I need help with changing the weather and maybe the time of day in a map specifically snow and night

depends on the map, but if your talking about Bigass:

http://hce-bigass.wikia.com/wiki/Information_for_server_hosts

I forgot to mention the map its timberland, I managed to make it darker than usual but it still has some sun Ray light, I also can't seem to figure out the weather

One more thing, when I had changed the textures in guerilla in sapien when I try to open up the 'mission' directory it crashes

If you mean like make it night it's nothing related to textures (kinda) but lightmaps. You first must change the sky tag to a night sky in guerilla or the sky of your choice then in sapien press the ~ button and type: radiosity_quality 0 (you could change the 0 to 1 for a more accurate lightmap but it will take a lot longer) then press enter
secondly type: radiosity_start (this might take sometime depending if you choose 0 or 1)
after the all numbers on the upper left side are all 0 type: radiosity_save then press enter and save your scenario. To add snow or rain etc. is something completely different.

I probably did a horrible job explaining so just read this tutorial if you need anything else:
http://hce.halomaps.org/hek/index.html?start=references/level_design/mp_level_design/mp_ld_level_radiosity.html

Edited by The Gravemind on Jul 26, 2018 at 03:10 PM