Josh English wrote:
> I have wanted to experiment with building special viewers that force both
> eyes to look at two images at the same time, but I never got around to it.
I
> can't do the cross eyed technique myself, so I wanted to build a vieweing
box
> with a divider in the middle that seperates two images that would be
rendered
> like the green spiral on the site.

My Dad used to be a cartographer (drawer of maps), he had a pair of these
for looking at satellite photographs, the satellite returned long thin
pictures - north to south as I recall. On each orbit, the Earth rotates
slightly with respect to the satellite. By viewing the same object viewed
from two sequential orbits of the satellite, the terrain suddenly stands
out - mountains have height.

Anyway, the viewer looked neither complicated nor expensive, it was
basically a pair of glasses upside down - so they stand from the desk rather
than hanging from your ears. There was only a single lens in front of each
eye, and as far as I could tell, it seemed to be a simple magnifying glass.


--
Duncan Gray
(warning: may contain traces of nut)

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Josh English wrote:


> One thing that I would also like to know, and maybe this page will eventually
> tell me, is if polarized images have to be projected onto a screen and
> reflected, or could an image be printed onto polarized film and viewed in one
> shot with polarized lenses for the eyes
> 

I really don't know yet, but I'll add something about it under the 
filters section, as soon as I've a little more knowledge about the 
physical workings of the filters.

Remco

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Josh,

In the 1940's Polaroid corporation developed just such a single film
polarized stereoimage process. It was called Vectograph. They
planned to make 3D movies using the film, but the 1950's 3D movie
boom came and went too quickly and Polaroid made more money
with instant photography than they did from the source of their
name "Polaroid" filters for 3D viewing. Ironic that the company
that made 3D movie projection possible no longer does anything
3D but still use the name. Polaroid sold it's polarizing division to
3M about 2 years ago.

Today there is an expensive ink jet based print process that is
very similar to the Vectograph, it is called StereoJet.

http://www.sfimaging.com/Stereojet.html

Harolddd
(A long time stereoscopic image nut)

> One thing that I would also like to know, and maybe this page will
eventually
> tell me, is if polarized images have to be projected onto a screen and
> reflected, or could an image be printed onto polarized film and viewed in
one
> shot with polarized lenses for the eyes
>

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Remco,

Thank you for the web page. I have been making and projecting
stereoscopic images from POV-Ray for years. I use a vintage
(1949) TDC Vivid stereoscopic slide projector. One thing you
should know is that, since the late 1930's, the standard orientation
for the polarizing filters is opposing 45 degree angles..  / \, not -- |.
To learn more about 3D projection and the history of 3D look up
the book "Amazing 3-D" by Hal Morgan and Dan Summers
(Little, Brown 1982).

Harolddd
(long time stereoscopic 3-D enthusiast)
"Remco Poelstra" <rjp### [at] homenl> wrote in message
news:3A7### [at] homenl...
> Hi,
>
> I've made a website about viewing 3D images with polarizing filters.
> www.beryllium.net/~remco/polaroid/
> It's based on an experiment I'm doing for physics together with a friend.
> All images will be done in povray, but only the simple images (to
> explain how it works) are done by me. For the cool images did I recieve
> some sourcecode from TonyB and Tor Olav Kristenen.
> The website isn't completed yet, since the experiment just started.
>
> I hope some might get inspired and try this at home!
>
> Please tell me whether you like the site or not and so on.
>
> Remco Poelstra
>

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Harold Baize wrote:

> Remco,
> 
> Thank you for the web page. I have been making and projecting
> stereoscopic images from POV-Ray for years. I use a vintage
> (1949) TDC Vivid stereoscopic slide projector.

Can you tell me more about that projector?

> One thing you
> should know is that, since the late 1930's, the standard orientation
> for the polarizing filters is opposing 45 degree angles..  / \, not -- |.

Do you know why or can I find that in that book?
Thanks for the information,

Remco Poelstra

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The TDC 116 stereo slide projector was made to show 3D slides
in the "Realist" format. This was a 3D slide format that started
with the Stereo Realist camera that was introduced in 1947.
They were very popular in the early 1950's and there are still
thousands of them available and they still work. I have about a
dozen of these old cameras and I love them. They can be bought
on eBay for about $150.

You can see a TDC 116 3D projector at this eBay auction:
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=1210371798

I don't know where you can buy the book "Amazing 3-D" except that
it sometimes shows up on eBay. To learn more about stereoscopic
photography follow the links at my web sites:

http://www.3dculture.com

Harolddd


"Remco Poelstra" <rjp### [at] homenl> wrote in message
news:3A7### [at] homenl...
> Harold Baize wrote:
>
> > Remco,
> >
> > Thank you for the web page. I have been making and projecting
> > stereoscopic images from POV-Ray for years. I use a vintage
> > (1949) TDC Vivid stereoscopic slide projector.
>
> Can you tell me more about that projector?
>
> > One thing you
> > should know is that, since the late 1930's, the standard orientation
> > for the polarizing filters is opposing 45 degree angles..  / \, not --
|.
>
> Do you know why or can I find that in that book?
> Thanks for the information,
>
> Remco Poelstra
>

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Dear Remco,

 I'd like to visit your site at the beryllium.net for polarizing filter use.
I could not connect to the site you gave. I'll appreciate it if you could
guide me to your site(or your new site).

Jong
"Remco Poelstra" <rjp### [at] homenl> wrote in message
news:3A7### [at] homenl...
> Hi,
>
> I've made a website about viewing 3D images with polarizing filters.
> www.beryllium.net/~remco/polaroid/
> It's based on an experiment I'm doing for physics together with a friend.
> All images will be done in povray, but only the simple images (to
> explain how it works) are done by me. For the cool images did I recieve
> some sourcecode from TonyB and Tor Olav Kristenen.
> The website isn't completed yet, since the experiment just started.
>
> I hope some might get inspired and try this at home!
>
> Please tell me whether you like the site or not and so on.
>
> Remco Poelstra
>

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"Jong" <jjk### [at] mmewhaackr> wrote in message news:3da6a62a$1@news.povray.org...

> I could not connect to the site you gave. I'll appreciate it if

> > www.beryllium.net/~remco/polaroid/

Works for me ( http://www.beryllium.net/~remco/polaroid/index.html )

try again?

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IMAX theatres usually use LCS (liquid crystal shutter) glasses, not passive
polarization as Remco Poelstra describes on his web site. Passive
polarization
for projection has been in wide spread use since the late 1930's when
Edwin Land developed a cost efficient method of making polarizing filters.
Hence the name "Polaroid" for his company which today makes instant
cameras and film.

Stereoscopic slides were very popular in the early 1950's. I have two
3D projectors from the era that I often use for 3D slide shows. I've
been using POV-Ray to make stereo images and have been putting
them on slides for 3D projection since 1994.

All this history and technique is easy to find on the web.
Here is a good place to start:
   http://www.stereoview.org/
   http://www.stereoview.org/3dlinks.html
Also, check out my web site of 3D photos from Burning Man:
   http://www.3dculture.com/bm3d

Harolddd


"Jong" <jjk### [at] mmewhaackr> wrote in message
news:3da6a62a$1@news.povray.org...
> Dear Remco,
>
>  I'd like to visit your site at the beryllium.net for polarizing filter
use.
> I could not connect to the site you gave. I'll appreciate it if you could
> guide me to your site(or your new site).
>
> Jong
> "Remco Poelstra" <rjp### [at] homenl> wrote in message
> news:3A7### [at] homenl...
> > Hi,
> >
> > I've made a website about viewing 3D images with polarizing filters.
> > www.beryllium.net/~remco/polaroid/
> > It's based on an experiment I'm doing for physics together with a
friend.
> > All images will be done in povray, but only the simple images (to
> > explain how it works) are done by me. For the cool images did I recieve
> > some sourcecode from TonyB and Tor Olav Kristenen.
> > The website isn't completed yet, since the experiment just started.
> >
> > I hope some might get inspired and try this at home!
> >
> > Please tell me whether you like the site or not and so on.
> >
> > Remco Poelstra
> >
>
>

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I guess my Microsoft Internet Exp. 6 would not visit the site of Remco's.
I'll try it again later.

Thank you so much,

Jong

"Tom Melly" <tom### [at] tomandlucouk> wrote in message
news:3da6ad81$1@news.povray.org...
> "Jong" <jjk### [at] mmewhaackr> wrote in message
news:3da6a62a$1@news.povray.org...
>
> > I could not connect to the site you gave. I'll appreciate it if
>
> > > www.beryllium.net/~remco/polaroid/
>
> Works for me ( http://www.beryllium.net/~remco/polaroid/index.html )
>
> try again?
>
>
>

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