Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!rice!titan!foo
From: foo@titan.rice.edu (Mark Hall)
Newsgroups: comp.graphics
Subject: Re: 3-D perceptual abilities
Message-ID: <2727@kalliope.rice.edu>
Date: 2 Mar 89 14:48:33 GMT
References: <2493@masada.cs.swarthmore.edu> <238@anselm.UUCP>
Sender: usenet@rice.edu
Reply-To: foo@titan.rice.edu (Mark Hall)
Organization: Rice University, Houston
Lines: 17

In article <238@anselm.UUCP> pfarrell@anselm.UUCP (Gladiator) writes:
>Here is an interesting thought. If there were no shadows everything
>would look completely flat. Anybody agree or disagree with
>that statement?

   Disagree. It is very easy to produce computer-generated pictures
 with no shadows. A sphere does not look like a circle ( assuming
 that you have any non-ambient light.)
 
   no shadows   (Not =)  no lighting effects

   You can have highlights without having shadows. Some EEs here are
 working on a computer vision system that uses lighting (highlights)
 and multiple controllable light sources to try and determine shape.
 Shadows are a hinderance for them.

 - mark