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  • Book Overview & Buying Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide
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Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide

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

By : Rachel Cordone
4.3 (27)
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Unreal Development Kit Game Programming with UnrealScript: Beginner's Guide

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

4.3 (27)
By: Rachel Cordone
Buy this Book

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)
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Unreal Development Kit Game Programming with UnrealScript
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Unreal Development Kit Game Programming with UnrealScript
Credits
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Credits
About the Author
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About the Author
About the Reviewers
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About the Reviewers
www.PacktPub.com
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www.PacktPub.com
Preface
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Preface
Lock Free Chapter
1
Project Setup and Test Environments
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Project Setup and Test Environments
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System requirements
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Time for action – Installing the UDK
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Directory overview
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Using external programs to code
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Time for action – Installing ConTEXT
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Time for action – Configuring ConTEXT
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Time for action – Installing UnCo
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Time for action – Configuring UnCodeX
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Setting up a project
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Time for action – Setting up AwesomeGame
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Compiling and testing
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Time for action – Compiling and testing AwesomeActor
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Summary
2
Storing and Manipulating Data
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Storing and Manipulating Data
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Variables and arrays
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Time for action – Using booleans
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Time for action – Using integers
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Time for action – Using floats
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Time for action – Using strings
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Time for action – Using enums
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Time for action – Using arrays
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Time for action – Using dynamic arrays
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Time for action – Using structs
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Time for action – Using vectors
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Time for action – Using rotators
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Variable properties
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Time for action – Using the default properties block
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Time for action – Editable variables
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Time for action – Creating config variables
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Common operators
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Time for action – Math!
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Time for action – Using modulo
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Time for action – Comparisons
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Time for action – Using logical operators
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Time for action – Concatenation
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Flow control
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Time for action – Using if/else
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Time for action – Using the for statement
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Time for action – Something
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Time for action – Using switches
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Summary
3
Understanding the Class Tree
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Understanding the Class Tree
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What is a class?
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Time for action – All classes are created equally
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Inheritance
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Time for action – Examining inheritance
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Time for action – Making a custom weapon
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Time for action – Experiments with inheritance
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Function overriding
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Time for action – Creating a custom GameInfo and PlayerController
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Time for action – Experiments with function overriding
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Actors as variables
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Time for action – Experiments with Actors as variables
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Casting
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Time for action – Casting Actor variables
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Time for action – A practical example of casting for our game
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Summary
4
Making Custom Classes
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Making Custom Classes
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Creating a class
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Time for action – Creating the weapon branch
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Class modifiers
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Time for action – Using abstract
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Time for action – Hidecategories
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Actors versus objects
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Common UnrealScript classes
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Time for action – Expanding AwesomeGame
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Time for action – SHOOT NOW!
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Time for action – Customizing the Pawn class
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Time for action – Expanding the Controller
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Time for action – No, my left!
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Time for action – Detecting collisions to give our Pawn damage
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Time for action – Making the TestEnemies move
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Time for action – Using the HUD
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Summary
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Using Functions
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Using Functions
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What's your function?
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Creating and calling functions
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Time for action – Writing a function
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Time for action – Calling custom functions
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Time for action – What's your malfunction?
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Local versus instance variables
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Time for action – Using local variables
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Time for action – Using Actors as local variables
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Time for action – Modifying the projectile
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Function parameters and modifiers
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Time for action – Using function parameters
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Time for action – Out parameters
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Time for action – I'd like to return this please
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Time for action – Filthy cheater
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Time for action – Using static functions
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The super
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Using timers
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Time for action – Just five more minutes mom
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Putting it all together
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Time for action – Expanding Awesome Game
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Summary
6
Using States to Control Behavior
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Using States to Control Behavior
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It's a state of mind
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Time for action – Writing a state
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Time for action – Switching states
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Function overriding in states
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Time for action – Multiple personalities
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Time for action – Calling non-state functions
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Time for action – Non-state functions from inside a state
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State changes and detection
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Time for action – BeginState
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Time for action – EndState
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Time for action – Using state detection functions
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Subclassing states
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Time for action – Subclassing the Seeking state
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Keywords, labels, and latent functions
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Time for action – Using ignores
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Time for action – Do we really need to give labels to everything?
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Like a boss
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Time for action – Reverting our code
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Time for action – Creating the abstract base class
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Time for action – Creating and spawning the boss
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Time for action – I like you, I kill you last
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Time for action – Rage mode activate
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Summary
7
Working with Kismet
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Working with Kismet
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Overview of Kismet
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Time for action – Using Kismet
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Time for action – A more complex Kismet sequence
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Time for action – Bug fixing time!
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Kismet actions
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Time for action – Creating Kismet actions
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Time for action – Using variables in Kismet
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Time for action – Using handler functions
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Time for action – Differentiating Kismet inputs
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Kismet conditions
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Time for action – What condition my condition was in
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Kismet events
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Time for action – The cleanup job
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Time for action – Our first Kismet event
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Time for action – Moving functionality into Kismet
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Time for action – Setting the wave size
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Time for action – Using SupportedEvents
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Time for action – Creating a custom SupportedEvent
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Latent actions
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Time for action – Creating a latent action
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Summary
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Creating Multiplayer Games
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Creating Multiplayer Games
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The server-client relationship
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Testing network code
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Time for action – The server batch file
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Time for action – The client batch file
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Time for action – Unbreaking the player
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Time for action – Unbreaking the game
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Time for action – Making the GameReplicationInfo
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Time for action – RUN AWAY!
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Time for action – Bossing around
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Replicating function calls
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Time for action – Setting up for the client function
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Time for action – Using the client function
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Time for action – Using a server function
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Time for action – Setting up the map
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Time for action – Using simulated functions
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Time for action – COMBO BREAKER!
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Role and authority
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Time for action – Examining Role and RemoteRole
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Time for action – Respect my authority!
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Time for action – Checking the level's NetMode.
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Replicating variables
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Time for action – Replicating a variable
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Time for action – Using ReplicatedEvent
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Summary
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Debugging and Optimization
chevron up
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Debugging and Optimization
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Compiler errors
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Time for action – Preparing for brokenness
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Time for action – A new script package
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Time for action – Breaking the class itself
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Time for action – Breaking some more code
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Time for action – Misleading errors
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Time for action – Captain obvious to the rescue!
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Time for action – Setting up a twofer
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Time for action – Mal-function
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Time for action – Taking care of other function errors.
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Time for action – Actor variable errors
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Time for action – Other variable errors
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Debugging
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Time for action – Dealing with Accessed None
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Time for action – Fixing an Accessed None
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Time for action – Accessed None in function parameters
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Time for action – Setting up a scenario
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Time for action – Debugging using the log
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Optimization
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Time for action – Using the profiler
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Time for action – Using Clock and UnClock
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Summary
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Odds and Ends
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Odds and Ends
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Using Components
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Time for action – Adding a Component to an Actor
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Time for action – Component compiler error
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Time for action – Components as variables
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Time for action – Creating a toggleable flashlight
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DLLBind
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Time for action – Using DLLBind
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Final Thoughts
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Summary
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Pop Quiz Answers
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Pop Quiz Answers
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Chapter 1, Project Setup and Test Environments
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Chapter 2, Storing and Manipulating Data
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Chapter 3, Understanding the Class Tree
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Chapter 4, Making Custom Classes
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Chapter 5, Using Functions
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Chapter 6, Using States to Control Behavior
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Chapter 7, Working with Kismet
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Chapter 8, Creating Multiplayer Games
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Chapter 9, Debugging and Optimization
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Chapter 10, Odds and Ends
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Index
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Index

Time for action – Other variable errors

There are a few more errors we need to take a look at before we move on. These ones have to do with the declaration and use of variables.

  1. Let's take a look at this PostBeginPlay function:

    simulated function PostBeginPlay()
{
    local int Int1, Int2;

    Int1 = 3;
    Int2 = 5;
    Int1 + Int2;
}

  2. If we try to compile that, we'll get this error message:

    [0003.77] Error: R:\UDK\UDK-AwesomeGame\Development\Src\BrokenGame\Classes\BrokenActor.uc(11) : Error, ';': Expression has no effect

  3. The source of that error is in this line:

        Int1 + Int2;

    We're not assigning the result of that to any variable, and we're not using it as a comparison or anything like that. If we wrote it like the following we wouldn't get the error:

    Int1 = Int1 + Int2;

    Not something you'd come across often, but it's good to know what the error message means.

  4. You would also get the same error message if a function parameter had the same name as another function, and you tried calling that function...

CONTINUE READING
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