[vtkusers] :( about picking...

[alletto at dei.unipd.it]

Hi all,
I have modified the example cone6.cxx by
adding 4 lines of code... but it does'nt work well..
nothing happens..
Why? Does anybody know anything about it?

#include "vtkConeSource.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkCamera.h"
#include "vtkPolyDataMapper.h"
#include "vtkActor.h"
#include "vtkRenderer.h"
#include "vtkCommand.h"
#include "vtkInteractorStyleTrackballCamera.h"
#include "vtkIoStream.h"
#include "vtkPointPicker.h"
 
class vtkMyCallback : public vtkCommand
{
public:
  static vtkMyCallback *New() 
    { return new vtkMyCallback; }
  void Delete()
    { delete this; }
  virtual void Execute(vtkObject *caller, unsigned long, void*)
  {   
      cout << "ok?";
      //vtkTransform *t = vtkTransform::New();
      //vtkBoxWidget *widget = reinterpret_cast<vtkBoxWidget*>(caller);
      //widget->GetTransform(t);
      //widget->GetProp3D()->SetUserTransform(t);
     }
};

int main( int argc, char *argv[] )
{
  vtkConeSource *cone = vtkConeSource::New();
  cone->SetHeight( 3.0 );
  cone->SetRadius( 1.0 );
  cone->SetResolution( 10 );

  vtkPolyDataMapper *coneMapper = vtkPolyDataMapper::New();
  coneMapper->SetInput( cone->GetOutput() );

  vtkActor *coneActor = vtkActor::New();
  coneActor->SetMapper( coneMapper );

  vtkRenderer *ren1= vtkRenderer::New();

  ren1->AddActor( coneActor );
  ren1->SetBackground( 0.1, 0.2, 0.4 );
  vtkRenderWindow *renWin = vtkRenderWindow::New();
  renWin->AddRenderer( ren1 );
  renWin->SetSize( 300, 300 );

  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);

  vtkInteractorStyleTrackballCamera *style = 
  vtkInteractorStyleTrackballCamera::New();
  iren->SetInteractorStyle(style);
  
  vtkPointPicker *picker = vtkPointPicker::New(); //here...
  vtkMyCallback *callback = vtkMyCallback::New();
  iren->SetPicker(picker);
  iren->AddObserver(vtkCommand::EndPickEvent, callback);
  
  iren->Initialize();
  iren->Start();
  
  cone->Delete();
  callback->Delete();
  ren1->Delete();
  renWin->Delete();
  iren->Delete();
  picker->Delete();
  style->Delete();

  return 0;
}

Thanks a lot.

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