This geometry was created from a simple 2D Array using THREE.js

Try to compare the 2D array with the Mesh

var terrain = [
	[3, 2, 2, 5, 8],
	[2, 1, 2, 3, 6],
	[1, 1, 1, 2, 4],
	[1, 1, 1, 3, 4],
	[1, 1, 1, 4, 4]
];