My own free, open-source Computer Graphics book guides you through building both a raytracer and a rasterizer: https://gabrielgambetta.com/computer-graphics-fro

My own free, open-source Computer Graphics book guides you through building both a raytracer and a rasterizer: https://gabrielgambetta.com/computer-graphics-from-scratch https://gabrielgambetta.com/computer-graphics-from-scratch Soon to become a real book published by No Starch Press!