Hi, In the second diagram to the right is how I wanted it to look like.Transparent above ground, brown below ground until you get to a specific point when the material changes color inline with the background (harder rock) (grey). Then to maintain this color until you get to end of the background at which point the mesh will be transparent again. It is working as I wanted in the editor which is illustrated in the 2nd diagram with the material set up and game editor illustration. The problem is when I deploy to IOS the mesh is rendered completely black.
thanks for your help
David