Unity 导出obj模型
2024-04-05 15:34:08
文章目录
- 前言
- 一、部分细节
- 1.镜像
- 2.压缩存储
- 二、测试效果
- 1.编辑器非运行环境
- 2.编辑器运行环境
- 局限性
- 完整代码
前言
obj格式是一种通用的3D模型格式，也是unity支持的模型格式之一。obj具体格式介绍可以去某度看看，有不少。本篇重点是在unity编辑器中运行状态下和非运行状态下将场景中的物体导出为obj。
一、部分细节
1.镜像
也就是坐标手系变换，unity是使用左手坐标系的，而标准obj是右手坐标系，所以unity在导入obj后会自动将obj模型镜像。在导出时笔者也加上了这个功能，不然按默认的导出obj后再放入unity中就会发现两个模型镜像了。其实变换手系原理很简单，如下图所示（图片来源），固定两条轴------把两条轴重叠-------就会发现另外一条轴是相反的，比如把Y轴和Z轴对齐，此时只要把X轴的值取反就可以达到镜像的效果。
//写出顶点
for (int i = 0; i < vertices.Length; i++)
{Vector3 worldPos = trans.TransformPoint(vertices[i]);//顶点镜像if (exchangeCoordinate) worldPos.x *= -1;sw.Write("v " + worldPos.x + " " + worldPos.y + " " + worldPos.z + "\n");
}
sw.Write("\n");//写出法线
if(normals.Length == vertices.Length)
{hasNormal = true;for (int i = 0; i < normals.Length; i++){Vector3 worldNormal = trans.TransformDirection(normals[i]);//法线镜像if (exchangeCoordinate) worldNormal.x *= -1;sw.Write("vn " + worldNormal.x + " " + worldNormal.y + " " + worldNormal.z + "\n");}sw.Write("\n");
}
2.压缩存储
所谓压缩存储，其实就是利用obj三角片面的索引特性将指向相同的内容使用同一个索引，也就是重用。其实unity里面的基本几何体都是没有重用的，如下图，一个正方体应该只有8个点，12个三角面片，但图中显示的却是24个顶点。
将cube直接不压缩导出来后确实有24个，但是可以明显看到有不少点坐标是相同的，特别是uv信息，相同的更多，这种方式有个特点，就是顶点有多少个，法线和uv就有多少个（某些可能没有法线或uv的模型除外），从后面的三角面片信息也可以看出来，顶点/法线/UV 的索引都是相同的。
再看下添加重用后导出的obj数据，明显少了很多数据，此时顶点是真的只有8个了，然后看下三角面片中顶点，法线和uv的索引不尽相同。
不过这时如果把这个压缩后的obj再次导入unity就会发现一个神奇的事，如下图，显示的顶点数又变成24了，具体原因可以看下这篇博客
要实现压缩存储其实不难，就是先遍历一遍，把相同的数据用一个代替就可以了，这里用字典来存储单一的数据
//保存相同的 顶点/法线/UV 对应的唯一索引
Dictionary<Vector3, int> verticesDic = new Dictionary<Vector3, int>();
Dictionary<Vector3, int> normalDic = new Dictionary<Vector3, int>();
Dictionary<Vector2, int> uvDic = new Dictionary<Vector2, int>();
//计算重复的顶点法线uv
for (int i = 0; i < vertices.Length; i++)
{if (!verticesDic.ContainsKey(vertices[i]))verticesDic.Add(vertices[i], verticesDic.Count);}
}
if(normals.Length == vertices.Length)
{hasNormal = true;for (int i = 0; i < normals.Length; i++){if (!normalDic.ContainsKey(normals[i])){normalDic.Add(normals[i], normalDic.Count);}}
}if(uvs.Length == vertices.Length )
{hasUV = true;for (int i = 0; i < uvs.Length; i++){if (!uvDic.ContainsKey(uvs[i])){uvDic.Add(uvs[i], uvDic.Count);}}
}
写出数据部分有点长，可以看下下面的完整代码部分。
二、测试效果
测试模型来源于AssetStore中的unity-chan!
1.编辑器非运行环境
测试脚本
/****************************************************文件：ExportObjExample.cs作者：TKB邮箱: 544726237@qq.com日期：2021/7/24 23:42:59功能：Nothing
*****************************************************/
using UnityEngine;
using System.IO;namespace TLib
{public class ExportObjExample{#if UNITY_EDITOR//将选中的模型及其子物体导出到一个obj中[UnityEditor.MenuItem("Tools/导出obj",false)]private static void OnClickExportObj(){GameObject go = UnityEditor.Selection.activeObject as GameObject;Exporter.ExportObj(go, Application.dataPath + "/Export/"+ go.name+".obj",true,true);UnityEditor.AssetDatabase.Refresh();}//将选中的物体及其子对象分别导出为obj[UnityEditor.MenuItem("Tools/导出objs", false)]private static void OnClickExportObj1(){GameObject go = UnityEditor.Selection.activeObject as GameObject;Exporter.ExportObjs(go, Application.dataPath + "/Export");UnityEditor.AssetDatabase.Refresh();}
#endif}
}
既可以导出MeshRendererer（右边方块组成的）也可以导出SkinnedMeshRenderer（左边）。眼尖的同学可能看到了导出来的chan脸上的腮红有点问题，显示效果也有差距，这其实是因为chan使用的shader是自定义的，不是标准材质。
2.编辑器运行环境
测试代码
using UnityEngine;
using TLib;public class RunTimeExport : MonoBehaviour
{public GameObject go;// Update is called once per framevoid Update(){if (Input.GetKeyUp(KeyCode.A)){if (go != null){Exporter.ExportObj(go, Application.dataPath + "/Export/" + go.name + ".obj");}}}
}
注意，运行时如果是带动画的需要先把动画脚本禁用掉，不然一些节点位置可能会发生错乱
禁用动画：
导出的效果截图：
不禁用动画时，可以看到脸部节点已经错乱了：
局限性
- 只支持unity标准材质，或者漫反射颜色与贴图属性名跟标准材质相同的自定义材质
- 材质只有漫反射颜色、透明度和漫反射贴图导出
- 上面提到的带动画导出时节点位置可能会错乱
- 导出的模型名请别用中文，目前导出的mtl文件的名字将会与模型名保持一致，如果mtl文件名含有中文，不少3D软件无法识别材质信息，包括unity，可以看下笔者的另一篇博客
完整代码
/****************************************************文件：Exporter.cs作者：TKB邮箱: 544726237@qq.com日期：2021/7/24 23:9:12功能：导出obj（如果有贴图，仅在编辑器模式下才支持）
*****************************************************/using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using UnityEngine;namespace TLib
{public class Exporter{//保存同名次数static Dictionary<string, int> meshNameCountDic = new Dictionary<string, int>();#region 导出obj/// <summary>/// 导出GameObject及其子对象为一个obj/// </summary>/// <param name="go">要导出的GameObject</param>/// <param name="outputPath">导出的obj完整路径，如 Application.dataPath+"/temp.obj"</param>/// <param name="exchangeCoordinate">是否要变换坐标系，从左手坐标系（unity）变换到右手坐标系（标准obj），默认为true</param>/// <param name="compress">是否要压缩存储，默认为true</param>public static void ExportObj(GameObject go, string outputPath, bool exchangeCoordinate = true,bool compress = true){if (!go) return;meshNameCountDic.Clear();if (!Directory.Exists(Path.GetDirectoryName(outputPath))){Directory.CreateDirectory(Path.GetDirectoryName(outputPath));}if (File.Exists(outputPath)){try{File.Delete(outputPath);Debug.LogWarning("该路径已存在同名文件，已删除！" + outputPath);}catch (Exception e){Debug.LogError(e + "该路径已存在同名文件并且删除失败！" + outputPath);return;}}MeshFilter[] meshFilters = go.GetComponentsInChildren<MeshFilter>();SkinnedMeshRenderer[] skinnedMeshRenderers = go.GetComponentsInChildren<SkinnedMeshRenderer>();int meshCount = meshFilters.Length + skinnedMeshRenderers.Length;List<string> exportedMatList = new List<string>();//保存已经导出的材质名字 FileStream meshFS=null;StreamWriter meshSW=null;try{meshFS = new FileStream(outputPath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite);meshSW = new StreamWriter(meshFS, Encoding.UTF8);string matPath = Path.Combine(Path.GetDirectoryName(outputPath), Path.GetFileNameWithoutExtension(outputPath) + ".mtl");StringBuilder sb = new StringBuilder();int currentIndex = 0;int currentNormalIndex = 0;int currentUVIndex = 0;meshSW.Write("#Export by TLib from Unity3D\n");meshSW.Write("#Time : "+DateTime.Now+"\n");meshSW.Write("\nmtllib " + Path.GetFileNameWithoutExtension(outputPath) + ".mtl\n\n");for (int i = 0; i < meshFilters.Length; i++){Mesh mesh;Material[] mats;
#if UNITY_EDITORmesh = meshFilters[i].sharedMesh;mats = meshFilters[i].gameObject.GetComponent<MeshRenderer>().sharedMaterials;
#elsemesh = meshFilters[i].mesh;mats = meshFilters[i].gameObject.GetComponent<MeshRenderer>().materials;
#endiffor (int j = 0; j < mats.Length; j++){//某些材质没有设置或者丢失if (mats[j] == null){Material mat = new Material(Shader.Find("Standard"));mat.name = mesh.name + "_" + i + "_" + j;mats[j] = mat;}if (exportedMatList.Contains(mats[j].name)) continue;ExportMaterialToObj(mats[j], sb, Path.GetDirectoryName(outputPath));exportedMatList.Add(mats[j].name);}
#if UNITY_EDITORUnityEditor.EditorUtility.DisplayProgressBar("导出Obj", mesh.name + ":" + i + "/" + meshCount, i * 1.0f / meshCount);
#endifExportMeshToObj(meshFilters[i].transform, mesh, meshSW, mats, ref currentIndex, ref currentNormalIndex, ref currentUVIndex, exchangeCoordinate,compress);}for (int i = 0; i < skinnedMeshRenderers.Length; i++){Mesh mesh;Material[] mats;
#if UNITY_EDITORmesh = skinnedMeshRenderers[i].sharedMesh;mats = skinnedMeshRenderers[i].sharedMaterials;
#elsemesh = meshFilters[i].mesh;mats = meshFilters[i].materials;
#endiffor (int j = 0; j < mats.Length; j++){//某些材质没有设置或者丢失if (mats[j] == null){Material mat = new Material(Shader.Find("Standard"));mat.name = mesh.name + "_" + i + "_" + j;mats[j] = mat;}if (exportedMatList.Contains(mats[j].name)) continue;ExportMaterialToObj(mats[j], sb, Path.GetDirectoryName(outputPath));exportedMatList.Add(mats[j].name);}
#if UNITY_EDITORUnityEditor.EditorUtility.DisplayProgressBar("导出Obj", mesh.name + ":" + (i+meshFilters.Length) + "/" + meshCount, i * 1.0f / meshCount);
#endifExportMeshToObj(skinnedMeshRenderers[i].transform, mesh, meshSW, mats, ref currentIndex, ref currentNormalIndex, ref currentUVIndex, exchangeCoordinate,compress);}meshSW.Close();meshFS.Close();File.WriteAllText(matPath, sb.ToString());}catch (Exception e){Debug.LogError(e);if (meshSW!=null) meshSW.Close();if (meshFS != null) meshFS.Close();}finally{exportedMatList.Clear();UnityEditor.EditorUtility.ClearProgressBar();}}/// <summary>/// 导出Transform及其子对象为一个obj/// </summary>/// <param name="trans">待导出的Transform</param>/// <param name="outputPath">导出的obj完整路径，如 Application.dataPath+"/temp.obj"</param>/// <param name="exchangeCoordinate">是否要变换坐标系，从左手坐标系（unity）变换到右手坐标系（标准obj），默认为true</param>/// <param name="compress">是否要压缩存储，默认为true</param>public static void ExportObj(Transform trans, string outputPath, bool exchangeCoordinate = true,bool compress = true){ExportObj(trans.gameObject, outputPath, exchangeCoordinate,compress);}/// <summary>/// 导出GameObject及其子对象为多个obj，每个mesh对应一个obj/// </summary>/// <param name="go">要导出的GameObject</param>/// <param name="outputDir">将obj导出到哪个文件夹</param>/// <param name="exchangeCoordinate">是否要变换坐标系，从左手坐标系（unity）变换到右手坐标系（标准obj），默认为true</param>/// <param name="compress">是否要压缩存储，默认为true</param>public static void ExportObjs(GameObject go, string outputDir, bool exchangeCoordinate = true, bool compress = true){if (!Directory.Exists(outputDir)) Directory.CreateDirectory(outputDir);MeshFilter[] meshFilters = go.GetComponentsInChildren<MeshFilter>();SkinnedMeshRenderer[] skinnedMeshRenderers = go.GetComponentsInChildren<SkinnedMeshRenderer>();int meshCount = meshFilters.Length + skinnedMeshRenderers.Length;Dictionary<string, int> meshNameDic = new Dictionary<string, int>();int currentIndex = 0;int currentNormalIndex = 0;int currentUVIndex = 0;for (int i = 0; i < meshFilters.Length; i++){try{string name = meshFilters[i].gameObject.name;if (meshNameDic.ContainsKey(name)){meshNameDic[name]++;name += meshNameDic[name];}else meshNameDic.Add(name, 0);string objPath = Path.Combine(outputDir, name + ".obj");FileStream meshFS = new FileStream(objPath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite);StreamWriter meshSW = new StreamWriter(meshFS, Encoding.UTF8);string matPath = Path.Combine(outputDir, name + ".mtl");StringBuilder sb = new StringBuilder();meshNameCountDic.Clear();meshSW.Write("# Export by TLib\n# " + DateTime.Now.ToString("yyyy-MM-dd hh-mm-ss") + "\n");meshSW.Write("\nmtllib " + name + ".mtl\n\n");Mesh mesh;Material[] mats;
#if UNITY_EDITORmesh = meshFilters[i].sharedMesh;mats = meshFilters[i].gameObject.GetComponent<MeshRenderer>().sharedMaterials;
#elsemesh = meshFilters[i].mesh;mats = meshFilters[i].gameObject.GetComponent<MeshRenderer>().materials;
#endifList<string> exportedMatList = new List<string>();//保存已经导出的材质名字 for (int j = 0; j < mats.Length; j++){//某些材质没有设置或者丢失if (mats[j] == null){Material mat = new Material(Shader.Find("Standard"));mat.name = mesh.name + "_" + i + "_" + j;mats[j] = mat;}if (exportedMatList.Contains(mats[j].name)) continue;ExportMaterialToObj(mats[j], sb, Path.GetDirectoryName(objPath));exportedMatList.Add(mats[j].name);}
#if UNITY_EDITORUnityEditor.EditorUtility.DisplayProgressBar("导出Obj", mesh.name + ":" + i + "/" + meshCount, i * 1.0f / meshCount);
#endif//分别导出obj时，每导出一个obj都要重置这些索引变量currentIndex = 0;currentNormalIndex = 0;currentUVIndex = 0;ExportMeshToObj(meshFilters[i].transform, mesh, meshSW, mats, ref currentIndex, ref currentNormalIndex, ref currentUVIndex, exchangeCoordinate,compress);File.WriteAllText(matPath, sb.ToString());meshSW.Close();meshFS.Close();}catch (Exception e){Debug.Log(e);}}for (int i = 0; i < skinnedMeshRenderers.Length; i++){try{string name = skinnedMeshRenderers[i].gameObject.name;if (meshNameDic.ContainsKey(name)){name += meshNameDic[name];meshNameDic[name]++;}else meshNameDic.Add(name, 1);string objPath = Path.Combine(outputDir, name + ".obj");FileStream meshFS = new FileStream(objPath, FileMode.Create, FileAccess.Write, FileShare.ReadWrite);StreamWriter meshSW = new StreamWriter(meshFS, Encoding.UTF8);string matPath = Path.Combine(outputDir, name + ".mtl");StringBuilder sb = new StringBuilder();meshNameCountDic.Clear();meshSW.Write("# Export by TLib\n# " + DateTime.Now.ToString("yyyy-MM-dd hh-mm-ss") + "\n");meshSW.Write("\nmtllib " + name + ".mtl\n\n");Mesh mesh;Material[] mats;
#if UNITY_EDITORmesh = skinnedMeshRenderers[i].sharedMesh;mats = skinnedMeshRenderers[i].sharedMaterials;
#elsemesh = meshFilters[i].mesh;mats = meshFilters[i].
materials;
#endifList<string> exportedMatList = new List<string>();//保存已经导出的材质名字 for (int j = 0; j < mats.Length; j++){//某些材质没有设置或者丢失if (mats[j] == null){Material mat = new Material(Shader.Find("Standard"));mat.name = mesh.name + "_" + i + "_" + j;mats[j] = mat;}if (exportedMatList.Contains(mats[j].name)) continue;ExportMaterialToObj(mats[j], sb, Path.GetDirectoryName(objPath));exportedMatList.Add(mats[j].name);}
#if UNITY_EDITORUnityEditor.EditorUtility.DisplayProgressBar("导出Obj", mesh.name + ":" + (i + meshFilters.Length) + "/" + meshCount, i * 1.0f / meshCount);
#endif//分别导出obj时，每导出一个obj都要重置这些索引变量currentIndex = 0;currentNormalIndex = 0;currentUVIndex = 0;ExportMeshToObj(skinnedMeshRenderers[i].transform, mesh, meshSW, mats, ref currentIndex, ref currentNormalIndex, ref currentUVIndex, exchangeCoordinate,compress);File.WriteAllText(matPath, sb.ToString());meshSW.Close();meshFS.Close();}catch (Exception e){Debug.Log(e);}}UnityEditor.EditorUtility.ClearProgressBar();}/// <summary>/// 导出Transform及其子对象为多个obj，每个mesh对应一个obj/// </summary>/// <param name="trans">待导出的Transform</param>/// <param name="outputDir">将obj导出到哪个文件夹</param>/// <param name="exchangeCoordinate">是否要变换坐标系，从左手坐标系（unity）变换到右手坐标系（标准obj），默认为true</param>/// <param name="compress">是否要压缩存储，默认为true</param>public static void ExportObjs(Transform trans, string outputDir, bool exchangeCoordinate = true,bool compress = true){ExportObjs(trans.gameObject, outputDir, exchangeCoordinate,compress);}/// <summary>/// 将mesh数据导出obj，用指定的StreamWrite写出/// </summary>/// <param name="trans">mesh对应的Transform，用于将顶点转换到世界空间</param>/// <param name="mesh">待导出的mesh</param>/// <param name="sw">输出流，使用这个输出流导出obj</param>/// <param name="materialName">这个mesh对应的材质名</param>/// <param name="currentIndex">到这个mesh为止前面导出了多少个顶点，用于索引偏移</param>/// <param name="exchangeCoordinate">是否要变换坐标系，从左手坐标系（unity）变换到右手坐标系（标准obj）</param>private static void ExportMeshToObj(Transform trans, Mesh mesh, StreamWriter sw, Material[] materials, ref int currentIndex, ref int currentNormalIndex, ref int currentUVIndex, bool exchangeCoordinate,bool compress){Vector3[] vertices = mesh.vertices;Vector3[] normals = mesh.normals;Vector2[] uvs = mesh.uv;bool hasNormal = false;bool hasUV = false;//mesh名字处理string name = mesh.name;if (meshNameCountDic.ContainsKey(name)){string tempName = name;name = name + "_" + meshNameCountDic[tempName];meshNameCountDic[tempName]++;}else{meshNameCountDic.Add(name, 1);}if (compress){//保存相同的 顶点/法线/UV 对应的唯一索引Dictionary<Vector3, int> verticesDic = new Dictionary<Vector3, int>();Dictionary<Vector3, int> normalDic = new Dictionary<Vector3, int>();Dictionary<Vector2, int> uvDic = new Dictionary<Vector2, int>();//计算重复的顶点法线uvfor (int i = 0; i < vertices.Length; i++){if (!verticesDic.ContainsKey(vertices[i])){verticesDic.Add(vertices[i], verticesDic.Count);}}if(normals.Length == vertices.Length){hasNormal = true;for (int i = 0; i < normals.Length; i++){if (!normalDic.ContainsKey(normals[i])){normalDic.Add(normals[i], normalDic.Count);}}}if(uvs.Length == vertices.Length ){hasUV = true;for (int i = 0; i < uvs.Length; i++){if (!uvDic.ContainsKey(uvs[i])){uvDic.Add(uvs[i], uvDic.Count);}}}//将不重复的顶点法线uv写出到objforeach (Vector3 item in verticesDic.Keys){//变换到世界空间Vector3 worldPos = trans.TransformPoint(item);//如果需要变换手系if (exchangeCoordinate) worldPos.x *= -1;//写出sw.Write("v " + worldPos.x + " " + worldPos.y + " " + worldPos.z + "\n");}sw.Write("\n");if(hasNormal){foreach (Vector3 item in normalDic.Keys){//变换到世界空间Vector3 worldNormal = trans.TransformDirection(item);//如果需要变换手系if (exchangeCoordinate) worldNormal.x *= -1;//写出sw.Write("vn " + worldNormal.x + " " + worldNormal.y + " " + worldNormal.z + "\n");}sw.Write("\n");}if (hasUV){foreach (Vector2 item in uvDic.Keys){sw.Write("vt " + item.x + " " + item.y + " 0.0\n");}sw.Write("\n");}for (int k = 0; k < mesh.subMeshCount; k++){if (mesh.subMeshCount == 1){sw.Write("\ng " + name + "\n");}else{sw.Write("\ng " + name + "_" + k + "\n");}sw.Write("usemtl " + materials[k].name + "\n");int[] tris = mesh.GetIndices(k);for (int i = 0; i < tris.Length / 3; i++){int verticesIndex1 = 0, verticesIndex2 = 0, verticesIndex3 = 0, normalIndex1 = 0, normalIndex2 = 0, normalIndex3 = 0, uvIndex1 = 0, uvIndex2 = 0, uvIndex3 = 0;try{Vector3 curPos1 = vertices[tris[i * 3]];Vector3 curPos2 = vertices[tris[i * 3 + 1]];Vector3 curPos3 = vertices[tris[i * 3 + 2]];verticesIndex1 = verticesDic[curPos1];verticesIndex2 = verticesDic[curPos2];verticesIndex3 = verticesDic[curPos3];}catch(Exception e){Debug.Log("缺少顶点重用信息,索引为：" + tris[i * 3] + "\n" + e);}if (hasNormal){try{Vector3 curNormal1 = normals[tris[i * 3]];Vector3 curNormal2 = normals[tris[i * 3 + 1]];Vector3 curNormal3 = normals[tris[i * 3 + 2]];normalIndex1 = normalDic[curNormal1];normalIndex2 = normalDic[curNormal2];normalIndex3 = normalDic[curNormal3];}catch (Exception e){Debug.Log("缺少法线重用信息,索引为：" + tris[i * 3] + "\n" + e);}}if (hasUV){try{Vector2 curUv1 = uvs[tris[i * 3]];Vector2 curUv2 = uvs[tris[i * 3 + 1]];Vector2 curUv3 = uvs[tris[i * 3 + 2]];uvIndex1 = uvDic[curUv1];uvIndex2 = uvDic[curUv2];uvIndex3 = uvDic[curUv3];}catch(Exception e){Debug.Log("缺少UV重用信息,索引为：" + tris[i * 3] + "\n" + e);}}if (exchangeCoordinate){//既有法线也有uvif (hasNormal && hasUV){sw.Write("f " + (verticesIndex2 + 1 + currentIndex) + "/" + (uvIndex2 + 1 + currentUVIndex) + "/" + (normalIndex2 + 1 + currentNormalIndex));sw.Write(" " + (verticesIndex1 + 1 + currentIndex) + "/" + (uvIndex1 + 1 + currentUVIndex) + "/" + (normalIndex1 + 1 + currentNormalIndex));sw.Write(" " + (verticesIndex3 + 1 + currentIndex) + "/" + (uvIndex3 + 1 + currentUVIndex) + "/" + (normalIndex3 + 1 + currentNormalIndex) + "\n");}//有uv没法线else if(!hasNormal && hasUV){sw.Write("f " + (verticesIndex2 + 1 + currentIndex) + "/" + (uvIndex2 + 1 + currentUVIndex));sw.Write(" " + (verticesIndex1 + 1 + currentIndex) + "/" + (uvIndex1 + 1 + currentUVIndex));sw.Write(" " + (verticesIndex3 + 1 + currentIndex) + "/" + (uvIndex3 + 1 + currentUVIndex) + "\n");}//有法线没uvelse if(hasNormal && !hasUV){sw.Write("f " + (verticesIndex2 + 1 + currentIndex) + "//" + (normalIndex2 + 1 + currentNormalIndex));sw.Write(" " + (verticesIndex1 + 1 + currentIndex) + "//" + (normalIndex1 + 1 + currentNormalIndex));sw.Write(" " + (verticesIndex3 + 1 + currentIndex) + "//" + (normalIndex3 + 1 + currentNormalIndex) + "\n");}//既没法线也没uvelse if(!hasNormal && !hasUV){sw.Write("f " + (verticesIndex2 + 1 + currentIndex));sw.Write(" " + (verticesIndex1 + 1 + currentIndex));sw.Write(" " + (verticesIndex3 + 1 + currentIndex) + "\n");}}else{//既有法线也有uvif (hasNormal && hasUV){sw.Write("f " + (verticesIndex1 + 1 + currentIndex) + "/" + (uvIndex1 + 1 + currentUVIndex) + "/" + (normalIndex1 + 1 + currentNormalIndex));sw.Write(" " + (verticesIndex2 + 1 + currentIndex) + "/" + (uvIndex2 + 1 + currentUVIndex) + "/" + (normalIndex2 + 1 + currentNormalIndex));sw.Write(" " + (verticesIndex3 + 1 + currentIndex) + "/" + (uvIndex3 + 1 + currentUVIndex) + "/" + (normalIndex3 + 1 + currentNormalIndex) + "\n");}//有uv没法线else if (!hasNormal && hasUV){sw.Write("f " + (verticesIndex1 + 1 + currentIndex) + "/" + (uvIndex1 + 1 + currentUVIndex));sw.Write(" " + (verticesIndex2 + 1 + currentIndex) + "/" + (uvIndex2 + 1 + currentUVIndex));sw.Write(" " + (verticesIndex3 + 1 + currentIndex) + "/" + (uvIndex3 + 1 + currentUVIndex) + "\n");}//有法线没uvelse if (hasNormal && !hasUV){sw.Write("f " + (verticesIndex1 + 1 + currentIndex) + "//" + (normalIndex1 + 1 + currentNormalIndex));sw.Write(" " + (verticesIndex2 + 1 + currentIndex) + "//" + (normalIndex2 + 1 + currentNormalIndex));sw.Write(" " + (verticesIndex3 + 1 + currentIndex) + "//" + (normalIndex3 + 1 + currentNormalIndex) + "\n");}//既没法线也没uvelse if (!hasNormal && !hasUV){sw.Write("f " + (verticesIndex1 + 1 + currentIndex));sw.Write(" " + (verticesIndex2 + 1 + currentIndex));sw.Write(" " + (verticesIndex3 + 1 + currentIndex) + "\n");}}}}sw.Write("\n");currentIndex += verticesDic.Count;currentNormalIndex += normalDic.Count;currentUVIndex += uvDic.Count;verticesDic.Clear();normalDic.Clear();uvDic.Clear();}else{for (int i = 0; i < vertices.Length; i++){Vector3 worldPos = trans.TransformPoint(vertices[i]);//顶点镜像if (exchangeCoordinate) worldPos.x *= -1;sw.Write("v " + worldPos.x + " " + worldPos.y + " " + worldPos.z + "\n");}sw.Write("\n");if(normals.Length == vertices.Length){hasNormal = true;for (int i = 0; i < normals.Length; i++){Vector3 worldNormal = trans.TransformDirection(normals[i]);//法线镜像if (exchangeCoordinate) worldNormal.x *= -1;sw.Write("vn " + worldNormal.x + " " + worldNormal.y + " " + worldNormal.z + "\n");}sw.Write("\n");}if(uvs.Length == vertices.Length){hasUV = true;for (int i = 0; i < uvs.Length; i++){sw.Write("vt " + uvs[i].x + " " + uvs[i].y + "\n");}sw.Write("\n");}for (int k = 0; k < mesh.subMeshCount; k++){if (mesh.subMeshCount == 1){sw.Write("\ng " + mesh.name + "\n");}else{sw.Write("\ng " + mesh.name + "_" + k + "\n");}sw.Write("usemtl " + materials[k].name + "\n");int[] tris = mesh.GetIndices(k);for (int i = 0; i < tris.Length / 3; i++){if (exchangeCoordinate){if(hasNormal && hasUV){sw.Write("f " + (tris[i * 3 + 1] + 1 + currentIndex) + "/" + (tris[i * 3 + 1] + 1 + currentUVIndex) + "/" + (tris[i * 3 + 1] + 1 + currentNormalIndex));sw.Write(" " + (tris[i * 3] + 1 + currentIndex) + "/" + (tris[i * 3] + 1 + currentUVIndex) + "/" + (tris[i * 3] + 1 + currentNormalIndex));sw.Write(" " + (tris[i * 3 + 2] + 1 + currentIndex) + "/" + (tris[i * 3 + 2] + 1 + currentUVIndex) + "/" + (tris[i * 3 + 2] + 1 + currentNormalIndex) + "\n");}else if(!hasNormal && hasUV){sw.Write("f " + (tris[i * 3 + 1] + 1 + currentIndex) + "/" + (tris[i * 3 + 1] + 1 + currentUVIndex));sw.Write(" " + (tris[i * 3] + 1 + currentIndex) + "/" + (tris[i * 3] + 1 + currentUVIndex));sw.Write(" " + (tris[i * 3 + 2] + 1 + currentIndex) + "/" + (tris[i * 3 + 2] + 1 + currentUVIndex) + "\n");}else if(hasNormal && !hasUV){sw.Write("f " + (tris[i * 3 + 1] + 1 + currentIndex) + "//" + (tris[i * 3 + 1] + 1 + currentNormalIndex));sw.Write(" " + (tris[i * 3] + 1 + currentIndex) + "//" + (tris[i * 3] + 1 + currentNormalIndex));sw.Write(" " + (tris[i * 3 + 2] + 1 + currentIndex) + "//" + (tris[i * 3 + 2] + 1 + currentNormalIndex) + "\n");}else if(!hasNormal && !hasUV){sw.Write("f " + (tris[i * 3 + 1] + 1 + currentIndex));sw.Write(" " + (tris[i * 3] + 1 + currentIndex));sw.Write(" " + (tris[i * 3 + 2] + 1 + currentIndex) + "\n");}}else{if (hasNormal && hasUV){sw.Write("f " + (tris[i * 3] + 1 + currentIndex) + "/" + (tris[i * 3] + 1 + currentUVIndex) + "/" + (tris[i * 3] + 1 + currentNormalIndex));sw.Write(" " + (tris[i * 3 + 1] + 1 + currentIndex) + "/" + (tris[i * 3 + 1] + 1 + currentUVIndex) + "/" + (tris[i * 3 + 1] + 1 + currentNormalIndex));sw.Write(" " + (tris[i * 3 + 2] + 1 + currentIndex) + "/" + (tris[i * 3 + 2] + 1 + currentUVIndex) + "/" + (tris[i * 3 + 2] + 1 + currentNormalIndex) + "\n");}else if (!hasNormal && hasUV){sw.Write("f " + (tris[i * 3] + 1 + currentIndex) + "/" + (tris[i * 3] + 1 + currentUVIndex));sw.Write(" " + (tris[i * 3 + 1] + 1 + currentIndex) + "/" + (tris[i * 3 + 1] + 1 + currentUVIndex));sw.Write(" " + (tris[i * 3 + 2] + 1 + currentIndex) + "/" + (tris[i * 3 + 2] + 1 + currentUVIndex) + "\n");}else if (hasNormal && !hasUV){sw.Write("f " + (tris[i * 3] + 1 + currentIndex) + "//" + (tris[i * 3] + 1 + currentNormalIndex));sw.Write(" " + (tris[i * 3 + 1] + 1 + currentIndex) + "//" + (tris[i * 3 + 1] + 1 + currentNormalIndex));sw.Write(" " + (tris[i * 3 + 2] + 1 + currentIndex) + "//" + (tris[i * 3 + 2] + 1 + currentNormalIndex) + "\n");}else if (!hasNormal && !hasUV){sw.Write("f " + (tris[i * 3] + 1 + currentIndex));sw.Write(" " + (tris[i * 3 + 1] + 1 + currentIndex));sw.Write(" " + (tris[i * 3 + 2] + 1 + currentIndex) + "\n");}}}}currentIndex += vertices.Length;currentNormalIndex += normals.Length;currentUVIndex += uvs.Length;}}/// <summary>/// 写出材质信息，贴图仅在编辑器模式可用/// </summary>/// <param name="mat">要写出的材质</param>/// <param name="sb">StringBuilder,用于写出材质</param>/// <param name="outputDir">如果有贴图，需要将贴图复制到obj的生成路径上</param>private static void ExportMaterialToObj(Material mat, StringBuilder sb, string outputDir){sb.Append("\nnewmtl " + mat.name + "\n");//漫反射颜色sb.Append("Kd " + mat.color.r + " " + mat.color.g + " " + mat.color.b + "\n");sb.Append("d " + mat.color.a + "\n"); //透明度if (mat.mainTexture){#if UNITY_EDITORstring path = UnityEditor.AssetDatabase.GetAssetPath(mat.mainTexture);sb.Append("map_Kd " + Path.GetFileName(path) + "\n");File.Copy(path, Path.Combine(outputDir, Path.GetFileName(path)), true);
#endif}}#endregion}
}
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