well today i decided to whip up a quick test of some 3d concepts and ideas i wanted to try in 99.3
http://files.getdropbox.com/u/1010927/3d%20shooting.cap
its simply a test of shooting in 3d space, using Z depth as a dimension in place of Y. the collisions with the blue squares are a bit bugged at the moment, but im trying to fix that.
mouse controls your aiming direction, clicking spams a stream of bullets, and shift is to jump, arrows control your characters L/R movement and Z movement.