Resolved Optimizing texturing of an object.

Hey,
I have in my game a big wall which is generated on runtime and i have it textured by a script:

Code (CSharp):

1.  
2.     Mesh mesh;
3.     Vector2[] uvs;
4.     Vector3[] meshVer;
5.  
6.     void Start()
7.     {
8.         mesh = transform.GetComponent<MeshFilter>().mesh;
9.  
10.         if (mesh.vertices != null && mesh.vertices.Length > 0)
11.             meshVer = mesh.vertices;
12.         else
13.             meshVer = new Vector3[0];
14.     }
15.  
16.     void calculateTexture()
17.     {
18.         uvs = new Vector2[mesh.vertices.Length];
19.         Vector3[] normals = mesh.normals;
20.         for (int i = 0; i < mesh.vertices.Length; i++)
21.         {
22.  
23.             if (Mathf.Abs(normals[i].y) > 0.5f)
24.                 uvs[i] = new Vector2(mesh.vertices[i].x, mesh.vertices[i].z);
25.             else if (Mathf.Abs(normals[i].x) > 0.5f)
26.                 uvs[i] = new Vector2(mesh.vertices[i].z, mesh.vertices[i].y);
27.             else
28.                 uvs[i] = new Vector2(mesh.vertices[i].x, mesh.vertices[i].y);
29.  
30.         }
31.  
32.         mesh.uv = uvs;
33.         mesh.RecalculateNormals();
34.         mesh.RecalculateBounds();
35.         mesh.Optimize();
36.         meshVer = mesh.vertices;
37.  
38.     }
39.  
40.     void Update()
41.     {
42.         if (mesh.vertices != null && mesh.vertices.Length > 0)
43.         {
44.             if (!checkArrays(meshVer, mesh.vertices))
45.             {
46.                 calculateTexture();
47.             }
48.         }
49.     }
50.  
51.     bool checkArrays(Vector3[] arr1, Vector3[] arr2)
52.     {
53.  
54.         if (arr1.Length != arr2.Length)
55.             return false;
56.  
57.         for (int i = 0; i < arr1.Length; i++)
58.         {
59.             if (!(arr1[i].x == arr2[i].x && arr1[i].y == arr2[i].y && arr1[i].z == arr2[i].z))
60.                 return false;
61.         }
62.  
63.         return true;
64.     }
65. }
66.  

It's texturing the wall properly as i want it to be but there is a problem when a player destroys the wall (it's a game about destroying surroundings). As i mentioned the wall is big and when it comes to retexturing the wall (which part of it was destroyed-deleted) it takes too long, because it retextures the whole wall. I was wondering whether it is possible and if so how to make the script retexture only the part of wall which has been destroyed...