[vtkusers] vtkImageSlice and vtkImageReslice Mapper

[Sahithya Wintrich]

I'm using im->SetSlicePlane() with a vtkPlane. That eliminated the volume
visualization. However, I am still able to rotate the slice while holding
the left mouse button down and dragging.

Sahithya


On Fri, Nov 9, 2012 at 5:24 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> Then what happens if you comment out the im.SliceAtFocalPointOn()
> line in the code?  Then the camera will control the slice orientation,
> but not the slice, which would instead be controlled by calling
> im.GetSlicePlane()->SetOrigin(x,y,z) where (x,y,z) is a point on
> the slice that you want to display.
>
>  - David
>
> On Fri, Nov 9, 2012 at 2:53 PM, Sahithya Wintrich <s.prakash at csuohio.edu>
> wrote:
> > I want to select points and add a connecting line through the points on
> the
> > axial slice. Adding an mouse interaction to the modified code from
> > VTK/ImageProcessing/Python/ImageInteractorReslice.py causes the axial
> slice
> > not be "static" anymore. Meaning if I hold down the left mouse button and
> > drag my mouse around the mouse pad, I am able to visualize the remaining
> > volume. I would like to prevent this from happening. Is there are
> workaround
> > to this? (my code below)
> >
> > class Interaction: public vtkInteractorStyleTrackballCamera
> > {
> >   public:
> >     static Interaction* New();
> >     vtkTypeMacro(Interaction, vtkInteractorStyleTrackballCamera);
> >
> >     void Initiliaze();
> >
> >     virtual void OnLeftButtonDown()
> >     {
> >         cout << "Picking pixel: " <<
> this->Interactor->GetEventPosition()[0]
> > << " " << this->Interactor->GetEventPosition()[1] << std::endl;
> >
> >
> this->Interactor->GetPicker()->Pick(this->Interactor->GetEventPosition()[0],
> >                             this->Interactor->GetEventPosition()[1],
> >                             0,  // always zero.
> >
> > this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());
> >         double picked[3];
> >         this->Interactor->GetPicker()->GetPickPosition(picked);
> >         cout << "Picked value: " << picked[0] << " " << picked[1] << " "
> <<
> > picked[2] << std::endl;
> >
> >         AddSelectedPoint(picked);
> >
> >         // code to display the picked values and  locations
> >         vtkSmartPointer<vtkRegularPolygonSource> circle =
> > vtkSmartPointer<vtkRegularPolygonSource>::New();
> >         circle->SetNumberOfSides(50);
> >         circle->SetRadius(1);
> >         circle->SetCenter(picked[0], picked[1], picked[2]);
> >         circle->Update();
> >
> >         vtkSmartPointer<vtkPolyDataMapper> mapper =
> > vtkSmartPointer<vtkPolyDataMapper>::New();
> >         mapper->SetInputConnection(circle->GetOutputPort());
> >         mapper->Modified();
> >
> >         vtkSmartPointer<vtkActor> actor =
> vtkSmartPointer<vtkActor>::New();
> >         vtkSmartPointer<vtkProperty> circleProperty =
> > vtkSmartPointer<vtkProperty>::New();
> >         circleProperty->SetColor(1, 1, 0);
> >         //circleProperty->SetOpacity(0.0);
> >         circleProperty->EdgeVisibilityOn();
> >         circleProperty->SetEdgeColor(1, 0, 0);
> >         actor->SetMapper(mapper);
> >         actor->SetProperty(circleProperty);
> >
> >
> this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->AddActor(actor);
> >
> >
> this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()->Render();
> >
> >         // Forward events
> >         vtkInteractorStyleTrackballCamera::OnLeftButtonDown();
> >      };
> >
> >
> >   private:
> >       void AddSelectedPoint(double point[]);
> >
> >
> >
> > };
> >
> > main.cpp
> >
> >   vtkSmartPointer<Interaction> mouseStyle =
> > vtkSmartPointer<Interaction>::New();
> >   mouseStyle->Initiliaze();
> >   mouseStyle->SetDefaultRenderer(renderer);
> >
> >   iren->SetInteractorStyle( mouseStyle );
> >
> > Thanks for any help!
> >
> > Sahithya
> >
> >
> >
> > On Fri, Nov 2, 2012 at 6:03 PM, David Gobbi <david.gobbi at gmail.com>
> wrote:
> >>
> >> Hi Sahithya,
> >>
> >> The following example comes with the VTK source code:
> >>
> >> VTK/ImageProcessing/Python/ImageInteractorReslice.py
> >>
> >> Note that you cannot use SetSlicePlane() together with
> >> SliceFacesCameraOn() and SliceAtFocalPointOn(),
> >> because when the latter two methods are used, the slice
> >> plane will be automatically set from the camera parameters
> >> and any value you set with SetSlicePlane() will be ignored.
> >>
> >>  - David
> >>
> >>
> >> On Fri, Nov 2, 2012 at 3:39 PM, Sahithya Wintrich <
> s.prakash at csuohio.edu>
> >> wrote:
> >> > Hello,
> >> >
> >> > I am new to VTK and visualization in general. I am trying to extract a
> >> > 2D
> >> > slice from a 3D volume. The classes I use are as follows:
> >> >
> >> > vtkImageReader - reads the stack of 2D CT images
> >> > vtkVolumeTextureMapper2D - Maps the volume
> >> >
> >> > in order to get a slice defined by a vtkPlane with origin and normal
> >> > corresponding to the slice of interest, I use:
> >> >
> >> >     mapper = vtkImageResliceMapper::New();
> >> >     mapper->SetInputConnection(
> >> > reader->GetOuputPort());
> >> >     mapper->SetSlicePlane(plane);
> >> >
> >> >     slice = vtkImageSlice::New();
> >> >     slice->SetMapper(mapper);
> >> >
> >> >     renderer->AddViewProp(slice);
> >> >
> >> > I understand that the vtkImageSlice is a 3D prop and I tried using
> >> > suggestions to change the position and focal point of the camera.
> >> > However,
> >> > this is still displayed in a 3D space. I need to display this as a 2D
> >> > slice
> >> > with a correct view (for oblique slices as well) and prevent the user
> >> > from
> >> > rotating the slice.
> >> >
> >> > Any help would be greatly appreciated!
> >> >
> >> > Sahithya
> >
> >
>
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