StaticBatchingHelper.cs

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

[DisallowMultipleComponent]
public class StaticBatchingHelper
    : MonoBehaviour
{
    public void Update()
    {
        var renderers = GetComponentsInChildren<MeshRenderer>();
        var materials = new Dictionary<Material, List<GameObject>>();

        foreach (var renderer in renderers)
        {
            if (renderer.sharedMaterials != null && renderer.sharedMaterials.Length > 1)
                continue;

            var material = renderer.sharedMaterial;
            if (!materials.ContainsKey(material))
                materials.Add(material, new List<GameObject>());

            materials[material].Add(renderer.gameObject);
        }

        foreach (var kv in materials)
        {
            var material = kv.Key;
            var objs = kv.Value;
            var staticBatchRoot = new GameObject(string.Format("StaticCombine [{0}]", kv.Key.name));

            staticBatchRoot.transform.SetParent(transform, false);

            StaticBatchingUtility.Combine(objs.ToArray(), staticBatchRoot);

#if UNITY_EDITOR
            Debug.LogFormat("Batching {0} items to {1}", objs.Count, kv.Key.name);
#endif
        }

        enabled = false;
    }
}