Xref: utzoo comp.graphics:4225 rec.arts.tv:8411
Path: utzoo!attcan!uunet!lll-winken!spl1!ddsw1!corpane!sparks
From: sparks@corpane.UUCP (John Sparks)
Newsgroups: comp.graphics,rec.arts.tv
Subject: Re: How to view Superbowl 3-D
Summary: It's not that big a deal
Keywords: TV 3-D graphic
Message-ID: <223@corpane.UUCP>
Date: 25 Jan 89 14:33:41 GMT
References: <3230@datapg.MN.ORG>
Distribution: na
Organization: Corpane Industries, Inc., Louisville Ky
Lines: 73

In article <3230@datapg.MN.ORG>, sewilco@datapg.MN.ORG (Scot E Wilcoxon) writes:
> While watching the show live, I found the 3-D can be
> seen by looking with the right eye through a narrow slit.
> The left eye should be uncovered.  The slit was about as
> far from the eye as a pair of glasses (I wear glasses,
> and I simply had the slit on my right lens).
> 
> 1. Tape together two large nails.  They are not exactly
> straight, and can be taped together with a very small
> slit between them.  This is awkward, but is useful for
> experimenting with small slits.  (The same effect could
> probably be done with flat-edged calipers)
> 
> 2. Take a small piece of window screen (six inch
> diameter).  Fold several times.  I used three folds
> for a pie-shaped piece with eight layers.
> 
> 3. Take a 1.5 inch by 2 inch Post-It note.  (Yes, I
> used a 3M Post-It for 3-D)  Place on suitable surface
> and with a razor blade or utility knife cut many
> parallel slits.  I made them about 1/16 inch apart,
> although closer together would probably work better.
> Put them as close together as you can..you can keep
> making them until you find the right dimensions.
> 
> I prefer Number 3, the 3-D Post-It.  I just stick it
> on the lens of my right eye, but I sometimes have to
> wriggle it a bit to make the slits open up just right.
> 
> Number 2, the screen filter, seems to work with the
> least adjustment.  Photographers might try a star
> filter.  Nylon or woven fabric might also work.
> 
> Anyone have a diffraction grating handy?  I suspect
> a dark filter over a diffraction grating might work.
> 

Why go thru all that trouble? Use a dark pair of sunglasses over one eye
leave the other eye uncovered. 


As someone posted in rec.video, the effect seems to happen becuase dark
images register later in the brain than light images. this timing difference
seems to create a 3D effect. There can be no polarization on a video screen
that I know of. How can you polarize the electron beam with a video signal??

Besides I thought the 3d effect fell flat (pun intended) the only part of
the show that looked 3d to me was the computer graphics of the planets and
stars. I noticed that the faster an object moved horizontally on the screen
the 'closer' it looked. no motion, no 3d. This is why most of the live action
did not seem 3d. the camera men where mostly stationary. And the performers
would move various part of themselves (such as the girls twirling batons) and
those parts would seem to jump out while the rest of them seemed flat. This
just sent confusing signals to my already confused mind, making the whole
thing a bust. Also, I am pretty sure there was no special equipment involved
in filming the 3d process. you can watch other shows with the glasses on
and get the same 3d effect when something moves horizontally on the screen.





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