FW: [vtkusers] Simple queries

[Aina Nagma]

Hi,
      I have following two suggestions regarding the query:
      1) I think  instead of GetCellPoints() ,it is better to use either foundCellId/FindAndGetCell ( I am not sure though).
     2)As far as I know vtkPolyDataNormals give point normals.Others can suggest regarding getting cell nomals.
   
  Best regards,
   
  A. N.

John Platt <jcplatt at dsl.pipex.com> wrote:
                Hi,
   
  I should have read your mail more closely. If your surface is polydata, have you tried vtkPolyData::GetCellPoints()?
   
  I am guessing that the point normals are the average of the cell normals sharing the point.
   
  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 Sawsan Ahmed
Sent: 22 January 2007 12:46
To: John Platt
Cc: vtkusers at vtk.org
Subject: RE: [vtkusers] Simple queries
   
    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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