[photo-3d] Stereo Shadow Trick?

[Michael Georgoff <Michael_Georgoff@xxxxxxxxxxxxxx>]

Can someone explain the stereo shadow trick to me?   Something in my foggy
memory suggests maybe the scene is flat but the shadows are in stereo?  Am I
hallucinating again?

Something like this: Take left shot of a chair on the patio on a sunny day.
Let time elapse, so sun moves, hence shadow moves.  Take right shot from
exact same camera position as left shot was done before time elapsed.  Now:
scene is flat but shadow is in stereo?  This is from memory.  Elapse = how
long in time or shadow inches? Do I need to get out my slide rule to
calculate MAOFD of shadow?

Anyone know of any examples posted on the web maybe??

Thanks,

Michael Georgoff
Shadowy San Jose, CA