Face ID makes use of a front-facing IR sensor and dot projector. I hope those sensors make their way to the back of smartphones too. Could enable some very neat apps.
I predicted 3D sensors coming to phones a few years ago, but what I got wrong was that they ended up on the front, not the back. I do hope they make their way to the back as well. If they can do it with a big enough distance cutoff to work in any average sized home room, ARKit will look like a stupid toy in comparison.
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