[PD] Gem dolly zoom

[tim vets]

Hi all,
I'm trying to figure out how to control the camera lens  in Gem.
i.e. go from normal view to 'ortho' gradually,
or still, change focal length form 18mm to 55mm...
http://en.wikipedia.org/wiki/Focal_length
I've been playing around with 'view', 'perspec' to gemwin, and also tried
changing an object's size and distance simulatneously to achieve this, but
it seems that the perspective deformation always stays the same...
any ideas?
thanks
Tim
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