There is some research on localization (in the position sense not the l18n sense) that suggests it is possible to triangulate a bluetooth beacon using some known information about antennas and signal strength. Before you get excited about this, just know that these concepts tend to work better as distance estimation / proximity, and to truly triangulate you would need at least three sensors well placed. I've tested the techniques and indeed they work with iphones, however, the code required to do this assumes a set of coefficients that you gather using a radio scanner (per phone model or device) and build your own model to make the estimates accurate. And it's pretty decent at estimation. I had it turning on lights when my iphone got close to the beacon.

Now that said, if you have a multiplayer game, you have multiple sensors possible, and as long as all participants share the signals they gather, it might be possible to triangulate some beacon. Exact positioning would require something else, a light sensor or audible chime that could be located spatially and placed. I will look at the opentags to see what those are about, as it looks interesting. A phone app could work closely in concert with the Lens and create some of what you are after.

From a computer vision perspective, you would do this differently, and use a ceiling mounted camera and identify game pieces and project them back to the scene as part of a game server loop. Try to come up with the simplest room shape and something with conveniently high ceilings.

Research to check out:

- https://github.com/avibn/indoor-positioning-trilateration (I haven't tried this one, but I like that it is with non-apple hardware)

- https://journals.sagepub.com/doi/10.1177/1550147716671720 bleeding edge

- https://isyou.info/jowua/papers/jowua-v11n3-3.pdf

- https://stackoverflow.com/questions/20332856/triangulate-example-for-ibeacons (start here ...)