Keep UVs the same when removing tris

I'm trying to remove the body from a model and leave only the arms for a FPS. This works fine except the UVs get messed up. Any ideas?

Here's the code:

Code (CSharp):

1.     public static void StripArmsQuick(GameObject target) {
2.         if (target == null) {
3.             Debug.Log("No GameObject selected");
4.         }
5.  
6. //        SetTPose(target);
7.  
8.  
9.         Vector3 size = new Vector3(0.45f, 5f, 0.45f);
10.  
11.         Bounds bounds = new Bounds(Vector3.up, size);
12.         SkinnedMeshRenderer[] skinnedMeshRenderers = target.GetComponentsInChildren<SkinnedMeshRenderer>();
13.         foreach (SkinnedMeshRenderer skinnedMeshRenderer in skinnedMeshRenderers) {
14.             List<int> triangleList = new List<int>();
15.             List<Vector3> vertList = new List<Vector3>();
16.             List<Vector2> uvList = new List<Vector2>();
17.             List<Vector3> normalsList = new List<Vector3>();
18.  
19.             Mesh mesh = new Mesh();
20.             mesh.vertices = skinnedMeshRenderer.sharedMesh.vertices;
21.             mesh.normals = skinnedMeshRenderer.sharedMesh.normals;
22.             mesh.uv = skinnedMeshRenderer.sharedMesh.uv;
23.             mesh.boneWeights = skinnedMeshRenderer.sharedMesh.boneWeights;
24.             mesh.bindposes = skinnedMeshRenderer.sharedMesh.bindposes;
25.  
26.             Vector3[] vertices = mesh.vertices;
27.  
28.             for (int i = 0; i < vertices.Length; i++) {
29.                 vertList.Add (vertices[i]);
30.                 uvList.Add (mesh.uv[i]);
31.                 normalsList.Add (mesh.normals[i]);
32.             }
33.  
34.             int[] triangles = mesh.triangles;
35.             for (int i = 0; i < triangles.Length; i += 3) {
36.                 if (bounds.Contains(vertices[triangles[i]]) && bounds.Contains(vertices[triangles[i + 1]]) && bounds.Contains(vertices[triangles[i + 2]])) {
37.                     //In selection
38.                 }
39.                 else {
40.                     triangleList.Add(triangles[i]);
41.                     triangleList.Add(triangles[i + 1]);
42.                     triangleList.Add(triangles[i + 2]);
43.                 }
44.             }
45.  
46.             mesh.triangles = triangleList.ToArray();
47.  
48.             mesh.RecalculateNormals();
49.             mesh.RecalculateBounds();
50.  
51.             skinnedMeshRenderer.sharedMesh = mesh;
52.         }
53.     }

 

I gave up and did it a different way!

Code (CSharp):

1.     public static void HideBody(GameObject target) {
2.         Shader cutoutShader = Shader.Find("Legacy Shaders/Transparent/Cutout/Bumped Diffuse");
3.         if (cutoutShader == null)
4.             Debug.LogError("Cutout shader not found");
5.  
6.         Vector3 size = new Vector3(0.45f, 6f, 0.45f);
7.  
8.         Bounds bounds = new Bounds(Vector3.up, size);
9.         SkinnedMeshRenderer[] skinnedMeshRenderers = target.GetComponentsInChildren<SkinnedMeshRenderer>();
10.         foreach (SkinnedMeshRenderer skinnedMeshRenderer in skinnedMeshRenderers) {
11.             Material[] mats = skinnedMeshRenderer.materials;
12.  
13.             foreach (Material mat in mats)
14.             {
15.                 if (mat.shader != cutoutShader)
16.                 {
17.                     Texture diffuse = mat.GetTexture("_DiffuseMap");
18.                     Texture normal = mat.GetTexture("_NormalsMap");
19.  
20.                     mat.shader = cutoutShader;
21.                     mat.mainTexture = diffuse;
22.                     mat.SetTexture("_BumpMap", normal);
23.                     mat.SetFloat("_Cutoff", 1f);
24.                 }
25.                 Texture2D texture = Instantiate(mat.mainTexture) as Texture2D;
26.                 int width = 10, height = 10;
27.                 Color32[] newColors = new Color32[width*height];
28.                 for (int i = 0; i < newColors.Length; i++)
29.                 {
30.                     newColors[i] = new Color32(0, 255, 0, 0);
31.                 }
32.                 texture.SetPixels32(0, 0, width, height, newColors);
33.                 texture.Apply();
34.                 mat.mainTexture = texture;
35.             }
36.  
37.             Mesh mesh = skinnedMeshRenderer.sharedMesh;
38.             Vector3[] vertices = mesh.vertices;
39.  
40.             int[] triangles = mesh.triangles;
41.             Vector2[] uvs = mesh.uv;
42.             for (int i = 0; i < triangles.Length; i += 3) {
43.                 if (bounds.Contains(vertices[triangles[i]]) && bounds.Contains(vertices[triangles[i + 1]]) && bounds.Contains(vertices[triangles[i + 2]])) {
44.                     uvs[triangles[i]] = new Vector2(0f, 0f);
45.                     uvs[triangles[i+1]] = new Vector2(0.001f, 0f);
46.                     uvs[triangles[i+2]] = new Vector2(0f, 0.001f);
47.                 }
48.                 else {
49.                     //In selection
50.                 }
51.             }
52.             mesh.uv = uvs;
53.             skinnedMeshRenderer.sharedMesh = mesh;
54.         }
55.     }