Toggles
(f) (f)reeze/unfreeze rotation
(t) start/stop (t)eacher
(s) start/stop (s)tudent
(0) main camera
(1) teacher shoulder
(2) teacher upper arm
(3) teacher lower arm
(4) student shoulder
(5) student upper arm
(6) student lower arm
(v + 1-6) view from joints
(c + 1) place camera center on student
(c + 2) place camera center on teacher
pendulum's omega(w):
w1
w2
w3


student sensitivity:
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