P3D Re: PHOTO-3D digest 3231

[JNorman805@xxxxxxx]

Marvin writes:

<< Which brings us back around to the recurring factoid that three Hollywood
 directors who made 3D movies in the early fifties had only one eye (one eye
 EACH, that is). Andre de Toth, Raoul Walsh, and Herb Strock could none of
 them see in depth! >>

Don't be so sure that none could see in depth.  I recall reading in a medical
journal some time agao (sorry I can't be more precise) of instances in which
one-eyed people achieve depth perception by subtle side-to-side head
movements, with the brain accommodating itself to retain the sequential images
and combine them into a perception of depth as effectively as two-eyed people.
Does anyone else recall reading or hearing about this?

Also, binocular vision is not the only depth cue we have.  Three others that
come immediately to mind are (1) perceived relative size of objects, as
compared to what we know of actual size; (2) the effect of atmospheric haze,
with closer objects appearing sharper and more vividly colored than distant
objects; and (3) lateral movement past a scene, in which stationary objects
appear to move at different rates relative to each other, depending on how
deep into the scene they are.

I don't know whether any of the three directors could see in depth or not, but
it would surprise me if they could not.

Jim Norman


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