Photosynth: view your world in 3D from your 2D pics
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Photosynth creates an amazing new experience with nothing more than a bunch of photos. Creating a synth allows you to share the places and things you love using the cinematic quality of a movie, the control of a video game, and the mind-blowing detail of the real world.
In simple terms, Photosynth allows you to take a bunch of photos of the same scene or object and automagically stitch them all together into one big interactive 3D viewing experience that you can share with anyone on the web.
Check out the Pyramid du Louvre:
More info at: http://photosynth.net/