>>361473489
Yes, 1 on each foot and one on the hips.
Then the computer guess what you are doing moving your feet.
Knees are not tracked and look fucked up when the computer guesses wrong.
Imagine you see a person in the dark with a light on each foot, each hand, and his hip and head.
You can guess how he is moving, but you have no idea how the knees and elbows bend.