Path: utzoo!censor!geac!jtsv16!uunet!tut.cis.ohio-state.edu!mailrus!csd4.milw.wisc.edu!bionet!apple!ames!pasteur!ucbvax!cirm.northrop.com!frobinso
From: frobinso@cirm.northrop.com (Fletcher Robinson)
Newsgroups: comp.sys.sgi
Subject: coordinate systems ...
Message-ID: <8908041523.aa23288@SMOKE.BRL.MIL>
Date: 4 Aug 89 19:25:49 GMT
Organization: The Internet
Lines: 5

Does anyone know how to map 4D SREEN coordinates of a perspective display
into cartesian coordinates ? Is there a graphics library function ? What
are the equations ?

Thanx ...