Problem about vtk

[Lili Liu]

Would you tell me how to attach only one actor (there are several actors
in one render window) to the camera? 

Another quetion is what is the real purpose of vtkImageCorrelation, the
manpage doesn't tell in details. And How to compute the correlation value
of two images. We need the value to show how much the two images match to
each other. Or is there other ways to do this?

Thank you very much.

Lili Liu

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