### Author:  [@dhanushkannan](https://discourse.vtk.org/u/dhanushkannan)
#### Post date: [September 11, 2024, 11:56am UTC](https://discourse.vtk.org/t/setslice-function-in-vtkresliceimageviewer-is-not-properly-working/14559/1 "2024-09-11T11:56:23Z")
I am developing a Qt application using C++ to display the three dicom views and perform interaction between them.
I have displayed DICOM using vtkSmartPointer
> resliceImageViewer-\>SetSlice(100);
should set the dicom slice value to 100. Actually it does in backend, but in UI there is no change. The default slice is set at mid-value and is not changing in UI.
The following is my script
> ```
> resliceImageViewer[1] = vtkSmartPointer::New();
> resliceImageViewer[1]->GetRenderer()->AddViewProp ( cornerAnnotationCorL);
> ui->renderDockWidgetCoronal->SetRenderWindow(resliceImageViewer[1]->GetRenderWindow());
> resliceImageViewer[1]->SetupInteractor(ui->renderDockWidgetCoronal->GetRenderWindow()->GetInteractor());
>
> vtkResliceCursorLineRepresentation *rep = vtkResliceCursorLineRepresentation::SafeDownCast(
> resliceImageViewer[1]->GetResliceCursorWidget()->GetRepresentation());
> resliceImageViewer[1]->SetResliceCursor(resliceImageViewer[0]->GetResliceCursor());
>
> rep->GetResliceCursorActor()->
> GetCursorAlgorithm()->SetReslicePlaneNormal(1);
> resliceImageViewer[1]->SetInputData(reader->GetOutput());
> resliceImageViewer[1]->SetSliceOrientation(1);
> resliceImageViewer[1]->SetResliceModeToAxisAligned();
> resliceImageViewer[1]->SetResliceMode(1);
> resliceImageViewer[1]->GetRenderer()->ResetCamera();
> resliceImageViewer[1]->Render();
>
> ```
>
> corCam = vtkCamera::New();
> corCam-\>SetPosition(0, 0, 1);
> corCam-\>SetViewUp(0, -1, 0);
> corCam = resliceImageViewer[1]-\>GetRenderer()-\>GetActiveCamera();
> corCam-\>Roll(180);
> resliceImageViewer[1]-\>SetSliceOrientationToXZ();
> resliceImageViewer[1]-\>GetRenderer()-\>ResetCamera();
> resliceImageViewer[1]-\>Render();
>
> ```
> resliceImageViewer[1]->SetSlice(100); // this is not reflecting in UI
> resliceImageViewer[1]->GetRenderer()->ResetCamera();
> resliceImageViewer[1]->Render();
>
> ```
I couldn’t find any possible solution to this issue.
Help me out, guys.
---
### Author:  [@jaswantp](https://discourse.vtk.org/u/jaswantp)
#### Post date: [September 11, 2024, 12:10pm UTC](https://discourse.vtk.org/t/setslice-function-in-vtkresliceimageviewer-is-not-properly-working/14559/2 "2024-09-11T12:10:23Z")
> I am developing a Qt application using C++ to display the three dicom views and perform interaction between them.
Are you sure you have setup the VTK render window correctly with Qt? Normally one would use `QVTKOpenGLNativeWidget`. I think you need to assign that to `vtkResliceImageViewer`’s render window.
---
### Author:  [@dhanushkannan](https://discourse.vtk.org/u/dhanushkannan)
#### Post date: [September 11, 2024, 12:21pm UTC](https://discourse.vtk.org/t/setslice-function-in-vtkresliceimageviewer-is-not-properly-working/14559/3 "2024-09-11T12:21:17Z")
Yes, I have used QVTKWidget to render DICOM in UI.
If I use vtkSmartPointer instead of vtkresliceimageviewer, there is no issue.
But I need vtkResliceImageViewer, only then I can interact between all three views using vtkResliceCursorCallback.
---
### Author:  [@jaswantp](https://discourse.vtk.org/u/jaswantp)
#### Post date: [September 11, 2024, 12:25pm UTC](https://discourse.vtk.org/t/setslice-function-in-vtkresliceimageviewer-is-not-properly-working/14559/4 "2024-09-11T12:25:15Z")
> If I use vtkSmartPointer instead of vtkresliceimageviewer, there is no issue.
You mean `vtkSmartPointer` instead of `vtkResliceImageViewer*`? If that works, then use the smart pointer because it keeps the reslice image viewer instance alive. In the code you shared, it looks like you’re already using a smart pointer.
---
### Author:  [@dhanushkannan](https://discourse.vtk.org/u/dhanushkannan)
#### Post date: [September 11, 2024, 12:37pm UTC](https://discourse.vtk.org/t/setslice-function-in-vtkresliceimageviewer-is-not-properly-working/14559/5 "2024-09-11T12:37:59Z")
yes, i am using `vtkSmartPointer` instead of `vtkSmartPointer`