Computer Graphics from Scratch

10DESCRIBING AND RENDERING A SCENE

In the last few chapters, we’ve developed algorithms to draw 2D triangles on the canvas given their 2D coordinates, and we’ve explored the math required to transform the 3D coordinates of points in the scene to the 2D coordinates of points on the canvas.

At the end of the previous chapter, we cobbled together a program that used both to render a 3D cube on the 2D canvas. In this chapter, we’ll formalize and extend that work with the goal of rendering a whole scene containing an arbitrary number of objects.

Representing a Cube

Let’s think again about how to represent and manipulate a cube, this time with the goal ...