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Gets the LEAPMOTION sensor fingers data from a hand with finger joints positions.
fun [ObjLeapMotion I I] [[[F F F] [F F F] [F F] [[F F F] r1] I] r1]
Return : [[[F F F] [F F F] [F F] [[F F F] r1] I] r1] list of fingers position, orientation, screen pos, joints positions list and id or NIL if an error occurs.