Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!sdd.hp.com!zaphod.mps.ohio-state.edu!rphroy!caen!news
From: gregor@oit.itd.umich.edu (Gregor Purdy)
Newsgroups: comp.graphics
Subject: 3D Viewing parameters from Foley & VD, etc.
Message-ID: <1991May21.095505.25679@engin.umich.edu>
Date: 21 May 91 09:55:05 GMT
Organization: The University of Michigan, Ann Arbor
Lines: 20

Friends--

I'm a computer programmer of a few years trying to absorb some of the material
from Foley & VD, etc. re: 3D Viewing. I don't have the book in front of me
just now, but one problem I need help with is the parameter VPN (View Plane
Normal). Early on, it seems that VPN points AWAY from whatever you are viewing,
but in a later diagram, they show it pointing TOWARD what's being viewed.

So, which is it?

Thanks,

--Gregor

----------------------------------------+-------------------------------------
Gregor N. Purdy, NeXT Campus Consultant | "I am that which is not everything
OIT, University of Michigan             |  else." -- Gregor N. Purdy
Ann Arbor, MI 48109                     +-------------------------------------
gregor@oit.itd.umich.edu                |     One species, one government!
----------------------------------------+-------------------------------------