Unity寻路探究之Unity导出Recast寻路的obj数据

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/Rhett_Yuan/article/details/79483387

      继上一篇编译过Recast源码之后，已经顺利运行起来我们的寻路工具，默认的数据目录下有两个dungeon.obj和nav_test.obj两个数据，因此我们看到RecastDemo用的数据是obj格式的，那么怎样从Unity中导出我们要用的obj数据呢

        从wiki源码上下载这两个文件ObjExporter.cs和EditorObjExporter.cs（点击打开链接），放在自己工程的Editor目录下，选择一个网格对象，在菜单栏中选择导出即可，查看ObjExporter文件源码

using UnityEngine;
using System.Collections;
using System.IO;
using System.Text;
 
public class ObjExporter {
 
    public static string MeshToString(MeshFilter mf) {
        Mesh m = mf.mesh;
        Material[] mats = mf.renderer.sharedMaterials;
 
        StringBuilder sb = new StringBuilder();
 
        sb.Append("g ").Append(mf.name).Append("\n");
        foreach(Vector3 v in m.vertices) {
            sb.Append(string.Format("v {0} {1} {2}\n",v.x,v.y,v.z));
        }
        sb.Append("\n");
        foreach(Vector3 v in m.normals) {
            sb.Append(string.Format("vn {0} {1} {2}\n",v.x,v.y,v.z));
        }
        sb.Append("\n");
        foreach(Vector3 v in m.uv) {
            sb.Append(string.Format("vt {0} {1}\n",v.x,v.y));
        }
        for (int material=0; material < m.subMeshCount; material ++) {
            sb.Append("\n");
            sb.Append("usemtl ").Append(mats[material].name).Append("\n");
            sb.Append("usemap ").Append(mats[material].name).Append("\n");
 
            int[] triangles = m.GetTriangles(material);
            for (int i=0;i<triangles.Length;i+=3) {
                sb.Append(string.Format("f {0}/{0}/{0} {1}/{1}/{1} {2}/{2}/{2}\n", 
                    triangles[i]+1, triangles[i+1]+1, triangles[i+2]+1));
            }
        }
        return sb.ToString();
    }
 
    public static void MeshToFile(MeshFilter mf, string filename) {
        using (StreamWriter sw = new StreamWriter(filename)) 
        {
            sw.Write(MeshToString(mf));
        }
    }

         在RecastDemo中加载这个obj文件即可