GetMoveDelta( <anim>, <start time>, <end time> )
Module: Animation
Summary:
Returns the movement vector difference in the given animation
Required Args:
1 : <anim> An animation
Optional Args
1 : <start time> The start time as a fraction of the total animation time, from 0 to 1
2 : <end time> The end time as a fraction of the total animation time, from 0 to 1