# Main Topics

• Scene state machine
• Separation of concerns (MVC)
• Drawing to the screen
• UI layout and screen size independence (anchors)
• Model, World, Camera, Screen space
• Scene hierarchy
• Screen, Camera, World, Model space (picking)
• User input
• Event handling v polling
• 3-tiered architecture
• Collision detection
• Physics
• Gravity
• Rendering Improvements