[vtkusers] Parallel Projection to Perspective Mode calculation

[Doug Hoppes]

Hey all,

                What is the calculation between parallel projection and perspective mode?  I have a situation where the user is in Parallel Projection Mode and then zooms in on the object in my scene. When he switches to Perspective Mode, he would like the scene to look the same (i.e. move the camera to that location).

Dougie

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