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Home > Game Development > 3D Game Development > Unity 2018 By Example
Unity 2018 By Example
Unity 2018 By Example

Unity 2018 By Example: Learn about game and virtual reality development by creating five engaging projects , Second Edition

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Unity 2018 By Example

Chapter 2. Creating a Collection Game

This chapter continues from the previous one by building a collection game with Unity. In this game, the player wanders an environment in first-person mode, searching for and collecting all the coins in a scene before a global timer expires. If all coins are collected before timer expiry, the game is won. However, if the timer expires before all coins are collected, the game is lost. The project created so far features a complete environment, with a floor, props, and water, and it also features a first-person controller along with a basic coin object, which looks correct in shape and form but still cannot be collected.

This chapter completes the project by creating a coin object to collect and adding a timer system to determine whether the total game time has elapsed. In essence, this chapter is about defining a system of logic and rules governing the game. To achieve this, we'll need to code in C# and so this chapter requires a basic...

Creating a coin material

The previous chapter closed by creating a basic coin object from a non-uniformly scaled cylinder primitive. This object was created by selecting GameObject | 3D Object | Cylinder from the application menu. See Figure 2.1. The coin object, as a concept, represents a basic or fundamental unit in our game logic because the player character should be actively searching the level looking for coins to collect before a timer runs out. This means that the coin is more than mere appearance; its purpose in the game is not simply eye candy, but is functional. It makes an immense difference to the game outcome whether the coin is collected by the player or not. Therefore, the coin object, as it stands, is lacking in two important respects. Firstly, it looks dull and grey—it doesn't really stand out and grab the player's attention. Secondly, the coin cannot actually be collected yet. Certainly, the player can walk into the coin, but nothing appropriate happens...

C# scripting in Unity

Defining game logic, rules, and behavior often requires scripting. Specifically, to transform a static and lifeless scene with objects into an environment that does something, a developer needs to code behaviors. It requires someone to define how things should act and react under specific conditions. The coin collection game is no exception to this. In particular, it requires three main features:

  • To know when the player collects a coin
  • To keep track of how many coins are collected during gameplay
  • To determine whether a timer has expired

There's no default out-of-the-box functionality included with Unity to handle this scenario. So we must write some code to achieve it. Unity supports two languages, namely, UnityScript (sometimes called JavaScript) and C#. Both are capable and useful languages, but this book uses C# because, going forward, support for JavaScript will eventually be dropped. Let's start coding these three features in sequence. To create a new script...

Counting coins

The coin collection game wouldn't really be much of a game if there were only one coin. The central idea is that a level should feature many coins, all of which the player should collect before a timer expires. Now, to know whether all coins have been collected, we'll need to know how many coins there are in total in the scene. After all, if we don't know how many coins there are, then we can't know if we've collected them all. So, our first task in scripting is to configure the Coin class so that we can know the total number of coins in the scene at any moment easily. Consider Code Sample 2.3, which adapts the Coin class to achieve this:

//-------------------------
using UnityEngine;
using System.Collections;
//-------------------------
public class Coin : MonoBehaviour 
{
  //-------------------------
  //Keeps track of total coin count in scene
  public static int CoinCount = 0;
  //-------------------------
  // Use this for initialization
  void...

Collecting coins

Previously, we developed a coin counting variable telling us how many coins are in the scene. However, regardless of the count, the player still can't collect the coins during gameplay. Let's fix this now. To start, we need to think about collisions. Thinking carefully, we know that a coin is considered collected whenever the player walks into it, that is, a coin is collected when the player and the coin intersect or collide.

To determine when a collision happens like that, we must approximate the volume of both the player and coin in order to determine when the two volumes overlap in space. This is achieved in Unity through colliders. Colliders are special physics objects attached to meshes. They tell us when two meshes intersect. The FPSController object (First-person controller) already has a collider on it, through its Character Controller component. This approximates the physical body of a generic person. This can be confirmed by selecting FPSController in...

Coins and prefabs

The basic coin functionality is now created, but the scene needs more than one coin. The problem with simply duplicating a coin and scattering the duplicates is that if we make a change later to one coin and need to propagate that change to all other coins, we'd need to delete the former duplicates and manually replace those with newer and amended duplicates. To avoid this tedious repetition, we can use prefabs. Prefabs let you convert an object in the scene to Assets in the Project panel. This can be instantiated in the scene as frequently as needed, as though it were a mesh asset. The advantage is that changes made to the asset are automatically applied to all instances automatically, even across multiple scenes.

This makes it easier to work with custom assets, so let's prefab the coin right now. To do this, select the Coin object in the scene and then drag and drop it in the Project panel. When this happens, a new prefab is created. The object in the scene...

Timers and countdowns

You should now have a level complete with geometry and coin objects. Thanks to our newly added Coin.cs script, the coins are both countable and collectible. Even so, the level still poses little or no challenge to the player because there's no way the level can be won or lost. Specifically, there's nothing for the player to achieve. This is why a time limit is important for the game: it defines a win and loss condition. Namely, collecting all coins before the timer expires results in a win condition and failing to achieve this results in a loss condition. Let's get started at creating a timer countdown for the level. To do this, create a new and empty game object by selecting GameObject | Create Empty and rename this LevelTimer. See Figure 2.25:

Timers and countdowns

Figure 2.25: Renaming the timer object

Note

Remember that empty game objects cannot be seen by the player because they have no mesh renderer component. They are especially useful to create functionality and behaviors...

Celebrations and fireworks!

The coin collection game is nearly finished. Coins can be collected and a timer expires, but the win condition itself is not truly handled. That is, when all coins are collected before time expiry, nothing actually happens to show the player that they've won. The countdown still proceeds and even restarts the level as though the win condition hadn't been satisfied at all. Let's fix this now. Specifically, when the win scenario happens, we should delete the timer object to prevent further countdown and show visual feedback to signify that the level has been completed. In this case, I'll add some fireworks! So, let's start by creating the fireworks. You can add these easily from the Unity Particle System packages. Navigate to the Standard Assets | ParticleSystems | Prefabs folder. Then, drag and drop the Fireworks particle system in Scene.

Add a second or even a third one if you want:

Celebrations and fireworks!

Figure 2.29: Adding two Fireworks prefabs

By default,...

Creating a coin material

The previous chapter closed by creating a basic coin object from a non-uniformly scaled cylinder primitive. This object was created by selecting GameObject | 3D Object | Cylinder from the application menu. See Figure 2.1. The coin object, as a concept, represents a basic or fundamental unit in our game logic because the player character should be actively searching the level looking for coins to collect before a timer runs out. This means that the coin is more than mere appearance; its purpose in the game is not simply eye candy, but is functional. It makes an immense difference to the game outcome whether the coin is collected by the player or not. Therefore, the coin object, as it stands, is lacking in two important respects. Firstly, it looks dull and grey—it doesn't really stand out and grab the player's attention. Secondly, the coin cannot actually be collected yet. Certainly, the player can walk into the coin, but nothing appropriate happens in response:

Figure...

C# scripting in Unity

Defining game logic, rules, and behavior often requires scripting. Specifically, to transform a static and lifeless scene with objects into an environment that does something, a developer needs to code behaviors. It requires someone to define how things should act and react under specific conditions. The coin collection game is no exception to this. In particular, it requires three main features:

  • To know when the player collects a coin

  • To keep track of how many coins are collected during gameplay

  • To determine whether a timer has expired

There's no default out-of-the-box functionality included with Unity to handle this scenario. So we must write some code to achieve it. Unity supports two languages, namely, UnityScript (sometimes called JavaScript) and C#. Both are capable and useful languages, but this book uses C# because, going forward, support for JavaScript will eventually be dropped. Let's start coding these three features in sequence. To create a new script file,...

Counting coins

The coin collection game wouldn't really be much of a game if there were only one coin. The central idea is that a level should feature many coins, all of which the player should collect before a timer expires. Now, to know whether all coins have been collected, we'll need to know how many coins there are in total in the scene. After all, if we don't know how many coins there are, then we can't know if we've collected them all. So, our first task in scripting is to configure the Coin class so that we can know the total number of coins in the scene at any moment easily. Consider Code Sample 2.3, which adapts the Coin class to achieve this:

//-------------------------
using UnityEngine;
using System.Collections;
//-------------------------
public class Coin : MonoBehaviour 
{
  //-------------------------
  //Keeps track of total coin count in scene
  public static int CoinCount = 0;
  //-------------------------
  // Use this for initialization
  void Start () 
{
    //Object...

Collecting coins

Previously, we developed a coin counting variable telling us how many coins are in the scene. However, regardless of the count, the player still can't collect the coins during gameplay. Let's fix this now. To start, we need to think about collisions. Thinking carefully, we know that a coin is considered collected whenever the player walks into it, that is, a coin is collected when the player and the coin intersect or collide.

To determine when a collision happens like that, we must approximate the volume of both the player and coin in order to determine when the two volumes overlap in space. This is achieved in Unity through colliders. Colliders are special physics objects attached to meshes. They tell us when two meshes intersect. The FPSController object (First-person controller) already has a collider on it, through its Character Controller component. This approximates the physical body of a generic person. This can be confirmed by selecting FPSController in the Scene...

Coins and prefabs

The basic coin functionality is now created, but the scene needs more than one coin. The problem with simply duplicating a coin and scattering the duplicates is that if we make a change later to one coin and need to propagate that change to all other coins, we'd need to delete the former duplicates and manually replace those with newer and amended duplicates. To avoid this tedious repetition, we can use prefabs. Prefabs let you convert an object in the scene to Assets in the Project panel. This can be instantiated in the scene as frequently as needed, as though it were a mesh asset. The advantage is that changes made to the asset are automatically applied to all instances automatically, even across multiple scenes.

This makes it easier to work with custom assets, so let's prefab the coin right now. To do this, select the Coin object in the scene and then drag and drop it in the Project panel. When this happens, a new prefab is created. The object in the scene is automatically...

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Page 1 of 13

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Key benefits

  • Create five different types of games from scratch with Unity 2018
  • Import custom content into Unity from third-party tools such as Maya and Blender
  • Learn to build NPCs with artificial intelligent behavior.

Description

Unity is the most exciting and popular engine used for developing games. With its 2018 release, Unity has become the primary source of both game development and virtual reality content. In Unity 2018 By Example, you’ll learn how to use Unity in order to make amazing games from popular genres - from action shooters to mind-bending puzzle games to adventure and Virtual Reality (VR) games. Even if you have no previous experience of using Unity, this book will help you understand the toolsets it provides in depth. In addition to this, you'll understand how to create time-critical collection games, twin-stick space shooters, platformers, and action-fest games with intelligent enemies. Finally, you'll get to grips with creating VR games with the new toolsets introduced by Unity to help you develop amazing VR experiences. To make things easier, you will be provided with step-by-step tutorials for making five great games in Unity 2018, along with a detailed explanation of all the fundamental concepts. By the end of this book, you’ll have established a strong foundation in making games with Unity 2018.

Who is this book for?

You don't need to have any previous experience with Unity to enjoy Unity 2018 By Example, although you need to have basic knowledge of C#.

What you will learn

  • Understand core Unity concepts, such as game objects, components, and scenes
  • Study level-design techniques for building immersive and interesting worlds
  • Make functional games with C# scripting
  • Use the toolset creatively to build games with different themes and styles
  • Handle player controls and input functionality
  • Work with terrains and world-creation tools
  • Get to grips with making both 2D and 3D games
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Publication date : Jul 31, 2018
Length: 484 pages
Edition : 2nd
Language : English
ISBN-13 : 9781788398701
Category :
Game Development
Languages :
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Concepts :
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Tools :
Unity

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Publication date : Jul 31, 2018
Length: 484 pages
Edition : 2nd
Language : English
ISBN-13 : 9781788398701
Category :
Game Development
Languages :
C#
Concepts :
3D Game Development
Tools :
Unity

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Table of Contents

13 Chapters
1. Unity Fundamentals Chevron down icon Chevron up icon
1. Unity Fundamentals
Game design
Getting started – Unity and projects
Projects and project folders
Importing assets
Starting a level
Transformations and navigation
Scene building
Lighting and sky
Play testing and the Game tab
Adding a water plane
Adding a coin to collect
Summary
Test your knowledge
Further Reading
2. Creating a Collection Game Chevron down icon Chevron up icon
2. Creating a Collection Game
Creating a coin material
C# scripting in Unity
Counting coins
Collecting coins
Coins and prefabs
Timers and countdowns
Celebrations and fireworks!
Play testing
Building
Summary
Test your knowledge
Further reading
3. Creating a Space Shooter Chevron down icon Chevron up icon
3. Creating a Space Shooter
Looking ahead – the completed project
Getting started with a space shooter
Creating a player object
Player input
Configuring the game camera
Bounds locking
Health
Death and particles
Enemies
Enemy spawning
Summary
Test your knowledge
Further reading
4. Continuing the Space Shooter Chevron down icon Chevron up icon
4. Continuing the Space Shooter
Guns and gun turrets
Ammo prefabs
Ammo spawning
User controls
Scores and scoring – UI and text objects
Working with scores – scripting with text
Polishing
Testing and diagnosis
Building
Summary
Test your knowledge
Further Reading
5. Creating a 2D Adventure Game Chevron down icon Chevron up icon
5. Creating a 2D Adventure Game
A 2D Adventure – getting started
Importing assets
Creating an environment – getting started
Environment Physics
Creating a player
Scripting the player movement
Optimization
Summary
Test your knowledge
Further reading
6. Continuing the 2D Adventure Chevron down icon Chevron up icon
6. Continuing the 2D Adventure
Moving platforms
Creating other scenes – levels 2 and 3
Kill zones
The UI health bar
Ammo and hazards
Gun turrets and ammo
NPCs and quests
Summary
Test your knowledge
Further Reading
7. Creating Artificial Intelligence Chevron down icon Chevron up icon
7. Creating Artificial Intelligence
An overview of the project
Getting started
Terrain construction
Navigation and navigation meshes
Building an NPC
Creating patrolling NPCs
Summary
Test your knowledge
Further Reading
8. Continuing with Intelligent Enemies Chevron down icon Chevron up icon
8. Continuing with Intelligent Enemies
Enemy AI – range of sight
An overview of Finite State Machines
The Patrol state
The Chase state
The Attack state
Summary
Test your knowledge
Further Reading
9. Entering Virtual Reality Chevron down icon Chevron up icon
9. Entering Virtual Reality
Project Overview – Getting Started
Setting Scene Lighting
Post-Processing Stack 2
Preparing for VR
Summary
Test your knowledge
10. Completing the VR Game Chevron down icon Chevron up icon
10. Completing the VR Game
Object Pool and Spawning
Creating Intelligent Enemies – Navigation
Creating Intelligent Enemies – FSMs
Attack and Damage
Summary
Test your knowledge
A. Test Your Knowledge Answers Chevron down icon Chevron up icon
A. Test Your Knowledge Answers
Chapter 1- Unity Fundamentals
Chapter 2- Creating a Collection Game
Chapter 3- Creating a Space Shooter
Chapter 4- Continuing the Space Shooter
Chapter 5- Creating a 2D Adventure
Chapter 6- Continuing the 2D Adventure
Chapter 7- Creating Artificial Intelligence
Chapter 8- Continuing with Intelligent Enemies
Chapter 9- Entering Virtual Reality
Chapter 10- Completing the VR Game
Other Books You May Enjoy Chevron down icon Chevron up icon
Other Books You May Enjoy
Leave a review - let other readers know what you think
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
(2 Ratings)
5 star 50%
4 star 0%
3 star 0%
2 star 0%
1 star 50%
RhoneRanger Oct 23, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is a book that all beginners to Unity MUST HAVE. This book takes the concepts of Unity development, spoon feeds the user what he / she needs to know, and builds up each chapter based on the last. You will learn very quickly how to design, program, and thoroughly enjoy Unity game development. Especially useful are the ends of each section that "test" what has been learned. The game examples are fantastic, and the final chapters delve into some very advanced topics.
Amazon Verified review Amazon
ElBurp Nov 21, 2019
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
I never got past the first chapter, where I was to import "assets" it didn't work. After repeated emails, I finally got an email from the author, with cryptic instructions that didn't work. Why not put a chapter on setting up the environment before getting into the other stuff. The authors response seemed to assume I had some experience with this tool, which I don't.So far a big waste of money.
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  • eBook eBook €8.99
  • Paperback Paperback €59.99
€8.99 €47.99
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FAQs

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela