for context, in case you didn't know: these only work on a CRT, because they actually use the timing of the electron beam going across the screen to measure where it's pointing
@bonzoesc if you're able to minimize other light sources it's fast and reliable
@noiob yeah; the htc vive tracking uses that, and the few times i've used it i haven't gotten sick from the visuals disagreeing with priopriception
@noiob it's funny how everything old becomes new again; the tracking and timing of beam sweeps to establish spatiality is used in some modern VR stuff too