I honestly have no idea how to do this... you can't just grab some snow and drop it on the buildings. If you would look at any building in RO2, you will see that most of them don't have snow on them at all, some have textured snow on their ledges, but they are made for that specific building.
I always make the bare bones of the building first, as you see in the screenshots, i did not even paint the ground textures yet, after that more debris, rubble and such will be added to make it more like a destroyed building. because if i immediately add all of it and the building is like not positioned perfectly or something has to change to the building, i got a load of debris or rubble to bother me as well.
You can take a look at some of the wall that have mixture of the wall texture and snow/frozen ice shader materials. You can just copy them and make your own materials by keeping the snow/frozen looking textures and change the textures to the wall to what you like.
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