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From: jbn@wdl1.UUCP
Newsgroups: net.graphics
Subject: Re: Re: Stereo Picture TV
Message-ID: <482@wdl1.UUCP>
Date: Thu, 11-Jul-85 16:19:36 EDT
Article-I.D.: wdl1.482
Posted: Thu Jul 11 16:19:36 1985
Date-Received: Wed, 17-Jul-85 05:55:06 EDT
Sender: notes@wdl1.UUCP
Organization: Ford Aerospace, Western Development Laboratories
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Nf-ID: #R:ecsvax:-158700:wdl1:14000006:000:969
Nf-From: wdl1!jbn    Jul 11 12:37:00 1985


       About two years ago American Cinematographer had an issue on 3D,
in which the subject of making 3D movies that don't cause eyestrain was
discussed in much detail.  This is a non-trivial problem, because we
want to put images on the screen that aren't in 1:1 scale with reality,
and this implies that certain arbitrary choices must be made about the
viewing plane.  But there's a custom calculator available to help make
them.
       By the way, the most common cause of eyestrain in 3D movies is
misadjusted projector optics.  Look at the image without glasses; if there
is any horizontal misalignment visible between the two images, 
the 3D splitter isn't mounted straight.  There is a 3D alignment leader 
available through SMPTE which if projected through the 3D splitter but 
viewed without polarized glasses makes it instantly obvious if things are 
misaligned.  Mention this to your theater manager as you are demanding 
your money back. 

					John Nagle