Originally Posted by wisecode
Don't use the direction extensions with your skybox material names.
In your example above skyday_01_05bk is the named material for one of the vertical sides and will not work.
The correct skybox material name would be skyday_01_05
btw, We did the original HL2 skylist that HL2world copied, it's the same as the ours, almost.
Okay, I'll give it a try. Also great work with the skylist then.