[vtkusers] How to enable a user to pick points from a (3D) mesh and show those points

[Ruby Shamir]

Hello,
 
I would like to enable the user to pick points using the mouse from a
(3D) mesh (as vtkActor) (for user rough point based registration).
 
I tried to implement it using getZ, and transformations from view to
world but it gave me back garbage.
 
How can I do it?
 
 
Regards,
 
  Ruby Shamir
 
 
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Some more information which might be usefull:
 
* The implementation is in MFC and I am not using the interactor.
 
* I copied the interface, the registration should be between the right
and left windows
 

 
 
 
* I copied the part of code which extracts the slices to a 3D mesh.
 
      skinExtractor = vtkContourFilter::New();
            skinExtractor->SetInput((vtkDataSet *) v16->GetOutput());
            skinExtractor->SetValue(0, 500); // for skin
      skinNormals = vtkPolyDataNormals::New();
          skinNormals->SetInput(skinExtractor->GetOutput());
          skinNormals->SetFeatureAngle(60.0);
      skinStripper = vtkStripper::New();
          skinStripper->SetInput(skinNormals->GetOutput());
      skinMapper = vtkPolyDataMapper::New();
          skinMapper->SetInput(skinStripper->GetOutput());
          skinMapper->ScalarVisibilityOff();
      skin = vtkActor::New();
          skin->SetMapper(skinMapper);
          skin->GetProperty()->SetDiffuseColor(1, .49, .25);
          skin->GetProperty()->SetSpecular(.3);
          skin->GetProperty()->SetSpecularPower(20);
          skin->GetProperty()->SetOpacity(1.0);
            skin->SetOrigin(126,126,0.5);
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----------------------------------------------------------
Ruby Shamir, 
 
School of Engineering and Computer Science 
The Hebrew University, Givat Ram 
Jerusalem, Israel
 
URL     : http://www.cs.huji.ac.il/~rubke/
Email   : rubke at cs.huji.ac.il 
 
Phones: 
    CAS Lab          +972-2-6585371 
    CS Fax:           +972-2-658-5439   
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