I am in the process of developing the skybox around the main part of my map. My question is wheather or not all structures have to be under it as long as they are sealed from the void. I took a look at ctf_2fort and there is the underground portion not within the main skybox. Well a portion of my map functions the same way and is meant to be underground as well. So is it ok to build the skybox around just the mid of my map. Will ceilings light up properly and not look like blackness in the underground portions. I have have never really had this clarified and in the past built these vast skybox's that eat up a ton of compile time. I want this to be done right the first time.