You can learn all about the different 3D scanning technologies - laser, infra red and structured light. Structured light is the technology DAVID VISION 3D scanners uses which has a very big advantage in speed and the DAVID software provides accuracy.
This video mentions the downside of structured light that it cannot scan shiny or dark objects, but actually if you spray white powder like Magnaflux Spotcheck or even Athlete's foot spray like this one onto the object, you can scan any object perfectly! Once you're done with the scanning, you can just easily wash the white powder off.
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