P3D Re: barrier grid review

["ron labbe" <ron@xxxxxxxxxxxx>]

[Sorry for the triple quotes, Bob W]
>>>Unfortunately, this autostereogram suffers from the usual symptoms of this
>>>format: double images and pseudoscopic positions...

>>It would be interesting to get some more reviews on this specific issue,
>>correlated with the interocular of each reviewer. :-) <

>I also moved toward and away from the image with no improvement. 
>The angle of view is more relavant than interocular distance. Eh?

That *sounds* reasonable, but I'd hate to commit to it without consulting
a geometry book. :-)

I believe lenticular and barrier strip-type displays are usually made with
a particular interocular in mind. At least some displays of this type have
"sweet spots", where the effect looks unusually good, and other locations
where the results are much worse (as you referred to pseudoscopic
positions). In your original post, did you mean that there are spots from
which the picture looks *bad*, or that you could not find any spot from
which the picture looks *good*?

If you meant the latter, then interocular might have an influence. I believe
the interocular affects the positioning (including distance from the picture)
of the "sweet spots". If you are not infinitely far from the picture (a good
assumption), then each eye will see different parts of the picture from
slightly different angles, in a non-linear relationship with position on the
picture. I am not aware of any display of this type that attempts to exactly
compensate for this disparity, so visible artifacts can result. But people
with different interoculars might see artifacts to a different degree.

Did you by any chance try rotating the display within the viewing plane?
That would induce some artifacts, but might eliminate others.

John R


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