CullTriangles.cs

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

public class CullTriangles {
    private static Dictionary<string, bool> triDict;
    private static int[] triangles;
    private static string key;
    private static int[] indices;
    private static List<int> culledTriangles;
    
    
    public static void Cull(Mesh mesh) {
        triangles = mesh.triangles;
        triDict = new Dictionary<string, bool>();
        indices = new int[3];
        culledTriangles = new List<int>();
        
        for(int i=0; i<triangles.Length; i+=3) {
            indices[0] = triangles[i];
            indices[1] = triangles[i+1];
            indices[2] = triangles[i+2];
            System.Array.Sort(indices);
            
            key = indices[0] + "," + indices[1] + "," + indices[2];
            if(!triDict.ContainsKey(key)) {
                triDict.Add(key, true);
                culledTriangles.Add(triangles[i]);
                culledTriangles.Add(triangles[i+1]);
                culledTriangles.Add(triangles[i+2]);
            }
        }
        
        triangles = culledTriangles.ToArray();
        mesh.triangles = triangles;
        
        Debug.Log("CullTriangles::Cull() > Number of triangles after culling:");
        Debug.Log((mesh.triangles.Length / 3).ToString());
        Debug.Log((culledTriangles.Count / 3).ToString());
    }
}