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Here are two ways of building a 3D scanner with a webcam and a laser !
This article from TechRadar is one, and this article from Instructables is another.
DAVID is indeed a nice software, even if a lot of tweaking is involved : finding the right webcam-objet-laser angle, build a good calibration corner, and so on.
You have to be patient, but it’s worth it !
The official forum ( http://www.david-laserscanner.com/forum/ ) is amazing, some users get some astonishing results. (take a look at “Hal”‘s work ! ).
By the way, I wrote a review of DAVID on tdt3d.com (in French only ) :
http://www.tdt3d.com/articles_viewer.php?art_id=130
There are several pictures of models I scanned using a cheap 20€ webcam.
Thanks a lot for these links Benoit, the results are indeed really impressive !