Meshcombine.cs

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using UnityEngine;
using System.Collections;

[RequireComponent(typeof(MeshFilter))]
[RequireComponent(typeof(MeshRenderer))]
public class Meshcombine : MonoBehaviour {
    void Start() {

    }
    
    public void GoOn()
    {
         MeshFilter[] meshFilters = GetComponentsInChildren<MeshFilter>();
        CombineInstance[] combine = new CombineInstance[meshFilters.Length];
        int i = 0;
        while (i < meshFilters.Length) {
            combine[i].mesh = meshFilters[i].sharedMesh;
            combine[i].transform = meshFilters[i].transform.localToWorldMatrix;
//            meshFilters[i].gameObject.active = false;
            meshFilters[i].gameObject.SetActive(false);
            i++;
        }
        transform.GetComponent<MeshFilter>().mesh = new Mesh();
        transform.GetComponent<MeshFilter>().mesh.CombineMeshes(combine);
//        transform.gameObject.active = true;    
        transform.gameObject.SetActive(true);    
    }
    
}