3x3 UpdateGridOnTrigger example

UpdateGridOnTrigger.cs

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

public class UpdateGridOnTrigger : MonoBehaviour {
	MonoBehaviour script;

	readonly static float TerrainSize = 256f; // set this
	
	void Start(){

		// Get script references
		script = GetComponent<MoveWhenFar>();  // Refactor to a single static reference perhaps
	}

	bool isContainedInList(GameObject obj, List<GameObject> list){
		return list.Contains(obj);
	}

	void OnTriggerEnter(){
		// do this based on Lists
		// North / South, East / West Lists

		/*
		 *  check the lists - 
		 *  Prefer North / South over East West (doesn't matter)
		 *  Corners are now implicitly handled by simply testing both lists
		 */

		// North
		if (isContainedInList(gameObject, MoveWhenFar.NorthTiles)) {

				// Move south tiles North and update the tags.
				for (int i = 0; i < MoveWhenFar.SouthTiles.Count; i++) {

					MoveWhenFar.SouthTiles[i].transform.position = new Vector3(
						MoveWhenFar.SouthTiles[i].transform.position.x,
						MoveWhenFar.SouthTiles[i].transform.position.y,
						MoveWhenFar.SouthTiles[i].transform.position.z + (3* TerrainSize));

			// Center
			}

		//North
		}


		// South
		if (isContainedInList(gameObject, MoveWhenFar.SouthTiles)) {
			

				// Move north tiles South and update the tags.
				for (int i = 0; i < MoveWhenFar.NorthTiles.Count; i++) {
					
					MoveWhenFar.NorthTiles[i].transform.position = new Vector3(
						MoveWhenFar.NorthTiles[i].transform.position.x,
						MoveWhenFar.NorthTiles[i].transform.position.y,
					MoveWhenFar.NorthTiles[i].transform.position.z - (3* TerrainSize));
				}
				

			
			//South
		}

		// East
		if (isContainedInList(gameObject, MoveWhenFar.EastTiles)) {

				// Move West tiles East and update the tags.
				for (int o = 0; o < MoveWhenFar.WestTiles.Count; o++) {
					
					MoveWhenFar.WestTiles[o].transform.position = new Vector3(
					MoveWhenFar.WestTiles[o].transform.position.x + (3* TerrainSize),
						MoveWhenFar.WestTiles[o].transform.position.y,
						MoveWhenFar.WestTiles[o].transform.position.z );
					
			}	
			//East
		}
		
		// West
		if (isContainedInList(gameObject, MoveWhenFar.WestTiles)) {

				// Move south tiles North and update the tags.
				for (int i = 0; i < MoveWhenFar.EastTiles.Count; i++) {
					
					MoveWhenFar.EastTiles[i].transform.position = new Vector3(
					MoveWhenFar.EastTiles[i].transform.position.x - (3* TerrainSize),
						MoveWhenFar.EastTiles[i].transform.position.y,
						MoveWhenFar.EastTiles[i].transform.position.z );
					
				}

			//West
		}

        if (script == null)
            return;
		script.SendMessage ("UpdateTilesLists", SendMessageOptions.DontRequireReceiver);
	//Ontrigger
	}
}