Here is a quick video of the program being used in the Game IL 2 - Battle of Stalingrad
This video uses 4 points to determine headpose.
Headtracker.IL2.mp4
Here is an earlier video which used 3 points. The game here is war thunder.
Headtracker.Warthunder.mp4
It must be noted that this headtracker sends the head pose data to "OpenTrack" which can be found here https://github.com/opentrack/opentrack
The head tracker is only used to determine head pose. Whats the head pose has been found, the data is send to opentrack via udp and from there, open track smoothes out the values and send the smoothed values to the game.
Before are the some pictures of what my hardware looks like. It is merely a prototype so dont think much of it.
The 3 point version will simply have thesame 2 base leds with one top led in the center.