Path: utzoo!utgpu!watmath!onfcanim!dave
From: dave@onfcanim.UUCP (Dave Martindale)
Newsgroups: comp.graphics
Subject: Re: Epcot Center 3-D movie (was Showscan, Superbowl, etc)
Keywords: What process?
Message-ID: <17358@onfcanim.UUCP>
Date: 2 Feb 89 15:18:48 GMT
References: <6313@ecsvax.uncecs.edu>
Reply-To: dave@onfcanim.UUCP (Dave Martindale)
Organization: National Film Board / Office national du film, Montreal
Lines: 21

In article <6313@ecsvax.uncecs.edu> cjl@ecsvax.uncecs.edu (Charles J. Lord) writes:
>
>OK, no one else asked, so I will.  What is the alternate polarized
>frame process used in the Capt EO film at the Epcot Kodak pavillion?
>What is the frame rate?  Is it a shutter system or twin projectors?

It was shot with two standard 70mm cameras, using a beamsplitter mirror
to allow the lenses to get close together.  As far as I know, it's 24
FPS, but Disney likes to do things at 30 FPS sometimes so they might
have used that for Captain Eo too.

I believe projection is done by two 70mm projectors with polarizing
filters in front of each, as usual.

Any sort of shutter system that showed images for each eye alternately
would require the audience to wear glasses that also contained shutters
- rather expensive compared to simple polarizing glasses.  If you look
around SIGGRAPH, it seems that 3-D display vendors have stopped using
shutter glasses that require them to be connected to the workstation
with a wire, and switched to an active polarizing screen in front of
the CRT plus passive glasses on the viewers.