I've been working hard lately on my raycasting engine, blueTech 1. It's really come along. I had doors for a short time, but decided to go a different route on rendering non-walls(I call them objects). So I'm in the process of adding sprites with proper z-buffering.
I'm not sure what my overall goal is still. Do I want to make a game? I'd love to make some sort of dungeon crawl that can be played with networking.
It's been fun, and been a serious challenge. I like to hope some day I can move into more advanced 3D topics and rendering.
In the next couple days, I will post some screenshots for everyone's enjoyment. Hopefully I'll have the sprite texture stuff figured out today.
More on blueTech 1 can be found on the blueTech 1 homepage.