Lesson 7: How AI is Used in Games: Creating Intelligent Opponents

Learning Objectives Define what a Non-Player Character (NPC) is and explain the role of AI in controlling its behavior. Identify and describe at least three common behaviors for game AI, such as patrolling, chasing, and fleeing. Use 'if-then-else' statements to create a simple decision-making process for a game opponent. Explain the concept of a 'State Machine' in the context of an NPC's behavior (e.g., switching between 'patrolling' and 'chasing' states). Design a simple 'Sense-Think-Act' cycle for a game character on paper. Analyze a simple game scenario and predict the AI opponent's actions based on a given set of rules. Ever wondered how the computer-controlled characters in your favorite games seem to know exac...

TermDefinitionExample Non-Player Character (NPC)Any character in a game that is not controlled by a human player. Their actions are controlled by the computer's code (the AI).The Goombas in Super Mario, the villagers in Animal Crossing, or the enemy guards in a stealth game. Game AIThe code and logic that determines how NPCs behave and react to the player and the game world. It's about creating believable and challenging behavior, not true intelligence.The code that makes a dragon breathe fire when the player gets close, or makes a race car opponent try to avoid crashing. State MachineA model for an NPC's behavior. The NPC can only be in one 'state' (or mood/activity) at a time, and it switches between states based on rules.A guard might have three states: 'P...

The Sense-Think-Act Cycle 1. SENSE: Gather information about the game world. 2. THINK: Use rules to decide what to do. 3. ACT: Perform the chosen action. This is the fundamental loop for almost all game AI. In every moment (or 'frame') of the game, the AI runs through this cycle to seem alive and responsive. For example, a zombie 'senses' the player's location, 'thinks' about the best way to get there, and 'acts' by moving one step closer. Conditional Logic for Decisions (If-Elif-Else) if (condition is true): do_action_A elif (another_condition is true): do_action_B else: do_default_action This is the primary tool for building an AI's brain. You use it in the 'THINK' part of the cycle to check conditions (like...