Help creating frustum from channel frustum

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Robert Reif (reif++at++rdvax.ntsc.navy.mil)
19 Jul 96 10:51:00 EST

I would like to create a perspective frustum that is a portion of the
channel viewing frustum using pfMakePerspFrust(frust, left, right, bottom,
top).

If I know left, right, bottom and top of the channel, it,s a simple matter
to calculate the portion I am interested in but I can't figure out how to
get these values from the viewing channel.

Does anyone have any ideas that might help me.

Thanks.

Robert Reif
reif++at++rdvax.ntsc.navy.mil

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