I'm fairly new to mapping and for my first map I'm making a little koth map in using Sawmill's art style. I've got almost everything in place, and I downloaded a decompiled sawmill to help myself out, check wood textures, get the necessary props, that sort of thing. I noticed sawmill is rainy everywhere except indoors, and the rain is coming from info_particle_systems using env_rain_001 up in the sky. They're all relatively far apart, but the rain covers almost everywhere. So I copied one into my map and ran a test. The rain seemed to only cover a small area, from a quick glance I'd say a 1024x1024 square. I also noticed that rain fell straight through brushes, props and other world geometry, which of course is a little problematic. Sawmill's rain cuts perfectly around the corners of buildings, and seems to cover a larger, and not-perfectly-square area. To make a long story short, I'm looking for a tutorial on using particle systems in your level, particularly rain. I have been through all 680~something tutorials in the tutorials forum but if there were any there I missed them. If anyone has one, or could point me in the direction of a good one, that would be wonderful Please note, I am not looking to add weather effects or using precipitation within trigger boxes, I am specifically looking to use the particle system to give my level the authentic sawmill feel. Thanks guys!