Head Tracking with Cliffs of Dover

[MadBlaster]

To clarify what I was thinking. In a reflective setup you would use reflective tape instead of LED's in your headset. The light source would be at the camera. That's the direction I thought SpecJock was going in his comment. So, you would not want to use infrared led under that design, because it would be pointed towards you instead of away from you, and you would get eye damage.