Hi Chuck, I received your e-mail but since you posted here, I'll respond here too. Hopefully this will help out others as well. There are a couple of ways to do this: 1) Shader - All you need is a revised shader structure. I've exagerated my mountains. One thing that you'll probably want to do in the terrain editor is Add=>Filter=>Zero Edge Filter to help minimize the variations around the edges. 2) Boolean subtraction - Just convert the terrain into a vertex object. Then in the vertex room, simply create a sphere and do the boolean thing. I have seen some posts that booleans aren't working but that is for the C6.0 release. Things are behaving much better in the C6.0.2 Mark