The SIGGRAPH shading courses:
Contain information about both online and offline rendering, including heavy descriptions from Disney & Pixar.
I find programming graphics extremely interesting, especially within game engines and animated movies from studios such as Pixar and Disney.
Creating a game engine is no easy task, although, you find plenty of tutorials and open source projects to help you on your way to creating your own. However, I have yet to see any tutorials based on non-realtime graphic solutions for things like animated movies, which is what I'm interested in.
Probably because you should be looking for rendering engines and not game engines. A Rendering Engine is only a subset of Game Engines (which also deal with Physics, AI, Networking, Audio).
Furthermore you'll probably get info about realtime rendering methods, while you should be looking for offline raytracers, pathtracers and the like, which is what's used in (most) animated movies. Mitsuba can be very educational.
Thanks! This helps a lot.
I have also been looking at papers pixar provide on rendering techniques etc (http://graphics.pixar.com/library/).