The wimpy (non-mathematical, less learning involved) way to do what Warp
described is to create a thin box in front of the camera that covers the
viewing plane, and then use trace() from the point you're testing to the
camera's location and see if it hits the box.

Neither of these methods work so easily for a non-perspective camera,
however.

 - Slime
[ http://www.slimeland.com/ ]

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