InitScript
Bring a scene to life when you press Play: move things every frame, make new instances, or drive a whole video from code.
An InitScript runs in Play mode (F5) and in renders, never in Edit. Connect to Root.Heartbeat to run every frame; Stop disconnects everything and puts back what it changed. Directly under a CookVideo it may return function(time): the video calls it once per frame with its time, in Play, renders and exports, so it must depend on time alone, and it draws the video's picture layers itself.
