Unreal Engine Physics Essentials

Table of Contents

Unreal Engine Physics Essentials

Credits

About the Authors

About the Reviewer

www.PacktPub.com

Support files, eBooks, discount offers, and more

Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the color images of this book

Errata

Piracy

Questions

1. Math and Physics Primer

Launching Unreal Engine 4

Units of measurement

What is an Unreal Unit?

Common measurements in Unreal Engine 4

Unit snapping in Unreal Engine 4

Changing units of measurement in 3ds Max and Maya

Units of measurement – a section review

The scientific notation

How to use scientific notation?

The scientific notation – a section review

The 2D and 3D coordinate systems

The top perspective

The side perspective

The front perspective

The 2D and 3D coordinate systems – a section review

Scalars and vectors

Scalars and vectors – a section review

Newton's laws/Newtonian physics concepts

Newton's first law of motion

Newton's second law of motion

Newton's third law of motion

Newton's laws of motion – a section review

Forces and energy

Forces and energy – a section review

Summary

2. Physics Asset Tool

Navigating to PhAT

The PhAT environment

The PhAT example and experience

Deleting current assets

Adding and customizing current assets

Summary

3. Collision

Collision and Trace Responses – an overview

Collision and Trace Responses – a section review

Simple versus complex collision

Simple versus complex collision – a section review

Creating simple collisions

Creating simple collisions – a section review

Creating complex and custom collision hulls

Creating complex and custom collision hulls – a section review

Collision interactions

Collision interactions – a section review

Custom object and trace channel responses

Custom object and trace channel responses – a section review

In-depth collision presets

In-depth collision presets – a section review

Summary

4. Constraints

What are constraints?

The first physics constraint actor experience

Customizing physics constraint actor

A simple game with Blueprint

Summary

5. Physics Damping, Friction, and Physics Bodies

Physics Bodies – an overview

Physics Bodies – a section review

Angular and Linear Damping

Angular and Linear Damping – a section review

Physical Materials – an overview

Physical Materials – a section review

Physics Damping

Physics Damping – a section review

Summary

6. Materials

What is physical material?

Creating the first material

The physics of materials

Summary

7. Creating a Vehicle Blueprint

Vehicle Blueprint – a content overview

Vehicle Blueprints – a section overview

Creating the Vehicle Blueprints

Creating the Vehicle Blueprints – a section review

Editing the Vehicle Blueprints

Editing the Vehicle Blueprints – a section review

Setting up user controls

Setting up user controls – a section review

Scripting movement behaviors

Scripting movement behaviors – a section review

Testing the vehicle

Summary

8. Advanced Topics

Simulating complex physics – destruction

Summary

Index

Unreal Engine Physics Essentials

Unreal Engine Physics Essentials

Copyright © 2015 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.

Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.

Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.

First published: September 2015

Production reference: 1230915

Published by Packt Publishing Ltd.

Livery Place

35 Livery Street

Birmingham B3 2PB, UK.

ISBN 978-1-78439-490-5

www.packtpub.com

Credits

Authors

Katax Emperore

Devin Sherry

Reviewer

Abdullah Obaied

Commissioning Editor

Edward Bowkett

Acquisition Editor

Indrajit Das

Content Development Editor

Shubhangi Dhamgaye

Technical Editor

Siddhesh Ghadi

Copy Editor

Relin Hedly

Project Coordinator

Harshal Ved

Proofreader

Safis Editing

Indexer

Monica Ajmera Mehta

Graphics

Disha Haria

Production Coordinator

Nilesh R. Mohite

Cover Work

Nilesh R. Mohite

About the Authors

Katax Emperore was born in January 1974. Since his childhood days, he has loved board games, science magazines, comic books, and graffiti painting. Katax was introduced to the IT world when he got his first game platform, Fire Attack from the Game & Watch series by Nintendo, back in the 80's. While spending hours on it, he became curious about the process of creating games.

As a teenager, Katax owned Amiga 500 by Commodore on which he played hundreds of games. However, one stuck with him: Shadow of the Beast by Psygnosis. He was enamored by the quality of the graphics, music, and FX sounds involved in the game. Katax realized that he would like to learn to create such games, and this was the first step. Today, he can design and develop any game on various web pages and platforms alike.

The Amiga platform created a high-quality gaming experience supported by an advanced hardware architecture that was way ahead of its time. It was a high-profile computer with real stereo sound supported by the advanced Direct Memory Access technology for multiprocessing. On this platform, Katax learned many aspects of programming, multitasking, DMA, interactive applications, IO port mappings, graphic design, and 3D. When Microsoft introduced Windows 98, he got serious about programming, 3D, and graphic design, which led him to base his education, and later his career, in the IT industry.

Around this time, Katax experienced a live performance of a digital visual art improvisation over music known as a VJ performance. He was influenced by Jimi Hendrix, and he adopted his style of improvising each track on a live stage. His style involves visualizing forms, colors, and brightness of images and videos by playing live visual transitions over each pixel on the screen. Katax believes that it's necessary for each game designer/developer to be a part of some art movement or activity because it helps you in your career, both technically and spiritually.

Katax' favorite bands/artists include Klaus Schulze, Tangerine Dream, Hawkwind, and Jimi Hendrix.

I am grateful to John Carmack from id Software for his efforts and great work on 3D graphic programming. What he invented and developed back in the 90's was the beginning of the wonderful genre of first-person shooter games, which is my personal favorite. Also, I would like to thank Westwood Studios for introducing the Command and Conquer (C&C) series to the gaming world. This game pioneered many aspects of the modern real-time strategy games, which later powered many subgenres in this area as well. Great job, thank you!

Devin Sherry is originally from Levittown, Long Island in the state of New York, USA. He studied game development and game design at the University of Advancing Technology where he obtained a bachelor's degree of arts in game design in 2012.

During his time in college, Devin worked as a game and level designer with a group of students called Autonomous Games on a real-time, strategy style, third-person shooter game called The Afflicted using Unreal Engine 3/UDK. It was presented at the Game Developers Conference (GDC) in 2013 in the the GDC Play showcase.

Currently, Devin works as an independent game developer located in Tempe, Arizona, where he works on personal and contracted projects. His achievements include the title Radial Impact, which can be found in the Community Contributions section of the Learn tab of Unreal Engine 4's Launcher. You can follow Devin's work on his YouTube channel, Devin Level Design, where he educates viewers on game development within Unreal Engine 3, UDK, and Unreal Engine 4.

About the Reviewer

Abdullah Obaied is a self-taught software engineer with a long history of expertise in game programming. He has professionally worked on games such as Artifice: Faith in Chaos as well as on engines such as Unity and Unreal Engine 4. Furthermore, using the DirectX technology, Abdullah has developed his own engine labeled Nucleus Engine. He was also one of the developers selected to beta-test Unreal Engine 4 back in its early development stage.

Currently, Abdullah works at Mindvalley in Kuala Lumpur, Malaysia in the mobile app development team as an Android developer. You can follow him on his blog, http://damngoodcode.blogspot.com.

www.PacktPub.com

Support files, eBooks, discount offers, and more

For support files and downloads related to your book, please visit www.PacktPub.com.

Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? You can upgrade to the eBook version at www.PacktPub.com and as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at for more details.

At www.PacktPub.com, you can also read a collection of free technical articles, sign up for a range of free newsletters and receive exclusive discounts and offers on Packt books and eBooks.

https://www2.packtpub.com/books/subscription/packtlib

Do you need instant solutions to your IT questions? PacktLib is Packt's online digital book library. Here, you can search, access, and read Packt's entire library of books.

Why subscribe?

Fully searchable across every book published by Packt

Copy and paste, print, and bookmark content

On demand and accessible via a web browser

Free access for Packt account holders

If you have an account with Packt at www.PacktPub.com, you can use this to access PacktLib today and view 9 entirely free books. Simply use your login credentials for immediate access.

Preface

Giving readers practical insight into the principles of mathematics and physics necessary to properly implement physics within Unreal Engine 4, this book covers everything one needs to know in order to create a game world.

Discover how to manipulate physics within Unreal Engine 4 by learning from scratch the basic real-world concepts in mathematics and physics that assist in the implementation of physics-based objects in your game world. Then, be introduced to PhAT (Physics Asset Tool) within Unreal Engine 4 to learn more about developing physics objects for your game world. Next, dive into Unreal Engine 4's collision generation, physical materials, blueprints, constraints, and more to get hands-on experience with the tools provided by Epic Games to create the effect of the real physical world in Unreal Engine 4. Lastly, you will create a working Vehicle Blueprint that uses all the concepts covered in this book, and also cover topics related to advanced physics.

What this book covers

Chapter 1, Math and Physics Primer, covers basic concepts in mathematics and physics that will assist your understanding of how the real-world, and Unreal Engine 4, works.

Chapter 2, Physics Asset Tool, discusses how to properly utilize the Physics Asset Tool to create physics assets to use with Skeletal Meshes.

Chapter 3, Collision, invites readers to learn and apply collisions to physics assets in order to experiment with physics simulations.

Chapter 4, Constraints, discusses how to implement constraints onto actors and blueprints using the Physics Asset Tool.

Chapter 5, Physics Damping, Friction, and Physics Bodies, defines physics damping, friction, and physics bodies in the context of Unreal Engine 4.

Chapter 6, Materials, discusses physical materials and how to utilize them to create a realistic game world.

Chapter 7, Creating a Vehicle Blueprint, takes a look at applying the skills learned in the previous chapters to create the physical body and blueprint of a working vehicle.

Chapter 8, Advanced Topics, covers advanced topics and troubleshooting techniques in physics.

What you need for this book

This book assumes that readers have access to Unreal Engine 4 and can utilize version 4.7.0 or higher. If you do not have Unreal Engine 4, you can visit www.unrealengine.com/what-is-unreal-engine-4 to download the engine.

Furthermore, for those who are not familiar with how to use Unreal Engine 4, this text will walk you through some of the basics, but also assume that its readers have at least some experience with the engine.

Who this book is for

This book is intended for beginner to intermediate users of Epic Games' Unreal Engine 4 who want to learn more about how to implement physics within their game world.

No matter the knowledge base of Unreal Engine 4, this book contains valuable information on blueprint scripting, collision generation, materials, and the Physical Asset Tool (PhAT) for all users to create better games.

Conventions

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

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: We can name this parameter Material Color.

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: Clicking the Next button moves you to the next screen.

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.

Reader feedback

Feedback from our readers is always welcome. Let us know what you think about this book—what you liked or disliked. Reader feedback is important