(points=p,faces=f); > if (Show_Rendering_Error) translate([120,0,0]) > polyhedron(points=p,faces=f); > } > rotate([0,90,0])translate([0,0,-10])cylinder(200,35,35); > } > ​ > > 2015-07-28 18:13 GMT+02:00 nop head <nop.head@gmail.com>: > >> I don't think it is a valid triangulation because the vertices at 30 meet >> the side of the triangles on the top and bottom, not at a vertex. >> >> On 28 July 2015 at 17:03, Peter Falke < >> stempeldergeschichte@googlemail.com> wrote: >> >>> You stitched your cube correctly. >>> The face x=0 is made up of 4 triangles. >>> >>> Do you have problems with the exported STL? >>> >>> >>> 2015-07-28 17:02 GMT+02:00 Trygon <db5765@outlook.com>: >>> >>>> I have a problem rendering polyhedra built using a fairly lengthy >>>> OpenSCAD >>>> script. The following short script demonstrates the issue. Any help >>>> appreciated, thanks! >>>> >>>> // CUBE size=60 >>>> // Meshed with 2 triangles per face, except face x=0 which has 4 >>>> triangles >>>> >>>> // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. >>>> // If set to true, draws 2 cubes, on render: >>>> // "WARNING: Object may not be a valid 2-manifold and may need >>>> repair!" >>>> Show_Rendering_Error=true; >>>> >>>> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >>>> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >>>> [0,30,0],[0,30,60]]; >>>> >>>> f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >>>> [1,0,4],[1,4,5], // face y=0 >>>> [1,3,0],[2,3,1], // face z=0 >>>> [1,5,2],[2,5,6], // face x=60 >>>> [2,7,3],[6,7,2], // face y=60 >>>> [5,4,7],[5,7,6]]; // face z=60 >>>> >>>> polyhedron(points=p,faces=f); >>>> if (Show_Rendering_Error) translate([120,0,0]) >>>> polyhedron(points=p,faces=f); >>>> >>>> >>>> >>>> >>>> >>>> -- >>>> View this message in context: >>>> http://forum.openscad.org/Rendering-error-using-polyhedron-tp13336.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 >>>> >>> >>> >>> >>> -- >>> stempeldergeschichte@googlemail.com <karsten@rohrbach.de> >>> >>> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: >>> Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu >>> schreiben. >>> Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. >>> >>> P.S. In case my e-mail is shorter than you enjoy: >>> I am currently trying short replies instead of no replies at all. >>> Please let me know, if you like to read more. >>> >>> Enjoy! >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> Discuss@lists.openscad.org >>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>> >>> >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> > > > -- > stempeldergeschichte@googlemail.com <karsten@rohrbach.de> > > P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: > Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu > schreiben. > Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. > > P.S. In case my e-mail is shorter than you enjoy: > I am currently trying short replies instead of no replies at all. > Please let me know, if you like to read more. > > Enjoy! > -- stempeldergeschichte@googlemail.com <karsten@rohrbach.de> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu schreiben. Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. P.S. In case my e-mail is shorter than you enjoy: I am currently trying short replies instead of no replies at all. Please let me know, if you like to read more. Enjoy!

You simply can't have vertices at 30 on one face without them also being a vertex on the adjacent faces. The cube triangulated that way is not manifold so as soon as CGAL operates on it it fails. On 28 July 2015 at 17:40, Peter Falke <stempeldergeschichte@googlemail.com> wrote: > The problems remains even if you let OpenSCAD do the tessellation of the > x=0 > face: [3,7,9,4,0,8], // face x=0 > > // CUBE size=60 > // Meshed with 2 triangles per face, except face x=0 which has 4 triangles > > // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. > // If set to true, draws 2 cubes, on render: > // "WARNING: Object may not be a valid 2-manifold and may need repair!" > Show_Rendering_Error=true; > > p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], > [0,0,60],[60,0,60],[60,60,60],[0,60,60], > [0,30,0],[0,30,60]]; > > f=[ > // [3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 > [3,7,9,4,0,8], // face x=0 > [1,0,4],[1,4,5], // face y=0 > [1,3,0],[2,3,1], // face z=0 > [1,5,2],[2,5,6], // face x=60 > [2,7,3],[6,7,2], // face y=60 > [5,4,7],[5,7,6]]; // face z=60 > > difference(){ > union(){ > polyhedron(points=p,faces=f); > if (Show_Rendering_Error) translate([120,0,0]) > polyhedron(points=p,faces=f); > } > rotate([0,90,0])translate([0,0,-10])cylinder(200,35,35); > > 2015-07-28 18:35 GMT+02:00 Peter Falke < > stempeldergeschichte@googlemail.com>: > >> The problem starts if you do something with your cubes. >> Like subtracting a cylinder. >> >> >> >> // CUBE size=60 >> // Meshed with 2 triangles per face, except face x=0 which has 4 triangles >> >> // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. >> // If set to true, draws 2 cubes, on render: >> // "WARNING: Object may not be a valid 2-manifold and may need >> repair!" >> Show_Rendering_Error=true; >> >> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >> [0,30,0],[0,30,60]]; >> >> f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >> [1,0,4],[1,4,5], // face y=0 >> [1,3,0],[2,3,1], // face z=0 >> [1,5,2],[2,5,6], // face x=60 >> [2,7,3],[6,7,2], // face y=60 >> [5,4,7],[5,7,6]]; // face z=60 >> >> difference(){ >> union(){ >> polyhedron(points=p,faces=f); >> if (Show_Rendering_Error) translate([120,0,0]) >> polyhedron(points=p,faces=f); >> } >> rotate([0,90,0])translate([0,0,-10])cylinder(200,35,35); >> } >> ​ >> >> 2015-07-28 18:13 GMT+02:00 nop head <nop.head@gmail.com>: >> >>> I don't think it is a valid triangulation because the vertices at 30 >>> meet the side of the triangles on the top and bottom, not at a vertex. >>> >>> On 28 July 2015 at 17:03, Peter Falke < >>> stempeldergeschichte@googlemail.com> wrote: >>> >>>> You stitched your cube correctly. >>>> The face x=0 is made up of 4 triangles. >>>> >>>> Do you have problems with the exported STL? >>>> >>>> >>>> 2015-07-28 17:02 GMT+02:00 Trygon <db5765@outlook.com>: >>>> >>>>> I have a problem rendering polyhedra built using a fairly lengthy >>>>> OpenSCAD >>>>> script. The following short script demonstrates the issue. Any help >>>>> appreciated, thanks! >>>>> >>>>> // CUBE size=60 >>>>> // Meshed with 2 triangles per face, except face x=0 which has 4 >>>>> triangles >>>>> >>>>> // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. >>>>> // If set to true, draws 2 cubes, on render: >>>>> // "WARNING: Object may not be a valid 2-manifold and may need >>>>> repair!" >>>>> Show_Rendering_Error=true; >>>>> >>>>> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >>>>> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >>>>> [0,30,0],[0,30,60]]; >>>>> >>>>> f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >>>>> [1,0,4],[1,4,5], // face y=0 >>>>> [1,3,0],[2,3,1], // face z=0 >>>>> [1,5,2],[2,5,6], // face x=60 >>>>> [2,7,3],[6,7,2], // face y=60 >>>>> [5,4,7],[5,7,6]]; // face z=60 >>>>> >>>>> polyhedron(points=p,faces=f); >>>>> if (Show_Rendering_Error) translate([120,0,0]) >>>>> polyhedron(points=p,faces=f); >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> View this message in context: >>>>> http://forum.openscad.org/Rendering-error-using-polyhedron-tp13336.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 >>>>> >>>> >>>> >>>> >>>> -- >>>> stempeldergeschichte@googlemail.com <karsten@rohrbach.de> >>>> >>>> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: >>>> Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu >>>> schreiben. >>>> Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. >>>> >>>> P.S. In case my e-mail is shorter than you enjoy: >>>> I am currently trying short replies instead of no replies at all. >>>> Please let me know, if you like to read more. >>>> >>>> Enjoy! >>>> >>>> _______________________________________________ >>>> OpenSCAD mailing list >>>> Discuss@lists.openscad.org >>>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>>> >>>> >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> Discuss@lists.openscad.org >>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>> >>> >> >> >> -- >> stempeldergeschichte@googlemail.com <karsten@rohrbach.de> >> >> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: >> Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu >> schreiben. >> Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. >> >> P.S. In case my e-mail is shorter than you enjoy: >> I am currently trying short replies instead of no replies at all. >> Please let me know, if you like to read more. >> >> Enjoy! >> > > > > -- > stempeldergeschichte@googlemail.com <karsten@rohrbach.de> > > P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: > Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu > schreiben. > Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. > > P.S. In case my e-mail is shorter than you enjoy: > I am currently trying short replies instead of no replies at all. > Please let me know, if you like to read more. > > Enjoy! > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > >

Here is a version that works. I added the vertices at 30 to the facets they touch on the top and bottom faces. Show_Rendering_Error=true; p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], [0,0,60],[60,0,60],[60,60,60],[0,60,60], [0,30,0],[0,30,60]]; f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 [1,0,4],[1,4,5], // face y=0 [1,3,8,0],[2,3,1], // face z=0 [1,5,2],[2,5,6], // face x=60 [2,7,3],[6,7,2], // face y=60 [5,4,9,7],[5,7,6]]; // face z=60 polyhedron(points=p,faces=f); if (Show_Rendering_Error) translate([120,0,0]) polyhedron(points=p,faces=f); On 28 July 2015 at 17:52, nop head <nop.head@gmail.com> wrote: > You simply can't have vertices at 30 on one face without them also being a > vertex on the adjacent faces. The cube triangulated that way is not > manifold so as soon as CGAL operates on it it fails. > > On 28 July 2015 at 17:40, Peter Falke <stempeldergeschichte@googlemail.com > > wrote: > >> The problems remains even if you let OpenSCAD do the tessellation of the >> x=0 >> face: [3,7,9,4,0,8], // face x=0 >> >> // CUBE size=60 >> // Meshed with 2 triangles per face, except face x=0 which has 4 triangles >> >> // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. >> // If set to true, draws 2 cubes, on render: >> // "WARNING: Object may not be a valid 2-manifold and may need >> repair!" >> Show_Rendering_Error=true; >> >> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >> [0,30,0],[0,30,60]]; >> >> f=[ >> // [3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >> [3,7,9,4,0,8], // face x=0 >> [1,0,4],[1,4,5], // face y=0 >> [1,3,0],[2,3,1], // face z=0 >> [1,5,2],[2,5,6], // face x=60 >> [2,7,3],[6,7,2], // face y=60 >> [5,4,7],[5,7,6]]; // face z=60 >> >> difference(){ >> union(){ >> polyhedron(points=p,faces=f); >> if (Show_Rendering_Error) translate([120,0,0]) >> polyhedron(points=p,faces=f); >> } >> rotate([0,90,0])translate([0,0,-10])cylinder(200,35,35); >> >> 2015-07-28 18:35 GMT+02:00 Peter Falke < >> stempeldergeschichte@googlemail.com>: >> >>> The problem starts if you do something with your cubes. >>> Like subtracting a cylinder. >>> >>> >>> >>> // CUBE size=60 >>> // Meshed with 2 triangles per face, except face x=0 which has 4 >>> triangles >>> >>> // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. >>> // If set to true, draws 2 cubes, on render: >>> // "WARNING: Object may not be a valid 2-manifold and may need >>> repair!" >>> Show_Rendering_Error=true; >>> >>> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >>> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >>> [0,30,0],[0,30,60]]; >>> >>> f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >>> [1,0,4],[1,4,5], // face y=0 >>> [1,3,0],[2,3,1], // face z=0 >>> [1,5,2],[2,5,6], // face x=60 >>> [2,7,3],[6,7,2], // face y=60 >>> [5,4,7],[5,7,6]]; // face z=60 >>> >>> difference(){ >>> union(){ >>> polyhedron(points=p,faces=f); >>> if (Show_Rendering_Error) translate([120,0,0]) >>> polyhedron(points=p,faces=f); >>> } >>> rotate([0,90,0])translate([0,0,-10])cylinder(200,35,35); >>> } >>> ​ >>> >>> 2015-07-28 18:13 GMT+02:00 nop head <nop.head@gmail.com>: >>> >>>> I don't think it is a valid triangulation because the vertices at 30 >>>> meet the side of the triangles on the top and bottom, not at a vertex. >>>> >>>> On 28 July 2015 at 17:03, Peter Falke < >>>> stempeldergeschichte@googlemail.com> wrote: >>>> >>>>> You stitched your cube correctly. >>>>> The face x=0 is made up of 4 triangles. >>>>> >>>>> Do you have problems with the exported STL? >>>>> >>>>> >>>>> 2015-07-28 17:02 GMT+02:00 Trygon <db5765@outlook.com>: >>>>> >>>>>> I have a problem rendering polyhedra built using a fairly lengthy >>>>>> OpenSCAD >>>>>> script. The following short script demonstrates the issue. Any help >>>>>> appreciated, thanks! >>>>>> >>>>>> // CUBE size=60 >>>>>> // Meshed with 2 triangles per face, except face x=0 which has 4 >>>>>> triangles >>>>>> >>>>>> // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. >>>>>> // If set to true, draws 2 cubes, on render: >>>>>> // "WARNING: Object may not be a valid 2-manifold and may need >>>>>> repair!" >>>>>> Show_Rendering_Error=true; >>>>>> >>>>>> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >>>>>> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >>>>>> [0,30,0],[0,30,60]]; >>>>>> >>>>>> f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >>>>>> [1,0,4],[1,4,5], // face y=0 >>>>>> [1,3,0],[2,3,1], // face z=0 >>>>>> [1,5,2],[2,5,6], // face x=60 >>>>>> [2,7,3],[6,7,2], // face y=60 >>>>>> [5,4,7],[5,7,6]]; // face z=60 >>>>>> >>>>>> polyhedron(points=p,faces=f); >>>>>> if (Show_Rendering_Error) translate([120,0,0]) >>>>>> polyhedron(points=p,faces=f); >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> View this message in context: >>>>>> http://forum.openscad.org/Rendering-error-using-polyhedron-tp13336.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 >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> stempeldergeschichte@googlemail.com <karsten@rohrbach.de> >>>>> >>>>> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: >>>>> Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu >>>>> schreiben. >>>>> Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. >>>>> >>>>> P.S. In case my e-mail is shorter than you enjoy: >>>>> I am currently trying short replies instead of no replies at all. >>>>> Please let me know, if you like to read more. >>>>> >>>>> Enjoy! >>>>> >>>>> _______________________________________________ >>>>> OpenSCAD mailing list >>>>> Discuss@lists.openscad.org >>>>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> OpenSCAD mailing list >>>> Discuss@lists.openscad.org >>>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>>> >>>> >>> >>> >>> -- >>> stempeldergeschichte@googlemail.com <karsten@rohrbach.de> >>> >>> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: >>> Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu >>> schreiben. >>> Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. >>> >>> P.S. In case my e-mail is shorter than you enjoy: >>> I am currently trying short replies instead of no replies at all. >>> Please let me know, if you like to read more. >>> >>> Enjoy! >>> >> >> >> >> -- >> stempeldergeschichte@googlemail.com <karsten@rohrbach.de> >> >> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: >> Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu >> schreiben. >> Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. >> >> P.S. In case my e-mail is shorter than you enjoy: >> I am currently trying short replies instead of no replies at all. >> Please let me know, if you like to read more. >> >> Enjoy! >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> >

nophead wrote > I don't think it is a valid triangulation because the vertices at 30 meet > the side of the triangles on the top and bottom, not at a vertex. This is to illustrate nophead's point (The point-8 has the same issue, too) : <http://forum.openscad.org/file/n13345/20150728_wrong_triang_1.png> ----- $ Runsun Pan, PhD $ -- libs: doctest , faces ( git ), offliner ( git ); tips: hash( 1 , 2 ), sweep , var $ -- Linux Mint 17.1 Rebecca x64 + OpenSCAD 2015.03.15/2015.04.01.nightly -- View this message in context: http://forum.openscad.org/Rendering-error-using-polyhedron-tp13336p13345.html Sent from the OpenSCAD mailing list archive at Nabble.com.

​ On 28 July 2015 at 18:07, nop head <nop.head@gmail.com> wrote: > Here is a version that works. I added the vertices at 30 to the facets > they touch on the top and bottom faces. > > Show_Rendering_Error=true; > > p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], > [0,0,60],[60,0,60],[60,60,60],[0,60,60], > [0,30,0],[0,30,60]]; > > f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 > [1,0,4],[1,4,5], // face y=0 > [1,3,8,0],[2,3,1], // face z=0 > [1,5,2],[2,5,6], // face x=60 > [2,7,3],[6,7,2], // face y=60 > [5,4,9,7],[5,7,6]]; // face z=60 > > polyhedron(points=p,faces=f); > if (Show_Rendering_Error) translate([120,0,0]) > polyhedron(points=p,faces=f); > > > On 28 July 2015 at 17:52, nop head <nop.head@gmail.com> wrote: > >> You simply can't have vertices at 30 on one face without them also being >> a vertex on the adjacent faces. The cube triangulated that way is not >> manifold so as soon as CGAL operates on it it fails. >> >> On 28 July 2015 at 17:40, Peter Falke < >> stempeldergeschichte@googlemail.com> wrote: >> >>> The problems remains even if you let OpenSCAD do the tessellation of the >>> x=0 >>> face: [3,7,9,4,0,8], // face x=0 >>> >>> // CUBE size=60 >>> // Meshed with 2 triangles per face, except face x=0 which has 4 >>> triangles >>> >>> // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. >>> // If set to true, draws 2 cubes, on render: >>> // "WARNING: Object may not be a valid 2-manifold and may need >>> repair!" >>> Show_Rendering_Error=true; >>> >>> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >>> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >>> [0,30,0],[0,30,60]]; >>> >>> f=[ >>> // [3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >>> [3,7,9,4,0,8], // face x=0 >>> [1,0,4],[1,4,5], // face y=0 >>> [1,3,0],[2,3,1], // face z=0 >>> [1,5,2],[2,5,6], // face x=60 >>> [2,7,3],[6,7,2], // face y=60 >>> [5,4,7],[5,7,6]]; // face z=60 >>> >>> difference(){ >>> union(){ >>> polyhedron(points=p,faces=f); >>> if (Show_Rendering_Error) translate([120,0,0]) >>> polyhedron(points=p,faces=f); >>> } >>> rotate([0,90,0])translate([0,0,-10])cylinder(200,35,35); >>> >>> 2015-07-28 18:35 GMT+02:00 Peter Falke < >>> stempeldergeschichte@googlemail.com>: >>> >>>> The problem starts if you do something with your cubes. >>>> Like subtracting a cylinder. >>>> >>>> >>>> >>>> // CUBE size=60 >>>> // Meshed with 2 triangles per face, except face x=0 which has 4 >>>> triangles >>>> >>>> // If set to false, draws 1 cube, renders OK, imports into MeshLab OK. >>>> // If set to true, draws 2 cubes, on render: >>>> // "WARNING: Object may not be a valid 2-manifold and may need >>>> repair!" >>>> Show_Rendering_Error=true; >>>> >>>> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >>>> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >>>> [0,30,0],[0,30,60]]; >>>> >>>> f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >>>> [1,0,4],[1,4,5], // face y=0 >>>> [1,3,0],[2,3,1], // face z=0 >>>> [1,5,2],[2,5,6], // face x=60 >>>> [2,7,3],[6,7,2], // face y=60 >>>> [5,4,7],[5,7,6]]; // face z=60 >>>> >>>> difference(){ >>>> union(){ >>>> polyhedron(points=p,faces=f); >>>> if (Show_Rendering_Error) translate([120,0,0]) >>>> polyhedron(points=p,faces=f); >>>> } >>>> rotate([0,90,0])translate([0,0,-10])cylinder(200,35,35); >>>> } >>>> ​ >>>> >>>> 2015-07-28 18:13 GMT+02:00 nop head <nop.head@gmail.com>: >>>> >>>>> I don't think it is a valid triangulation because the vertices at 30 >>>>> meet the side of the triangles on the top and bottom, not at a vertex. >>>>> >>>>> On 28 July 2015 at 17:03, Peter Falke < >>>>> stempeldergeschichte@googlemail.com> wrote: >>>>> >>>>>> You stitched your cube correctly. >>>>>> The face x=0 is made up of 4 triangles. >>>>>> >>>>>> Do you have problems with the exported STL? >>>>>> >>>>>> >>>>>> 2015-07-28 17:02 GMT+02:00 Trygon <db5765@outlook.com>: >>>>>> >>>>>>> I have a problem rendering polyhedra built using a fairly lengthy >>>>>>> OpenSCAD >>>>>>> script. The following short script demonstrates the issue. Any help >>>>>>> appreciated, thanks! >>>>>>> >>>>>>> // CUBE size=60 >>>>>>> // Meshed with 2 triangles per face, except face x=0 which has 4 >>>>>>> triangles >>>>>>> >>>>>>> // If set to false, draws 1 cube, renders OK, imports into MeshLab >>>>>>> OK. >>>>>>> // If set to true, draws 2 cubes, on render: >>>>>>> // "WARNING: Object may not be a valid 2-manifold and may need >>>>>>> repair!" >>>>>>> Show_Rendering_Error=true; >>>>>>> >>>>>>> p=[[0,0,0],[60,0,0],[60,60,0],[0,60,0], >>>>>>> [0,0,60],[60,0,60],[60,60,60],[0,60,60], >>>>>>> [0,30,0],[0,30,60]]; >>>>>>> >>>>>>> f=[[3,7,9],[9,8,3],[8,9,4],[0,8,4], // face x=0 >>>>>>> [1,0,4],[1,4,5], // face y=0 >>>>>>> [1,3,0],[2,3,1], // face z=0 >>>>>>> [1,5,2],[2,5,6], // face x=60 >>>>>>> [2,7,3],[6,7,2], // face y=60 >>>>>>> [5,4,7],[5,7,6]]; // face z=60 >>>>>>> >>>>>>> polyhedron(points=p,faces=f); >>>>>>> if (Show_Rendering_Error) translate([120,0,0]) >>>>>>> polyhedron(points=p,faces=f); >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> View this message in context: >>>>>>> http://forum.openscad.org/Rendering-error-using-polyhedron-tp13336.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 >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> stempeldergeschichte@googlemail.com <karsten@rohrbach.de> >>>>>> >>>>>> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: >>>>>> Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu >>>>>> schreiben. >>>>>> Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. >>>>>> >>>>>> P.S. In case my e-mail is shorter than you enjoy: >>>>>> I am currently trying short replies instead of no replies at all. >>>>>> Please let me know, if you like to read more. >>>>>> >>>>>> Enjoy! >>>>>> >>>>>> _______________________________________________ >>>>>> OpenSCAD mailing list >>>>>> Discuss@lists.openscad.org >>>>>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>>>>> >>>>>> >>>>> >>>>> _______________________________________________ >>>>> OpenSCAD mailing list >>>>> Discuss@lists.openscad.org >>>>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>>>> >>>>> >>>> >>>> >>>> -- >>>> stempeldergeschichte@googlemail.com <karsten@rohrbach.de> >>>> >>>> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: >>>> Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu >>>> schreiben. >>>> Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. >>>> >>>> P.S. In case my e-mail is shorter than you enjoy: >>>> I am currently trying short replies instead of no replies at all. >>>> Please let me know, if you like to read more. >>>> >>>> Enjoy! >>>> >>> >>> >>> >>> -- >>> stempeldergeschichte@googlemail.com <karsten@rohrbach.de> >>> >>> P.S. Falls meine E-Mail kürzer ausfällt als Dir angenehm ist: >>> Ich probiere gerade aus kurze Antworten statt gar keine Antworten zu >>> schreiben. >>> Wenn Du gerne mehr lesen möchtest, dann lass es mich bitte wissen. >>> >>> P.S. In case my e-mail is shorter than you enjoy: >>> I am currently trying short replies instead of no replies at all. >>> Please let me know, if you like to read more. >>> >>> Enjoy! >>> >>> _______________________________________________ >>> OpenSCAD mailing list >>> Discuss@lists.openscad.org >>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>> >>> >> >