Okay so the rain in the latest DEV build looks great, it's just miss some very basic things.
-Terrain, vegetation, uniforms, vehicles and structures should become more shiny and wet looking. As it is now it's only a little bit more dim than when not raining. But of course only after some time has passed by with rain, or that the mission starts with heavy rain. Caustics(reflected light rays) turned on would result in light rays being reflected in a wet road.
-Tiny splashes where the rain land, both on ground and structures, vehicles etc.
-Sounds that indicate that you are stepping in water, mud etc.
-Reduced hearing for AI, because a storm makes quite a lot of noise(affects player already).
-Wind needs to make more drastic change in direction of the raindrops than it does now already, and gusts as well.
-Slippery surfaces, variation in how slippery it is. Example: Runways for planes are build to lead water away therefore they are not extra slippery when wet, off-road is madness in civilian vehicles, roads vary dependent on the amount of water on them and the angle.
-Also some kind of effect on windshields and vehicle surfaces would fit in, but a bit extreme for a game like Arma III... maybe in the 4th
-There seems to be an issue when changing aperture and during night if you face a big explosion, the rain becomes black and blocks your visibility... look da pics.
-Currently when time is paused raindrops are horizontal, it's not the big deal but should be fixable.
-Aaaand wet stuff weights more.
-Probably a lot more {F22635} {F22636}