OK, two confessions to make. Firstly, I have never actually seen snow, lol, I come from a very warm country. Second, I made this shader about two years ago, and I can't remember what all the nodes actually do.

So I am going to spend some time trying to figure out the maths nodes in the shader again, and improving that.

In the meantime, do whatever you can on the python. The main considerations are that we must be able to choose materials. For example, if you have a car in the snow, you don't actually want snow inside the car, so we must have the option to exclude certain materials. Second, we need to be able to set the value of Y in the first post picture to a value between 0 and 1. If we could set the amount of bump on the snow that may help as well. I think we should remove the displacement from the shader though, that worked in the original context of this shader, but it doesn't work that well in the current application.

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