T3D Re: A Third Simple One

["Greg Wageman" <gjw@xxxxxxxxxx>]

From: Bruce Springsteen <bsspringsteen@xxxxxxxxx>

>Wow!  As I say this is a new one to me, and I don't quite understand
>how a little, or a lot, more convergence suddenly "breaks" the
>accommodation decoupling.

I don't believe it's a matter of "suddenly" at all.  As the vergence
required to fuse an image increases, discomfort increases as well.
Different people will lose fusion at different points.  A slide show
with extremes that everyone watching can fuse may still produce
eyestrain headaches.  MAOFD doesn't say "if you exceed this, no one can
view it", it says instead "if you DON'T exceed this, everyone can view
it".  There's a big difference.

>Re projection demands, I am interested in
>the *ideal* case of ortho-projection viewing before discussing the
>practical limits of group screenings.  I've believed that the ortho
>seat is essentially the same, comfort and parallax-wise, as looking
>through an ortho-viewer.  Is that wrong?

As I understand it, orthoscopy speaks only to the proper reconstruction
of the scene in terms of object height, width and depth scaling equally.
I'm pretty sure there are variables in projection which can affect
vergence without affecting orthoscopy, such as whether the infinity
points or the window are superimposed on the screen.

     -Greg W. (gjw@xxxxxxxxxx)



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End of TECH-3D Digest 368
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