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Rendering Pipeline:

1. Greenfoot will call the act() of the world.
2. A Camera's renderToBuffer method will be invoked.

Camera2D Rendering Pipeline

1. The main Camera2D of a Scene will fetch all GameObjects from that scene.
2. Only GameObjects with a PolygonRenderer will be rendered onto the buffer (by raster rendering).
3. The buffer is then drawn as the background to the screen.

GameObjects can have components associated with it. A component must implement the IComponent interface. Components by themselves don't do much. They only store information about the GameObject (for now).