WPF下的3d模型导出,从MeshGeometry3D 导出到 obj 文件
<div id="cnblogs_post_body">MeshGeometry3D时WPF中的一种3d显示类，之前有人发帖解决了从3dmax文件自动生成MeshGeometry3D的方法（http://www.cnblogs.com/enjoyeclipse/archive/2012/03/21/2410439.html）。这里反其道而行发布一种将MeshGeometry3D模型导出到obj文件格式可以使用3dmax打开查看。
内容如下：
<div class="cnblogs_code">1 using System;2 using System.Collections.Generic;3 using System.Linq;4 using System.Text;5 using System.Windows.Media.Imaging;6 using System.IO;7 using System.Windows.Media.Media3D;8 using System.Windows;9 10 namespace ZUI.Tools 11 { 12 public class ObjWriter 13 { 14 MeshGeometry3D _model; 15 BitmapSource _texture; 16 17 const string SPLITER = "#=================================================================================================="; 18 const string STR_BETWEEN_BLOCKS = "\r\n\r\n\r\n\r\n"; 19 20 public ObjWriter(MeshGeometry3D modle, BitmapSource texture) 21 { 22 _model = modle; 23 _texture = texture; 24 } 25 26 public void OutPut(string fileName,string fileSafeName) 27 { 28 CreatObj(fileName, fileSafeName); 29 CreatMtl(fileName, fileSafeName); 30 CreatReadMe(fileName, fileSafeName); 31 CreatTexture(fileName); 32 } 33 public void CreatReadMe(string fileName, string fileSafeName) 34 { 35 FileStream fileStream = new FileStream(fileName + "Read Me.txt", FileMode.Create, FileAccess.ReadWrite); 36 StreamWriter streamWriter = new StreamWriter(fileStream); 37 38 streamWriter.WriteLine(SPLITER); 39 streamWriter.WriteLine("#"); 40 streamWriter.WriteLine("#Those files listed below is auto generated. Please DO NOT edit them !"); 41 streamWriter.WriteLine("#You can run the first file in meshlab or 3dmax . But you MUST have all those THREE files !"); 42 streamWriter.WriteLine("#If you have more question please send e-mail to \"zhao_chenhui_scu@163.com\"."); 43 streamWriter.WriteLine("#"); 44 streamWriter.WriteLine("#1. " + fileSafeName); 45 streamWriter.WriteLine("#2. " + fileSafeName+".bmp"); 46 streamWriter.WriteLine("#3. " + fileSafeName+".mtl"); 47 streamWriter.WriteLine("#"); 48 streamWriter.WriteLine("#Thank you ! And have a nice day !"); 49 streamWriter.WriteLine("#Generated Time : " + DateTime.Now.ToString()); 50 streamWriter.WriteLine(SPLITER); 51 52 streamWriter.Flush(); 53 streamWriter.Close(); 54 fileStream.Close(); 55 } 56 57 private void CreatTexture(string fileName) 58 { 59 FileStream fileStream = new FileStream(fileName + ".bmp", FileMode.Create, FileAccess.ReadWrite); 60 61 BmpBitmapEncoder encoder = new BmpBitmapEncoder(); 62 encoder.Frames.Add(BitmapFrame.Create(_texture)) ; 63 encoder.Save(fileStream); 64 65 fileStream.Close(); 66 } 67 68 private void CreatMtl(string fileName, string fileSafeName) 69 { 70 FileStream fileStream = new FileStream(fileName + ".mtl", FileMode.Create, FileAccess.ReadWrite); 71 StreamWriter streamWriter = new StreamWriter(fileStream); 72 73 streamWriter.WriteLine(SPLITER); 74 streamWriter.WriteLine("#"); 75 streamWriter.WriteLine("# Warming : This file is auto generated . Please DO NOT edit it ! "); 76 streamWriter.WriteLine("#"); 77 streamWriter.WriteLine("# Generated Time : " + DateTime.Now.ToString()); 78 streamWriter.WriteLine("#"); 79 streamWriter.WriteLine("# Description :You can open this file in meshlab or 3dmax ."); 80 streamWriter.WriteLine("# If you have more question please send e-mail to \"zhao_chenhui_scu@163.com\"."); 81 streamWriter.WriteLine("# This file MUST work with other two files named:\"" + fileSafeName + "\" and \"" + fileSafeName + ".bmp\"."); 82 streamWriter.WriteLine("#"); 83 streamWriter.WriteLine(SPLITER); 84 streamWriter.WriteLine(STR_BETWEEN_BLOCKS); 85 86 streamWriter.WriteLine("newmtl mt1"); 87 streamWriter.WriteLine("Ka 0.0000 0.0000 0.0000"); 88 streamWriter.WriteLine("Kd 0.0000 0.0000 0.0000"); 89 streamWriter.WriteLine("Ks 0.0000 0.0000 0.0000"); 90 streamWriter.WriteLine("Ke 0.9725 0.9725 0.9725"); 91 92 streamWriter.WriteLine("map_Ka " + fileSafeName + ".bmp"); 93 streamWriter.WriteLine("map_Kd " + fileSafeName + ".bmp"); 94 95 96 streamWriter.Flush(); 97 streamWriter.Close(); 98 fileStream.Close(); 99 }100 101 private void CreatObj(string fileName, string fileSafeName)102 {103 FileStream fileStream = new FileStream(fileName, FileMode.Create, FileAccess.ReadWrite);104 StreamWriter streamWriter = new StreamWriter(fileStream);105 106 streamWriter.WriteLine(GetHeadString(fileSafeName));107 streamWriter.WriteLine(STR_BETWEEN_BLOCKS);108 109 streamWriter.WriteLine(GetMatralString(fileSafeName));110 streamWriter.WriteLine(STR_BETWEEN_BLOCKS);111 112 streamWriter.Write(GetVerticesString());113 streamWriter.WriteLine(STR_BETWEEN_BLOCKS);114 115 streamWriter.Write(GetTexturePointString());116 streamWriter.WriteLine(STR_BETWEEN_BLOCKS);117 118 streamWriter.Write(GetFaceString());119 120 streamWriter.Flush();121 streamWriter.Close();122 fileStream.Close();123 }124 125 private string GetHeadString(string fileSafeName)126 {127 StringBuilder result = new StringBuilder();128 129 result.AppendLine(SPLITER);130 result.AppendLine("#");131 result.AppendLine("# Warming : This file is auto generated . Please DO NOT edit it ! ");132 result.AppendLine("#");133 result.AppendLine("# Generated Time : "+DateTime.Now.ToString());134 result.AppendLine("#");135 result.AppendLine("# Description :You can open this file in meshlab or 3dmax .");136 result.AppendLine("# If you have more question please send e-mail to \"zhao_chenhui_scu@163.com\".");137 result.AppendLine("# This file MUST work with other two files named:\"" + fileSafeName + ".mtl\" and \""+fileSafeName+".bmp\".");138 result.AppendLine("#");139 result.AppendLine(SPLITER);140 141 return result.ToString();142 }143 144 private string GetMatralString(string fileSafeName)145 {146 StringBuilder result = new StringBuilder();147 148 result.AppendLine(SPLITER + "\r\n");149 result.AppendLine("#Matral : 1\r\n");150 result.AppendLine("mtllib " + fileSafeName + ".mtl");151 result.AppendLine("\r\n#Matral End \r\n");152 result.AppendLine(SPLITER );153 154 return result.ToString();155 }156 157 private string GetVerticesString()158 {159 StringBuilder result = new StringBuilder();160 161 result.AppendLine(SPLITER+"\r\n");162 result.AppendLine("#Vertices: "+ _model.Positions.Count + "\r\n");163 164 foreach (Point3D p in _model.Positions)165 result.AppendLine("v " + p.X + " " + p.Y + " " + p.Z);166 167 result.AppendLine("\r\n#Vertices End");168 result.AppendLine("\r\n" + SPLITER);169 170 return result.ToString();171 }172 173 private string GetTexturePointString()174 {175 StringBuilder result = new StringBuilder();176 177 result.AppendLine(SPLITER + "\r\n");178 result.AppendLine("#Texture Coordinates: " + _model.TextureCoordinates.Count + "\r\n");179 180 foreach(Point p in _model.TextureCoordinates)181 result.AppendLine("vt " + p.X+ " " + p.Y + " 0");182 183 184 result.AppendLine("\r\n#Texture Coordinates End");185 result.AppendLine("\r\n" + SPLITER);186 187 return result.ToString();188 }189 190 private string GetFaceString()191 {192 StringBuilder result = new StringBuilder();193 194 result.AppendLine(SPLITER + "\r\n");195 result.AppendLine("#Faces: " + _model.TriangleIndices.Count/3 + "\r\n");196 result.AppendLine("usemtl mt1" + "\r\n");197 198 for (int i = 0; i < _model.TriangleIndices.Count - 1; i+=3)199 {200 201 result.Append("f ");202 203 int p1 = _model.TriangleIndices + 1;204 int p2 = _model.TriangleIndices1] + 1;205 int p3 = _model.TriangleIndices2] + 1;206 207 result.Append(p1 + "/" + p1 + " ");208 result.Append(p2 + "/" + p2 + " ");209 result.Append(p3 + "/" + p3 + " ");210 211 result.AppendLine();212 }213 214 result.AppendLine("\r\n#Faces End");215 result.AppendLine("\r\n" + SPLITER);216 217 return result.ToString();218 }219 }220 }
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