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From: jqj@cornell.UUCP (J Q Johnson)
Newsgroups: net.periphs,net.research,net.graphics
Subject: Re: volumetric displays
Message-ID: <886@cornell.UUCP>
Date: Thu, 3-Oct-85 05:38:56 EDT
Article-I.D.: cornell.886
Posted: Thu Oct  3 05:38:56 1985
Date-Received: Fri, 4-Oct-85 03:43:48 EDT
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Reply-To: jqj@cornell.UUCP (J Q Johnson)
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Organization: Cornell Univ. CS Dept.
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In article <309@bdaemon.UUCP> carl@bdaemon.UUCP (carl) writes:
>> > Obviously, resolution is a function of the third power of the bandwidth ...
>> 
>> That's not obvious at all.  Once you get near the eye's resolving
>> ability, further improvement buys nothing.  
>> . . .
>A rare instance when Doug misses the point.  A stereoscopic display
>consisting of two 512-pixel square images is fine if all you want is a nice
>*static* picture of Granny in front of Old Faithful.  However, a dynamic
>sequence showing Granny walking to the right spot, Old Faithful gurgling
>and spitting before finally starting to spout at full speed etc., etc. will
>require about 30 * 2 * 512 * 512 = 1.57 * 10 ^ 7 pixels per second if each
>pixel is either on or off and if we want to avoid excessive flicker.  

Ah, but the point is that quite a bit of depth info is available for only
a factor of 2 increase over 2d.  Granted, digital animation is expensive!
But even there temporal coherence can be used to reduce the needed bandwidth;
the trees in the background aren't changing.

The real problem with stereo is that it doesn't give much 3d data.  It's
static perspective, and works only if you have exactly 2 eyes (what about the
poor Venerians?).  I want to be able to move my head and look behind an object!