Custom Map Makers Skyboxes. Resize it to the nearest power of 2. Doing this means its very easy to isolate which sections of the map will be drawn however - this isnt a tutorial about construction its about the skybox.
To test skies in singleplayer without recompiling the map bring up the console and enter sv_skyname. Global Offensive CSGO Forum Thread in the Mapping Modelling and Textures category submitted by coolion32. Have a happy day.
Maybe Im just weird.
-Link download skybox 41mb. Map reviews Reviews of recently released maps. And while Enscape still supports that format it can also use a simple JPGPNG. Skyboxes use textures that are usually 1024x1024 pixels each.
