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：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Media.Imaging;
using System.IO;
using System.Windows.Media.Media3D;
using System.Windows;
namespace ZUI.Tools
{
public class ObjWriter
{
MeshGeometry3D _model;
BitmapSource _texture;
const string SPLITER = "#==================================================================================================";
const string STR_BETWEEN_BLOCKS = "\r\n\r\n\r\n\r\n";
public ObjWriter(MeshGeometry3D modle, BitmapSource texture)
{
_model = modle;
_texture = texture;
}
public void OutPut(string fileName,string fileSafeName)
{
CreatObj(fileName, fileSafeName);
CreatMtl(fileName, fileSafeName);
CreatReadMe(fileName, fileSafeName);
CreatTexture(fileName);
}
public void CreatReadMe(string fileName, string fileSafeName)
{
FileStream fileStream = new FileStream(fileName + "Read Me.txt", FileMode.Create, FileAccess.ReadWrite);
StreamWriter streamWriter = new StreamWriter(fileStream);
streamWriter.WriteLine(SPLITER);
streamWriter.WriteLine("#");
streamWriter.WriteLine("# Those files listed below is auto generated. Please DO NOT edit them ! ");
streamWriter.WriteLine("# You can run the first file in meshlab or 3dmax . But you MUST have all those THREE files !");
streamWriter.WriteLine("# If you have more question please send e-mail to \"[email protected]\".");
streamWriter.WriteLine("#");
streamWriter.WriteLine("# 1. " + fileSafeName);
streamWriter.WriteLine("# 2. " + fileSafeName+".bmp");
streamWriter.WriteLine("# 3. " + fileSafeName+".mtl");
streamWriter.WriteLine("#");
streamWriter.WriteLine("# Thank you ! And have a nice day !");
streamWriter.WriteLine("# Generated Time : " + DateTime.Now.ToString());
streamWriter.WriteLine(SPLITER);
streamWriter.Flush();
streamWriter.Close();
fileStream.Close();
}
private void CreatTexture(string fileName)
{
FileStream fileStream = new FileStream(fileName + ".bmp", FileMode.Create, FileAccess.ReadWrite);
BmpBitmapEncoder encoder = new BmpBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(_texture)) ;
encoder.Save(fileStream);
fileStream.Close();
}
private void CreatMtl(string fileName, string fileSafeName)
{
FileStream fileStream = new FileStream(fileName + ".mtl", FileMode.Create, FileAccess.ReadWrite);
StreamWriter streamWriter = new StreamWriter(fileStream);
streamWriter.WriteLine(SPLITER);
streamWriter.WriteLine("#");
streamWriter.WriteLine("# Warming : This file is auto generated . Please DO NOT edit it ! ");
streamWriter.WriteLine("#");
streamWriter.WriteLine("# Generated Time : " + DateTime.Now.ToString());
streamWriter.WriteLine("#");
streamWriter.WriteLine("# Description :You can open this file in meshlab or 3dmax .");
streamWriter.WriteLine("# If you have more question please send e-mail to \"[email protected]\".");
streamWriter.WriteLine("# This file MUST work with other two files named:\"" + fileSafeName + "\" and \"" + fileSafeName + ".bmp\".");
streamWriter.WriteLine("#");
streamWriter.WriteLine(SPLITER);
streamWriter.WriteLine(STR_BETWEEN_BLOCKS);
streamWriter.WriteLine("newmtl mt1");
streamWriter.WriteLine("Ka 0.0000 0.0000 0.0000");
streamWriter.WriteLine("Kd 0.0000 0.0000 0.0000");
streamWriter.WriteLine("Ks 0.0000 0.0000 0.0000");
streamWriter.WriteLine("Ke 0.9725 0.9725 0.9725");
streamWriter.WriteLine("map_Ka " + fileSafeName + ".bmp");
streamWriter.WriteLine("map_Kd " + fileSafeName + ".bmp");
streamWriter.Flush();
streamWriter.Close();
fileStream.Close();
}
private void CreatObj(string fileName, string fileSafeName)
{
FileStream fileStream = new FileStream(fileName, FileMode.Create, FileAccess.ReadWrite);
StreamWriter streamWriter = new StreamWriter(fileStream);
streamWriter.WriteLine(GetHeadString(fileSafeName));
streamWriter.WriteLine(STR_BETWEEN_BLOCKS);
streamWriter.WriteLine(GetMatralString(fileSafeName));
streamWriter.WriteLine(STR_BETWEEN_BLOCKS);
streamWriter.Write(GetVerticesString());
streamWriter.WriteLine(STR_BETWEEN_BLOCKS);
streamWriter.Write(GetTexturePointString());
streamWriter.WriteLine(STR_BETWEEN_BLOCKS);
streamWriter.Write(GetFaceString());
streamWriter.Flush();
streamWriter.Close();
fileStream.Close();
}
private string GetHeadString(string fileSafeName)
{
StringBuilder result = new StringBuilder();
result.AppendLine(SPLITER);
result.AppendLine("#");
result.AppendLine("# Warming : This file is auto generated . Please DO NOT edit it ! ");
result.AppendLine("#");
result.AppendLine("# Generated Time : "+DateTime.Now.ToString());
result.AppendLine("#");
result.AppendLine("# Description :You can open this file in meshlab or 3dmax .");
result.AppendLine("# If you have more question please send e-mail to \"[email protected]\".");
result.AppendLine("# This file MUST work with other two files named:\"" + fileSafeName + ".mtl\" and \""+fileSafeName+".bmp\".");
result.AppendLine("#");
result.AppendLine(SPLITER);
return result.ToString();
}
private string GetMatralString(string fileSafeName)
{
StringBuilder result = new StringBuilder();
result.AppendLine(SPLITER + "\r\n");
result.AppendLine("# Matral : 1 \r\n");
result.AppendLine("mtllib " + fileSafeName + ".mtl");
result.AppendLine("\r\n# Matral End \r\n");
result.AppendLine(SPLITER );
return result.ToString();
}
private string GetVerticesString()
{
StringBuilder result = new StringBuilder();
result.AppendLine(SPLITER+"\r\n");
result.AppendLine("# Vertices: "+ _model.Positions.Count + "\r\n");
foreach (Point3D p in _model.Positions)
result.AppendLine("v " + p.X + " " + p.Y + " " + p.Z);
result.AppendLine("\r\n# Vertices End");
result.AppendLine("\r\n" + SPLITER);
return result.ToString();
}
private string GetTexturePointString()
{
StringBuilder result = new StringBuilder();
result.AppendLine(SPLITER + "\r\n");
result.AppendLine("# Texture Coordinates: " + _model.TextureCoordinates.Count + "\r\n");
foreach(Point p in _model.TextureCoordinates)
result.AppendLine("vt " + p.X + " " + p.Y + " 0");
result.AppendLine("\r\n# Texture Coordinates End");
result.AppendLine("\r\n" + SPLITER);
return result.ToString();
}
private string GetFaceString()
{
StringBuilder result = new StringBuilder();
result.AppendLine(SPLITER + "\r\n");
result.AppendLine("# Faces: " + _model.TriangleIndices.Count/3 + "\r\n");
result.AppendLine("usemtl mt1" + "\r\n");
for (int i = 0; i < _model.TriangleIndices.Count - 1; i+=3)
{
result.Append("f ");
int p1 = _model.TriangleIndices[i] + 1;
int p2 = _model.TriangleIndices[i + 1] + 1;
int p3 = _model.TriangleIndices[i + 2] + 1;
result.Append(p1 + "/" + p1 + " ");
result.Append(p2 + "/" + p2 + " ");
result.Append(p3 + "/" + p3 + " ");
result.AppendLine();
}
result.AppendLine("\r\n# Faces End");
result.AppendLine("\r\n" + SPLITER);
return result.ToString();
}
}
}
调用方法如下：添加一个按钮
private void ObjOutPut_Click(object sender, RoutedEventArgs e)
{
try
{
if (Modle == null || Modle.Geometry == null)
{
MessageBox.Show("模型不能为空");
return;
}
SaveFileDialog dialog = new SaveFileDialog();
dialog.Filter = "模型(*.obj)|*.obj";
dialog.FileName = Title;
dialog.Title = "保存模型";
double r = sliderrate.Value;
if (dialog.ShowDialog() == true)
{
ObjWriter ow = new ObjWriter(Modle.Geometry as MeshGeometry3D, _texture);
ow.OutPut(dialog.FileName,dialog.SafeFileName);
MessageBox.Show("Output Success !");
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
已验证过，简单易用
转自：http://www.cnblogs.com/GhostZCH/archive/2012/06/14/2549711.html
![中自苏研院2021招聘季开始啦！[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)