Book Image

Unreal Engine Physics Essentials

By : Devin Sherry, Katax Emperore
Book Image

Unreal Engine Physics Essentials

By: Devin Sherry, Katax Emperore

Overview of this book

This book gives readers practical insight into the mathematical and physics principles necessary to properly implement physics within Unreal Engine 4. Discover how to manipulate physics within Unreal Engine 4 by learning basic real-world mathematical and physics concepts that assist in the implementation of physics-based objects in your game world. Then, you'll be introduced to PhAT (Physics Asset Tool) within Unreal Engine 4 to learn more about developing game 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 to create real-world physics in Unreal Engine 4. Lastly, you will create a working Vehicle Blueprint that uses all the concepts covered in this book, as well as covering advanced physics-based topics.

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Unreal Engine Physics Essentials
Devin Sherry | Katax Emperore
Sep, 2015 | 216 pages
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Table of Contents (15 chapters)
Unreal Engine Physics Essentials
Unreal Engine Physics Essentials
Credits
Credits
About the Authors
About the Authors
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Math and Physics Primer
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 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 laws of motion – a section review
Forces and energy
Forces and energy – a section review
Summary
2
Physics Asset Tool
Physics Asset Tool
Navigating to PhAT
Summary
3
Collision
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
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 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
Materials
What is physical material?
Creating the first material
The physics of materials
Summary
7
Creating a Vehicle Blueprint
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
Advanced Topics
Simulating complex physics – destruction
Summary
Index
Index

Angular and Linear Damping

In this section, we will discuss Angular and Linear Damping in more detail, focusing on the friction properties of physics bodies. Further more, we will discuss physics damping and how this can be used when setting up the constraints for our blueprints. Let's begin by briefly discussing Angular Damping and Angular Velocity/Momentum.

In the realm of physics, Angular Velocity is defined as the rate of change of angular displacement, also known as a vector quantity, which specifies the angular speed or the rotational speed of an object and the axis in which the object is rotating.

In the preceding diagram, we can see that w, or the angular speed, is equal to the velocity divided by the radius of the object that is rotating.

Linear Angular Momentum is proportional to Moment of Inertia (I) and Angular Speed (w), so the basic formula is L = Iw. We now know that w is equal to the velocity and radius of the object, so we can now write the expression as L = I (v/r). Lastly...

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