Here’s a quick guide on how to apply rain to your project

1st : Place the “BP_SimpleRain” component into your level. Make sure to have it’s position and rotation set to 0.

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2nd step : Add the “BP_SimpleRain_Niagara” to your Character Pawn

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3rd step : Place the “MF_SimpleRain_Main” material function inside the materials you want to be affected by wetness.

If the object is dynamic (Character,Weapons) Check the check box “Is Dynamic Object” in the material instance.

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And that’s it you good to go. You can control the amount of rain and wetness through the blueprint.