Brain vs. Mountain semifinal: 1-1

Okay, some struggle around the new equation to create a mountain, I have decided to keep the pyramid like mountain code, and upgraded it to be able to put other cubes above it, for example these trees...not much progress, but little time for it. I have written one method in a new interface Surface that will return the surface Height (coordinate Y) for a given X,Z coordinate, and if it is walkable or can have things upon it (so it isn't a steep). Still have to implement it for mountain, but for Plain it will be simple case. :)