Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!nrl-cmf!ames!ucsd!sdcc6!sdcc10!cs161agc
From: cs161agc@sdcc10.ucsd.EDU (John Schultz)
Newsgroups: comp.graphics
Subject: Re: ShowScan
Message-ID: <73@sdcc10.ucsd.EDU>
Date: 31 Jan 89 02:48:29 GMT
References: <883@amethyst.ma.arizona.edu>
Reply-To: cs161agc@sdcc10.ucsd.edu.UUCP (John Schultz)
Organization: University of California, San Diego
Lines: 20

In article <883@amethyst.ma.arizona.edu> chris@spock.ame.arizona.edu (Chris Ott) writes:
>     Actually, I've heard that someone (George Lucas maybe?) has
>experimented with a setup where showing 60 frames/sec allows the audience
>to see in 3D _without_ glasses. Supposedly, they just alternate between
>eyes, i.e. show a frame for the left eye for 1/60th of a second then a
>frame for the right eye for another 1/60th of a second, and so on, so the
>effective frame rate is actually 1/30th of a second. Still, 3D without
>glasses sounds pretty nice.

  How can this work? Both eyes will see both images.  ShowScan
itself has an almost 3D quality, but alternating left/right images
at 60hz will produce a noticeable "double image" if the left/right
eyes are not masked from the opposite right/left display frames.
They must be doing something else other than alternating stereo
pairs.  I generate stereo 3D on the Amiga by the same technique as
described above, but we use an LCD shutter the mask off the
appropriate images...


  John Schultz