[vtkusers] GetFieldData segfaults

[David Doria]

On Thu, Apr 23, 2009 at 12:58 PM, Berk Geveci <berk.geveci at kitware.com>wrote:

> Maybe the polydata pointer is invalid? Or maybe there is some issues
> with using smart pointers. Try this:
>
> vtkFieldData* FieldData = polydata->GetFieldData();
>
> where polydata is not a smart pointer.
>
> -berk
>

Berk,

It still crashed without using the smartpointer.

However, it stops crashing if I comment the following code (immediately
before the FieldData call):

        vtkSmartPointer<vtkPolyDataNormals> normalGenerator =
vtkSmartPointer<vtkPolyDataNormals>::New();
        normalGenerator->SetInput(polydata);
        normalGenerator->SetComputePointNormals(1);
        normalGenerator->SetComputeCellNormals(0);
        normalGenerator->SetSplitting(0);
        normalGenerator->Update();
        polydata = normalGenerator->GetOutput();

I tried it in a simplified example and the field data seemed to be intact
after this normal extraction, but in my "real" code the FieldData call is
causing a segmentation fault.

I put this
cerr << "Number of points after normal extraction: " <<
polydata->GetNumberOfPoints() << endl;

after the normalGenerator->GetOutput() and it shows the correct number of
points, so it seems like the polydata pointer is still valid.

Thanks,

David
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