[vtkusers] Interacting with Actor2D?

[David Doria]

I am trying to figure out why someone should use vtkImageViewer2 vs
just a normal ImageActor. Here are two things that simply load an
image into a render window:
http://www.rpi.edu/~doriad/VTK_List/ImageActor/

The only difference is that in the NormalImageActor.cpp case the left
mouse button rotates the image out of plane, which you both
recommended fixing by deriving a new style. Is there any advantage of
one of these over the other? The documentation says ImageViewer2 is
simply a convenience class, so maybe the function of these two
examples is identical? Am I using ImageViewer2 properly by giving it a
RenderWindowInteractor? If that is not provided, both of these methods
would simply render a static, non-interact-able image to the screen?

Thanks,

David