@fivestar The shortest rotation is used by default. The ShortestRotation property just defines whether the shortest rotation is defined once at the start of an animation mix, or whether it's always re-evaluated, thus leading to potential change in direction midway. See the documentation text:
If true, mixing rotation between tracks always uses the shortest rotation direction. If the rotation is animated, the shortest rotation direction may change during the mix.
If false, the shortest rotation direction is remembered when the mix starts and the same direction is used for the rest of the mix. Defaults to false.
