# vtkImagePlaneWidget and vtkImageReslice on vtkGenericOpenGLRenderWindow

**URL:** https://discourse.vtk.org/t/vtkimageplanewidget-and-vtkimagereslice-on-vtkgenericopenglrenderwindow/12721
**Category:** Development
**Tags:** code
**Created:** [November 16, 2023, 5:59am UTC](https://discourse.vtk.org/t/vtkimageplanewidget-and-vtkimagereslice-on-vtkgenericopenglrenderwindow/12721 "2023-11-16T05:59:35Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![mdeepakcdac](https://discourse.vtk.org/user_avatar/discourse.vtk.org/mdeepakcdac/32/8720_2.png) [@mdeepakcdac](https://discourse.vtk.org/u/mdeepakcdac)
#### Post date: [November 16, 2023, 5:59am UTC](https://discourse.vtk.org/t/vtkimageplanewidget-and-vtkimagereslice-on-vtkgenericopenglrenderwindow/12721/1 "2023-11-16T05:59:36Z")

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Hai everyone,

I’ve incorporated a DICOM series into vtkMarchingCubes and subsequently added it to the renderer as an actor. This renderer was then placed into the vtkGenericOpenGLRenderWindow. Following that, I added a vtkImagePlaneWidget to the same renderer. I’m attempting to move this PlaneWidget and obtain the current vtkImageReslice, displaying that slice in another renderer.This second renderer was then placed into the vtkGenericOpenGLRenderWindow. Unfortunately, when I add an interactor to the render window, the application crashes. I need to move the PlaneWidget, but without adding the interactor, the widget remains immobile. How can I resolve this issue? Code given below

```auto
 m_qobjVTKOpenGLWidget = new QVTKOpenGLWidget();
    m_qobjVTKOpenGLWidget->SetRenderWindow(m_objvtkGenericOpenGLRenderWindow);

    QString folderPath = QDir::currentPath() + "/TwinFetuses_dicom";

    vtkSmartPointer<vtkNamedColors> colors = vtkSmartPointer<vtkNamedColors>::New();

    vtkSmartPointer<vtkImageData> volume = vtkSmartPointer<vtkImageData>::New();
    double isoValue;

    vtkSmartPointer<vtkDICOMImageReader> reader = vtkSmartPointer<vtkDICOMImageReader>::New();
    reader->SetDirectoryName(folderPath.toUtf8().constData());
    reader->Update();
    volume->DeepCopy(reader->GetOutput());

    vtkSmartPointer<vtkMarchingCubes> surface = vtkSmartPointer<vtkMarchingCubes>::New();
    surface->SetInputData(volume);
    surface->ComputeNormalsOn();
    surface->SetValue(0, 75);

    vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetInputConnection(surface->GetOutputPort());
    mapper->ScalarVisibilityOff();

    vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);
    actor->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());

    renderer = vtkSmartPointer<vtkRenderer>::New();
    renderer->SetBackground(colors->GetColor3d("DarkSlateGray").GetData());

    renderer->AddActor(actor);
    renderer->SetViewport(0,0,0.5,1 );
     m_qobjVTKOpenGLWidget->GetRenderWindow()->AddRenderer(renderer);

    vtkSmartPointer<vtkImagePlaneWidget> m_objvtkImagePlaneWidget = vtkSmartPointer<vtkImagePlaneWidget>::New();
    m_objvtkImagePlaneWidget->SetInputConnection(reader->GetOutputPort());

    m_objvtkImagePlaneWidget->SetPlaneOrientationToXAxes();
    m_objvtkImagePlaneWidget->SetSliceIndex(100);
    m_objvtkImagePlaneWidget->DisplayTextOn();
    m_objvtkImagePlaneWidget->SetInteractor(m_objvtkGenericOpenGLRenderWindow->GetInteractor());
    m_objvtkImagePlaneWidget->SetDefaultRenderer(renderer);
    m_objvtkImagePlaneWidget->RestrictPlaneToVolumeOn();
    m_objvtkImagePlaneWidget->GetPlaneProperty()->SetColor(1,0,0);
    m_objvtkImagePlaneWidget->TextureInterpolateOff();
    m_objvtkImagePlaneWidget->SetResliceInterpolateToLinear();
    m_objvtkImagePlaneWidget->GetPlaneProperty()->SetLineWidth(2.5);
    m_objvtkImagePlaneWidget->GetTexturePlaneProperty()->SetOpacity(0.01);
    m_objvtkImagePlaneWidget->UpdatePlacement();
    m_objvtkImagePlaneWidget->On();

    m_objvtkImagePlaneWidget->AddObserver(vtkCommand::InteractionEvent,this, &showScannedOut::FovPlaneCallbackPoint);

    vtkSmartPointer<vtkImageReslice> reslice = vtkSmartPointer<vtkImageReslice>::New();
    reslice->SetInputData(m_objvtkImagePlaneWidget->GetInput());
    reslice->Update();
    vtkSmartPointer<vtkImageSliceMapper> map = vtkSmartPointer<vtkImageSliceMapper>::New();
    map->SetInputConnection(reslice->GetOutputPort());
    map->SetOrientation(2);
    map->Update();
    vtkSmartPointer<vtkImageSlice> imageActor = vtkSmartPointer<vtkImageSlice>::New();
    imageActor->SetMapper(map);

    renderertwoD = vtkSmartPointer<vtkRenderer>::New();
    renderertwoD->SetBackground(colors->GetColor3d("AliceBlue").GetData());
    renderertwoD->SetViewport(0.5,0,1,1 );
    renderertwoD->AddViewProp(imageActor);
    renderer->ResetCamera();
    renderer->SetBackground(colors->GetColor3d("NavajoWhite").GetData());
    m_objvtkGenericOpenGLRenderWindow->AddRenderer(renderertwoD);
    QHBoxLayout *lay= new QHBoxLayout;
    lay->addWidget(m_qobjVTKOpenGLWidget);
    this->setLayout(lay);
   m_objvtkGenericOpenGLRenderWindow->Render();

```

Kindly help me to sort out this probem. Thank in advance.

Deepak

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<div class="post-metadata">

### Author: ![ben.boeckel](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/b/ea5d25/32.png) [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)
#### Post date: [November 17, 2023, 4:33am UTC](https://discourse.vtk.org/t/vtkimageplanewidget-and-vtkimagereslice-on-vtkgenericopenglrenderwindow/12721/2 "2023-11-17T04:33:28Z")

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Can you get a backtrace of where the crash happens?

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<div class="post-metadata">

### Author: ![cory.quammen](https://discourse.vtk.org/user_avatar/discourse.vtk.org/cory.quammen/32/6751_2.png) [@cory.quammen](https://discourse.vtk.org/u/cory.quammen)
#### Post date: [November 21, 2023, 12:51am UTC](https://discourse.vtk.org/t/vtkimageplanewidget-and-vtkimagereslice-on-vtkgenericopenglrenderwindow/12721/3 "2023-11-21T00:51:55Z")

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Do you have a specific reason to use `vtkGenericOpenGLRenderWindow` rather than simply a `vtkRenderWindow`? Do you need to use an OpenGL context created outside VTK, for example?