disapear

heres a map i made 4 esf, it took me about 4 hours basically i want to know what u think of the sky boundaries on the edges of the map. it fixes the annoying glitch where the map dissappears. shouldn't all esf maps be like this? esf_skyarena *edit* ok, u guys wanted pics and explanation...

Yeah, I couldn't think of a better title. Anway, if you fly to the very top of a map or very bottom then half of the map is gone. Objects and stuff are still there but the map isn't. This could be an effect of the draw distance, but I don't know much about the half-life engine.