Snow shader v2.

I've been working on the old snow shader to try to improve the appareance of all the stuff which will be snowed in the short film.
I'm happy with the results for now but I'll keep investigating about snow stuff.
Find below some test and examples.

My original idea is to have different controls for general snow, crystallization areas, icy areas and bump and displacement as well.

ps: The airplane model doesn't belong to I Like You.

Click images to enlarge.