Re: 3d bear mystery

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Sun, 8 Dec 1996 22:54:30 -0600
>From: P3D bob wier <wier@xxxxxxxxxxxxxxx>
>
>>...................(someone's question)............... Did you
>>also swivel the object?
>
>As I said, beats me! I don't recall intentionally rotating it - it only rests
>3 points on the glass, and I definitely did not hold/prop it up so that
>it would be differenctly oriented in the two shots. If I get a chance, I'll
>try to duplicate it again and see what happens (I should have taken notes!).
>
>--BW
>

I can see a shift of perspective from edge to edge within each image as if
the viewpoint is relatively fixed somewhere aligned with the left edge of
the image and a significant distance away. Since that change in perspective
takes place within one image, it stands to reason that shifting the object
(without rotating)  further in from the leading edge provides the perfect
change of perspective for a stereo pair. In the single camera *weight-shift*
technique, you have the option of either moving the camera or the object. In
this case it was the object. 

All you lucky folk with scanners have a bonus built-in stereo camera, you
didn't even know was there!!! It's specific to a small scale of fixed
objects but that could still be useful. The already digital results can go
right onto web pages or into documents with the new 3D printing inks.
They're supposed to work in many of the existing printers and photocopiers!
Sounds like fun to me! That ink should be out sometime soon, shouldn't it?

I guess the *scanning* process takes place through an optic system similar
in effect to a camera lens. I wonder if most scanners work in the same way?
Is this due to hardware factors or is it designed into processing software?
(like ray-tracing?) I believe photo copiers work differently, they seem far
more glass-plane dependent. (shallow DOF)

I wonder what color of protective eyewear would be recommended for taking
stereo portraits in the flatbed scanner? What is the precise nature of
scanner light? What effect on biological systems, including the face with
eyes closed or small pets... 

Larry Berlin

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


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