I would recommend using 2 or 3 layers of animated sprite billboards that surround the camera in a box. Plan them like a cloud layer, where the different depths move at different speeds.

I havent tried this theory, but I would expect it to render much faster than a model of rain.

On the other hand, particles may be the way to go, depending on how well A5 handles them.

Just my 2 cents...

-Aaron Sallade

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