[vtkusers] Getting point value on picking besides the coordinates

[abhinay]

Hi David

Thanks a bunch

However none of them give me the data value

 Picking pixel: 259 238 259

Picked value: 0 0 0

Thats all i keep on getting 0 0 0 instead of th input values

Thanks and best regards
abhinay

"Stanford beats Cal!!"

On Sun, Nov 21, 2010 at 5:37 AM, David Doria-2-3 [via VTK] <
ml-node+3274314-1328040372-144542 at n5.nabble.com<ml-node%2B3274314-1328040372-144542 at n5.nabble.com>
> wrote:

> On Sat, Nov 20, 2010 at 9:49 PM, abhinay <[hidden email]<http://user/SendEmail.jtp?type=node&node=3274314&i=0>>
> wrote:
>
> >
> > HI
> >
> > I have a vtkwidget which i am using to show k means clustering in 3d , I
> am
> > stuck with getting the value of the point which was clicked I am just
> able
> > to get the value of the pixel. Here is what I do
> >
> >
> > vtkSmartPointer<vtkPoints> points =
> >      vtkSmartPointer<vtkPoints>::New();
> >
> >  points->InsertNextPoint ( 0.0, 0.0, 0.0 );
> >  points->InsertNextPoint ( 3.0, 3.0, 3.0 );
> >  points->InsertNextPoint ( 0.1, 0.1, 0.1 );
> >  .
> >  .
> >
> >  //get the points into the format needed for KMeans
> >  vtkSmartPointer<vtkTable> inputData =
> >      vtkSmartPointer<vtkTable>::New();
> >
> >
> >
> > //display
> >
> >  vtkSmartPointer<vtkVertexGlyphFilter> glyphFilter =
> >    vtkSmartPointer<vtkVertexGlyphFilter>::New();
> >  glyphFilter->SetInputConnection(polydata->GetProducerPort());
> >  glyphFilter->Update();
> >
> >  //Create a mapper and actor
> >  vtkSmartPointer<vtkPolyDataMapper> mapper =
> >      vtkSmartPointer<vtkPolyDataMapper>::New();
> >  mapper->SetInputConnection(glyphFilter->GetOutputPort());
> >
> >  vtkSmartPointer<vtkActor> actor =
> >      vtkSmartPointer<vtkActor>::New();
> >  actor->SetMapper(mapper);
> >  actor->GetProperty()->SetPointSize(3);
> >
> >  //Create a renderer, render window, and interactor
> >  vtkSmartPointer<vtkRenderer> renderer =
> >      vtkSmartPointer<vtkRenderer>::New();
> >  vtkSmartPointer<vtkRenderWindow> renderWindow =
> >      vtkSmartPointer<vtkRenderWindow>::New();
> >  renderWindow->AddRenderer(renderer);
> >  vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
> >      vtkSmartPointer<vtkRenderWindowInteractor>::New();
> >  renderWindowInteractor->SetRenderWindow(renderWindow);
> >
> >
> >
> >  renderer->AddActor(actor);
> >
> >   vtkSmartPointer<MouseInteractorStylePP> style =
> >      vtkSmartPointer<MouseInteractorStylePP>::New();
> >    renderWindowInteractor->SetInteractorStyle( style );
> >
> > Now in the mouse interactor I have the following :
> >
> > class MouseInteractorStylePP : public vtkInteractorStyleTrackballCamera
> > {
> >  public:
> >    static MouseInteractorStylePP* New();
> >    vtkTypeMacro(MouseInteractorStylePP,
> vtkInteractorStyleTrackballCamera);
> >
> >    MouseInteractorStylePP()
> >        {
> >          this->SelectedMapper = vtkSmartPointer<vtkDataSetMapper>::New();
>
> >          this->SelectedActor = vtkSmartPointer<vtkActor>::New();
> >          this->SelectedActor->SetMapper(SelectedMapper);
> >        }
> >
> >    virtual void OnLeftButtonDown()
> >    {
> >      std::cout << "Picking pixel: " <<
> > this->Interactor->GetEventPosition()[0] << " " <<
> > this->Interactor->GetEventPosition()[1]<< " " <<
> > this->Interactor->GetEventPosition()[2] << std::endl;
> >
> >
> this->Interactor->GetPicker()->Pick(this->Interactor->GetEventPosition()[0],
>
> >                         this->Interactor->GetEventPosition()[1],
> >                         this->Interactor->GetEventPosition()[2],  //
> always
> > zero.
> >
> > this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer());
>
> >      double picked[3],data;
> >      this->Interactor->GetPicker()->GetPickPosition(picked);
> >      std::cout << "Picked value: " << picked[0] << " " << picked[1] << "
> "
> > << picked[2] << std::endl;
> >
> >     how do i get the polydata value associated with this pixel at the
> time
> > of the click?
> >
> > ====
> >
> > Am i supposed to do something like th following? (and how?)
> >
> >  vtkSmartPointer<vtkVertexGlyphFilter> glyphFilter =
> >             vtkSmartPointer<vtkVertexGlyphFilter>::New();
> >
> > glyphFilter->SetInputConnection(extractGeometry->GetOutputPort());
> >           glyphFilter->Update();
> >
> >           vtkPolyData* selected = glyphFilter->GetOutput();
> >           std::cout << "Selected " << selected->GetNumberOfPoints() << "
> > points." << std::endl;
> >           std::cout << "Selected " << selected->GetNumberOfCells() << "
> > cells." << std::endl;
> >           this->SelectedMapper->SetInput(selected);
> >
> >
> > Please advise
> >
> > Thanks and best regards
> > abhinay
>
> Take a look at these examples:
>
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/PointPicker
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/WorldPointPicker
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/MoveAVertex
>
> David
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