Had a go at making a rain shader /material function. This effect is applicable to any material - since it's built as a material function.
Huge shout out to DeepSpaceBanana Art, who's blog pretty much made this possible for me.
So much fun, and so many lessons learned. Especially with VFX/shader creation using Substance.
I probably want to re-visit this subject sometime in the future - feels like there's a more efficient way to achieve a similar result.