Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!eecae!tank!uxc!uxc.cso.uiuc.edu!m.cs.uiuc.edu!shirley
From: shirley@m.cs.uiuc.edu
Newsgroups: comp.graphics
Subject: viewing terminology
Message-ID: <4400032@m.cs.uiuc.edu>
Date: 14 Mar 89 21:38:00 GMT
Lines: 20
Nf-ID: #N:m.cs.uiuc.edu:4400032:000:372
Nf-From: m.cs.uiuc.edu!shirley    Mar 14 15:38:00 1989




I use the following to specify a view in my programs:

lookfrom (x, y, z)
lookat (x, y, z)
view-up-vector (x, y, z)
field-of-view (angle)


This is umambiguous for a square viewport, but when the width and height
are different, field-of-view could be left/right or up/down.  Is one
correct, or if not, is one to be prefered?


Thanks,

Peter Shirley
shirley@cs.uiuc.edu