Book Image

Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide

By : Rachel Cordone
Book Image

Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide

By: Rachel Cordone

Overview of this book

Unreal Development Kit is the free edition of Unreal Engine—the largest game engine in existence with hundreds of shipped commercial titles. The Unreal Engine is a very powerful tool for game development but with something so complex it's hard to know where to start.This book will teach you how to use the UnrealScript language to create your own games with the Unreal Development Kit by using an example game that you can create and play for yourself. It breaks down the UnrealScript language into easy to follow chapters that will quickly bring you up to speed with UnrealScript game programming.Unreal Development Kit Game Programming with UnrealScript takes you through the UnrealScript language for the Unreal Development Kit. It starts by walking through a project setup and setting up programs to write and browse code. It then takes you through using variables, functions, and custom classes to alter the game's behavior and create our own functionality. The use and creation of Kismet is also covered. Later, using replication to create and test multiplayer games is discussed. The book closes with code optimization and error handling as well as a few of the less common but useful features of UnrealScript.
Table of Contents (18 chapters)
Unreal Development Kit Game Programming with UnrealScript
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – BeginState


BeginState and EndState are both declared in Object.uc, and like other functions, they don't necessarily have to be used inside a state, although that's where they are most useful. BeginState is called when an actor enters any state, before any of that state's code is run. This makes it useful for running any set-up code that the state needs. EndState is run right before an actor leaves a state and lets us do any cleanup or other changes we need to at that point. Both of these functions are called during the chain of events when GoToState is called. EndState is called on the state that's being left and BeginState on the state that the actor is going into.

Let's see how we can use these functions in our AwesomeEnemy class.

  1. The easiest thing we could do to try out these functions is change the enemy's appearance based on what state it's in, so let's try that. First, let's declare a few materials to use for the various states:

    var Material SeekingMat, AttackingMat...