Polygon

Tags

computer-graphics

A 3D pixel, often represented as a triangle.

Why a Triangles?

Triangles are used [see page 474, because]:

• They are the simplest kind of polygon... less than three points can't form a surface.
• Are flat (planar). The first 3 vertices define a plane, but a \nth{4} may be above or below it.
• They remain triangular under most kinds of transformations
• Their usage is widespread.