[Papervision3D] Converting 3D Coords to 2D Coords?

[timbon]

I will add to the svn docs/wiki  in the blink of an eye if I get the formulas
for:

fov = ? given zoom and focal length (screen distance - focus?)
focal length (screen distance - focus?) = ? given fov and zoom
zoom = ? given fov and (screen distance - focus?)

Anyone know the math?
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