Free-track IR 2 DOF?

[Blackdog_kt]

It doesn't matter whether you can see IR or not. What matters is that reflectors need something to reflect.

The trackIR camera has a built in emitter, so it's both an emitter and a receiver. Freetrack cameras however mostly function as receivers only, because they lack built-in LEDs.
MSPaint to the rescue:

[julian265]

Yes I'm aware of how it works - but what's stopping you from buying some IR LED's (the same as I use on my headset), positioning them near your camera and pointing at you, and using the same sort of reflective material as TIR does to reflect the light back to the camera?

Most freetrack users make their own system anyway, so is there anything that I'm missing that's stopping them from doing it this way? It's easier to do with regard to avoiding extra wires running to your head.

[Blackdog_kt]

Yup, if you position LEDs near the camera i think there's nothing stopping you from using reflectors.

[swiss]

Originally Posted by Blackdog_kt

Yup, if you position LEDs near the camera i think there's nothing stopping you from using reflectors.

There are (standard)webcams with integrated IR LEDs on the market.