CGAL users discussion list

[Helmi Ben Hmida <>]

Hello again,
Thanks for your reactions to my mail. I ll try to put u in the big 
picture. Theses off files are generated from a VRML file containing the 
set of elements composing a scene.
I´´m creating a small parser taking a vrml file as input and generating 
a set of off files as output correspondinf to the differents geometries 
existing inside.
Unfortuantely, there arealso  duplicates points, but is it here the 
problem, since even the corrected OFF resent to me does not correspond 
to a Polydehron.

PS: The form is not always a cube, but i´m sure it´s a closed one.
PS: Please find one element from the vrml file (if u d like all the vrml 
file, i can provide it to you)
Best

Thanks in adavance

  DEF Oid806_IfcWall_Wand__Mauerziegel_d_17_5_cm__i
  Shape
  {
   appearance Appearance
   {
    material Material
    {
     diffuseColor 0.8 0.8 0.8
    } # Material
   } # Appearance
   geometry IndexedFaceSet
   {
    ccw    TRUE
    convex TRUE
    solid  TRUE
    coordIndex
    [
     0 1 2 3 -1,
     4 5 6 7 -1,
     8 9 10 11 -1,
     12 13 14 15 -1,
     16 17 18 19 -1,
     20 21 22 23 -1
    ] # coordIndex
    coord Coordinate
    {
     point
     [
      19.454456 9.214429 9.195417,
      19.454456 9.214429 6,
      19.629456 9.214429 6,
      19.629456 9.214429 9.195417,
      19.629456 9.214429 9.195417,
      19.629456 9.214429 6,
      19.629456 13.049429 6,
      19.629456 13.049429 8.724564,
      19.629456 13.049429 8.724564,
      19.629456 13.049429 6,
      19.454456 13.049429 6,
      19.454456 13.049429 8.724564,
      19.454456 13.049429 8.724564,
      19.454456 13.049429 6,
      19.454456 9.214429 6,
      19.454456 9.214429 9.195417,
      19.454456 9.214429 6,
      19.454456 13.049429 6,
      19.629456 13.049429 6,
      19.629456 9.214429 6,
      19.629456 9.214429 9.195417,
      19.629456 13.049429 8.724564,
      19.454456 13.049429 8.724564,
      19.454456 9.214429 9.195417
     ] # Point
    } # Coordinate
    normal Normal
    {
     vector
     [
      -0 -1 0,
      -0 -1 0,
      -0 -1 0,
      -0 -1 0,
      1 -0 -0,
      1 -0 -0,
      1 -0 -0,
      1 -0 -0,
      0 1 0,
      0 1 0,
      0 1 0,
      0 1 0,
      -1 0 0,
      -1 0 0,
      -1 0 0,
      -1 0 0,
      0 0 -1,
      0 0 -1,
      0 0 -1,
      0 0 -1,
      0 0.121862767485053 0.992546959040671,
      0 0.121862767485053 0.992546959040671,
      0 0.121862767485053 0.992546959040671,
      0 0.121862767485053 0.992546959040671
     ] # Vector
    } # Normals
   } # Geometry
  } # Shape


Am 09.03.2012 00:01, schrieb Nicholas Mario Wardhana:
> On 9 March 2012 06:49, Helmi Ben Hmida
> <>
>   wrote:
> > Hello Again,
> > U re right, but, it did not resolve the problem.
> > Still empty polyderon !!!
> > Do any one know how o fix this please
> >
> >
> > This is the correct off
> >
> > OFF
> > #
> > #Oid806_IfcWall_Wand__Mauerziegel_d_17_5_cm__i.OFF
> > #
> > 24 6 24
> > 19.454456 9.214429 9.195417
> > 19.454456 9.214429 6
> > 19.629456 9.214429 6
> > 19.629456 9.214429 9.195417
> > 19.629456 9.214429 9.195417
> > 19.629456 9.214429 6
> > 19.629456 13.049429 6
> > 19.629456 13.049429 8.724564
> > 19.629456 13.049429 8.724564
> > 19.629456 13.049429 6
> > 19.454456 13.049429 6
> > 19.454456 13.049429 8.724564
> > 19.454456 13.049429 8.724564
> > 19.454456 13.049429 6
> > 19.454456 9.214429 6
> > 19.454456 9.214429 9.195417
> > 19.454456 9.214429 6
> > 19.454456 13.049429 6
> > 19.629456 13.049429 6
> > 19.629456 9.214429 6
> > 19.629456 9.214429 9.195417
> > 19.629456 13.049429 8.724564
> > 19.454456 13.049429 8.724564
> > 19.454456 9.214429 9.195417
> > 4 0 1 2 3
> > 4 4 5 6 7
> > 4 8 9 10 11
> > 4 12 13 14 15
> > 4 16 17 18 19
> > 4 20 21 22 23
> Hi Helmi,
>
> I am not sure about this, but while I understand that you want to
> create a cube with each face being defined as a square (unlike your
> previous OFF file, the new one can be successfully loaded to Meshlab,
> which means this is a valid OFF file), this causes your file to
> contain duplicate vertices. I am wondering if anybody can clarify
> whether Polyhedron_3 allows duplicate vertices?
>
> Also, if you receive any error message, it might be helpful to put it here.
>
> Best regards,
> Nicholas