Stress Level Zero’s Brandon J Laatsch described inside-out body tracking as “the most game changing feature of VR hardware since tracked controllers in 2016”, and said “Other hardware players either need to step up and develop it or concede the space to those who do because it will create an insurmountable divide.” […]
IOBT shipped in December. However, almost a year later it’s still only used by a tiny handful of standalone apps, including Swordsman VR, Drunkn Bar Fight, XRWorkout, and FastHands. In fact Meta’s own new avatar system doesn’t even use IOBT.
I guess it mostly means elbows. I’ve also heard that upper body tracking could be used for something like walking direction, but afaik not a single game is actually using that (there’s 3 or 4 games that use upper body tracking at all).