[vtkusers] Duplicating a vtkActor

[mike jackson]

I am using a bunch of vtkActors to render my 3D scene. Each actor is
created from a vtkPolyData object with the intermediate
vtkPolyDataMapper object. This works just fine (although I do not know
how it will scale..) and I can remove actors from the scene and put
them back in (filtering) and everything runs just fine. By run I mean
I can get about 60 frames per second when interacting with the scene.
  Now I would like to let the user "duplicate" one of the actors so
that they can move the copy somewhere else in the scene (Think
periodic boundary conditions). I added the code that I thought was
necessary and while the program "works", I can only achieve about 1
frame per second. I tried about 8 different models (all STL files) and
all exhibit this behavior. I can reproduce it every time. I can load
the model, interact with it at full speed, "copy" an actor and then my
speed drops to about 1 FPS.

Here is the code that I am using:
//actors is a vtkActorCollection
//_numRegions is the number of actors in the scene. Each actor has its
//   own PolyData it renders.. is this a good idea?
// _colorTable is a vtkColorTable that I generated earlier. It will be
one short as it
//    only has _numRegions of entries BEFORE I increment _numRegions
//

vtkActor *actor = vtkActor::SafeDownCast( actors->GetItemAsObject(rowIndex) );
vtkPolyData *copy = vtkPolyData::New();
copy->DeepCopy(actor->GetMapper()->GetInput());
vtkPolyDataMapper *mapper = vtkPolyDataMapper::New();
_numRegions++;
mapper->SetInput(copy);
mapper->ScalarVisibilityOn();
mapper->SetScalarRange (0, _numRegions);
mapper->SetLookupTable(_colorTable);

vtkActor *dataActor = vtkActor::New();
dataActor->SetMapper(mapper);
dataActor->GetProperty()->SetOpacity(1.0f);
dataActor->GetProperty()->SetInterpolation( VTK_GOURAUD );
dataActor->GetProperty()->SetRepresentationToSurface();
dataActor->SetPosition(actor->GetPosition() );
actors->AddItem(dataActor);

[vtkView renderer]->AddActor(dataActor);
dataActor->Delete();
mapper->Delete();
copy->Delete();

I was hoping there was something like an actor->DeepCopy(); method
that I could call but
I did not find anything in the docs.

Is there something glaring that I am missing?

Thanks for any help.
--
Mike Jackson
imikejackson _at_ gee-mail dot com