T3D Re: Re stereo math

[John Bercovitz <bercov@xxxxxxxxxxx>]

>I hope I have not offended anyone by being brief or using peculiar
>English, I have learned that tempers sometimes are inconstant on these
>lists :-). I appreciate also the ideas which I oppose to.

I don't think it's peculiar English.  Instead, this may be an excellent
example of why tempers flare:

>Here one of the presumptions from maofd.txt is repeated. It is false.

And also:

> The maofd theory seems to ignore viewing :-). 

But regardless of unfortunate phraseology, you're spot on.  The maofd 
theory says up front it ignores viewing by positing that viewing and 
taking lenses are equal.  It has been my hope for some time that I would 
be able to quantify the effect of changing viewing distance by experiment 
and then possibly come up with an hypothesis for discussion.  So far, not 
enough time.  However, by experiment, maofd holds up extremely well when 
viewing and taking lenses are the equal.  Mannle held that the viewing 
distance was irrelevant to the first order and I think it is indeed a 
weaker effect but we won't know how weak until someone does experiments.

>Mounting and projection system should be defined before spreadsheets are
>designed. 

Yes, and they were, see above.

> I'm working on longer text that will discuss maofd. 

I look forward to it with great enthusiasm.  If you have any questions
about maofd, don't hesitate to contact me or Steve.  That way you and
we won't have to waste time arguing about misunderstandings of mafod.
Better to spend the time on real differences than imagined ones, yes?

>My theory is that masking off the lateral field of view in hand viewing
>is most important, probably enhanced by relatively high luminance.
>In projection the screen image necessarily is less bright, and pola
>filters cut more light. The projection room is inevitablely lit by the 
>screen, so is noticeable in the perifery of the visual field.
>This is a theory which could be tested for example by deteoriation of
>viewer images. I have not done it yet, altough I have had this theory
>for some time...

Sounds like a very promising theory to me.  Please let us know about your 
experimental setup and your results.

John B



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End of TECH-3D Digest 356
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