I've seen this before in other maps where the skybox covers the tops of angled roofs and what not but yet in the game you can see the building just fine. I tried that and some of the walls of my building appear as if they have a no draw on them, which they don't. The skybox has the correct texture on all sides so I'm baffled as to why one of the walls was see through. Since the skybox brush is still a world brush, I wanted it to be even with the wall to keep a nice clean face so I didn't break up the vis plane, or whatever you call that. what's the normal rule on using skybox across building tops to seal an area? I func_detailed the angled roof but the 4 walls (one big square brush) is not func_detail so it can seal to the skybox brush. Thanks.