unity3D导出OBJ代码(2019，支持地形)

// Converted from UnityScript to C# at http://www.M2H.nl/files/js_to_c.php - by Mike Hergaarden
// C # manual conversion work by Yun Kyu Choi
 
using UnityEngine;
using UnityEditor;
using System;
using System.Collections;
using System.IO;
using System.Text;
 
enum SaveFormat { Triangles, Quads }
enum SaveResolution { Full=0, Half, Quarter, Eighth, Sixteenth }
 
class ExportTerrain : EditorWindow
{
   SaveFormat saveFormat = SaveFormat.Triangles;
   SaveResolution saveResolution = SaveResolution.Half;
 
   static TerrainData terrain;
   static Vector3 terrainPos;
 
   int tCount;
   int counter;
   int totalCount;
   int progressUpdateInterval = 10000;
 
   [MenuItem("Terrain/Export To Obj...")]
   static void Init()
   {
      terrain = null;

      Terrain terrainObject = Selection.activeObject as Terrain;
      if (!terrainObject)
      {
         terrainObject = Terrain.activeTerrain;
      }
      if (terrainObject)
      {
         terrain = terrainObject.terrainData;
         terrainPos = terrainObject.transform.position;
      }
 
      EditorWindow.GetWindow<ExportTerrain>().Show();
   }
 
   void OnGUI()
   {
      if (!terrain)
      {
         GUILayout.Label("No terrain found");
         if (GUILayout.Button("Cancel"))
         {
            EditorWindow.GetWindow<ExportTerrain>().Close();
         }
         return;
      }
      saveFormat = (SaveFormat) EditorGUILayout.EnumPopup("Export Format", saveFormat);
 
      saveResolution = (SaveResolution) EditorGUILayout.EnumPopup("Resolution", saveResolution);
 
      if (GUILayout.Button("Export"))