Add: [vtkusers] vtkExtractEdges only 2D, how to do a projection ?

[Sebastien_MARAUX]

I tried vtkExtractEdges with a polydata and output 
was 0 lines 0 points 0 polys.

here is a snippet of my code:

//-----------------------------------------------------------------------------------------------------------------------------------
  cout <<polyData->GetNumberOfPoints() <<" / "    // result : 25000 /
        <<polyData->GetNumberOfLines() <<" / "       // result : 0 /
        <<polyData->GetNumberOfPolys() <<endl;     // result : 127

  vtkFeatureEdges *edgeExtracter = vtkFeatureEdges::New();
  edgeExtracter->SetInput(polyData);

  cout <<edgeExtracter->GetOutput()->GetNumberOfPoints() <<" / "  // result : 0 /
         <<edgeExtracter->GetOutput()->GetNumberOfLines() <<" / "    // result : 0 /
         <<edgeExtracter->GetOutput()->GetNumberOfPolys() <<endl;  // result : 0
//---------------------------------------------------------------------------------------------------------------------------------------
  ----- Original Message ----- 
  From: Sebastien_MARAUX 
  To: vtk mailing list 
  Sent: Monday, July 01, 2002 3:47 PM
  Subject: [vtkusers] vtkExtractEdges only 2D, how to do a projection ?


  I needto use vtkExtractEdges on a polydata 
  containing 3D data.

  How can I make a simple projection of my data in
  xz plane  to obtain a 2D polyData ?

  I assume there is a smarter way than
  creating a 2D polydata and insert each
  point as (x,z) couple, and then copy each cell.

  Sebastien MARAUX
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