Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!gem.mps.ohio-state.edu!apple!well!lmeyer
From: lmeyer@well.UUCP (lhary meyer)
Newsgroups: comp.graphics
Subject: Re: polarized film?
Keywords: 3-D, film, stereo-viewing
Message-ID: <14021@well.UUCP>
Date: 10 Oct 89 05:51:16 GMT
References: <475@alias.UUCP> <65539@tut.cis.ohio-state.edu>
Reply-To: lmeyer@well.UUCP (lhary meyer)
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 13


The 3D films have two windows in each frame, the top half is left and the
bottom is right ( or v-v, no standard exists). Via a assemblage of prisms
and mirrors, each windows light follows a separate optical path to the screen.
You put sheet polarizers at +/- 45 degs. (not Hor. and Vert), one per path.
Thus two simultaneous images are projected upon the same screen, but with
ortag
(sic) orthagonal polorization.

You could also use two separate projectors, as proposed above, but the
problems
of holding perfect frame sync and shutter phasing are very tricky. When done
properly, as at Disneyland with dual 70 mm, its works great!!