[vtkusers] PLASE HELP: QVTKInteractor Not Working

[John Eke]

Hi,

I am trying to create a Qt application with a QVTKWidget in there. I 
have a piece of code I have written in pure VTK + ITK, using 
vtkInteractorStyleImage on a vtkRenderWindpowInteractor, and all goes 
well. For some reason, when I move this code over to the QVTKWidget 
(making necessary changes), the app loads, but when I try to use the 
interactor, a segmentation fault error occurs and the application dies.

Heres a code snippet:

    m_pImageActor = vtkImageActor::New();
    m_pRenderer = vtkRenderer::New();
    m_pInteractor = qvtkwidget->GetInteractor();
   
    vtkInteractorStyleImage* pIStyle = vtkInteractorStyleImage::New();
    m_pInteractor->SetInteractorStyle(pIStyle);
    pIStyle->Delete();
   
    GetRenderWindow()->AddRenderer(m_pRenderer);   
    m_pRenderer->AddActor(m_pImageActor);

    m_pImageActor->SetInput(connector->GetOutput());
    qvtkwidget->GetRenderWindow()->Render();

heres the callstack from the debugger:

Thread [1] (Suspended: Signal 'SIGSEGV' received. Description: 
Segmentation fault.)   
    45 <symbol is not available> 0x0000004b   
    44 vtkImageImport::InvokeUpdateInformationCallbacks()  0xb62f4f15   
    43 vtkImageImportExecutive::ProcessRequest()  0xb62fc4d2   
    42 vtkDemandDrivenPipeline::UpdateInformation()  0xb5f56661   
    41 vtkDataObject::UpdateInformation()  0xb5f40480   
    40 vtkImageData::UpdateInformation()  0xb5f9e39f   
    39 vtkImageActor::GetDisplayBounds()  0xb71d7c25   
    38 vtkImageActor::GetBounds()  0xb71d86aa   
    37 vtkFrustumCoverageCuller::Cull()  0xb71c96a6   
    36 vtkRenderer::AllocateTime()  0xb724f5f9   
    35 vtkRenderer::Render()  0xb7250986   
    34 vtkRendererCollection::Render()  0xb7257424   
    33 vtkRenderWindow::DoStereoRender()  0xb7240b9c   
    32 vtkRenderWindow::DoFDRender()  0xb7241029   
    31 vtkRenderWindow::DoAARender()  0xb724160e   
    30 vtkRenderWindow::Render()  0xb7241ce3   
    29 vtkXOpenGLRenderWindow::Render()  0xb72d7b2a   
    28 vtkRenderWindowInteractor::Render()  0xb724b8ec   
    27 vtkInteractorStyle::StopState()  0xb71ec4b2   
    26 vtkInteractorStyleImage::EndWindowLevel()  0xb71f353d   
    25 vtkInteractorStyleImage::OnLeftButtonUp()  0xb71f3913   
    24 vtkInteractorStyle::ProcessEvents()  0xb71eaee4   
    23 vtkCallbackCommand::Execute()  0xb659c046   
    22 vtkSubjectHelper::InvokeEvent()  0xb662c30f   
    21 vtkObject::InvokeEvent()  0xb662c407   
    20 QVTKWidget::mouseReleaseEvent()  0xb7ed69ef   
    19 QVTKCameraView::mouseReleaseEvent()  0x08154bb4   
    18 QWidget::event()  0xb791dfbd   
    17 QVTKWidget::event()  0xb7ed7c5c   
    16 QApplicationPrivate::notify_helper()  0xb78d428d   
    15 QApplication::notify()  0xb78d84f1   
    14 QCoreApplication::notifyInternal()  0xb753ec1b   
    13 <symbol is not available> 0xb7930b4a   
    12 QApplication::x11ProcessEvent()  0xb7930197   
    11 <symbol is not available> 0xb7955684   
    10 g_main_context_dispatch()  0xb55c1bf8   
    9 <symbol is not available> 0xb55c4e5e   
    8 g_main_context_iteration()  0xb55c53ac   
    7 QEventDispatcherGlib::processEvents()  0xb7562f82   
    6 <symbol is not available> 0xb7955475   
    5 QEventLoop::processEvents()  0xb753dfb2   
    4 QEventLoop::exec()  0xb753e0bc   
    3 QCoreApplication::exec()  0xb754088a   
    2 QApplication::exec()  0xb78d36e7   
    1 main()  0x081b0cf2   

ANY kind of help is greatly appreciated.

Thanks

John E