I' ve seen something that included a slide projector and a special
slide. If you have a  black slide with maybe 100 horizontal horizontal
line openings and you project this slide onto your object which stands
before a wall you will get several bright lines on your object (they
used a face) and on the wall in the back.
You can use the parts of the bright lines that show in the back as
reference for a program that calculates the 3D position of the lines on
the object.

In a way this is also a 3D scanner, but a low cost one.

Maybe somebody else has the link for this available.
This slide and the software was a bonus for a modeller (I think for
POVRAY) they sold ; (  .

--
Marc Schimmler
Institut fuer Computeranwendungen
Universitaet Stuttgart

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