TPW RAINFX - Rain droplet fx

Author: tpw
Requires: Community Base Addons A3
Compatibility: SP only

Description
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A small addon that simulates raindrops falling on exposed surfaces (ground, road, most objects) / player goggles / vehicle windows, for a subtle immersion increase during rain, with little FPS cost. 

	- Simulates the splash on exposed surfaces where a raindrop hits.
	- Droplets on vehicle windows, with increasing numbers as the vehicle's speed increases.
	- Droplet on player goggles.
	- More droplets as rainfall intensity and player speed increases.
	- No ground/goggle droplets when player moves under cover.

How it works
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Goggle and window fx are derived by attaching a refract particle emitter box to the player when not under cover. 

Exposed surface fx are more complicated. Random positions are calculated in a 40 degree arc up to 3 m from the player. Each random position is 50 m above the ground. Particle drops are spawned on the first surface directly below the random position, whether it be an object or the ground. This results in raindrop splashes on the roof of a car or building, but not inside or under it. Splashes should be visible on most object and surface types.   	
	
Issues
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The particle based fx in this mod go some way to improving immersion in wet weather, but Arma3 desperately needs an overhaul of the way it visually* handles wet weather fx to bring it into line with most games released in the last 5+ years, especially changes to specularity of surface and object textures to simulate wetness.  

*Sonically the rain fx on Tanoa are inspiring.