I have the following line that is run in a certain loop. I need to make snow, not grass.
workspace.Terrain:SetCell(newx,newy+100,newz,1,0,0)
http://wiki.roblox.com/index.php?title=API:Enum/CellMaterial
The link above details the cellmaterials available, but snow isn't one of them.
How can I set the cell as snow? Or how can I change all my terrain to snow?
That is for legacy (blocky) terrain. Legacy terrain did not have snow material. You may want to use FillBlock instead. For a list of new terrain materials, look at the Material enum.