I just created RainFX
[RAIN_FX]
PUDDLES_MATERIALS = TarmacLightAC,TarmacDarkAC,Rumble1,
SOAKING_MATERIALS =TarmacLightAC,Background,TarmacDarkAC,Dirt 2,Tents1,
ROUGH_MATERIALS = Gravel,Sand1
SMOOTH_MATERIALS = CircuitPau-Arnos,Ferrari,Maserati,BMW,BikeAvenue,mat0,mat8,mat1,mat9,mat3,mat7,mat6,mat5,mat2,mat4,60km/h,mud_ground,ConeOrange,Lightpole1,sponsor1,sponsor2,sponsor3,Traffic Light,Material.001,Podium material,Barriers,mat11,mat10,mat13,ContreteBlock01,guardrail3,guardrail2,Hangars,Rail01,Fence001,TyreBlack,TyreRed,Lightpole1
LINES_MATERIALS = Line White
STREAM_EDGE_... = 7.7, 18.1, -231.84,39.87, 18.7, -177.73
STREAM_EDGE_... = 50, 18.7, -158.73,62.51, 18.7, -133.72
STREAM_EDGE_... = 90.36, 19.44, -73.72,127.98, 19.44, 2.46
STREAM_EDGE_... = 175.64, 29.75, 330.06,173.67, 29.78, 331.52
STREAM_EDGE_... = 74.98, 17.97, 109.34,74.39, 17.87, 107.94
STREAM_EDGE_... = -152.01, 11.51, -406.95,-149.58, 11.46, -406.95
STREAM_EDGE_... = 30.43, 16.73, -161,29.08, 16.77, -160.33
STREAM_EDGE_... = 29.08, 16.77, -160.33,29.85, 16.77, -158.76
STREAM_EDGE_... =29.85, 16.77, -158.76,31.21, 16.73, -159.43
STREAM_EDGE_... =9.39, 17.97, -232.85,7.71, 18.08, -231.85
STREAM_EDGE_... =39.88, 18.69, -177.72,41.58, 18.52, -178.72
STREAM_EDGE_... =51.75, 18.55, -159.63,50.01, 18.7, -158.75
STREAM_EDGE_... =62.62, 18.69, -133.76,64.37, 18.57, -134.64
STREAM_EDGE_... =92.18, 19.28, -74.61,90.37, 19.43, -73.73
STREAM_EDGE_... =127.99, 19.45, 2.46,129.77, 19.29, 1.59
STREAM_EDGE_... =16.62, 17.25, -119.94,17.5, 17.27, -120.4
STREAM_EDGE_... =17.51, 17.25, -120.42,21.92, 17.21, -122.7
STREAM_EDGE_... =21.7, 17.22, -123.15,17.5, 17.23, -120.41