Xref: utzoo comp.graphics:4193 rec.arts.tv:8297
Path: utzoo!attcan!uunet!lll-winken!ncis.llnl.gov!helios.ee.lbl.gov!pasteur!ucbvax!bloom-beacon!tut.cis.ohio-state.edu!bgsuvax!rekill
From: rekill@bgsuvax.UUCP (-=Stone Soup=-)
Newsgroups: comp.graphics,rec.arts.tv
Subject: Re: How to view Superbowl 3-D
Message-ID: <3456@bgsuvax.UUCP>
Date: 24 Jan 89 02:44:07 GMT
References: <3230@datapg.MN.ORG>
Distribution: na
Organization: Bowling Green State University B.G., Oh.
Lines: 85

From article <3230@datapg.MN.ORG>, by sewilco@datapg.MN.ORG (Scot E Wilcoxon):
*8-) --> I don't care for the Diet version of Coke, so I don't have
*8-) --> the "official" 3-D glasses.  Nevertheless, I taped the
*8-) --> Superbowl halftime show in case it was worth later getting
*8-) --> the glasses.  I found the 3-D effect can be viewed from
*8-) --> the tape (SP speed) as well as live.
*8-) --> 
*8-) --> All I knew of the glasses was what was shown on TV, with
*8-) --> an almost clear left lens and a dark right lens.  I
*8-) --> suspected the right lens was either polarized or was
*8-) --> creating an interference pattern (perhaps both), as
*8-) --> the image was supposed to look good without glasses.
*8-) --> 
*8-) --> While watching the show live, I found the 3-D can be
*8-) --> seen by looking with the right eye through a narrow slit.
*8-) --> The left eye should be uncovered.  The slit was about as
*8-) --> far from the eye as a pair of glasses (I wear glasses,
*8-) --> and I simply had the slit on my right lens).
*8-) --> 
*8-) --> When looking only through the right eye, the slit should
*8-) --> be narrow enough to cause any TV image to have a series
*8-) --> of narrow horizontal bands.  The bands look to me like
*8-) --> an interference pattern, so they are an optical effect
*8-) --> of the small slit.  A single slit works if it happens
*8-) --> to cover most of the TV image.
*8-) --> 
*8-) --> With a little experimentation later with the taped
*8-) --> image, I found three objects which work better than
*8-) --> the slit between two fingers.
*8-) --> 
*8-) --> 1. Tape together two large nails.  They are not exactly
*8-) --> straight, and can be taped together with a very small
*8-) --> slit between them.  This is awkward, but is useful for
*8-) --> experimenting with small slits.  (The same effect could
*8-) --> probably be done with flat-edged calipers)
*8-) --> 
*8-) --> 2. Take a small piece of window screen (six inch
*8-) --> diameter).  Fold several times.  I used three folds
*8-) --> for a pie-shaped piece with eight layers.
*8-) --> 
*8-) --> 3. Take a 1.5 inch by 2 inch Post-It note.  (Yes, I
*8-) --> used a 3M Post-It for 3-D)  Place on suitable surface
*8-) --> and with a razor blade or utility knife cut many
*8-) --> parallel slits.  I made them about 1/16 inch apart,
*8-) --> although closer together would probably work better.
*8-) --> Put them as close together as you can..you can keep
*8-) --> making them until you find the right dimensions.
*8-) --> 
*8-) --> I prefer Number 3, the 3-D Post-It.  I just stick it
*8-) --> on the lens of my right eye, but I sometimes have to
*8-) --> wriggle it a bit to make the slits open up just right.
*8-) --> 
*8-) --> Number 2, the screen filter, seems to work with the
*8-) --> least adjustment.  Photographers might try a star
*8-) --> filter.  Nylon or woven fabric might also work.
*8-) --> 
*8-) --> Anyone have a diffraction grating handy?  I suspect
*8-) --> a dark filter over a diffraction grating might work.
*8-) --> 
*8-) --> How about one dark polarized lens?
*8-) --> 
*8-) --> As you might expect, the animated backgrounds and
*8-) --> closeups have the most extreme 3-D effects.  The
*8-) --> planet/star background and rotating cards are my
*8-) --> favorites for testing.
*8-) --> -- 
*8-) --> Scot E. Wilcoxon  sewilco@DataPg.MN.ORG    {amdahl|hpda}!bungia!datapg!sewilco
*8-) --> Data Progress 	 UNIX masts & rigging  +1 612-825-2607    uunet!datapg!sewilco
*8-) --> 	I'm just reversing entropy while waiting for the Big Crunch.


Scot, Scot, Scot!  What a trickster you are!  My God!  By the time
anyone takes all the time to do what you suggest they will dicover
it is much easier to just buy the damn pop and give it away.  Keep 
the glasses though!


Botch -=Do yourselves a favor, buy the pop=- Casually


-- 
"We're not talking cute little ET's here either, Doctor."
              
             -- Colonel Ironhorse (War of the Worlds)

Botch Casually                                 rekill@andy.bgsu.edu