Yes, I have used TrackIR. It's just an IR camera and some IR LEDs. My laptop has both of those built-in. It just seems odd that with nothing more than that, plu

Yes, I have used TrackIR. It's just an IR camera and some IR LEDs. My laptop has both of those built-in. It just seems odd that with nothing more than that, plus a trivially cheap pair of shutter glasses, I could achieve the appearance of a full holographic display - and this isn't already mainstream. Or even widely demoed. Or even, apparently, a little Github repository somewhere. And yet it's apparently widely used in medical imaging. What gives?