# How do I make reslice cursor orthogonal in MPR Scene???

**URL:** https://discourse.vtk.org/t/how-do-i-make-reslice-cursor-orthogonal-in-mpr-scene/10642
**Category:** Support
**Tags:** code
**Created:** [February 8, 2023, 11:39am UTC](https://discourse.vtk.org/t/how-do-i-make-reslice-cursor-orthogonal-in-mpr-scene/10642 "2023-02-08T11:39:00Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![kookoo9999](https://discourse.vtk.org/user_avatar/discourse.vtk.org/kookoo9999/32/3701_2.png) [@kookoo9999](https://discourse.vtk.org/u/kookoo9999)
#### Post date: [February 8, 2023, 11:39am UTC](https://discourse.vtk.org/t/how-do-i-make-reslice-cursor-orthogonal-in-mpr-scene/10642/1 "2023-02-08T11:39:00Z")

</div>

OS : win10  
vtk version : 8.0 with QT  
IDE : VisualStudio 2019(msvc v142) with QT 5.6

I want to be orthogonal each reslice cursor in MPR when I control( e.g rotate, ) a one axis like [this](https://discourse.vtk.org/t/vtkreslicecursorwidget-output-images-are-cropped/4244).

Why are there not maintain orthogonal each axis??

You can check my code below.

please tell me how to make orthogonal 2 axis in mpr scene…

> if (m\_bResliceCursor)  
> {  
> C\_VTK(vtkCellPicker, picker);  
> picker-\>SetTolerance(0.005);
> 
> ```
> C_VTK(vtkProperty, ipwProp);
> //vtkSP<vtkImagePlaneWidget> ipw[3];
> 
> int dims[3];
> volumeData->GetImageData()->GetDimensions(dims);
> 
> //vtkSP<vtkImagePlaneWidget> ipw[3];
> 
> // Image Plane Widget set
> for (int i = VIEW_AXIAL; i <= VIEW_SAGITTAL; i++)
> {
> m_ipw[i] = vtkSP<vtkImagePlaneWidget>::New();
> m_ipw[i]->SetInteractor(GetMprInteractor(i)->GetInteractor());
> m_ipw[i]->SetPicker(picker);
> m_ipw[i]->RestrictPlaneToVolumeOn();
> 
> double color[3] = { 0,0,0 };
> color[i] = 1;
> 
> m_ipw[i]->GetPlaneProperty()->SetColor(color);
> m_ipw[i]->SetTexturePlaneProperty(ipwProp);
> m_ipw[i]->TextureInterpolateOff();
> m_ipw[i]->SetResliceInterpolateToLinear();
> m_ipw[i]->SetInputData(volumeData->GetImageData());
> m_ipw[i]->SetSliceIndex(dims[i] / 2);
> m_ipw[i]->DisplayTextOn();
> m_ipw[i]->SetDefaultRenderer(GetRenderer(VIEW_3D));
> m_ipw[i]->SetWindowLevel(1358, -27);
> m_ipw[i]->On();
> m_ipw[i]->InteractionOn();
> }
>   
> m_ipw[1]->SetLookupTable(m_ipw[0]->GetLookupTable());
> m_ipw[2]->SetLookupTable(m_ipw[0]->GetLookupTable());
> 
> C_VTK(vtkResliceCursorCallback, cbk);
> cbk->m_pRen = GetRenderer(VIEW_3D);
> 
> //C_VTK(vtkResliceCursor, resliceCursor);
> 
> m_resliceCursor->SetCenter(volumeData->GetImageData()->GetCenter());
> m_resliceCursor->SetThickMode(0);
> m_resliceCursor->SetThickness(10, 10, 10);
> m_resliceCursor->SetImage(volumeData->GetImageData());
>   
> /*vtkSP<vtkResliceCursorWidget> rcw[3];
> vtkSP<vtkResliceCursorLineRepresentation> rep[3];*/
> 
> double viewUp[3][3] = { {0,0,-1},{0,0,1},{0,1,0} };
> for (int i = 0; i < 3; i++)
> {
> //m_rcw[i] = vtkSP<vtkResliceCursorWidget>::New();
> m_rcw[i]->SetInteractor(GetVtkWindow(i)->GetInteractor());
>   	
> //m_rep[i] = vtkSP<vtkResliceCursorLineRepresentation>::New();
> m_rcw[i]->SetRepresentation(m_rep[i]);
> m_rep[i]->GetResliceCursorActor()->GetCursorAlgorithm()->SetResliceCursor(m_resliceCursor);
> m_rep[i]->GetResliceCursorActor()->GetCursorAlgorithm()->SetReslicePlaneNormal(i);
>   	
> const double minVal = volumeData->GetImageData()->GetScalarRange()[0];
> 
> if (vtkImageReslice* reslice = vtkImageReslice::SafeDownCast(m_rep[i]->GetReslice()))
> {
> reslice->SetBackgroundColor(minVal, minVal, minVal, minVal);
> }
> 
> m_rcw[i]->SetDefaultRenderer(GetRenderer(i));
> m_rcw[i]->SetEnabled(true);
> GetRenderer(i)->GetActiveCamera()->SetFocalPoint(0,0,0);
> GetRenderer(i)->GetActiveCamera()->ParallelProjectionOn();
> GetRenderer(i)->GetActiveCamera()->SetViewUp(viewUp[i][0], viewUp[i][1], viewUp[i][2]);
> GetRenderer(i)->GetActiveCamera()->Zoom(1.5);
> GetRenderer(i)->ResetCamera();
> 
> cbk->IPW[i] = m_ipw[i];
> cbk->RCW[i] = m_rcw[i];
> 
> m_rcw[i]->AddObserver(vtkResliceCursorWidget::ResliceAxesChangedEvent, cbk);
> m_rcw[i]->AddObserver(
> vtkResliceCursorWidget::ResliceAxesChangedEvent, cbk);
> m_rcw[i]->AddObserver(
> vtkResliceCursorWidget::WindowLevelEvent, cbk);
> m_rcw[i]->AddObserver(
> vtkResliceCursorWidget::ResliceThicknessChangedEvent, cbk);
> m_rcw[i]->AddObserver(
> vtkResliceCursorWidget::ResetCursorEvent, cbk);
> m_rcw[i]->AddObserver(
> vtkCommand::WindowLevelEvent, cbk);
>   	
> 
> double range[2];
> volumeData->GetImageData()->GetScalarRange(range);
> m_rep[i]->SetWindowLevel(range[1] - range[0], (range[0] + range[1]) / 2.0);
> m_ipw[i]->SetWindowLevel(range[1] - range[0], (range[0] + range[1]) / 2.0);
> m_rep[i]->SetLookupTable(m_rep[0]->GetLookupTable());
> m_ipw[i]->GetColorMap()->SetLookupTable(m_rep[0]->GetLookupTable());
>   	
> }
> 
> ```
> 
> }

> class vtkResliceCursorCallback : public vtkCommand  
> {  
> public:  
> static vtkResliceCursorCallback \* New()  
> {
> 
> ```
> return new vtkResliceCursorCallback;
> 
> ```
> 
> }
> 
> void Execute(vtkObject \* caller, unsigned long event, void\* callData) override  
> {  
> if (vtkResliceCursorWidget::WindowLevelEvent == event ||  
> vtkCommand::WindowLevelEvent == event ||  
> vtkResliceCursorWidget::ResliceThicknessChangedEvent == event)  
> {  
> for (int i = 0; i \< 3; i++)  
> {  
> this-\>RCW[i]-\>Render();   
> if(nullptr == m\_pRen) m\_pRen-\>Render();  
> }  
> this-\>IPW[0]-\>GetInteractor()-\>GetRenderWindow()-\>Render();   
> return;  
> }
> 
> ```
> vtkImagePlaneWidget * ipw = dynamic_cast<vtkImagePlaneWidget*>(caller);
> if (ipw)
> {
> double* wl = static_cast<double*>(callData);
> 
> if (ipw == this->IPW[0])
> {
> this->IPW[1]->SetWindowLevel(wl[0], wl[1], 1);
> this->IPW[2]->SetWindowLevel(wl[0], wl[1], 1);
> }
> else if (ipw == this->IPW[1])
> {
> this->IPW[0]->SetWindowLevel(wl[0], wl[1], 1);
> this->IPW[2]->SetWindowLevel(wl[0], wl[1], 1);
> }
> else if (ipw == this->IPW[2])
> {
> this->IPW[0]->SetWindowLevel(wl[0], wl[1], 1);
> this->IPW[1]->SetWindowLevel(wl[0], wl[1], 1);
> }
> }
> vtkResliceCursorWidget * rcw = dynamic_cast<vtkResliceCursorWidget*>(caller);
> if (rcw)
> {
> vtkResliceCursorLineRepresentation * rep = 
> dynamic_cast<vtkResliceCursorLineRepresentation*>(rcw->GetRepresentation());
> 
> //vtkResliceCursor* rc = rep->GetResliceCursorActor()->GetCursorAlgorithm()->GetResliceCursor();
>   		
> 
> rep->GetResliceCursorActor()->GetCursorAlgorithm()->GetResliceCursor();
> for (int i = 0; i < 3; i++)
> {
> vtkPlaneSource* ps = static_cast<vtkPlaneSource*>(this->IPW[i]->GetPolyDataAlgorithm());
> ps->SetOrigin(
> this->RCW[i]->GetResliceCursorRepresentation()->GetPlaneSource()->GetOrigin());
> ps->SetPoint1(
> this->RCW[i]->GetResliceCursorRepresentation()->GetPlaneSource()->GetPoint1());
> ps->SetPoint2(
> this->RCW[i]->GetResliceCursorRepresentation()->GetPlaneSource()->GetPoint2());
>   			
> /*vtkPlaneSource * ps = static_cast<vtkPlaneSource*>(this->IPW[i]->GetPolyDataAlgorithm());
> ps->SetNormal(rc->GetPlane(i)->GetNormal());
> ps->SetCenter(rc->GetPlane(i)->GetOrigin());*/
>   			
> 
> this->IPW[i]->UpdatePlacement();
> }
> }
> 
> for (int i = 0; i < 3; i++)
> {
> this->RCW[i]->Render();
> if (nullptr == m_pRen) m_pRen->Render();
> }
> this->IPW[0]->GetInteractor()->GetRenderWindow()->Render();        
> if (nullptr == m_pRen) m_pRen->Render();
>   	
> }
> 
> ```
> 
> vtkResliceCursorCallback() {}  
> vtkImagePlaneWidget \* IPW[3];  
> vtkResliceCursorWidget \* RCW[3];
> 
> // 3d renderer  
> vtkRenderer\* m\_pRen;  
> };

---

<div class="post-metadata">

### Author: ![kookoo9999](https://discourse.vtk.org/user_avatar/discourse.vtk.org/kookoo9999/32/3701_2.png) [@kookoo9999](https://discourse.vtk.org/u/kookoo9999)
#### Post date: [February 9, 2023, 12:37am UTC](https://discourse.vtk.org/t/how-do-i-make-reslice-cursor-orthogonal-in-mpr-scene/10642/2 "2023-02-09T00:37:25Z")

</div>

I found that it is operating when I press mouse left button with ctrl key.  
then I want to default set as pressing ctrl key even if I don’t press ctrl key.  
the thing that i want is setting a defulat by orthogonal when I drag one axis in MPR , two axis is maintaining orthogonal.  
How can I do?? Tell me know how can I set.

I checked option which can set a orthogonal [here](https://kitware.github.io/vtk-js/examples/ResliceCursorWidget.html).

 ![image](https://discourse.vtk.org/uploads/default/original/2X/c/cb925092a8341d9608048ec1254d8ea728b83f57.png)

but I can’t find ResliceCursorWidgetState and set “keep orthogonal” like below photo.

 ![image](https://discourse.vtk.org/uploads/default/original/2X/c/c822bbfa9af7b59265749737e6262eb758efbadb.png)

---

<div class="post-metadata">

### Author: ![JunyiPan](https://discourse.vtk.org/user_avatar/discourse.vtk.org/junyipan/32/8100_2.png) [@JunyiPan](https://discourse.vtk.org/u/JunyiPan)
#### Post date: [December 5, 2023, 8:16am UTC](https://discourse.vtk.org/t/how-do-i-make-reslice-cursor-orthogonal-in-mpr-scene/10642/3 "2023-12-05T08:16:29Z")

</div>

Hi, did you solve it yet? I got the same problem