I've recently gotten permission from some authors to update some old urban terror maps to run in urt 4.x. One of the mappers "MAD-HORSE" had a map called ut_blackbridge which was never finished as it had no skybox, and some unfinished models. I added 2 sky textures, then came up with this shader:
I'm pretty sure you can do that, and more. My original intention was to have the entire sky turn dark, but after a good hour of playing with the shader I stopped and figured that was good enough. I did not want to over do it.
A good thought was to somehow trigger something like thunder.wav, but as i see it you cannot use a shader to trigger a sound, I think it would have to be information in the bsp
thanks, but i dont really understand that _skybox tutorial... say if i put my map inside a box, and then textured the inside of that box with the sky texture, what do I do from there? because I find that way causes shadows against each side of the box, as well as there being the cracks between each brush of the box