Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!tut.cis.ohio-state.edu!oscsuna.osc.edu!heinlein.osc.edu!spencer
From: spencer@heinlein.osc.edu (Stephen N. Spencer)
Newsgroups: comp.graphics
Subject: Re: polarized film?
Keywords: 3-D, film, stereo-viewing
Message-ID: <346@oscsuna.osc.edu>
Date: 10 Oct 89 20:11:29 GMT
References: <475@alias.UUCP> <65539@tut.cis.ohio-state.edu> <7176@pixar.UUCP>
Reply-To: spencer@heinlein.cgrg.ohio-state.edu (Stephen N. Spencer)
Organization: OSU Advanced Computing Center for the Arts and Design
Lines: 32

[reply to spencer@heinlein.cgrg.ohio-state.edu, not what's in the header...]

In article <7176@pixar.UUCP> flip@pixar.uucp (Flip Phillips) writes:
>
>There are also under/over doohickies where you print the right and
>left images, half size in the vertical dimention, on the same frame
>of film. Then, a special lens with a splitter reads each seperate image,
>polarizes it and projects it. Saves you from having to have two synched 
>projectors but then you only have a half sized image... tradeoffs, tradeoffs.
>

	You're right.  The over/under stereo prints WERE half-frame images,
	horizontally oriented.  The "lens" actually has several lenses which
	corrected for the format disparity.  They were a b*tch to focus (and
	where I worked, a b*tch to install -- I seem to remember that the
	lens was longer than even a CinemaScope lens and we had to do a little
	re-construction of the area around the opening in the wall of the
	projection booth where the image would come out...)

	_Friday the 13th Part 3 (in 3D)_ was done this way.

	I don't remember (or don't know) the format of _Comin' At Ya!_
	(another forgettable 3D movie which was out around 1981-1982) but
	I remember that the screen was painted silver for this feature.
	The one effect I remember (sorta sticks in my mind...) is a flaming
	spear thrown "at the camera."  

-=-
Stephen N. Spencer      |"For a successful technology, reality must take
ACCAD, 1224 Kinnear Rd. | precedence over public relations, for Nature
Columbus OH 43212       | cannot be fooled."     - Richard P. Feynman
spencer@heinlein.cgrg.ohio-state.edu OR spencer@cis.ohio-state.edu