Re: Discounting the joy of Pulfrich 3D

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Sun, 8 Jun 1997 
>From: P3D Scott Langill comments:
>
>In response to:
>
>> Am I the only one that did not "discover the joy" of Pulfrich 3d and
>> did not find it "amazing and effective effect" when seen for a first
>> time? In my first Pulfrich experience I had to convince myself and
>> the others around me that we were seeing 3d... -- George Themelis
>
>     I wholeheartedly agree. In a sense you were seeing an illusion of
>depth, but you were not seeing depth or 3D...............
>
>............... Enter the Pulfrich Effect, no special cameras, inexpensive
>dark and clear glasses, a suitable 2D appearance (with no "fringes" at
>all), a promotable (albeit unreal and non-stereoscopic) "3D" effect, and
>an accepting audience.
>
>     It is unfortunate that a group as influential as the readers of and
>contributors to the photo-3d mailing list and 3D Frequently Asked
>Questions file are so enthusiastic about the use of the Pulfrich Effect
>on television. It would seem apparent that bandwidth would better be
>spent attempting to convince television networks and producers to use
>the available and true stereoscopic techniques.
>

*******  If you read some of the previous discussions relating to this topic
you will find that the long time readers of this list not only know all the
information about Pulfrich effect but also believe it to be a form of true
stereoscopic effect. 

The time lag created by the combination of one dark lens and normal human
bio-physiology results in a true stereoscopic disparity or parallax. Stereo
vision happens in the mind, not the eyes. Any method of generating a real
disparity qualifies as stereoscopic.  

You are right that it is totally dependent on motion, relative horizontal
motion, and that is why so many of us were disappointed in the NBC show. It
didn't use as much relative motion as was available to the subject and the
presentation.

Larry Berlin

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


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