There's no texture for the rain, it's generated mathematically, the parameters are stored in scene.dat, here's the values you can change
Rain
RandomWind (Random wind parameters)
--ChangeTimeMin (The minimum time after which the random wind changes)
--ChangeTimeMax (The maximum time after which the random wind changes)
--RandomWindSpeedMax (The maximum intensity of the random wind)
--RandomWindSpeedVariationSpeed (The speed of intensity change for random wind)
--RandomWindHeadingVariationSpeed (The speed of heading change for random wind)
DropsNumber (Total number of rain drops)
FallSpeed (Rain drop fall speed)
RainIntensityChangeSpeed (The speed of change for rain intensity)
MinSize (Rain drop minimum size)
MaxSize (Rain drop maximum size)
HeadColor (The color of the start of the drop)
HeadAlpha (The alpha of the start of the drop)
TailColor (The color of the end of the drop)
TailAlpha (The alpha of the end of the drop)
Ref
__________________
|