> Is there a way of determining whether an object is within the viewing
> frustum?


One thing I've done in the past is used screen.inc to create a "screen
plane" - a flat box in front of the camera. Then, by using trace() with this
screen plane from a point to the camera's position, I can determine if the
point is within the camera's viewing frustrum by whether the object is
intersected or not.

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

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