[vtkusers] Beam's eye view and viewUpVector

[Jothybasu Selvaraj]

Hi all,

I am trying to the objects in a scene from the source position onto the
projection plane. To achive this I am setting the camera focal position to
the projection planes's center and the camera position to source position.
And the camera viewUpVecto to (0,0,-1). This works well for 0 and 180
degree projection (clockwise).

I doesn't project the views properly for other angles. I think I need to
set a proprt viewUpVector along with the other parameters.

Can anyone suggest me how to calculate the viewUpVector and any other
setting that is necesary for proper projection?

Thanks

-- 
Jothy
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