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From: kenm@parallel.uucp (Ken Musgrave)
Newsgroups: net.graphics
Subject: Re: Stereo Picture TV
Message-ID: <147@parallel.uucp>
Date: Fri, 12-Jul-85 15:22:12 EDT
Article-I.D.: parallel.147
Posted: Fri Jul 12 15:22:12 1985
Date-Received: Sat, 13-Jul-85 14:59:46 EDT
References: <8794@ucbvax.ARPA> <1944@ukma.UUCP>
Reply-To: kenm@parallel.UUCP (Ken Musgrave)
Organization: Parallel Computers, Inc.
Lines: 24
Summary: 

In article <1944@ukma.UUCP> sean@ukma.UUCP (Sean Casey) writes:
>
>
>Now what I'D like to see is a 3-d system where you didn't have to wear glasses.
>
>
  Perhaps you've not heard of the varifocal or vibrating mirror class of 3d
display devices.  The image of a CRT is relected from a piece of aluminized
Mylar stretched across a woofer (speaker) which deforms it (very close to
spherically) at 30hz.  The focal length of the mirror changes, and the 
CRT's display is synchronized with it.  Thus one gets a true volume-filling
3d display without the need for any special glasses.  It has been implemented
for both random and raster scan display modes.  Groups at University of Utah
and North Carolina have devoloped these devices, and there was one commer-
cially marketed, primarily for seismic data and medical imaging.  Advantages
include variable point of view (unlike stereoscopically recorded images);
disadvantages include low display brightness and transparency of images
(i.e., no hidden surface removal).  It is ideal for display of CAT scans
and medical NMR images, but would never work for movies.

Ken Musgrave
CS net: ucbvax\!ucscc\!ucscv:bozo  	UUCP: ucscv\!bozo
Computer and Information Science Board
UC Santa Cruz, Santa Cruz, CA 95060