What's the small box controlling? FOV?
The small box controls the range at which the camera will start moving forward into the scene, and the range at which the camera will pull back out of the scene.
The large box controls the maximum range that the camera will move side-to-side.
The front sphere controls the maximum amount that the camera will pull into the room.
The other spheres are just guides to help me see the camera's behaviour during development.
I'd love to see how it acts in more complex scenes or places where the player gets closer to the camera or front wall.
I imagine that I'm going to have to switch between camera types on the fly in order to navigate more complex spaces. In this scene you simply can't walk very close to the front wall, of course that won't work everywhere.