We built these in the early days of developing our head tracker. You can see three small IR lights mounted on the frame which made it easy to track the head's location in space. We used it to emulate a near-perfect head tracker which allowed us to achieve two important goals:
- Unblock teams that need a working head tracker immediately.
- Learn how close to perfection we had to be in order to reach shippable quality (our exit criteria). Because we started with a near-perfect signal we could insert synthetic noise and latency in a controlled manner to measure how it would impact the user experience.
I prefer to think of this photo as me keeping a close eye on Jeff but it was really the other way around!