unity3d优化 合并模型网格

using UnityEngine;
using System.Collections;

public class MyClass : MonoBehaviour
{
    void Start ()
    {
        MeshFilter [] meshFilters = GetComponentsInChildren<MeshFilter> ();
        CombineInstance[] combine = newCombineInstance[meshFilters.Length];
        for (int i = 0; i < meshFilters.Length; i++) {
            combine [i].mesh = meshFilters [i].sharedMesh;
            combine [i].transform = meshFilters [i].transform.localToWorldMatrix;
            meshFilters [i].gameObject.active = false;
        }
            transform.GetComponent<MeshFilter> ().mesh = new Mesh ();
            transform.GetComponent<MeshFilter> ().mesh.CombineMeshes (combine);
            transform.gameObject.active = true;
    }
}