double 0 0 double s x s s double x half 0 0 half s 0 0 half s s x s half x - x 0 x - s x s y - x y if 0 y z y if s x y z z half double x x double 1 0 0 s 1 half 1 - 2 if 3 FULL ./TRS/SK90/2.14.trs