anglebetween

double AngleBetween (object obj_0, object obj_1, frame time_0, frame time_1)

Return Value: angle in radians between the two items relative to their parent space.

Arguments:

obj_0	first object
obj_1	second object
time_0	time at which you want to take obj_0's position
time_1	time at which you want to take obj_1's position

Get the angle in radians between two objects and their parent's origin (parent space).