OptionalmixerThe AnimationMixer, should be shared with the animator if an animator is bound
OptionaltargetThe object that is being animated.
You can use the weight to blend the timeline animation tracks with multiple animation tracks on the same object.
A TrackHandler is responsible for evaluating a specific type of timeline track.
A timeline track can be an animation track, audio track, signal track, control track etc and is controlled by a PlayableDirector.