Actually, snow gets rougher the older it gets! but yes it can be a problem if you want smooth snow and your suggestion of using a second terrain is worth trying. I used the depo map for the snow as an experiment and I'm thinking of adding intersection too! Since I posted this I've added some ice using the flowmap A. First though, I'm working on the background which is easier for my old head then I'll look at smoothing to see if I can make it work and like the result!.
