Learning 2D Game Development With Unity® · A Hands-On Guide to Game Creation by Johnson, Matthew -- Read -- Imperial Library of Trantor

Index

About This eBook Title Page Copyright Page Dedication Page Contents at a Glance Contents Preface

Why Write This Book? Who Is This Book For? Why Did We Choose to Use Unity? What Will You Need? How Much Scripting Is Involved? How Is the Book Organized? Conventions Used in This Book Supplementary Materials

Acknowledgments About the Authors Introduction

Introduction to Unity

Downloading and Installing Unity

Project Wizard

Open Project Tab Create New Project Tab Packages

Setting Our Project

Project Structure Folder Organization File Naming Conventions

1. Setting Up the Unity Development Environment

Welcome Screen The Unity Interface

Menus Toolbar Hierarchy Inspector Project Browser Scene View Game View

Summary Exercises

2. Understanding Asset Creation

File Formats

3D Formats 2D Formats

Importing Our Assets

Importing from Inside Unity Importing Premade Assets from the File Browser Creating New Assets

Importing Packages

Unity Packages Custom Packages

GameObjects

Our First GameObject Creating a GameObject

Components

Creating a Component Assign a Component Prefabs

Summary Exercises

3. Creating 2D Sprites

Working in 2D

2D Behaviors 2D Workspace

Building Our Sprites

Import Settings Pixels To Units Sprite Editor

Sprite Packing

Packing Tag Sprite Packer Additional Sprite Packing Resources

Summary Exercises

4. Building the Game World

Level Design 101

Setting the Scene Creating a Roadmap Adding Details

Getting around Our Scene

Scene Gizmo Perspective versus Isometric Camera Controls

Manipulating Objects in Unity

Transform Tools Z-Depth Settings

Our First Level

Positioning GameObjects Manually Using the Snap Settings to Position GameObjects Using Grid Snapping to Position GameObjects Efficient Level Design Adding Sorting Elements

Continuing On Summary Exercises

5. The Basics of Movement and Player Control

Coding in Unity3D

The Three Languages Choosing the “Right” Language

Making the Player Go

Different Ways of Handling Movement Creating and Hooking Up Our PlayerController

Setting Up a Basic Follow-Cam Introducing the Input Manager Error Handling and Debugging

Handling Exceptions Try-Catch-Finally—Gracefully Handling Exceptions Debug.Log() Is Your Friend Using Breakpoints to Halt Code Execution

Summary Exercises

6. Adding Animations to Our Scene

Some Rules for Animation

Animation Principles 2D versus 3D Animation Transform versus Frame Animation Scripted Animations Imported Animations

Creating Animations

Animation Component Animation Clip Animation Window Animation Events

Animation States

Animator Controller Animator Component Animator Window Editing the Player Controller

Working with the State Machine

Transitions Any State Blend Trees

Summary Exercises

7. Setting Up Player Physics and Colliders

Understanding Physics

Mass Gravity Force

2D versus 3D

6DoF Z-Depth Rotations

Physics 2D Settings

General Physics Settings Layer Collision Matrix

Rigidbodies Colliders

Circle Collider Box Collider Edge Collider Polygon Collider

Physics Materials Constraints Summary Exercise

8. Creating and Applying Gameplay Systems

Trigger Volumes in Unity

Trigger2D Functions Adding Trigger Components to GameObjects

Creating Checkpoints

Scripting the Checkpoint Component Sizing and Placing Our Checkpoint Trigger

Using Checkpoints with Respawn

Preparing the Pit Trigger Volume Scripting the Pit Trigger Component

Creating Collectibles

Preparing the Floating Coin Prefabs for Collection Scripting the CoinPickup Component Preparing the Popped Coin Prefabs for Collection Preparing the Coin Box Prefabs Scripting the Coin Box Component Scripting the CoinSpawner Component Hooking It All Together A Touch of Polish

Tracking the Player’s Stats Summary Exercises

9. Creating Hazards and Crafting Difficulty

Creating Your First Enemy

Preparing the Slime Enemy GameObject Inheritance and the EnemyController Component Scripting the Enemy Slime Component Adding Walls to the Level Handling Collision with Other Slimes Adding Animation to the Slime

Dealing Damage

Scripting Damage into the PlayerStats Component Creating the Damage Trigger Passing through the Player’s Space Adding Damage to the Pits Adding Temporary Immunity Post-Damage Visually Representing Immunity, the Classical Way

Handling Player Death Expanding on Platforming

Preparing the Moving Platform Prefab Scripting the Flight Points Component

Creating Your Second Enemy

Preparing the Fly Enemy GameObject Adding Animation to the Fly Scripting the FlyController Component Adjusting the FlightPoints Script

Maintaining Your Enemy Arrangements

Preparing the Spawn Trigger Scripting the Spawn Trigger Component

A Few Words on Challenge Summary Exercises

10. Creating the Menus and Interface Elements

UI Design

Diegetic Non-diegetic Meta Spatial

Unity Native GUI

GUI Style GUI Skin GUI Controls Compound Controls GUI Class GUI Layouts GUI Text GUI Texture

Creating a Splash Screen Title Screen Game Over Screen Game Win Screen HUD

Creating the Visuals Creating the Scripts

Summary Exercise

11. Applying Effects to the GameObjects

Introducing the Shuriken Particle System

Terms to Know Creating a Particle System

Modules and Properties of a Particle System

Base Particle System Properties Other Particle System Modules Particle System Curves

Adding Particle Effects to the Game

Creating a Particle Effect for Coin Boxes Hooking Up the Coin Box Particle Effect Creating a Particle Effect for Damage Calling the Damage Particle System from Code Having a Little Particle Fun

Unity’s Audio System

The Audio Source Component The Audio Listener Component The Audio Reverb Zone Component

Adding Sound to the Player

Adding Footsteps to the Walk Cycle Adding Sound to the Jump Event Adding Sound to the Damage Event

Adding Sound to the Collectible System

Applying Sound to the Coin Box Applying Sound to Coin Collection

Applying Some Extra Polish

Cleaning Up the Camera Cleaning Up Player Death

Summary Exercises

12. Organization and Optimization

Organizing Assets

Organizing Our Prefabs Labels Hierarchy

Organizing Scripts and Code

Organizing the Script Files Organizing the Code

Optimizations

Prefabs Physics Draw Calls Triangle Count Batching Rendering Statistics Window

Summary Exercises

13. Bringing It All Together

Tying the Levels Together

Preparing the Victory Trigger Prefab Creating the Victory Trigger Script Retrieving the Coin Value

Hooking Up the Intro Screens Win or Lose: Getting Back into the Action

Recovering from Game Over Starting Over from a Win

Building and Deploying the Game

Web Player’s Build Settings PC, Mac, and Linux Standalone Build Settings Cross-Platform Player Settings Web Player’s Player Settings The Right Settings for the Job Building the Game for the Web Player Deploying the Game to the Web Post-Deployment

Moving Forward

Polish Considerations Monetization

Final Words

14. UGUI

UGUI Components Creating Our Example Interface

Canvas Component Rect Transform UI Rect Tool Adding the Mask The Event System and Event Triggers

Summary

Appendix: JavaScript Code Samples

Player Scripts Collectible Scripts Enemy Scripts Game System Scripts GUI Scripts Hazard Scripts System Scripts

Index Code Snippets

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