Making the story interactive

So far, we used the Timeline to drive our entire VR story experience from start to finish. But in fact, Timelines are a playable asset like others in Unity. For example, if you select the BlackbirdDirector object and look in Inspector at its Playable Director, you'll see it has a Play On Awake checkbox, and it's presently checked. What we're going to do now is not play on awake, but rather start playing on a user event, namely looking directly at the small tree for a few seconds. And when the story ends, it resets itself.

Look to play

First, we'll add a LookAtTarget encasing the small tree and then use that to trigger playing the timeline:

1. Select the BlackbirdDirector and uncheck the Play On Awake checkbox
2. For reference, set the Tree game object Scale to its starting keyframe Scale (0.1, 0.1, 0.1) 
3. In Hierarchy, create a cube (Create | 3D Object | Cube) and name it LookAtTarget
4. Scale and place it to encase the small tree, Scale (0.4, 0.5, 0.4), Position (0, 0.3, 0...