[dsd]

using UnityEngine;
using System.Collections;

public class NewBehaviourScript : MonoBehaviour {
	System.Random randGen;
	int[,] data;
	int width = 128;
	
	// Use this for initialization
	void Start () {
	randGen = new System.Random(100500);
		data = new int[width,width];
			for(int i=0; i<width; i++){
				for(int j=0; j<width; j++){
				data[i,j] = randGen.Next(0,4);
			}}
		Debug.Log(data[10,15]);
	}
	
	// Update is called once per frame
	void Update () {
	
	}
}

не оно?