P3D Re: Ortho Relativity

[r3dzone@xxxxxxxxxxxxx (Ray Zone)]

>Ray, could you be so kind as to give your definition of
>ortho and also say what it is relative to?

Yes, John.  Thank you for asking.

"Ortho" stereo attempts to document and replicate the real world in 3-D as
it is seen with the average interpupillary distance of 2 1/2"--and, as much
as possible, to display that stereo image with all binocular disparities
suppressed, except for parallax.

Ortho is primarily relative to one's personal interpupillary distance but
many other less quantifiable factors enter into this (stereo) picture such
as stereo-acuity, hyperphoria (vertical misalignment of one's eye muscles)
and psychology.  When you weigh all the factors that affect one's stereo
perception, it becomes evident that ortho stereo is an attempt, albeit a
useful one, to establish a consensus for replicating the world in 3-D.

As practitioners of the technically-based art form of stereography we
always have the option of using established guidelines (such as the
one-to-thirty rule for determining a stereobase for photography) or
dispensing with them.  But in no case should we be bound by them.

A presumption of ortho stereophotography is that 3-D is a mimetic tool for
capturing the "real" world.  That is true.  But it is also so much more
than a means to merely imitate the world.

3-D is a binocular art form, made for viewing with two eyes.  And this work
is actually completed in the mind itself when the brain fuses, or attempts
to fuse, the binocular information.  We are presented with the distinct
possibility of creating a unique experience, a new visual reality which
addresses the binocular complexity of our perceptual hardware.  This new
binocular reality may or may not have a resemblance to our shared consensus
of the visible world.

There are pioneers of this binocular art such as Joseph Jastrow, and more
recently, Richard Lindblom and Stan White for whom the 3-D image
constitutes a new visual reality made from our (stereo) perception.  And
the computer is now a marvellous engine for exploration of our perceptions.

For further discussion of these issues, you might want to visit my website
and check out the article entitled "Bicameral Perceptions."

Best!

Ray '3-D' Zone





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