Chapter 1, Introduction to AI, talks about what Artificial Intelligence is, and how it is used in games. Also, we talk about various techniques used to implement AI into games.

Chapter 2, Finite State Machines, discusses a way of simplifying how we manage the decisions, which AI needs to make. We use FSMs to determine how AI behaves in a particular state and how it transitions to other states.

Chapter 3, Random and Probability, discusses the basics behind probability, and how to change the probability of a particular outcome. Then we look at how to add randomness to our game to make the AI less predictable.

Chapter 4, Implementing Sensors, looks at where we should make our character aware of the world around them. With the ability of our characters to see and hear, they will know when an enemy is nearby and will know when to attack.

Chapter 5, Flocking, discusses a situation where many objects travel together as a group. We will look at two different ways to implement flocking, and how it can be used to make objects move together.

Chapter 6, Path Following and Steering Behaviors, looks at how AI characters can follow a path provided to reach a destination. Then we look at how AI characters can find a target without knowing a path, and by moving towards a goal while avoiding.

Chapter 7, A* Pathfinding, discusses a popular algorithm, which is used to find the best route from a given location to a target location. With A*, we scan the terrain and find the best path that leads us to the goal.

Chapter 8, Navigation Mesh, discusses using the power of Unity to make pathfinding easier to implement. By creating a Navigation Mesh (this requires Unity Pro), we will be able to represent the scene around us better then we could using tiles and the A* algorithm.

Chapter 9, Behavior Trees, expands upon Finite State Machines into something we can use for even the most complex of games. We will be using the free plugin Behave to help us create and manage Behavior Trees in Unity.

Chapter 10, Putting It All Together, takes various elements of what we have learned throughout the book and putting together one last project. From here you will be able to apply the remaining AI elements we learned and create an impressive vehicle battle game.

The main requirement for this book is having Unity Version 3.5 or higher installed. Chapter 8, Navigation Mesh talks about creating a Navigation Mesh, something that requires Unity Pro. In Chapter 9, Behavior Trees we download Behave, a free Behavior Tree plugin, which requires an account with the Unity Store. Both of these requirements are optional because the assets that come with this book already have the Navigation Mesh generated and the Behave plugin.

This book is for anyone who wants to learn about incorporating AI into games. This book is intended for users with prior experience of using Unity. We will be coding in C#, so some familiarity with this language is expected.

In this book, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text are shown as follows: "The AdvanceFSM class basically manages all the FSMState(s) implemented, and keeps updated with the transitions and the current state."

A block of code is set as follows:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public enum Transition
{
    None = 0,
    SawPlayer,
    ReachPlayer,
    LostPlayer,
    NoHealth,
}

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "Our Tank object is basically a simple Mesh with a Rigidbody component."

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