The only one lucky enough to have seen this is Mystipuma, when he happened to catch Oleg Maddox and Ilya Sevchenko in a flight sim conference.
There is a video of him asking them questions and they demonstrate some of the early work on BoB (like the videos we have on the bonus 1946 DVD). At some point, Oleg Maddox displays the use of 6DOF tracking, but since the video is taken with a handycam in an environment with lots of ambient light sources, there's unfortunately not much you can see. It is still interesting nevertheless.
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