Station shaders

I've been pretty busy this evening to get the shaders ready for the space station. Shawn is making nice progress on it, but it's far from being finished. The results are starting to look nice, so i think i'll be posting a few screenshots of how it looks inside the game tomorrow.

I've implemented a couple effects in the shaders:
- per-pixel lighting with bump mapping
- per-pixel specular lighting with gloss mapping ( making some areas more or less shiny )
- self-illumination ( like small windows ); but i haven't done the glow filter yet, so the contours look sharp.
- ambient occlusion ( still per vertex ), subtle because not very visible.

In the coming months, i'll also implement:
- dynamic shadow maps
- dynamic cube map reflections
- ambient color reflection ( via a small blurred cube map )

At the moment i'm trying to get all the shaders working in object/tangent space, to be able to position and rotate them arbitrarily in world space. The amount of code to modify is very small, but it's very tricky.