[vtkusers] VTK contour Widget

[Andras Lasso]

Hello Iyas,

There are many VTK-based applications that allow contouring on image slices. I would recommend to extend/modify these applications to suit your needs, instead of reimplementing everything from scratch. If you just want to implement this as a learning experience, then you can check out the source code of these existing applications, you can learn a lot about how to implement this and many other features.

For example:
www.slicer.org<http://www.slicer.org>
www.itksnap.org<http://www.itksnap.org>
www.mitk.org<http://www.mitk.org>

Andras

From: vtkusers [mailto:vtkusers-bounces at vtk.org] On Behalf Of Iyas Hamdan
Sent: Friday, August 25, 2017 9:51 AM
To: VTK Users <vtkusers at vtk.org>
Subject: [vtkusers] VTK contour Widget

Hello,
I have a problem using the vtkcontourwidget in 3D. What I'm trying to do is to draw contours on my 3D image, where a different contour can be drawn on each slice of the image.
The problem that I'm getting is that when I draw a contour on one of the slices, the same contour appears on all the other slices as well.

Here's a piece of the code i'm using:

    vtkSmartPointer<vtkImageViewer2> ImageViewer = vtkSmartPointer<vtkImageViewer2>::New();
    ImageViewer->SetInputData(reader->GetOutput());
    ImageViewer->SetColorLevel(127);
    ImageViewer->SetColorWindow(255);

    vtkSmartPointer<vtkRenderWindowInteractor> iren = vtkSmartPointer<vtkRenderWindowInteractor>::New();
    ImageViewer->SetupInteractor(iren);
    ImageViewer->Render();
    ImageViewer->GetRenderer()->ResetCamera();
    ImageViewer->Render();

    vtkSmartPointer<vtkSliderWidget> SliderWidget = vtkSmartPointer<vtkSliderWidget>::New();
    SliderWidget->SetInteractor(iren);
    SliderWidget->SetRepresentation(SliderRepres2D);
    SliderWidget->KeyPressActivationOff();
    SliderWidget->SetAnimationModeToAnimate();
    SliderWidget->SetEnabled(true);

    vtkSmartPointer<vtkSliderCallback> SliderCb = vtkSmartPointer<vtkSliderCallback>::New();
    SliderCb->SetImageViewer(ImageViewer);
    SliderWidget->AddObserver(vtkCommand::InteractionEvent, SliderCb);

    ImageViewer->SetSlice(static_cast<int>(SliderRepres2D->GetValue()));

vtkSmartPointer<vtkContourWidget> ContourWidget = vtkSmartPointer<vtkContourWidget>::New();
    vtkSmartPointer<vtkOrientedGlyphContourRepresentation> rep = vtkSmartPointer<vtkOrientedGlyphContourRepresentation>::New();
    ContourWidget->SetRepresentation(rep);

    vtkSmartPointer<vtkImageActorPointPlacer>  imageActorPointPlacer = vtkSmartPointer<vtkImageActorPointPlacer>::New();
    imageActorPointPlacer->SetImageActor(ImageViewer->GetImageActor());
    rep->SetPointPlacer(imageActorPointPlacer);
    rep->GetProperty()->SetColor(0, 1, 0);

    ContourWidget->SetInteractor(iren);
    ContourWidget->FollowCursorOn();
    ContourWidget->SetEnabled(true);
    ContourWidget->ProcessEventsOn();

    iren->Start();

Any idea what's causing this problem and eventually how to fix it ?
Any help would be really appreciated,
Thanks in advance,
Iyas
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