Wow, this reminds me of writing a very similar engine in the mid 90s after learning about ray-casting (and playing Doom of course). There was a very good book w

Wow, this reminds me of writing a very similar engine in the mid 90s after learning about ray-casting (and playing Doom of course). There was a very good book which covered the whole process called "Tricks of the Game Programming Gurus", which I would have killed for at the time!