Introduction

Collisions play a large role in physics, determining if two objects touch is half the work. To determine if collisions are happening, we need to cover some basic geometry. In this chapter, we define what the geometry being used for collision tests will be and even implement some basic containment tests.

In this chapter we will implement primitive two-dimensional shapes. In the following chapters which follow we will combine multiple primitive shapes to create more complex shapes. After we have mastered two-dimensional collisions, we will create three-dimensional geometry and collision tests.