[vtkusers] Re: yet another export format question

[Goodwin Lawlor]

Hi Florent,
What you want to do is not as straight forward as you may think... vtk's
polygons have to be converted to trimmed NURBS before they can be written
out in IGES format. This method is far from ideal and will result in massive
IGES files. I've used Autodesk's "Mechanical Desktop" to import stl files
from vtk and export IGES files which ansys could read. To get a model you
can work with though you might have to "slice" up your imported model and
recreate it by lofting a new surface over the slices. CAD packages weren't
design to work with thousands of trimmed NURBS surfaces...

What you really should do is "reverse-engineer" the polygonal mesh into a
parametric surface... have a look at www.geomagic.com- I imagine their
software is expensive though. I'm sure there's other software packages out
there too.

hth

Goodwin


<Florent.Chandelier at USherbrooke.ca> wrote in message
news:4151D782.5040504 at USherbrooke.ca...
> Ok .... mm quite embarassing ...
> The fact is that I wanna use the ANSYS soft  to implement finite
> elements ..... do you think an export to CATIA or SAT would be better or
> do I have to go through the writting of a new class ....
>
> flo
>
> Mathieu Malaterre wrote:
>
> > Florent,
> >
> >     Unfortunately this is an area where VTK lacks support. To my
> > knowledge there is no iges whatsoever in VTK.
> >
> >     Long time ago I tried a reader using opencascade:
> >
> > http://www.creatis.insa-lyon.fr/~malaterre/vtk/iges/
> >
> > Maybe it can give you a good start, but I would rather suggest you use
> > another file format to exange your data
> >
> > Mathieu
> >
> > Florent.Chandelier at USherbrooke.ca wrote:
> >
> >> hi all,
> >>
> >> so i'm able to export to STL format using triangle
> >> i've a polydata representaiton of  my 3D rendereing and I wanna
> >> export it to IGES ... could anyone point me on some good docs or even
> >> better codes !!!
> >>
> >> thx to all
> >>
> >> flo
> >>
> >> _______________________________________________
> >> This is the private VTK discussion list. Please keep messages
> >> on-topic. Check the FAQ at: <http://public.kitware.com/cgi-bin/vtkfaq>
> >> Follow this link to subscribe/unsubscribe:
> >> http://www.vtk.org/mailman/listinfo/vtkusers
> >>
> >
> >
> >
> >
>
> _______________________________________________
> This is the private VTK discussion list.
> Please keep messages on-topic. Check the FAQ at:
<http://public.kitware.com/cgi-bin/vtkfaq>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers
>