Yes, I have. They work pretty darn well. I even used the FaceTrackNoIR application which uses a bog standard webcam with face tracking, which worked fine when I didn't have a beard, but beard or glasses screws it up. You need a high frame rate camera to make it work, the Sony PlayStation Eye (60 fps, you can disable vsync, can be found cheap second hand) is a popular choice.
On my TODO list is building a DIY head tracker to be used with FreeTrack or other open source tracking solutions (forgot the names). I have an extra PS Eye waiting for that but I'd need to obtain some CCTV lenses (without IR filters) for that.
I don't think you have any chance of survival without a TrackIR or an Oculus in online combat flight simulators against guys who have one. Situational awareness is everything in dogfighting.
Okay, just wanted to be sure because you're absolutely right that they're practically a requirement.
Definitely build yourself an IR tracker. Should cost you less than $10 in components and it works far better than face tracking. FWIW, the FaceTrackNoIR+point tracking plugin > FreeTrack (the latter hasn't been updated in years and the former plugin is based on FreeTrack's codebase).
On my TODO list is building a DIY head tracker to be used with FreeTrack or other open source tracking solutions (forgot the names). I have an extra PS Eye waiting for that but I'd need to obtain some CCTV lenses (without IR filters) for that.
I don't think you have any chance of survival without a TrackIR or an Oculus in online combat flight simulators against guys who have one. Situational awareness is everything in dogfighting.