[vtkusers] clipping - memory leaks

[Andres Barrera]

Dear list,

  I want to repeatedly clip a vtkPolyData of a vtkActor, and assign the 
result of the operation to the actor. I am doing

clipping( vtkActor* 		surfaceActor,
            vtkImplicitFunction*	implicit,
            vtkTransform* 	myTransform)
{     ...
     implicit->SetTransform( myTransform);
     //CLIPPING
     vtkClipPolyData *clipper            = vtkClipPolyData::New();
            clipper->SetInput       ( (vtkPolyData *) 
(surfaceActor->GetMapper())->GetInput() );
            clipper->SetClipFunction( implicit      );
     // Replace for the new PolyData.... (leaks memory)
     ((vtkPolyDataMapper* ) 
surfaceActor->GetMapper())->SetInput(clipper->GetOutput() );
     ((vtkPolyDataMapper* ) surfaceActor->GetMapper())->Update();
     ...
     //clean up
     clipper        ->Delete();
}

That does what I want, but I am not releasing the memory for the old 
PolyData. I've tried different ways like:

  vtkPolyData* pd = vtkPolyData::New();
     pd = clipper->GetOutput() ;
   ( ( (vtkPolyDataMapper*)surfaceActor->GetMapper() ) ->GetInput() 
)->Delete();
     ( (vtkPolyDataMapper*)surfaceActor->GetMapper() ) ->Update();
     ( (vtkPolyDataMapper*)surfaceActor->GetMapper() ) ->SetInput(pd) ;
     ( (vtkPolyDataMapper*)surfaceActor->GetMapper() ) ->Update();

or even replacing the PolyDataMapper, but still my program either does not 
compile, leaks memory, or crashes after the clipping loop starts.

Can anyone give me a an idea on how to do that properly?

  Thank you all.

            Andres

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