using UnityEditor;
using UnityEngine;
using System.IO;
using System.Text;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;

public class CombineMeshes : Editor
{
	private static GameObject targetMesh;
	private static string savedName = "_mesh";
	// 工具栏新增按钮 
	[MenuItem("My Tools/Combine Selected Mesh", false, 100)]
	// 合并模型
	public static void CombineSelectedMesh()
	{
		//要处理的目标模型 所有要合并的模型需要放在该模型下
		targetMesh = Selection.activeGameObject;//GameObject.Find("Cube11");
												//获取自身和所有子物体中MeshRenderer组件
		MeshRenderer[] meshRenderers = targetMesh.GetComponentsInChildren<MeshRenderer>();

		//新建材质球数组
		Material[] materialList = new Material[meshRenderers.Length];
		for (int i = 0; i < meshRenderers.Length; i++)
		{
			//生成材质球数组 
			materialList[i] = meshRenderers[i].sharedMaterial;
		}
		// 合并mesh
		//获取自身和所有子物体中所有MeshFilter组件
		MeshFilter[] meshFilters = targetMesh.GetComponentsInChildren<MeshFilter>();

		// 合并器
		CombineInstance[] combine = new CombineInstance[meshFilters.Length];

		// 
		for (int i = 0; i < meshFilters.Length; i++)
		{
			// 合并模型
			combine[i].mesh = meshFilters[i].sharedMesh;
			//还原坐标状态
			combine[i].transform = meshFilters[i].transform.localToWorldMatrix;
			// 隐藏源模型模型
			meshFilters[i].gameObject.SetActive(false);
		}
		//新建一个物体   to saving combined mesh
		GameObject g = new GameObject();
		g.transform.name = targetMesh.transform.name + savedName;
		//物体和mesh来源物体同级
		g.transform.SetParent(targetMesh.transform.parent);
		//设置排序
		g.transform.SetSiblingIndex(targetMesh.transform.GetSiblingIndex() + 1);
		// 新建mesh
		g.AddComponent<MeshFilter>().mesh = new Mesh();
		//合并Mesh. 第二个参数:true合并为一个网格. false合并为子网格
		g.GetComponent<MeshFilter>().sharedMesh.CombineMeshes(combine, false);
		// set avaliable be true
		g.gameObject.SetActive(true);

		//为合并后的新Mesh指定材质 
		g.AddComponent<MeshRenderer>().sharedMaterials = materialList;
	}

	//点击该按钮 保存网格资源到Asset目录
	[MenuItem("My Tools/Save Selected Mesh To Asset", false, 101)]
	public static void SaveSelectedMeshToAsset()
	{
		Mesh mesh = Selection.activeGameObject.GetComponent<MeshFilter>().sharedMesh;
		AssetDatabase.CreateAsset(mesh, "Assets/" + targetMesh.transform.name + savedName + ".asset");
		AssetDatabase.SaveAssets();
	}
}