[vtkusers] Opacity of a complete scene (renderer)

[Tiger]

Hi.
I'm new to VTK and I have a problem, for which I haven't found a solution
yet.
What I want to do:
I want to render some layered renderers, which can contain several actors.
And I need to change the opacity of a renderer. I know how to change the
opacity of an actor, but thats not the same. The actors in one renderer
shouldn't be transparent to each other but the renderer output to everything
in the background. 
Can someone help me with that?

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