This is another screenshot. This is a terrain type I named "Old World".
These rocks appear older. When I get back to working on the trees and vegetation, this will be a good terrain type for a large forest.
The engine is able to deal with transitions between different types of terrain quite well. Different terrain layers get mixed depending on how strong they are. For instance, large volcanic rocks will still appear through the sand in a desert as long as the rocks are near the volcanic zones.
I still need to work on making the actual materials more sensitive to other zones. For instance, grass near a desert zone should be dryer. Right now patches of grass may appear in the boundary between a desert and a forest. This is alright, but the grass should not be as healthy as it is in the middle of the forest.