P3D Re: Photography vs Stereography

[Bruce Springsteen <bsspringsteen@xxxxxxxxx>]

Gabriel's theory of accommodation (or non-accommodation) as a chief
disruptive factor in the "reality" illusion of 3D photography is
plausible. 
But for me I think the illusion-breaker is the absence of motion
parallax in conjunction with my head movements.  If a scene in the
viewer gives me a strong sense of spatial reality, the first thing I
intuitively want to do is move my head up and down, side to side,
tipping left and right to reinforce the spatial information, and to
flesh out what I call "singletons" - objects which are visible in one
eye's view but not the other, which sometimes cause discomfort or
rivalry.

This "static" viewing condition which is not bothersome to me in 2D
photos becomes so in 3D - *sometimes* - because the "reality"
expectation has been raised without being completely satisfied.  To
see an apparently real scene, but frozen in space and time can be
actually unnerving - more so than in a 2D shot where "the willing
suspension of disbelief" is more an accustomed part of the experience.
 The particular subject in the picture plays a part of course, and
time spent viewing 3D photos lessens the problem - glassy water and
frozen motion don't bother me as much as they once did. 

This relates to a concern I have about 3D Imax, which I've not seen
and our local dome unfortunately can't do.  (A retrofit = approx $3
million per the director there.)  I have always enjoyed moving my head
and body around at Imax shows to enhance the sense of moving through
space.  Our local theatre always leads off with a helicopter ride over
Milwaukee.  If I sit forward on my chair, lean into turns, scan up and
down, cock my head and rotate my waist, the
inner-ear-peripheral-vision-stereo-sound effect can be a real thrill,
a total body adrenaline rush.  But I imagine that 3D goggles prevent
that.  Unless I missed something, I'm guessing that the 3D requires me
to sit upright and face essentially front and center, like a good
pupil. Am I assuming correctly?  Anybody else bothered by the trade-off?

Bruce

  
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