Hi,

I added a RainDrips texture to RmanCollect,
texture and node in windows versions.


Click image for larger version. 

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-Apply as procedural texture to bump channel, color channel.

-Check "Double Layer" to add a secondary layer of faster small drips.

-Adjust "Strength", "Density", Smooth parameters for the drip shape,
"Rotation" and "Move" Speed for animating,
(main layer needs a minimum of "Rotation Speed").


-"Number of Passes" with "Laps", to get nice drip trails (not used in the above animations),
but at least 10 passes are necessary, so very slow to render (with reflections and/or refractions).


Denis.