unity terrain export to obj

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    import System.IO;    import System.Text;    enum SaveFormat {Triangles, Quads}    enum SaveResolution {Full, Half, Quarter, Eighth, Sixteenth}    class ExportTerrain extends EditorWindow {        var saveFormat = SaveFormat.Triangles;        var saveResolution = SaveResolution.Half;        static var terrain : TerrainData;        static var terrainPos : Vector3;        var tCount : int;        var counter : int;        var totalCount : int;            @MenuItem ("Terrain/Export To Obj...")        static function Init () {            terrain = null;            var terrainObject : Terrain = Selection.activeObject as Terrain;            if (!terrainObject) {                terrainObject = Terrain.activeTerrain;            }            if (terrainObject) {                terrain = terrainObject.terrainData;                terrainPos = terrainObject.transform.position;            }            EditorWindow.GetWindow(ExportTerrain).Show();        }        function OnGUI () {            if (!terrain) {                GUILayout.Label("No terrain found");                if (GUILayout.Button("Cancel")) {                    EditorWindow.GetWindow(ExportTerrain).Close();                }                return;            }            saveFormat = EditorGUILayout.EnumPopup("Export Format", saveFormat);            saveResolution = EditorGUILayout.EnumPopup("Resolution", saveResolution);            if (GUILayout.Button("Export")) {                Export();            }        }        function Export () {            var fileName = EditorUtility.SaveFilePanel("Export .obj file", "", "Terrain", "obj");            var w = terrain.heightmapWidth;            var h = terrain.heightmapHeight;            var meshScale = terrain.size;            var tRes = Mathf.Pow(2, parseInt(saveResolution));            meshScale = Vector3(meshScale.x/(w-1)*tRes, meshScale.y, meshScale.z/(h-1)*tRes);            var uvScale = Vector2(1.0/(w-1), 1.0/(h-1));            var tData = terrain.GetHeights(0, 0, w, h);            w = (w-1) / tRes + 1;            h = (h-1) / tRes + 1;            var tVertices = new Vector3[w * h];            var tUV = new Vector2[w * h];            if (saveFormat == SaveFormat.Triangles) {                var tPolys = new int[(w-1) * (h-1) * 6];            }            else {                tPolys = new int[(w-1) * (h-1) * 4];            }            // Build vertices and UVs            for (y = 0; y < h; y++) {                for (x = 0; x < w; x++) {                    tVertices[y*w + x] = Vector3.Scale(meshScale, Vector3(x, tData[x*tRes,y*tRes], y)) + terrainPos;                    tUV[y*w + x] = Vector2.Scale(Vector2(x*tRes, y*tRes), uvScale);                }            }            var index = 0;            if (saveFormat == SaveFormat.Triangles) {                // Build triangle indices: 3 indices into vertex array for each triangle                for (y = 0; y < h-1; y++) {                    for (x = 0; x < w-1; x++) {                        // For each grid cell output two triangles                        tPolys[index++] = (y     * w) + x;                        tPolys[index++] = ((y+1) * w) + x;                        tPolys[index++] = (y     * w) + x + 1;                        tPolys[index++] = ((y+1) * w) + x;                        tPolys[index++] = ((y+1) * w) + x + 1;                        tPolys[index++] = (y     * w) + x + 1;                    }                }            }            else {                // Build quad indices: 4 indices into vertex array for each quad                for (y = 0; y < h-1; y++) {                    for (x = 0; x < w-1; x++) {                        // For each grid cell output one quad                        tPolys[index++] = (y     * w) + x;                        tPolys[index++] = ((y+1) * w) + x;                        tPolys[index++] = ((y+1) * w) + x + 1;                        tPolys[index++] = (y     * w) + x + 1;                    }                }              }            // Export to .obj            try {                var sw = new StreamWriter(fileName);                sw.WriteLine("# Unity terrain OBJ File");                // Write vertices                System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");                counter = tCount = 0;                totalCount = (tVertices.Length*2 + (saveFormat == SaveFormat.Triangles? tPolys.Length/3 : tPolys.Length/4)) / 1000;                for (i = 0; i < tVertices.Length; i++) {                    UpdateProgress();                    var sb = StringBuilder("v ", 20);                    // StringBuilder stuff is done this way because it's faster than using the "{0} {1} {2}"etc. format                    // Which is important when you're exporting huge terrains.                    sb.Append(tVertices[i].x.ToString()).Append(" ").                       Append(tVertices[i].y.ToString()).Append(" ").                       Append(tVertices[i].z.ToString());                    sw.WriteLine(sb);                }                // Write UVs                for (i = 0; i < tUV.Length; i++) {                    UpdateProgress();                    sb = StringBuilder("vt ", 22);                    sb.Append(tUV[i].x.ToString()).Append(" ").                   Append(tUV[i].y.ToString());                    sw.WriteLine(sb);                }                if (saveFormat == SaveFormat.Triangles) {                    // Write triangles                    for (i = 0; i < tPolys.Length; i += 3) {                        UpdateProgress();                        sb = StringBuilder("f ", 43);                        sb.Append(tPolys[i]+1).Append("/").Append(tPolys[i]+1).Append(" ").                      Append(tPolys[i+1]+1).Append("/").Append(tPolys[i+1]+1).Append(" ").                       Append(tPolys[i+2]+1).Append("/").Append(tPolys[i+2]+1);                        sw.WriteLine(sb);                    }                }                else {                    // Write quads                    for (i = 0; i < tPolys.Length; i += 4) {                        UpdateProgress();                        sb = StringBuilder("f ", 57);                        sb.Append(tPolys[i]+1).Append("/").Append(tPolys[i]+1).Append(" ").                               Append(tPolys[i+1]+1).Append("/").Append(tPolys[i+1]+1).Append(" ").                               Append(tPolys[i+2]+1).Append("/").Append(tPolys[i+2]+1).Append(" ").                               Append(tPolys[i+3]+1).Append("/").Append(tPolys[i+3]+1);                        sw.WriteLine(sb);                    }                      }            }            catch (err) {                Debug.Log("Error saving file: " + err.Message);            }            sw.Close();            terrain = null;            EditorUtility.ClearProgressBar();            EditorWindow.GetWindow(ExportTerrain).Close();        }        function UpdateProgress () {            if (counter++ == 1000) {                counter = 0;                EditorUtility.DisplayProgressBar("Saving...", "", Mathf.InverseLerp(0, totalCount, ++tCount));            }        }    }
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