[vtkusers] fixed-size labels in 3D

[Luca Pallozzi Lavorante]

Hi everybody,
I´d like to visualize labels with text information in 3D space. I verified
that vtkCaptionActor2D can do it.
My question is, can the label be fixed in size as I zoom in/out my scene?
Could somebody give me an advice on how to do that?
Should I use a vtkFollower instance? But in this case, how to rescale the
label "automatically"?

Thank you

    Luca

P.S. : vtkTextActor provides a Scaled option, but the text is not positioned
in the 3D world.
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