Beginning Game AI with Unity: Programming Artificial Intelligence with C#

Table of Contents....5

About the Author....7

About the Technical Reviewer....8

Acknowledgments....9

Introduction....10

Chapter 1: Introduction....12

1.1 Artificial Intelligence....12

1.1.1 Intelligent Agents....13

1.1.2 AI in Video Games....15

1.2 Unity....18

1.2.1 Installing Unity Hub....19

1.2.2 Activating Your Unity ID and License....20

1.2.2.1 Manual Activation....24

1.2.2.2 Guided Activation....27

1.2.2.3 Installing Unity....30

Chapter 2: The Basics....34

2.1 Vectors....36

2.1.1 Addition....38

2.1.2 Subtraction....39

2.1.3 Scalar Multiplication....40

2.1.4 Dot Product....41

2.2 The First Project!....42

2.2.1 The First Scene!....46

2.2.2 The First Script!....48

2.2.3 Moving Toward a Point....53

2.2.4 Steering Behaviors....58

2.3 Test Your Knowledge!....61

Chapter 3: Paths and Waypoints....63

3.1 Graphs....63

3.2 Waypoints....67

3.2.1 A Simple Path....68

3.2.2 A Labyrinth!....75

3.3 Breadth-First Search....92

3.4 Exercises....101

Chapter 4: Navigation....102

4.1 Weighted Graphs....102

4.2 Navigation Mesh....106

4.3 A Star for Navigation....117

4.4 Programming Agents....119

4.5 Test Your Knowledge....124

Chapter 5: Behaviors....125

5.1 Guards! Guards!....127

5.1.1 Field of View....127

5.1.2 Agents, Behave!....131

5.1.3 Chase!....137

5.1.4 Investigate!....139

5.1.5 Patrol!....140

5.2 *Knock-Knock* – Who’s There?....143

5.3 Goodbye, AI....147

Index....148

Game developers will use this book to gain a basic knowledge of programming artificial intelligence using Unity and C#. You will not be bored learning the theory underpinning AI. Instead, you will learn by experience and practice, and complete an engaging project in each chapter.AI is the one of the most popular subjects in gaming today, ranging from controlling the behavior of non-player characters to procedural generated levels. This book starts with an introduction to AI and its use in games. Basic moving behaviors and pathfinding are covered, and then you move through more complex concepts of pathfinding and decision making.

What You Will Learn

• Understand the fundamentals of AI
• Create gameplay-based AI to address navigation and decision-making problems
• Put into practice graph theory and behavior models
• Address pathfinding problems
• Use the A* algorithm, the deus ex machina of pathfinding algorithms
• Create a mini stealth game

Who This Book Is For

 Developers and programming enthusiasts with a basic knowledge of Unity and C# who want to understand and master the foundations of artificial intelligence in games