Unity3D Asset文件导出3DMax 可编辑格式
发表于2017-11-11
一、前言
美术想要一个把unity中*.asset的模型导出来，导成3D Max可以打开的模式，fbx或obj，为此，才有了下面Asset文件导出3DMax 可编辑格式的方法，一起来看看吧。
需要导出的格式：
图1
也就是需要一个工具，个人觉得这个问题，肯定之前Unity的前辈就有解决方法了。于是乎网上一通下载和测试。
二、解包工具集合
网络上找来了各种测试，但是没有一个适合我的，很多都是失败，打不开。
参考宣雨松的博客，找了还是没有结果。
图3
解包工具有很多种类，
disunity github地址: https://github.com/ata4/disunity
还有就是AssetAssetsExport，还有Unity Studio.
别人的博客里面都有比较多的介绍和说明，这里就详细说了。
最后还网上wiki里，找到了一个合适的我自己的解包。 http://wiki.unity3d.com/index.php?title=ObjExporter
三、初步成果
找到了一个网站：http://wiki.unity3d.com/index.php?title=ObjExporter
可以导出部分对象。
如下图：
图0
而原来unity中模型是这个样子的。
图4
导出的只有武器和头盔，没有人物主体body.
四、bug修改
其实也不能算bug，也许人家没有这样的需要呢。
Component[] meshfilter = selection[i].GetComponentsInChildren<MeshFilter>();
MeshFilter[] mf = new MeshFilter[meshfilter.Length];
int m = 0;
for (; m < meshfilter.Length; m++)
｛
exportedObjects++;
mf[m] = (MeshFilter)meshfilter[m];
｝ 代码中是要查找所有组件中的MeshFilter，发现SkinnedMeshRender组件居然没有这个MeshFilter这个组件，所以总会导出少一个，而这个居然是人的主体。
图5
本来说让美术自己添加一个MeshFilter组件，然后根据mesh render中的mesh自己来添加一个对应的mesh.
既然是程序，那就想办法，思路很明显，既然是有meshrender,就从这入手呗。
代码还是不难度。
// 没有meshFilter，添加一个meshFilter.
SkinnedMeshRenderer[] meshfilterRender = selection[i].GetComponentsInChildren<SkinnedMeshRenderer>();
for (int j = 0; j < meshfilterRender.Length; j++)
｛
if (meshfilterRender[j].GetComponent<MeshFilter>() == null)
｛
meshfilterRender[j].gameObject.AddComponent<MeshFilter>();
meshfilterRender[j].GetComponent<MeshFilter>().sharedMesh = Instantiate(meshfilterRender[j].sharedMesh);
｝
｝ 这样修改过，就会自动在没有MeshFilter，但是有skinnedMeshRender组件的节点下，添加一个MeshFilter,然后就可以正常导出成.obj文件，与.FBX是类似的，都可以被3D max编辑使用。
图7
最后的在VS中看的模型，因为没有安装3Dmax.
图6
虽然看起来简陋，但是满足他们小需要，就好了。
贴出主要的代码：
/*
Based on ObjExporter.cs, this "wrapper" lets you export to .OBJ directly from the editor menu.
This should be put in your "Editor"-folder. Use by selecting the objects you want to export, and select
the appropriate menu item from "Custom->Export". Exported models are put in a folder called
"ExportedObj" in the root of your Unity-project. Textures should also be copied and placed in the
same folder.
N.B. there may be a bug so if the custom option doesn't come up refer to this thread http://answers.unity3d.com/questions/317951/how-to-use-editorobjexporter-obj-saving-script-fro.html
Updated for Unity 5.3
2017-03-07
@cartzhang
fixed can not create obj file in folder.
*/
using UnityEngine;
using UnityEditor;
using UnityEditor.SceneManagement;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System;
struct ObjMaterial
｛
public string name;
public string textureName;
｝
public class EditorObjExporter : ScriptableObject
｛
private static int vertexOffset = 0;
private static int normalOffset = 0;
private static int uvOffset = 0;
//User should probably be able to change this. It is currently left as an excercise for
//the reader.
private static string targetFolder = "ExportedObj";
private static string MeshToString(MeshFilter mf, Dictionary<string, ObjMaterial> materialList)
｛
Debug.Assert(null != mf);
Mesh m = mf.sharedMesh;
Material[] mats = mf.GetComponent<Renderer>().sharedMaterials;
StringBuilder sb = new StringBuilder();
if (null == m)
return sb.ToString();
sb.Append("g ").Append(mf.name).Append("\n");
foreach (Vector3 lv in m.vertices)
｛
Vector3 wv = mf.transform.TransformPoint(lv);
//This is sort of ugly - inverting x-component since we're in
//a different coordinate system than "everyone" is "used to".
sb.Append(string.Format("v ｛0｝ ｛1｝ ｛2｝\n", -wv.x, wv.y, wv.z));
｝
sb.Append("\n");
foreach (Vector3 lv in m.normals)
｛
Vector3 wv = mf.transform.TransformDirection(lv);
sb.Append(string.Format("vn ｛0｝ ｛1｝ ｛2｝\n", -wv.x, wv.y, wv.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");
//See if this material is already in the materiallist.
try
｛
ObjMaterial objMaterial = new ObjMaterial();
objMaterial.name = mats[material].name;
if (mats[material].mainTexture)
objMaterial.textureName = AssetDatabase.GetAssetPath(mats[material].mainTexture);
else
objMaterial.textureName = null;
materialList.Add(objMaterial.name, objMaterial);
｝
catch (ArgumentException)
｛
//Already in the dictionary
｝
int[] triangles = m.GetTriangles(material);
for (int i = 0; i < triangles.Length; i += 3)
｛
//Because we inverted the x-component, we also needed to alter the triangle winding.
sb.Append(string.Format("f ｛1｝/｛1｝/｛1｝ ｛0｝/｛0｝/｛0｝ ｛2｝/｛2｝/｛2｝\n",
triangles[i] + 1 + vertexOffset, triangles[i + 1] + 1 + normalOffset, triangles[i + 2] + 1 + uvOffset));
｝
｝
vertexOffset += m.vertices.Length;
normalOffset += m.normals.Length;
uvOffset += m.uv.Length;
return sb.ToString();
｝
private static void Clear()
｛
vertexOffset = 0;
normalOffset = 0;
uvOffset = 0;
｝
private static Dictionary<string, ObjMaterial> PrepareFileWrite()
｛
Clear();
return new Dictionary<string, ObjMaterial>();
｝
private static void MaterialsToFile(Dictionary<string, ObjMaterial> materialList, string folder, string filename)
｛
using (StreamWriter sw = new StreamWriter(folder + Path.DirectorySeparatorChar + filename + ".mtl"))
｛
foreach (KeyValuePair<string, ObjMaterial> kvp in materialList)
｛
sw.Write("\n");
sw.Write("newmtl ｛0｝\n", kvp.Key);
sw.Write("Ka 0.6 0.6 0.6\n");
sw.Write("Kd 0.6 0.6 0.6\n");
sw.Write("Ks 0.9 0.9 0.9\n");
sw.Write("d 1.0\n");
sw.Write("Ns 0.0\n");
sw.Write("illum 2\n");
if (kvp.Value.textureName != null)
｛
string destinationFile = kvp.Value.textureName;
int stripIndex = destinationFile.LastIndexOf(Path.DirectorySeparatorChar);
if (stripIndex >= 0)
destinationFile = destinationFile.Substring(stripIndex + 1).Trim();
string relativeFile = destinationFile;
destinationFile = folder + Path.DirectorySeparatorChar + destinationFile;
Debug.Log("Copying texture from " + kvp.Value.textureName + " to " + destinationFile);
try
｛
//Copy the source file
File.Copy(kvp.Value.textureName, destinationFile);
｝
catch
｛
｝
sw.Write("map_Kd ｛0｝", relativeFile);
｝
sw.Write("\n\n\n");
｝
｝
｝
private static void MeshToFile(MeshFilter mf, string folder, string filename)
｛
Dictionary<string, ObjMaterial> materialList = PrepareFileWrite();
using (StreamWriter sw = new StreamWriter(folder + Path.DirectorySeparatorChar + filename + ".obj"))
｛
sw.Write("mtllib ./" + filename + ".mtl\n");
sw.Write(MeshToString(mf, materialList));
｝
MaterialsToFile(materialList, folder, filename);
｝
private static void MeshesToFile(MeshFilter[] mf, string folder, string filename)
｛
Dictionary<string, ObjMaterial> materialList = PrepareFileWrite();
using (StreamWriter sw = new StreamWriter(folder + Path.DirectorySeparatorChar + filename + ".obj"))
｛
sw.Write("mtllib ./" + filename + ".mtl\n");
for (int i = 0; i < mf.Length; i++)
｛
sw.Write(MeshToString(mf[i], materialList));
｝
｝
MaterialsToFile(materialList, folder, filename);
｝
private static bool CreateTargetFolder()
｛
try
｛
System.IO.Directory.CreateDirectory(targetFolder);
｝
catch
｛
EditorUtility.DisplayDialog("Error!", "Failed to create target folder!", "");
return false;
｝
return true;
｝
[MenuItem("Custom/Export/Export whole selection to single OBJ")]
static void ExportWholeSelectionToSingle()
｛
if (!CreateTargetFolder())
return;
Transform[] selection = Selection.GetTransforms(SelectionMode.Editable | SelectionMode.ExcludePrefab);
if (selection.Length == 0)
｛
EditorUtility.DisplayDialog("No source object selected!", "Please select one or more target objects", "");
return;
｝
int exportedObjects = 0;
ArrayList mfList = new ArrayList();
for (int i = 0; i < selection.Length; i++)
｛
Component[] meshfilter = selection[i].GetComponentsInChildren(typeof(MeshFilter));
for (int m = 0; m < meshfilter.Length; m++)
｛
exportedObjects++;
mfList.Add(meshfilter[m]);
｝
｝
if (exportedObjects > 0)
｛
MeshFilter[] mf = new MeshFilter[mfList.Count];
for (int i = 0; i < mfList.Count; i++)
｛
mf[i] = (MeshFilter)mfList[i];
｝
string filename = EditorSceneManager.GetActiveScene().name + "_" + exportedObjects;
int stripIndex = filename.LastIndexOf(Path.DirectorySeparatorChar);
if (stripIndex >= 0)
filename = filename.Substring(stripIndex + 1).Trim();
MeshesToFile(mf, targetFolder, filename);
EditorUtility.DisplayDialog("Objects exported", "Exported " + exportedObjects + " objects to " + filename, "");
｝
else
EditorUtility.DisplayDialog("Objects not exported", "Make sure at least some of your selected objects have mesh filters!", "");
｝
[MenuItem("Custom/Export/Export each selected to single OBJ")]
static void ExportEachSelectionToSingle()
｛
if (!CreateTargetFolder())
return;
Transform[] selection = Selection.GetTransforms(SelectionMode.Editable | SelectionMode.ExcludePrefab);
if (selection.Length == 0)
｛
EditorUtility.DisplayDialog("No source object selected!", "Please select one or more target objects", "");
return;
｝
int exportedObjects = 0;
for (int i = 0; i < selection.Length; i++)
｛
// 没有meshFilter，添加一个meshFilter.
SkinnedMeshRenderer[] meshfilterRender = selection[i].GetComponentsInChildren<SkinnedMeshRenderer>();
for (int j = 0; j < meshfilterRender.Length; j++)
｛
if (meshfilterRender[j].GetComponent<MeshFilter>() == null)
｛
meshfilterRender[j].gameObject.AddComponent<MeshFilter>();
meshfilterRender[j].GetComponent<MeshFilter>().sharedMesh = Instantiate(meshfilterRender[j].sharedMesh);
｝
｝
Component[] meshfilter = selection[i].GetComponentsInChildren<MeshFilter>();
MeshFilter[] mf = new MeshFilter[meshfilter.Length];
int m = 0;
for (; m < meshfilter.Length; m++)
｛
exportedObjects++;
mf[m] = (MeshFilter)meshfilter[m];
｝
MeshesToFile(mf, targetFolder, selection[i].name + "_" + i);
｝
if (exportedObjects > 0)
｛
EditorUtility.DisplayDialog("Objects exported", "Exported " + exportedObjects + " objects", "");
｝
else
EditorUtility.DisplayDialog("Objects not exported", "Make sure at least some of your selected objects have mesh filters!", "");
｝
可以直接复制到直接的项目中使用。
五、怎么使用呢?
首先把代码拷贝到项目中，直接下载工程也行。
步骤一
图8
步骤二
图10
步骤三
图11
就可以使用你的模型编辑工具来查看了。
六、源码和示例工程
源码地址：https://github.com/cartzhang/unity_lab/blob/master/ExportFbx/UnityAssetExportFBX/Assets/Editor/OBJExport/EditorObjExporter.cs
示例工程地址：https://github.com/cartzhang/unity_lab/tree/master/ExportFbx/UnityAssetExportFBX
博客图片地址：https://github.com/cartzhang/unity_lab/tree/master/ExportFbx/Img
Github readme：https://github.com/cartzhang/unity_lab/blob/master/ExportFbx/Unity%20asset%E6%96%87%E4%BB%B6%20%E5%AF%BC%E5%87%BAOBJ.md