[vtkusers] Overlay watermark with widget interactivity

[Frable]

Hi all,

Is there a simple approach to overlay a .png image as watermark in the
renderwindow with opacity options and interactivity( dragable like
vtkOrientationMarkerWidget)?

I have been tinkering around a bit but still no satisfying solution so far.
So far I am using the PNGReader combined with a Actor2D, tough that would
allow me only to visualize it. 
Another idea was to use ImageActor, tough I would need to figure out how to
lock it in place at fist and then combine it with a widget for the
interactivity. 

Somehow I have the feeling that there might be a class that does exactly
what I need I just can't find it.


Greetings,
Janis





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