[vtkusers] Speed up vtkRenderer::AddActor

[Yang Yang]

Dear users,
I wonder if there is a way to speed up the method vtkRenderer::AddActor. I
found that when I call vtkRenderer::AddActor(vtkProp*), it will in
turn callvtkViewport::AddViewProp(vtkProp*),
vtkViewport::HasViewProp(vtkProp*) and then
vtkCollection::IsItemPresent(vtkObject*). In IsItemPresent method it loops
over all the existing actors and check if the argument actor already exists.
If I want to add for example a million actors to the renderer, this check
will take a huge amount of time. However I don't need this check, because in
my code in the higher level I garanteed that there will be no duplicate
actors added to the renderer. So My question is, is there any way to bypass
the check  IsItemPresent when calling vtkRenderer::AddActor? or is there any
other fast way to add a huge number of actors to the renderer?

Any suggestion or clue is highly appreciated!

Best
Yang
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