[vtkusers] Positioning camera perpendicular to image slice in rotated volumes

[Andrzej Marciniak]

I have MRI scans which are strongly rotated (direction of 
ImageData is not identity matrix). How to set initial position and viewUp of
camera, so it can be perfectly perpendicular to imageSlice in vtk.js?  
My idea is to:
- get coords of point in the middle of volume and set it as focal point 
- calculate position camera so that direction of projection is perpendicular
to image slice plane
- orthogonalizeViewUp in camera. 

However, I don't want to reinvent the wheel - if there is ready solution in
API I'd be very thankful for any help.



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