Kinect can’t recognize if player showing back or front,
but normally, human can’t(or don’t) twist their head to waist by 180degree.
So, I thought it can be corrected with head angle and foot angle.
1.correct(rotate 180deg) waist angle compare to head angle
2.correct feet left and right(and angle) compare to corrected waist angle.
foot(or leg) can see opposite to waist, but it might upside down then.
just an idea. it might be a bullshit, but please regard it.