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if you want to turn off the rain reflections on the ground, you just need to do this:
[RAINREFLECTION]
IgnoreWeatherSystem=true
Quality=-2
UseLastFrame=false
EnableWetness=false
WetnessAmountDawn=0.025
WetnessAmountSunrise=0.025
WetnessAmountDay=0.0
WetnessAmountSunset=0.0
WetnessAmountDusk=0.025
WetnessAmountNight=0.025