The best thing that came out of the last generation of consoles wasn't actually a video game, it was Kinect. Microsoft shipped millions of units of this weird sensor, and then hardly anybody made games for it. But hackers and roboticists turned Kinect into a whole giant leap for machine vision.
Now it's time for another hacker-led breakthrough, and this time it's all about precision. The HTC Vive does positional tracking with two IR-blasting "Lighthouse" boxes, and an assortment of photodiodes on the VR headset and controllers. Based on the timing of the IR hits, and the information the Lighthouses encode in their blasts, you can get ultra-precise positional coordinates in 3D space (x, y, and z) of the photodiode in question.
Trammell...
Someone's already using Vive's Lighthouse for DIY positional tracking
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