[vtkusers] Actor that always has the same size according to the screen

[chrisyeshi]

Hi,

I need to implement some markers to indicate a point in a volume.
I want these markers to stay the same size according to the screen.
That means, when we zoom in, the markers should become larger, when we zoom
out, the markers should become smaller.

How do I do that?
Use vtkCallbackCommand?
Do I need to make a new FixedSizeActor from vtkActor?
I see there is vtkFollower, how does it implemented?

Thanks,

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