P3D 3d shadows (3d images of impossible things)

[George Themelis <gthemelis@xxxxxxxxx>]

>The idea is to move the shadow between the two
>images so it is standing in space in the final stereopair. 

As I said earlier, "nothing new under the sun".  I first became
aware of this trick from a German book (which I owned but had
forgotten about it until Ron Labbe mentioned it in the list)
which shows an anaglyph of a chair in which the shadow of the
chair was sticking out of the window, coming towards the viewer.

When the subject in Detroit was "shadows", I tried to reproduce
this effect by photographic a small Greek statue of a person
riding an whatshouldIcallit (people called it bicycle rider).  I
used a flash and shifted the flash between exposures.  My first
thought was to shift both flash and camera.  I think at the end
I only shifted the flash.  The challenges were to shift by the
right amount and in the right direction to create the
appropriate stereoscopic deviations (not too big, not too small
and in the horizontal direction ONLY) for a good stereo effect.

Given that I took the final images the morning before the
competition, it worked reasonably well.  I had the clever idea
to turn the image upside down (i.e. have the shadow up instead
of down) because it looked better in the viewer.  It looked a
little confusing in projection.  The judges had no clue what
they were seeing and I forget the final score.

If I had more time I would have experimented with colored
backgrounds and colored lights... but I have left it there.

George Themelis


=====
George Themelis, DrT-3d@xxxxxxx
http://home.att.net/~drt-3d/
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