[vtkusers] boundary cells

[Gonzalo Amadio]

Hello, I am trying to extract boundary cells of a polydata. I've used
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Meshes/BoundaryEdges to extract
boundary edges.

Then I looked to this example :
http://public.kitware.com/cgi-bin/viewcvs.cgi/*checkout*/Graphics/Testing/Tcl/capSphere.tcl?root=VTK&content-type=text/plain
to extract the cells.

But when I print the result polydata data , gives me an error.

 vtkSmartPointer<vtkFeatureEdges> boundaryEdges =
> vtkSmartPointer<vtkFeatureEdges>::New();
> boundaryEdges->SetInput(myPolyData);
>  boundaryEdges->BoundaryEdgesOn();
> boundaryEdges->FeatureEdgesOff();
> boundaryEdges->ManifoldEdgesOff();
>  boundaryEdges->NonManifoldEdgesOff();
> boundaryEdges->Update();
>


vtkSmartPointer<vtkCleanPolyData> boundaryClean =
> vtkSmartPointer<vtkCleanPolyData>::New();
>  boundaryClean->SetInput(boundaryEdges->GetOutput());
>

> vtkSmartPointer<vtkStripper> boundaryStrips =
> vtkSmartPointer<vtkStripper>::New();
>  boundaryStrips->SetInput(boundaryClean->GetOutput());
> boundaryStrips->Update();
>


 vtkSmartPointer<vtkPolyData> boundaryPoly =
> vtkSmartPointer<vtkPolyData>::New();
> boundaryPoly->SetPoints((boundaryStrips->GetOutput())->GetPoints());
>  boundaryPoly->SetPolys((boundaryStrips->GetOutput())->GetLines());
>


vtkSmartPointer<vtkTriangleFilter> boundaryTriangles =
> vtkSmartPointer<vtkTriangleFilter>::New();
>  boundaryTriangles->SetInput(boundaryPoly);
>


vtkSmartPointer<vtkPolyData> boundaryTrianglesPD =
> boundaryTriangles->GetOutput();



 std::cout << "cell " << boundaryTrianglesPD->GetNumberOfCells() <<
> std::endl;                           // gives me 0
>  std::cout << "lines "
> << boundaryTrianglesPD->GetLines()->GetNumberOfCells() << std::endl;        //gives
> me 0
>  std::cout << "points "
> << boundaryTrianglesPD->GetPoints()->GetNumberOfPoints() << std::endl;  //
> crash here


Can someone help me?

Thank you!

-- 
--------
Gonzalo Amadio
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