[vtkusers] Hiding objects on the scene

[Dejan Zivkovic]

I saw that there are  ways to hide some objects from the scene.
For example, first solution is to take the objects actor and apply
SetVisibility(false),
and the object will hide.

Second option, I suppose, is to remove the actor from the renderer.

My question is: Which is more efficient?
Does SetVisibility(false) hides the object in the way that it doesn't
render at all?

Thanks,
Dejan Zivkovic
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