Rain - Settings Render quality LOW : Basic refraction rendering. - MEDIUM : Basic rendering plus discard of incorrect refraction. - HIGH : Full refraction with extra reflection sample. Rain speed Speed of the falling. Rain length Length of the raindrop. Rain width Width of the raindrop. Rain transparency Transparency of the overall effect. Rain brightness How brigth is the base color of the raindrop. Rain refraction Intensity of the refraction effect. Rain reflection Transparency of the reflection effect. Splash transparency Transparency of the rain splashes. Splash refraction Intensity of the rain splashes refraction.