P3D Re: shadow in 3D

[Paul Talbot <ptww@xxxxxxxxx>]

ron labbe wrote:
> 
> Dr T writes:
> >>Shadows?  I would have never thought of taking a picture of a
> shadow in 3d.
> 
> A book by the German Hans Knuchel contained a VERY interesting shadow
> image in stereo: Left image of a chair with shadow; Right image
> without moving camera, but introducing parallax in shadow by moving
> light source! VERY clever stereo image...

Ron, can you describe what the effect was?  I did a shoot-and-shift
hyper shot once, bracketing the stereo base, where about 20 minutes
elapsed between the first and last shots.  (The wind was intermittent
and I was trying to get two shots with the flags still, and certain
other potential distractions eliminated.)  When I viewed the results
I realized I had forgotten to anticipate the effect of the rotation
of the earth!  Shadows of trees had moved, and when viewed in 3-D
appeared to float above the ground.  Some people didn't notice it
unless I pointed it out, however.

Paul Talbot


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