3x3 UpdateGridOnTrigger Supporting MoveWhenFar sorting logic

MoveWhenFar.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System;

// could easily be refactored into a static class...
public class MoveWhenFar : MonoBehaviour {

	readonly static float TerrainSize = 256f;  // D R Y... refactor centrally...

    GameObject[] floorTiles;

	public static List<GameObject> NorthTiles;

	public static List<GameObject> EastTiles;
	
	public static List<GameObject> SouthTiles;

	public static List<GameObject> WestTiles;

    Vector3 middleOffset;

	public static	List<GameObject> CompleteTileList;

	// used to subsort the lists.
	List<GameObject> NSlist;
	List<GameObject> EWlist;

	// for debug
	List<Color> TileColors;

	// Use this for initialization
	void Start () {

		// For Debug only
		TileColors = new List<Color>{Color.red, new Color(1f,.3f,0f), new Color(1f,.6f,0f), new Color(1f,.9f,0f), 
			new Color(1f,1f,.3f),new Color(1f,1f,.6f),new Color(1f,1f,1f)};

        middleOffset = new Vector3(128f, 0f, 128f);  // <-- in case you need to adjust pivots

        floorTiles = GameObject.FindGameObjectsWithTag("Tile");  // <-- For simple identification, there should be 9 of them

		NorthTiles = new List<GameObject>(3);
		EastTiles = new List<GameObject>(3);
		WestTiles =   new List<GameObject>(3);
		SouthTiles = new List<GameObject>(3);

        CompleteTileList = new List<GameObject>(floorTiles);

		NSlist = new List<GameObject>(
			floorTiles
			);
		
		 EWlist = new List<GameObject>(
			floorTiles
			);

		//update lists

		UpdateTilesLists ();

	}

	int maxTilesStackWidth = 3;

	void UpdateTilesLists(){

		// Get the SouthernMost
		NSlist.Sort (delegate(GameObject c1, GameObject c2) {
			return c1.transform.position.z.CompareTo (c2.transform.position.z);	});

		SouthTiles = NSlist.GetRange (0, 3);

		// Get the NorthernMost
		NSlist.Sort (delegate(GameObject c1, GameObject c2) {
			return c2.transform.position.z.CompareTo (c1.transform.position.z);	});
	
		NorthTiles = NSlist.GetRange (0, 3);

		
		EWlist.Sort (delegate(GameObject c1, GameObject c2) {
			return c2.transform.position.x.CompareTo (c1.transform.position.x);	});
		EastTiles = EWlist.GetRange (0, 3);


		EWlist.Sort (delegate(GameObject c1, GameObject c2) {
			return c1.transform.position.x.CompareTo (c2.transform.position.x);	});
		WestTiles = EWlist.GetRange (0, 3);

	}
}