[vtkusers] Simple queries

[Sawsan Ahmed]

Hi,
      I am not using any user interaction.Without user interaction how can I do that?
  Oliver.

John Platt <jcplatt at dsl.pipex.com> wrote:
                Hi,
   
  Have you tried using vtkCellPicker in your interactor?
   
     vtCellPicker* cellPicker = vtkCellPicker::New();
     myInteractor->SetPicker(cellPicker);
     cellPicker->Delete();
   
  Then add observers for the standard pick event (P key)
   
     vtkCallbackCommand* pickEventCBC = vtkCallbackCommand::New();
     pickEventCBC->SetCallback(MyPickEventHandler );
     vtkAbstractPicker* picker = myInteractor->GetPicker();
     picker->AddObserver( vtkCommand::StartPickEvent, pickEventCBC, 0.5 );
     picker->AddObserver( vtkCommand::PickEvent,        pickEventCBC, 0.5 );
     picker->AddObserver( vtkCommand::EndPickEvent,  pickEventCBC, 0.5 );
     pickEventCBC->Delete();
   
  Do your work in MyPickEventHandler() e.g.
   
     pickedCell = picker->GetCellId();
   
           
     
  HTH
   
  John.
  -----Original Message-----
From: vtkusers-bounces+jcplatt=dsl.pipex.com at vtk.org [mailto:vtkusers-bounces+jcplatt=dsl.pipex.com at vtk.org] On Behalf Of Oliver Diessel
Sent: 22 January 2007 07:41
To: vtkusers at vtk.org
Subject: [vtkusers] Simple queries
   
    Hi Everybody,

                       I am quite new in VTK.I have some queries.I have got a point on the surface of an object.I want to know the cell id which contains the point and I also want to know the normal of the cell ( Is there any difference between point normal and cell normal?) 

    Thanks everyone in advance.

     

    Oliver.

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