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This is a paid asset, but now you can download RainShelter Free.
Detail this asset from Unity Store: Original Link
RainShelter v1.0
RainShelter is a plugin to make your rain effects to look better and more convincing by shaping its volume according to the scene geometry, dynamically.
Just place the scripts and layer your objects accordingly.
No advanced triggers or complex rain emitter volumes required.
You can even tilt your rain direction, the system will adapt to it in real-time!
Thank you!