Re: How to fool people with 3d

[P3D John Bercovitz <bercov@xxxxxxxxxxx>]

I think accommodation is not such a good clue by itself but in 
conjunction with occlusion, it could be a pretty good clue.  If 
you focus on one object and that object occludes another object, 
the degree of lack of focus of the occluded object would be 
related to the objects' separation in depth and the pupil diameter 
of the eye.

I am surprised to hear from John R that vergence is such a good 
depth clue when papers and lore of researchers seem to indicate 
otherwise.  Perhaps we need to do our own experiments here on P3D?  
I think vergence has always been considered a fair depth clue out 
to a few feet but not beyond.  I would love to hear of proof that 
this is not so.  Conflict of vergence and other stereopsis clues
occurs when film chips are badly spaced.  If they are very badly
spaced, it's obvious because things look too big or too small.

Another problem with the pair of peepholes is that they'd have to 
small so that a person couldn't move his head and still look 
through them else he obtain information from motion parallax.  Not 
much maybe; probably the most important information he would get 
would be that he was not looking a stereo pair.

John B


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