PoseEasingDirection

When a Pose has an EasingStyle which is not symmetric, the EasingDirection determines if the curve is applied from previous keyframe to next, next keyframe to previous, or in both directions by using two copies of the curve back to back. For the symmetric Linear and Constant EasingStyles, this property has no effect. For legacy compatibility reasons, the use of In and Out are backwards from how these terms are used by most other animation tools and by TweenService.