If you're really interested in Raytracing, get hold of the Book "Physically-based Rendering" by Matt Pharr and Greg Humphreys. It's pretty-much the bible for r

If you're really interested in Raytracing, get hold of the Book "Physically-based Rendering" by Matt Pharr and Greg Humphreys. It's pretty-much the bible for raytracing theory at close to production level rendering, and has pbrt - an open source raytracer - which ships with it which is a relatively capable renderer, and an excellent example of how to design a renderer in an object-orientated way.