Thanks for all of your help Monsoon. Well still not anywhere near Peten's work, but at least I'm learning a lot. I still have only 2 materials here. I still need to add the 3rd material to the lower part of the mountain, but I can't seem to get the snow to stay at the tops of the mountains or at least half way up the mountains. I tried to use a gradient to do this but the gradient made the left half of the terrain snow and the right half rock, but I need the gradient to work vertically. I even tried rotating the gradient but it still didn't work. Any ideas how I can use a gradient in the Function Editor to keep the snow half way up the mountain? or are there any other ways to do this? After I get the snow where I want it I will mix this material with the grass like you suggested. Thanks