STEREO VIEWING ON SMALL COMPUTERS

jean-yves sgro sgro at rhino.bocklabs.wisc.edu
Thu Oct 28 16:09:28 EST 1993


SUBJECT: VIEWING STEREO ON IMAGES WITH KINEMAGE
------------------------------------------------

>Jean-Yves:
>Hello, how are you?  Congrats for the FTP traffic!  
>The stuff you put outis neat!
>I need some advice on how to see kinemage or macinplot in 3-D.  
>Explain: If I display  the alpha-C of a structure and rotate 
>it around I kind of get an idea of its structure 
>but it is still difficult to visualize.  (never satisfied)  
>So, I tried to use the stereo option of these programs which will 
>paint 2 images of the structure on the screen.
> However this is not helping me because my eyes are not used to 
>get the 3-D effect this way, unless I use some  kind of glasses.  
>What is the way (if any) to see actual 3-D with this
>images on the Mac screen? Thanks for your help & advice.
>Ruben
>rdonis at unlinfo.unl.edu (Ruben Donis)


Stereo viewing requires that each eye sees the same image
with a slight different degree of rotation (6 degrees).

The kinemage program option "stereo" will create a split
screen with the left image in the left panel and the right
image in the right panel (=walleyed stereo, in contrast
to crosseyed stereo).

To view these images one has to "relax" the vision i.e.
focus "behind" the monitor screen until the 2 images 
merge. This requires practice. Some people never succed.

A way around this is to use a special pair of glasses that
are in fact a box with 2 reflective mirrors on the side.
When placed on the head the mirrors reflect only the
appropriate image to each eye.  The only company that I
know to sell such glasses is:
				nu3Dvu Co.
				71 Easct 28th Avenue
				Eugene, Oregon 97405
				tel 503-484-6176

The glasses come in a black cardboard housing for 50$
or in wood for $75

This information dates back to *1988* and may not be
accurate anymore. 

I used to use these glasses when working with an Evans and 
Sutherland (E&S) PS390 graphicssystem. Crystallographers still 
use this equipment nowdays.

The modern alternative is the Crystal-Eye system which makes the
computer to display BOTH images on top of each other and then
assume a flicker of 1/120th of a second. You need then to have
an emitter (about $300) and LCD shutter glasses ($1500 each pair!).
But that is not all. The computer has to be "Stereo Ready". A silicon
Graphics comes standard like this but not the Mac. To implement
this option (if it actually exist) would cost a LOT!!!! To make
the E&S stereo-ready would have cost over $10,000......

I have heard (!) last week of a system being developped that 
resembles the nu3Dvu glasses system but the device holding
the mirrors are put ontop of the monitor itself. By positioning
yourself relative to the screen you then see stereo *without*
any special glasses. But I have not more information about this.....

CONCLUSION:
----------	If stereo viewing is important for you invest in
the nu3Dvu glasses, they allow you to see stereo without "forcing"
or straining your eyes. They will work on the computer screen but also
with *any* split image you'll find! slides projected at large size,
magazines, photographs (make your own stereo images!), printed pictures....


NOTE:
-----	The new version of Kinemage allows FULL SCREEN
display which was not possible before

	An alternative to stereo is motion. With MacInPlot
you can animate the molecule automatically in front of you
in real time. If you like what you see you can then save the
frames and transform this into a QuickTime movie....
(and if your movie is nice you can upload it to this
site -see signature below- and share it with the rest of
the world


Sincerely,

Jean-Yves

Jean-Yves Sgro, Ph.D.
Assistant Scientist

Institute for Molecular Virology
Robert M. Bock Laboratories
University of Wisconsin-Madison
1525, Linden Drive
Madison Wi 53706 -USA-

e-mail:         sgro at macc.wisc.edu
anonymous ftp:  rhino.bocklabs.wisc.edu
(Internet #  :  144.92.19.130)
telephone:      (608) 262 - 7464
facsimile:      (608) 262 - 7414
[USA International country code is 1]


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