[vtkusers] volume mapper error

[Franks]

Hi,
I want to test the volume mapper. I read the data from .vtk file and change
its points attributes(vtkUnsignedCharArray with one component) to the
vtkFloatArray with two components. Then I volume render it. But I get the
"Segmentation fault". 

 auto reader = vtkSmartPointer<vtkStructuredPointsReader>::New();
    reader->SetFileName("../mummy.128.vtk");
    reader->Update();

    auto tuples = vtkSmartPointer<vtkFloatArray>::New();
    tuples->DeepCopy(reader->GetOutput()->GetPointData()->GetScalars());
    tuples->SetNumberOfComponents(2);
    for (int i = 0; i < tuples->GetNumberOfTuples(); ++i) {
        tuples->SetTuple2(i,80,80);
    }

    reader->GetOutput()->GetPointData()->RemoveArray(0);
    reader->GetOutput()->GetPointData()->SetScalars(tuples);

    auto volumeMapper = vtkSmartPointer<vtkSmartVolumeMapper>::New();
    volumeMapper->SetInputConnection(reader->GetOutputPort());

    auto volumeProperty = vtkSmartPointer<vtkVolumeProperty>::New();

    auto compositeOpacity = vtkSmartPointer<vtkPiecewiseFunction>::New();
    compositeOpacity->AddPoint(40, 0.00);
    compositeOpacity->AddPoint(60, 0.40);
    volumeProperty->SetScalarOpacity(compositeOpacity);

    auto color = vtkSmartPointer<vtkColorTransferFunction>::New();
    color->AddRGBPoint(0.000, 0.00, 0.00, 0.00);
    color->AddRGBPoint(64.00, 1.00, 0.52, 0.30);
    volumeProperty->SetColor(color);

    auto volume = vtkSmartPointer<vtkVolume>::New();
    volume->SetMapper(volumeMapper);
    volume->SetProperty(volumeProperty);

    auto ren = vtkSmartPointer<vtkRenderer>::New();
    ren->AddVolume(volume);
    ren->SetBackground(1, 1, 1);

    auto renWin = vtkSmartPointer<vtkRenderWindow>::New();
    renWin->AddRenderer(ren);

    auto style = vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();
    auto iren = vtkSmartPointer<vtkRenderWindowInteractor>::New();
    iren->SetRenderWindow(renWin);
    iren->SetInteractorStyle(style);

    iren->Initialize();
    iren->Start();

Best regards
Frank



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