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 – Mal-function


First, we'll take a look at what can go wrong in function declarations.

  1. Let's add a new function to our class:

    simulated function HitWall()
    {
    }
  2. Compile the code and we'll get this error:

    [0003.93] Log: R:\UDK\UDK-AwesomeGame\Development\Src\BrokenGame\Classes\BrokenActor.uc(4) : Error, Redefinition of 'function HitWall' differs from original; different number of parameters
  3. If we look at Actor.uc we can see the original declaration of this function:

    event HitWall( vector HitNormal, actor Wall, PrimitiveComponent WallComp )
  4. When overriding a function, you must use the same parameters as the original. You can change the names if you want, for instance this would work:

    simulated function HitWall( vector Norm, actor HitActor, PrimitiveComponent Prim )
    {
    }

    The number and type of parameters must stay the same though.

    This type of error usually results from misreading the parameters when overriding a function, or accidentally making up a function that already exists in a superclass...