Book Image

Game Physics Cookbook

By : Gabor Szauer
Book Image

Game Physics Cookbook

By: Gabor Szauer

Overview of this book

Physics is really important for game programmers who want to add realism and functionality to their games. Collision detection in particular is a problem that affects all game developers, regardless of the platform, engine, or toolkit they use. This book will teach you the concepts and formulas behind collision detection. You will also be taught how to build a simple physics engine, where Rigid Body physics is the main focus, and learn about intersection algorithms for primitive shapes. You’ll begin by building a strong foundation in mathematics that will be used throughout the book. We’ll guide you through implementing 2D and 3D primitives and show you how to perform effective collision tests for them. We then pivot to one of the harder areas of game development—collision detection and resolution. Further on, you will learn what a Physics engine is, how to set up a game window, and how to implement rendering. We’ll explore advanced physics topics such as constraint solving. You’ll also find out how to implement a rudimentary physics engine, which you can use to build an Angry Birds type of game or a more advanced game. By the end of the book, you will have implemented all primitive and some advanced collision tests, and you will be able to read on geometry and linear Algebra formulas to take forward to your own games!
Table of Contents (27 chapters)
Game Physics Cookbook
About the Author
About the Reviewer
Customer Feedback

Transform matrix

We've briefly touched on the fact that our math library multiplies matrices in a left to right order. But what exactly does this mean? When we multiply two matrices, we combine their linear transformations into one matrix. The first transformation applied is the one on the far left, then the one to its right, and so on.

For example, let's take two matrices, one that translates an object by 10 units on its X axis and one that rotates it by 45 degrees on its Y axis:

mat4 transform1 = Translate(10, 0, 0) * RotateY(45);
mat4 transform2 = RotateY(45) * Translate(10, 0, 0);

Because matrix multiplication is not cumulative , transform1, and transform2 are not the same! transform1 will move the object to (10, 0, 0), and then rotate the object at that position:

transform2, on the other hand, will rotate the object by 45 degrees on its Y axis, and then translate it by 10 units on its local X axis:

Getting ready

The multiplication order is highly dependent on the conventions you are using...