Re: [photo-3d] "Cardboarding" revisited

["David Lee" <koganlee@xxxxxxxxxxxxx>]

From: "David Lee" <koganlee@xxxxxxxxxxxxx>


----- Original Message -----
From: Ray Hannisian <ray@xxxxxxx>
To: <photo-3d@xxxxxxxxxxx>
Sent: Thursday, March 16, 2000 6:30 AM
Subject: [photo-3d] "Cardboarding" revisited


> From: Ray Hannisian <ray@xxxxxxx>
>
> I'd like to revisit the issue of "cardboarding", which was under
> discussion here a few weeks back.
>
> I am coming to believe that the perceptual evolution we experience is
> based upon the fact that viewing artificial 3D involves UNCOUPLING
> 'vergence' and 'accomodation'.  No matter where our lines of sight
> converge, our focus remains steady, at the distance of the slide,
> print or screen upon which the image is displayed.  This is quite
> different from how we see the 'real world', and it takes some practice
> getting used to it.
>
No question but that this is a difference between viewing reality and
viewing a stereograph, but I believe that the reason we perceive the
phenomenon of "cardboarding" is for a simpler reason. A major difference
between viewing reality and a stereograph is that when we view a
stereograph, we, and the image, are stationary and when we view reality we
are part of the scene and are generally moving through it, however subtly.
This may sound like an unintuitive explanation, but before you dismiss it
out of hand try this: close your eyes and sit down somewhere; put your hands
on each side of your head to form blinders; open your eyes but do not move
your head. (It works best if you are not familiar with the scene.) I submit
that you will then see an effect that is much like the "cardboarding" in a
stereograph. When we move through the scene we see around objects and they
seem much more solid to us. When we hold our head still we do not get this
effect of moving through solid space and objects seem more like cutouts.

David Lee


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