[vtkusers] Qt & VTK Intereaction problem

[al.gry]

Hi all,
I'm new to VTK and Qt. Now to my problem, I'm trying to visualize 3d volume
from dicom files  using vtk in qt. So far it goes fine but I cannot rotate
the scene or do other interactions except zooming. If I use the same code
without Qt everything works. I searched in the mailing list and found some
hints but nothing I can work with. 

m_pRenWin = vtkSmartPointer<vtkRenderWindow>::New();
  m_pQVTKWidget->SetRenderWindow(m_pRenWin);
  m_pIren = vtkSmartPointer<vtkRenderWindowInteractor>::New();
  m_pIren->SetRenderWindow(m_pQVTKWidget->GetRenderWindow());
  m_pRen = vtkSmartPointer<vtkRenderer>::New();
  m_pQVTKWidget->GetRenderWindow()->AddRenderer(m_pRen);

vtkSmartPointer<vtkAlgorithm> m_reader = 
vtkSmartPointer<vtkAlgorithm>::New();
 m_reader = m_pDicomReader;
    vtkSmartPointer<vtkImageData> input =
vtkSmartPointer<vtkImageData>::New();
    input = m_pDicomReader->GetOutput();

    int dim[3];
    input->GetDimensions(dim);
    if( (dim[0] < 2)||(dim[1] < 2)||(dim[2] < 2))
    {
      QMessageBox::information(this, tr("Error"), tr("Wrong dimension!"));
      return;
    }

    // Create our volume and mapper
    vtkSmartPointer<vtkVolume> volume = vtkSmartPointer<vtkVolume>::New();
    vtkSmartPointer<vtkFixedPointVolumeRayCastMapper> mapper =
vtkSmartPointer<vtkFixedPointVolumeRayCastMapper>::New();

    mapper->SetInputConnection( m_reader->GetOutputPort() );

    double spacing[3];
    input->GetSpacing(spacing);

    vtkSmartPointer<vtkColorTransferFunction> colorFun =
vtkSmartPointer<vtkColorTransferFunction>::New();
    vtkSmartPointer<vtkPiecewiseFunction> opacityFun =
vtkSmartPointer<vtkPiecewiseFunction>::New();

    vtkSmartPointer<vtkVolumeProperty> property =
vtkSmartPointer<vtkVolumeProperty>::New();
    bool independentComponents=true;
    property->SetIndependentComponents(independentComponents);
    property->SetColor( colorFun );
    property->SetScalarOpacity( opacityFun );
    property->SetInterpolationTypeToLinear();

    // connect up the volume to the property and the mapper
    volume->SetProperty( property );
    volume->SetMapper( mapper );

    double opacityWindow = 4096.0;
    double opacityLevel = 2048.0;

    colorFun->AddRGBSegment(0.0, 1.0, 1.0, 1.0, 255.0, 1.0, 1.0, 1.0 );
    opacityFun->AddSegment( opacityLevel - 0.5*opacityWindow, 0.0,
opacityLevel + 0.5*opacityWindow, 1.0 );
    mapper->SetBlendModeToMaximumIntensity();    

    m_pIren = vtkSmartPointer<vtkRenderWindowInteractor>::New();
    m_pIren->SetRenderWindow(m_pQVTKWidget->GetRenderWindow());
    m_pIren->GetInteractorStyle()->SetDefaultRenderer(m_pRen);

    //m_pQVTKWidget->GetRenderWindow()->Render();
    m_pRen->AddVolume(volume);
    m_pRen->ResetCamera();
    m_pRen->Modified();

    m_pQVTKWidget->GetRenderWindow()->Render();


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