P3D Re: Question about convergence angle

[Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Sat, 6 Dec 1997
>From: "Dr. George A. Themelis" writes:
>
>>the taking geometry as described by either a ratio of
>>base to distance or the convergence angle, would enable the beginner to
>>duplicate the images pretty closely and feel confident in the process. 
>
>Larry, I have a question:  When you talk about convergence angle,
>which angle do you mean?  Each object is at a different distance
>from the lenses, hence it comes with its own convergence angle.
>D you want to see the convergence angle of the nearest object
>specified, or the convergence angle range of the entire scene?
>
>George Themelis


That's a factor that needs worked out each time. For pictures of people or
nearby objects, the answer is obviously the primary subject depth. Even
scenes without a specific nearby subject can be described as having some
sort of center. 

Yes there would be many different angles for objects throughout a scene. I'm
referring to a localized-average angle between each lens and a primary scene
center or subject depth, the same place where you might center your DOF.
Something fairly simple and easy to remember or use.  I don't know if the
angle is easier to work with or the base to distance ratio. They both
describe useful aspects of a triangle which is easy to visualize. Are there
other names for the convergence angle, or the base to distance ratio? 

And include hypo and hyper wherever a specific direction is desirable or
sufficient information. :-)

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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End of PHOTO-3D Digest 2442
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