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"That China has everyone's face 3D scanned by now (multiple photos from multiple angles), everyone's voiceprint, everyone's IP, transcripts of what was said and by who" As a native Chinese, I haven't been scanned by 3D scanner. How do you get this conclusion?

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Presumably they mean that if you use your web cam with zoom they would be able to construct a 3D model of your face from the camera feed as you move your head around.

You don't need a 3D-Scanner for that, just a moving head and some minutes/seconds of video-material.

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