# CHAPTER 0 — Points and Lines

This is a tutorial on the mathematical tools
used in Three Dimensional Computer Graphics (3D Graphics).
A 3D graphics program
builds a scene composed of three dimensional objects
in three dimensional space.
Then two dimensional images are produced from the 3D scene.
The scene is represented as a data structure in computer memory.
The 2D image is typically the picture on the face of a computer monitor.

The 3D objects are composed of points, lines, and polygons.
You know what these are,
but so that we can start from a common ground,
this chapter reviews these concepts
and introduces some of the vocabulary of computer graphics.

#### Chapter Topics:

- Points.
- Lines.
- Triangles.
- Vectors.
- Representing points, lines, and vectors.

The two fundamental objects in geometry are points
and lines.
What are they?