[vtkusers] vtkCamera to follow vtkActor

[Paul Tait]

Hi

I have several actors in a scene and am using AddPosition(0, 0, n) to
move them interactively up and down vertically. This means actors move
off the bottom of the screen so I have to use the mouse middlebutton to
follow them. How can I program vtk so that when I move my actors the
actor in the centre of the screen (focalpoint?) stays centred ?

Thanks Paul

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