[vtkusers] Extracting surface triangles (eliminating inner triangles)

[bailleul jonathan]

Thank you for your hint. Looking for the list designated me 
vtkGeometryFilter as the right filter, but I didn't manage to have it 
work. I should have noted that on my previous post...

So, my real question is: how to use this filter, since I'm stuck in 
understanding the documentation, even after having read some example code.

Here is the very simplistic code I used for my test:


int
main(int argc, char* argv[])
{
   usage(argc, argv);


   // create object geometry
   vtkPolyDataReader *reader = vtkPolyDataReader::New();
   reader -> SetFileName(argv[1]);
   reader -> Update();


   vtkGeometryFilter *geom = vtkGeometryFilter::New();
   geom -> SetInput(reader -> GetOutput());
   geom -> Update();


   vtkPolyDataWriter *writer = vtkPolyDataWriter::New();
   writer -> SetInput(geom -> GetOutput());
   writer -> SetFileName(argv[2]);
   writer -> SetFileTypeToASCII();
   writer -> Update();


   return EXIT_SUCCESS;
}



I'm sorry to put that topic on table once again, but I'm quite stuck on 
it for now...

In advance, thank you for any suggestion,




Tim Hutton wrote:
> Jonathan,
> 
> vtkGeometryFilter should do this for you, I think.
> 
> You may need to ensure that the vertices aren't split, and
> vtkCleanPolyData them if they are.
> 
> Tim
> 
> On 2/14/06, bailleul jonathan <jonathan.bailleul at utc.fr> wrote:
> 
>>Dear All,
>>
>>I know the topic is quite covered already, but I didn't manage to find
>>my solution in the list so far...
>>
>>I have a closed surface obtained from 3D delaunay (tetgen). It is
>>already a polydata made of triangles, but since it is infered from
>>tetrahedrons, there are many many inner triangles 'inside'.
>>
>>I would simply like to get rid of them, and only keep the
>>"boundary"/outer triangles.
>>
>>Please note that I neither don't want to add any vertices nor move the
>>existing "outer" vertices.
>>
>>
>>With my best regards,
>>
>>
>>
>>--
>>---------------------------------------
>>Jonathan BAILLEUL, ATER
>>Dept. Génie Biomédical - UTC Compiègne
>>Doctorant au GREYC Image - ENSICAEN
>>http://www.greyc.ensicaen.fr/~bailleul/
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> 
> 
> 
> --
> Tim Hutton - http://www.sq3.org.uk
> 
> Take the Organic Builder challenge -
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-- 
---------------------------------------
Jonathan BAILLEUL, ATER
Dept. Génie Biomédical - UTC Compiègne
Doctorant au GREYC Image - ENSICAEN
http://www.greyc.ensicaen.fr/~bailleul/