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Suzy B Software 2
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Suzy B Software CD-ROM 2 (1994).iso
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1995-05-05
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From : Bob Swain
To : David Cornell (x)
Subject : Random Dot Stereo images
Sig(s) : 8 (Computer Graphics)
Hi David,
Bob Swain here. I gave a book of images (called Magic Eye by
N.E. Thing) to my teenage next door neighbor. The family was quick to
catch on, but it took her weeks to get the hang of it. As a child, she
had what is called a lazy eye. What is good about her fruastration
(and persistance) is that it is good medical therapy to correct the
condition. In a nutshell, there is nothing wrong, phisically, with
either eye in people who have a "lazy eye" but the brain, for whatever
reason, uses the information from the "good" eye, while ignoring, to
greater or lesser degrees, the information sent by the "lazy" eye. The
net effect is that you are perceiving with only one eye. The person
may function with no apparent problems until some situation requires
the mixing of the two sets of visual data to resolve stereo cues. Kids
are given eye patches to cover the "good" eye and force the brain to
pay attention to the "lazy" eye, but that does not promote the ideal
of both eyes working in tandom. STIS, and its cousins, are good
therapy because it teaches the brain to use both sets of visual
impulses simultaineously.
Here is something to try. First, put a big dot (1/4" or so)
right at the top of a piece of paper and hold it at a comfortable
reading distance and focus on it. It will be at the center of your
attention, or hot spot, but you will note that you can be aware of
other things outside of that area in your periferal vision. Now let
your eyes drift over the top of the paper to focus on a more distant
but rather blank spot (like a wall that's 10' or more away). Now the
hot spot is off the paper and the dot is out of focus. While keeping
the hot spot and focus on the wall, become aware of the spot. There
should now be two spots, less distinct but noticable. Put a second dot
on the top of the paper about 1"-1 1/2" from the first and do the
exercise again. This time there will probably be 4 dots. If you slowly
start to bring your focus back to the dots, at some point, the two
sets of four dots will cross and there will seem to be three dots with
the one in the center being more prominent though they will still be
out of focus. This is how to use the allignment dots in the STIS
picture.
Print out one of the STIS example pictures (except F10 for
now).Even a 9 pin dot matrix printer will give you an excellent image.
If controling the shift of focus is difficult, try holding the
STIS picture at extreme arms length against a wall or something else
you can focus on. The keep you focus on the wall as you bring the
picture in closer. At some point, you will notice that the dots will
become three then four. Find the point for the three dot configuration
and keep the paper there. The only tricky part will be now, when you
want to shift your "hot spot" to the paper without losing the three
dot configuration. Your eyes will be tempted to shift focus by
converging at the surface of the paper. Fight that. For the moment,
let the paper be out of focus. After a while, your eyes will become
acustomed to the convergence you have set for them and you will be
able to let them focus with out losing the three dot configuration.
Now you're home free. The bottom and top portions of the
examples will resolve into the same random dot pattern that is
apparent with normal perusal, but as you slowly move your attention
(and hot spot) to other areas of the picture, you will become aware of
"glitches" in the pattern, places that don't quite match up or seem
shadowy. This is an area of 3D information. Now that your eyes are
used to the proper convergence and focus, they will try to resolve the
"glitch" and relate it to its new reference base. They will want to
shift their degree of convergence to make sense of the "glitch". Let
them. You may lose the whole thing at first, but eventually, the image
will come, and each time will be easier.
STIS, as posted, is interesting and fun, but what really knocked
my socks off was Magic Eye and the incredable apparent depth of some
of the commercial posters. I sure hope you become able to "see" them.
Hope this helps. Please forgive my pedantry. Good luck,
bob
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Message : 37129 [Open] 2-03-94 3:11am
From : Bob Swain
To : John Mosher (x)
Subject : Random Dot Stereo Images
Sig(s) : 8 (Computer Graphics)
Thanks for the input on PageStream and picture formats. Phillip
O'Neal's new Version of STIS DOES allow you to make any size picture you
want. Posters? No problem. You just have to do a bit of cut and paste with
your printout to tile the different section together- and with 256 levels
not 16 and your own background if you so choose. He just contacted me
again to let me know that he is working and that the beta version he's
sending is not a "final" product. Meanwhile, I'm trying to figure out how
to do what you indicated; take a 3D2 file, "CATSCAN" it for cross
sections, and spit out a topographical "map" of the image with a 256 color
key for processing by the new STIS. I have the 3D2 file specifications for
Cyber cad 3D but not Autocad's DXF or others. I'm a lousy programmer so
anyone willing to help is welcome to the info.
In the meantime, Phillip is working and looking for new bells and
whistles suggested by end users. If you want to suggest something, I'm
sure he'd love to hear it, but it will have to be through the mail- he
doesn't have a modem so he won't get the message through the BBS network.
Thanks again for the info. See ya,
bob
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Message : 37130 [Open] 2-03-94 3:16am
From : Bob Swain
To : Michael Burkley
Subject : Random dot Stereo Images
Sig(s) : 8 (Computer Graphics)
I'm the one who should thank you for finding and uploading STIS. As I
stated in the message just previous to this, The new improved STIS should
be awesome and Phillip is still looking for suggestions for further
improvement.
Thanks again,
bob