Maze Generation

Hi,
I'm creating a small random maze with an algorithm, which in a way works, but it seems i must be doing something very inneficiently or illegal in unity for whenever i try to create a maze that is "large", as in bigger than 6x6 unity will stop responding.
What is weird is that if i create a 5x5 maze then create a 6x6 then a 7x7 (all in their own different game sessions, never together) unity doesn't crash, and i tried this up to 13*13. But if i open up unity and create a large maze directly it crashes. Does anyone know any reason this could be? Any other criticism of the code is greatly appreciated (this is all based on js)

Code (JavaScript):

1. var CellFloor : Transform;
2. var Wall : Transform;
3.  
4.  
5. var SizeX2 = 2;                //X and Y size of maze
6. var SizeY2 = 2;
7. var Xmaze = 0;                //location of current cell we are at
8. var Ymaze = 0;
9. var counter = 1;            //counting how many different cells we have visited
10. var update = false;            //should we update lastX and lastY
11. var lastX = new Array();    //array of cells where there was another possible path
12. var lastY = new Array();  
13. var walls = new Array(SizeX2);
14. for (var x =0; x<SizeX2; x++) {
15.     walls[x] = new Array(SizeY2);
16.     for (var y=0; y<SizeY2; y++){
17.     walls[x][y]= new Array();
18.     walls[x][y].push(0,"East","South","West","North");
19.     }
20. }
21.  
22.    
23. function Start () {
24.     while (counter <SizeX2*SizeY2){
25.            print("counter :" +counter);
26.         print("X :" +Xmaze);
27.         print("Y :" +Ymaze);
28.        
29.         if (walls[Xmaze][Ymaze][0]!=1){
30.             walls[Xmaze][Ymaze][0]=1;
31.             print(" should be x  y : "+Xmaze+" "+Ymaze);
32.             counter++;
33.             }
34.          var neighbour = find_neighbour(Xmaze,Ymaze);
35.         next_neighbour(neighbour);
36.     }
37.     draw();
38. }
39.  
40.  
41. function Update () {
42.  
43. }
44.  
45.  
46. function next_neighbour(neighbour){
47.        if (neighbour!= null){
48.             walls[Xmaze][Ymaze][0]=1;
49.             if (update == true){
50.                 lastX.push(Xmaze);
51.                 lastY.push(Ymaze);
52.                 update = false;
53.                   }
54.             if (neighbour=="East"){Xmaze++; walls[Xmaze][Ymaze].remove("West");}
55.             else if (neighbour=="South"){Ymaze--; walls[Xmaze][Ymaze].remove("North");}
56.             else if (neighbour=="West"){Xmaze--; walls[Xmaze][Ymaze].remove("East");}      
57.             else if (neighbour=="North"){Ymaze++; walls[Xmaze][Ymaze].remove("South");}
58.         }
59.         else{  
60.                 print("XXXXX "+ lastX);
61.                 print("XXXXX "+ lastY);
62.                 Xmaze = lastX[lastX.length-1];
63.                 Ymaze = lastY[lastY.length-1];
64.                 lastX.RemoveAt(lastX.length-1);
65.                 lastY.RemoveAt(lastY.length-1);
66.         }          
67. }
68. function find_neighbour(x2, y2) {
69.        w = new Array();
70.        if (hasEast(x2,y2)) w.push("East");
71.        if (hasSouth(x2,y2)) w.push("South");
72.        if (hasWest(x2,y2))w.push("West");
73.        if (hasNorth(x2,y2))w.push("North");
74.      
75.        if (w.length==0) return null;
76.        if (w.length>1) update = true;
77.        var indexOfW = parseInt(Random.Range(0,w.length));
78.        var whichWall = w[indexOfW];
79.        walls[x2][y2].remove(whichWall);
80.        return whichWall;
81. }
82.  
83.  
84. function hasNorth(x2, y2) {
85.         if ( y2+1 > SizeY2-1) return false;
86.         if (walls[x2][y2+1][0]!=1)return true;
87.         return false;
88. }
89. function hasSouth(x2, y2) {
90.         if ( y2-1 < 0 ) return false;
91.         if (walls[x2][y2-1][0]!=1)return true;
92.         return false;
93. }
94. function hasEast( x2, y2) {
95.         if ( x2+1 > SizeX2-1 ) return false;
96.         if (walls[x2+1][y2][0]!=1) return true;
97.         return false;
98. }
99. function hasWest( x2, y2) {
100.         if ( x2-1 < 0 ) return false;
101.         if (walls[x2-1][y2][0]!=1) return true;
102.         return false;
103. }
104. function draw(){
105.         for (var i =0; i<SizeX2; i++) {
106.             for (var j =0; j<SizeY2; j++) {
107.                 for(var s =1; s<walls[i][j].length;s++){
108.                     if(walls[i][j][s]=="East") Instantiate (Wall , Vector3((i * 6)+3, 0, j * 6),  Quaternion.Euler(90, -90, 0));
109.                     else if(walls[i][j][s]=="South") Instantiate (Wall , Vector3(i * 6, 0, (j * 6)-3), Quaternion.Euler(90, 0, 0));
110.                     else if(walls[i][j][s]=="West")  Instantiate (Wall , Vector3((i * 6)-3, 0, j * 6), Quaternion.Euler(90, 90, 0));
111.                     else if(walls[i][j][s]=="North") Instantiate (Wall , Vector3(i * 6, 0, (j * 6)+3), Quaternion.Euler(90, 180, 0));
112.                 }
113.                    Instantiate (CellFloor , Vector3(i * 6, 0, j * 6), Quaternion.identity);
114.             }
115.         }
116. }

 

I'm not sure my message was very clear so if you need any other info, tell me

 

I'll try and have a look when I have time, in the meantime, there's this great tutorial for a maze.

http://catlikecoding.com/unity/tutorials/maze/

His other tutorials: http://forum.unity3d.com/threads/catlike-codings-c-tutorials.98761/