Rain Droplet Shader?

Hello all. I'm not a programmer nor a shader artist and this has been puzzling me for a bit as I wasn't sure how or where to ask.

I've seen plenty of rain assets on the Unity asset store and I like to combine various assets for the best effect.
For particle weather it's Rain by Kripto289: https://www.assetstore.unity3d.com/en/#!/content/35156
For rain ripples and shallow puddles for static objects like terrains, floors, etc, it's UBER: https://www.assetstore.unity3d.com/en/#!/content/39959

However despite the astounding quality of both these assets for use on static meshes I found that neither had a shader that generates droplets or falling water on dynamic meshes. I'd like to find a shader which can create an effect similar to the picture seen below (A screenshot of Arkham Knight, made with Unreal Engine 4):



So to put it simply: does anybody know of a shader which generates droplets on dynamic meshes/has a water pouring effect visible when an object is more than a 30 degree angle?

Before I published this thread I discovered that there's a since-deprecated asset pack for the shader type I had in mind (for walls, roofs and curved surfaces anyways). A shader for walls in a rainy scene would be great: