These are some interaction concepts for the second prototype scene. The first diagram is based on the flow between scenes. The second is based on the afforded interactions in a scene. Its really just triggering events based on the users position. Each user is assigned a collider and each event is a collider. When the user steps in a position occupied by a collider an event is triggered. In this case the trees pop up in the scene or shrink when the user hits the trigger point at the back.