Implementation of the Scene Graph
The game will be rendered in retained mode, with the scene graph constructed
in code. The graph starts with a World object that contains
two cameras. The first one will move with the player, and the second one is
fixed on top of the maze. The background contains an image with a star field.
The rest of the components are geometrical objects, all of them rectangular
planes. That includes the floor, the walls, the location square, and the start
and end marks. Each object includes an appearance. Notice that there are no
lights in the world as the appearance is just made by textures rather than
materials.
The end mark mesh contains an animation track that updates its position
up and down the y axis. Every time the scene is rendered, the time is increased
and the World's animate method is
called to advance the animation.
The figure below shows a diagram of what the scene graph looks like,
starting from the World object.
