[vtkusers] Deleting "chunk of points" from Polydata

[Chiranjib Sur]

Hi All,
I want to delete some points from a polydata. Going through the user group
and various other discussion forum, I realised that there is no direct
utility to delete points from polydata. Using the VTk example page (
http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/DeletePoint) I am able to
delete vtkpoints from the polydata. The code snippet is here


  // polydata : defined earlier
  // vtkSmartPointer<vtkPolyData> polydata =
vtkSmartPointer<vtkPolyData>::New()

   vtkSmartPointer<vtkPoints> newPoints =
 vtkSmartPointer<vtkPoints>::New();
   vtkSmartPointer<vtkPolyData> newPolydata =
vtkSmartPointer<vtkPolyData>::New();
   newPolydata->SetPoints( newPoints );

  for(vtkIdType i = 0; i < polydata->GetNumberOfPoints(); i++)
     {
      if(i != 10 && i!=20 )     // deleting point 10 and 20
       {
        double p[3];
        polydata->GetPoint(i,p);
        newPoints->InsertNextPoint(p);
       }
     }

  polydata->ShallowCopy(newPolydata);


My question is :

If I want to delete a chunk of data, how do I go ? Checking each points in
the "if" condition is not the wise way of doing things I believe.

Is there any alternate solution ?

Thanks,
Chiranjib
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