[vtkusers] Reset Camera of render window

[Zhu Yong]

Hi,

I have a render window, the actors on the window may change with users' 
interaction. Some time the actor is a small object, and some time it is very 
large. Is there any function to set the camera to a perfect position so that 
only a specific actor is shown in the render window?
I tried to use ResetCamera(bound[6]), but seems it won't zoom in/out.

Thanks

Ggds
Zhu Yong

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