GtkRadiant/What Shaders can do

With shaders you can:
 * Make surfaces/volumes behave in certain ways ingame (water, lava, nonsolid, etc..)
 * Blend multiple textures together in various ways
 * Create surface sprites (useful for grass etc.)
 * Create blended terrain
 * Create scrolling, rotating textures.
 * Make textures glow ingame
 * Provide lighting to your map (light-emitting shaders)
 * Combinations of the above