#### Overview of this book

This book, written by a team of experts at Unity Technologies, follows an informal, demystifying approach to the world of game development. Within Unity 3D Game Development, you will learn to: Design and build 3D characters and game environments Think about the users’ interactions with your game Develop an interface and apply visual effects to add an emotional connection to your world Gain a solid foundation of sound design, animations, and lighting Build, test, and add final touches The book contains expert insights that you’ll read before you look into the project on GitHub to understand all the underpinnings. This way, you get to see the end result, and you’re allowed to be creative and give your own thoughts to design, as well as work through the process with the new tools we introduce. Join the book community on Discord to read this book with Unity game developers, and the team of authors. Ask questions, build teams, chat with the authors, participate in events and much more. The link to join is included in the book.
Preface
A Primer to the Third Dimension
Free Chapter
Design and Prototype
Programming
Characters
Environment
Interactions and Mechanics
Rigid Bodies and Physics Interaction
Visual Effects
Sound Effects
Build and Test
Finishing Touches
Bonus: Other Unity Tools!
Other Books You May Enjoy
Index

# Coming around to 3D

We will be going over a basic understanding of 3D work within this section. From coordinate systems to the makeup of how the 3D model is rendered, we will only go surface-level to ensure that you fully understand the foundations as you progress through this journey. By reading through this, you will gain a strong understanding of how Unity displays items.

## Coordinate systems

3D coordinate systems are not all the same in each 3D application! As is demonstrated in Figure 1.1, Unity is a left-handed world coordinate system with +y facing upward. Looking at Figure 1.1, you can visualize the difference between left-handed and right-handed systems.

Figure 1.1: Coordinate systems

While we work within these coordinate systems, you will see the positions of objects represented in an array of three values within parentheses as follows:

(0, 100, 0)

This represents (x, y, z) respectively. This is a good habit to get into as programming utilizes...