Colliders (collection) - collection of objects for rain to collide with.
Z Cutoff (float) - z value under which rain will be automatically deleted.
Density (float) - rain particles spawned per area.
Size (float) - radius of rain particles.
Direction (vector) - direction of rain velocity.
Speed (float) - scales the direction vector.
Randomize (float) - add randomization to the direction.
Droplets (integer) - Number of particles generated on splash.
Lifespan (integer) - Average frame lifespan of splash particles.
Speed (float) - Emission speed of splash particles.