{"id":518,"date":"2010-03-27T15:19:14","date_gmt":"2010-03-27T15:19:14","guid":{"rendered":""},"modified":"2013-02-27T12:22:23","modified_gmt":"2013-02-27T04:22:23","slug":"518","status":"publish","type":"post","link":"https:\/\/1vr.cn\/?p=518","title":{"rendered":"\u5c06Unity3D\u4e2d\u7684\u5730\u5f62\u5bfc\u51fa\u4e3a*.Obj\u6a21\u578b\u6587\u4ef6"},"content":{"rendered":"

\u5c06\u4e0b\u9762\u7684\u811a\u672c\u653e\u5728\u4f60\u9879\u76ee\u76ee\u5f55\u4e0b\u8d44\u6e90\u6587\u4ef6\u5939\u7684Editor\u91cc.
\u8981\u5bfc\u51fa\u5730\u5f62,\u9996\u5148\u5728\u4f60\u7684\u573a\u666f\u4e2d\u9009\u4e2d\u5730\u5f62\u5bf9\u8c61.\u5982\u679c\u6ca1\u9009,\u4ed6\u5c06\u7528\u4e8e\u5f53\u524d\u573a\u666f\u4e2d\u53ef\u7528\u7684\u5730\u5f62.\u4eceTerrain\u83dc\u5355\u4e0b\u9009\u62e9Export To Obj… ,\u5728\u5206\u8fa8\u7387\u7a97\u53e3,\u9009\u62e9\u4f60\u8981\u56db\u8fb9\u5f62\u8fd8\u662f\u4e09\u89d2\u5f62\u7f51\u683c\u7ed3\u6784.\u540c\u6837\u4e5f\u53ef\u4ee5\u9009\u62e9\u8981\u5bfc\u51fa\u5730\u5f62\u7684\u5206\u8fa8\u7387,\u6709\u9ad8\u4e2d\u4f4e\u7b49\u7b49.\u70b9\u51fbExport,\u9009\u62e9\u8981\u4fdd\u5b58\u7684\u4f4d\u7f6e\u548c\u6587\u4ef6\u540d.Obj\u6587\u4ef6\u5c06\u88ab\u5bfc\u51fa.\u8981\u6ce8\u610f\u5982\u679c\u9009\u62e9\u5927\u9762\u79ef\u7684Full\u5730\u5f62\u5bfc\u51fa,\u6700\u7ec8\u7684Obj\u6587\u4ef6\u5c06\u975e\u5e38\u5927,\u800c\u4e14\u4e5f\u8981\u5bfc\u51fa\u5f88\u4e45.<\/p>\n

\u4e0b\u9762\u4e3aExportTerrain.js\u811a\u672c.<\/p>\n

import System.IO;
import System.Text;<\/p>\n

enum SaveFormat {Triangles, Quads}
enum SaveResolution {Full, Half, Quarter, Eighth, Sixteenth}<\/p>\n

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));
        }
    }
}
<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

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