[Nursie]

Yeah you could definitely have a go.

Where is the exact line - i.e. can you use Lidar? Infrared depth-sensing? Or do these provide too much data such that the scene could be recreated?

(I'm exploring this as a thought experiment, in general I agree that people shouldn't be carrying hidden cameras on their faces, and if those cameras are at all connected to Meta then it's much worse!)

[wolvoleo]

Well lidar in that form factor would end up just being an 8x8 laser DoF sensor like some smartphones have. There's no space or power budget for a real lidar.

That would be ok I guess. That's not enough to capture much of anything even with a continuous feed.