Triangles are Always Convex Polygons

What does it mean to be a convex?

An object is convex if and only if any line segment connecting two points
on its boundary is contained entirely within the object or one of its boundries.


Why is being convex important?
    Because no matter how a triangle is oriented on the screen a given scan line will contain only a single segment or span of that triangle.
Lecture 6   Slide 3   6.837 Fall '00