[vtkusers] CellData null pointer?

[David Doria]

n Mon, May 14, 2012 at 2:05 PM, Brett Tully <brett.tully at oxyntix.com> wrote:
> I have been staring at this for a while and could be making a really dumb
> error, but can anyone explain why the last line segfaults please...? I am
> guessing that I need to initialise something?
>
>     vtkSmartPointer<vtkImageData> imageData
> = vtkSmartPointer<vtkImageData>::New();
>     imageData->SetExtent(0, 10, 0, 10, 0, 0);
>     imageData->SetOrigin(0.0, 0.0, 0.0);
>     imageData->SetSpacing(0.1, 0.1, 0.0);
>     imageData->SetScalarTypeToDouble();
>     vtkSmartPointer<vtkCellData> cellData = imageData->GetCellData();
>     cout << cellData->GetNumberOfArrays() << endl;
>
> Thanks,
> Brett.

Try imageData->Allocate() before the GetCellData() call.

David