Wow, an incredible Instructable fromKyle McDonald:

The same technique used for Thom’s face in the Radiohead “House of Cards” video. I’ll walk you through setting up your projector and camera, and capturing images that can be decoded into a 3D point cloud using a Processing application. Most 3D scanning is based on triangulation (the exception being time-of-flight systems like Microsoft’s “Natal “). Triangulation works on the basic trigonometric principle of taking three measurements of a triangle and using those to recover the remaining measurements

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