Unity导出场景地形网格到.obj文件

using UnityEngine;
using System.Collections;
using System.IO;
using System.Text;
using UnityEditor;
using UnityEditor.SceneManagement;
/// <summary>
/// 描述：导出网格数据到.Obj文件
/// </summary>
public sealed class ExportMesh ｛
    public static void ExportMeshToObj()
    ｛
        GameObject[] roots = EditorUtil.GetRootGameObjects();
        bool isSuccess = false;
        foreach (GameObject gObj in roots)
        ｛
            if (ExportGameObjectMesh(gObj)) isSuccess = true;
        ｝
        EditorUtility.DisplayDialog("提示", isSuccess ? "已成功导出Mesh到.obj文件" : "当前场景没有找到可导出的资源", "OK");
    ｝
    /// <summary>
    /// 导出网格信息
    /// </summary>
    /// <param name="gObj"></param>
    private static bool ExportGameObjectMesh(GameObject gObj)
    ｛
        MeshFilter[] meshFilters = gObj.GetComponentsInChildren<MeshFilter>();
        if (meshFilters == null || meshFilters.Length <= 0) return false;
        int offsetVertice = 0;
        StringBuilder buf = new StringBuilder();
        foreach (MeshFilter mf in meshFilters)
        ｛
            offsetVertice += parseMeshFilter(buf, mf , offsetVertice);
        ｝
        writeObjFile(buf);
        return true;
    ｝
    /// <summary>
    /// 解析MeshFilter数据
    /// </summary>
    /// <param name="buf"></param>
    /// <param name="mf"></param>
    /// <param name="offsetVertices">顶点偏移量</param>
    private static int parseMeshFilter(StringBuilder buf, MeshFilter mf , int offsetVertices)
    ｛
        Mesh mesh = mf.sharedMesh;
        if (!mesh)
        ｛
            Debugger.LogError("<<ExportMesh , parseMeshFilter>> Error !!! Cant find Mesh ! name is " + mf.gameObject.name);
            return 0;
        ｝
        buf.AppendFormat("# ｛0｝.obj" , mf.name );
        buf.AppendLine("#" + System.DateTime.Now.ToLongDateString());
        buf.AppendLine("#" + System.DateTime.Now.ToLongTimeString());
        buf.AppendLine("#-------\n\n");
        buf.AppendFormat("g ｛0｝ \n", mf.name);
        Transform meshTrans = mf.transform;
        Vector3[] allVertices = mesh.vertices;
        foreach (Vector3 vertice in allVertices)
        ｛
            Vector3 v = meshTrans.TransformPoint(vertice);
            buf.AppendFormat("v ｛0｝ ｛1｝ ｛2｝ \n", v.x, v.y, -v.z);
        ｝
        foreach (Vector3 normal in mesh.normals)
        ｛
            Vector3 vn = meshTrans.TransformDirection(normal);
            buf.AppendFormat("vn ｛0｝ ｛1｝ ｛2｝ \n", -vn.x, -vn.y, vn.z);
        ｝
        foreach (Vector2 uv in mesh.uv)
        ｛
            buf.AppendFormat("vt ｛0｝ ｛1｝\n", uv.x, uv.y);
        ｝
        Material[] mats = meshTrans.GetComponent<Renderer>().sharedMaterials;
        for (int i = 0; i < mesh.subMeshCount; i++)
        ｛
            buf.Append("usemtl ").Append(mats[i].name).Append("\n");
            buf.Append("usemap ").Append(mats[i].name).Append("\n");
            int[] triangles = mesh.GetTriangles(i);
            for (int j = 0; j < triangles.Length; j += 3)
            ｛
                buf.AppendFormat("f ｛0｝/｛0｝/｛0｝ ｛1｝/｛1｝/｛1｝ ｛2｝/｛2｝/｛2｝\n",
                    triangles[j] + 1 + offsetVertices, triangles[j + 1] + 1 + offsetVertices, triangles[j + 2] + 1 + offsetVertices);
            ｝
        ｝
        return allVertices.Length;
    ｝
    /// <summary>
    /// 保持OBJ文件
    /// </summary>
    /// <param name="buf"></param>
    private static void writeObjFile(StringBuilder buf)
    ｛
        string filePath = Path.Combine(You_EXPORT_MESH_OBJ_PATH, EditorSceneManager.GetActiveScene().name + ".obj");
        EditorUtil.SwapnDirectory(filePath);
        using (StreamWriter writer = new StreamWriter(filePath))
        ｛
            writer.Write(buf.ToString());
        ｝
    ｝
｝

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.IO;
/// <summary>
/// 描述：工具开发常用工具集
/// </summary>
public sealed class EditorUtil  ｛
    /// <summary>
    /// 获得当前场景的所有根结点
    /// </summary>
    /// <returns></returns>
    public static GameObject[] GetRootGameObjects()
    ｛
        List<GameObject> goList = new List<GameObject>();
        GameObject[] objArr = UnityEngine.Object.FindObjectsOfType<GameObject>();
        foreach (GameObject obj in objArr)
        ｛
            if (obj.transform.parent == null)
                goList.Add(obj);
        ｝
        return goList.ToArray();
    ｝
    /// <summary>
    /// 检测目录是否存在，如果不存在，则创建目录
    /// </summary>
    /// <param name="path"></param>
    public static void SwapnDirectory(string path)
    ｛
        string dir = Path.GetDirectoryName(path);
        if (!Directory.Exists(dir)) Directory.CreateDirectory(dir);
    ｝
｝