Re: Goodbye to the static limitations of stereo window!

[P3D Jan Gjessing <gjessing@xxxxx>]

>Dr. George A. Themelis wrote:
>Am I the only one who has a problem understanding this posting?

Since parts of your questions have already been answered by others I
shall restrict my reply.

>A new creative redesign of the stereo window.
>In the last issue of "Das 3D Magazin" No 1/97) the 3-D photographic
>artist Eva Adams, Albuqerque,USA, describes a totally new approach
>towards the rules and limitations regarding the shape and size of stereo
>window. By redsigning the stereo window with opposite symmetric but not
>so vertical borders, replacing them as bending shapes partly strait or
>angular connected borderlines.

>Can you perhaps give us an ascii drawing of this "new" concept???

No, I rather not try, its the combined choice of a selected modified
frame or stereo window and the particular image chosen that explains
best. (Thanks to RJ Thorpe for showing us one possible use and example
on his web-site.)  
Eva showed other different modifications. For instance,
the lowest part of an  image could show the foreground (road or
floor etc.) and this often  sets  the critical distance for the proper  
near limit.  This near limit can by a lot closer, without violating the
stereo window. Only the lowest part of the stereo window has to be
modified.(Maybe Alexander Klein could put some of the images on the
website of Das 3D Magazin?) 

>It utilise more depth in front of the stereo window since
>the stereo window itself is dynamic variable placed in space.

>Sorry, I don't get it, especially the last sentence.

In principle, conceptually, it could be possible to create a dynamic
(moving) window too, but not so easy or practical as for a single still
slide mount. But combined with a redesigned mount this could be
realised. 
By use of FSA (Frame Stop Animation) or  time laps, a true dynamic
stereo window should be possible, even for still slide mounts and by 
using a fade/dissolve projection set up.  

>This new innovative tooling of the stereo window should work just as
>well for print and slides and open up a new field for creative stereo
>work to be explored. For projection we can not depends on using the 
>slide>aperture as the stereo window. 

>Why is that so?

The usual  ordinary aperture  defines a  vertical stereo window only. 
Projected onto a flat surface(screen) the stereo window only extend in
the x-y-axis, while the z-axis value is zero. 

>Custom made lithfilm. masks have to be
>introduced, but this gives no mounting or alignment problems if one use
>a professional slide mount like the Wess system or similar.

>Why is that so?

First, because most of the  proper shapes or apertures  is not available
on the marked. Since our stereoscopic vision is very good at detecting
spatial errors, the exact shape of the mask or aperture is a must, as
well as their interrelated placement between left and right.
A professional slide can be utilised for true pin registration. The
masks can be duplicated with an accuracy of about 1/100mm  and there
will be no alignment errors. Mounting of the masks  that will make up a
different stereo window is automatically pre set by the pegs inside the
slide mount itself. Trying to do this manually I consider a waste of
time in particular with regard to the quality required for projection.

>She (Eva Adams) have truly moved the border of the
>stereo window, as well as the mental barrier, which for most of us would
>mean staying with a static window concept forever.
>Jan Gjessing

>I don't understand your static qualification (also in the subject of
>your posting).  Where I come from (Greece) static is something that does not
>move.  Is Ms. Adams' window moving in any way?  I don't think so. It is
>still static.  But it is redesigned. 

No, Ms Adams stereo window was not moving.
Yes, in a strict sense my use of the term <static> or <dynamic> might
cause confusion. However, I relate this as I said to the concept of the
static window and our mental barrier. A new idea will liberate us from
conventional thinking once it has been grasped. 
A moving dynamic stereo window should be both possible and easy to
create in particular with help of software design and computers
independent of whether the image itself is static or dynamic
Even for a slide show it should be possible to create a moving or
dynamic stereo window. If it will be worth while is another matter.

"Making GOOD 3-D images is a mixture of Art, 
Technical Knowledge and DESIRE..." (Bob Mannle)
  
By creative thinking we solve problems by proposing a different path for
realisation. Even if we do not have the practical means ready at once,
the basic obstacle is removed. This means that the implication of the
word <impossible> can be eradicated from our minds.

In short, if you can imagine using a solid steel ball as a lens, you are
on the right track! 
(This is indeed possible and it will work, but it is not desirable,
yet)

Jan Gjessing




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