This is great! __A while ago I read an excellent article on a replacement for matrix transformations using a technique called "Control Cubes." It was a method as fast as maticies, but much easier to understand. Unfortunately the article got lost when GameProg became GameDev. __Now the author has updated the article and it is posted at Gamasutra.com! Go read it if you're lost on matrix transforms! Go read even if your not! They're faster in certain cases.
Actually, the article wasn't ever lost. We had it up here for a while. However, in talking to Isaac, we decided to remove the article because he wasn't happy with some of the things in it. He rewrote it, and you can see the results at Gama.
I agree, the article is excellent. Nice work, Four.