faces=[
  [0,3,2,1], //unten
  [5,4,0,1], //stirn links
  [1,2,6,10,11,5], //hinten
  [2,3,7,6], //stirn rechts
  [0,4,8,9,7,3], //vorne
  [4,5,11,8], [8,11,10,9], [9,10,6,7]  //oben
  ]
  );

Hello, so my previous question was stupid enough :D so i went into looking to achieve the desired result directly by using the polyhedrons, and here's the next dumb question: if you activate the difference on line 36, everything vanishes :( why?? (same for union BTW....) l = 3; dlu = 1.4; dlo = 2.9; w= 30; h= 11.5; uo = 9; uxo = 25; uxu = 27; module einschubForm(untereBr,obereBr,absend,absanf,abshoehe,hoehe,breite) { obVerjBreite = (obereBr-untereBr)*abshoehe/hoehe+untereBr; polyhedron( points=[[-untereBr,0,0], [untereBr,0,0], [untereBr,breite,0], [-untereBr,breite,0], //unteres Rechteck [-obereBr,0,hoehe],[obereBr,0,hoehe], [obVerjBreite,breite,abshoehe],[-obVerjBreite,breite,abshoehe] //oberes Rechteck ,[-obVerjBreite,absanf,hoehe], [-obVerjBreite,absend, abshoehe], [obVerjBreite,absend, abshoehe], [obVerjBreite,absanf,hoehe] //Absenkung ,[-untereBr,absanf,0], [-untereBr,absend, 0], [untereBr,absend, 0], [untereBr,absanf,0] ], faces=[ [0,3,2,1], //unten [5,4,0,1], //stirn links [1,2,6,10,11,5], //hinten [2,3,7,6], //stirn rechts [0,4,8,9,7,3], //vorne [4,5,11,8], [8,11,10,9], [9,10,6,7] //oben ] ); } posx = 11.1; posy = 0; posz = 1.71; translate([posx,posy,posz]) { //difference() //{ einschubForm(dlu,dlo,uxu,uxo,uo,h,w); color("blue") translate([1,1.5,1])scale(v = [1, .9, .8]) einschubForm(dlu,dlo,uxu,uxo,uo,h,w); //} } -- ciao Bruno =========================================== http://nohkumado.eu/, <http://bboett.free.fr>http://aikido.nohkumado.eu/, <http://bboett.free.fr> http://aikido.zorn.free.fr

On 20.07.19 17:32, Bruno Boettcher wrote: > if you activate the difference on line 36, everything vanishes :( > why?? (same for union BTW....) The polyhedron is inside out, all faces have the points listed in reverse order. See: https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/FAQ#Why_is_my_model_showing_up_with_F5_but_not_F6? ciao, Torsten.

I did some experimenting with that, as long as it is consistent, openscad does the right thing. Not sure if the two polyhedra need to be consistent with each other though On Sat, 20 Jul 2019, 11:48 Torsten Paul, <Torsten.Paul@gmx.de> wrote: > On 20.07.19 17:32, Bruno Boettcher wrote: > > if you activate the difference on line 36, everything vanishes :( > > why?? (same for union BTW....) > > The polyhedron is inside out, all faces have the points listed > in reverse order. > > See: > https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/FAQ#Why_is_my_model_showing_up_with_F5_but_not_F6 > ? > > ciao, > Torsten. > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

ok! thanks! heh, understood the doc inversely.... ciao Bruno Am Sa., 20. Juli 2019 um 17:48 Uhr schrieb Torsten Paul <Torsten.Paul@gmx.de >: > On 20.07.19 17:32, Bruno Boettcher wrote: > > if you activate the difference on line 36, everything vanishes :( > > why?? (same for union BTW....) > > The polyhedron is inside out, all faces have the points listed > in reverse order. > > See: > https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/FAQ#Why_is_my_model_showing_up_with_F5_but_not_F6 > ? > > ciao, > Torsten. > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > -- ciao Bruno =========================================== http://nohkumado.eu/, <http://bboett.free.fr>http://aikido.nohkumado.eu/, <http://bboett.free.fr> http://aikido.zorn.free.fr

On 20.07.19 17:50, A. Craig West wrote: > I did some experimenting with that, as long as it is consistent, > openscad does the right thing. Not sure if the two polyhedra > need to be consistent with each other though  The underlying library doing the CSG operations (libCGAL) might randomly do the right thing. Relying on that may end in trouble at any time with any changes of the environment (e.g. changing to a different machine, using a different OpenSCAD build, or maybe just because the OS is running for more than 6 days without reboot). The expected winding order of polyhedron faces is defined, anything else may work but the result is in general completely undefined. So my advice is to always use the winding documented order. ciao, Torsten.

On 2019-07-20 17:50, A. Craig West wrote: > I did some experimenting with that, as long as it is consistent, > openscad does the right thing. The face normal defines the direction of void ("out of material"). In case of an inverted polyhedron with normal pointing inside the volume, the material is infinite in all directions except inside the polyhedron volume. One should always make sure a polyhedron is properly defined. Carsten Arnholm