unity5.4版本打包AssetBundle与加载（避免材质丢失网格丢失）

        unity5.4版本打包AssetBundle与加载（避免材质丢失网格丢失） 

        打包AssetBundle 有各种依赖关系要处理，针对不同的项目具体的打包策略也不同，这里假定是单个不重用的资源打包 完全没有任何依赖，做一个最基础的AssetBundle打包和加载的记录。

打包的代码

usingUnityEngine;

usingUnityEditor;

usingSystem.IO;

publicclassAutoCreateAssetBundle:Editor

{

   publicstaticstringsourcePath =Application.dataPath +"/Resources";

   conststringAssetBundlesOutPutPath ="Assets/StreamingAssets";

    [MenuItem("Tools/Build")]

   publicstaticvoidCreateAssetBundle()

    {

       stringoutputPath =Path.Combine(AssetBundlesOutPutPath,Platform.GetPlatformFloder(EditorUserBuildSettings.activeBuildTarget));

       if(!Directory.Exists(outputPath))

        {

           Directory.CreateDirectory(outputPath);

        }

       BuildPipeline.BuildAssetBundles(outputPath,BuildAssetBundleOptions.None,EditorUserBuildSettings.activeBuildTarget);

       AssetDatabase.Refresh();

    }

    [MenuItem("Tools/Clear")]

   publicstaticvoidClearAllAssetBundleNames()

    {

        ClearAssetBundleName();

    }

   staticvoidClearAssetBundleName()

    {

       intlength =AssetDatabase.GetAllAssetBundleNames().Length;

       Debug.Log("old length" + length);

       string[] oldAssetBundleNames =newstring[length];

       for(inti = 0; i < length; i++)

        {

            oldAssetBundleNames[i] =AssetDatabase.GetAllAssetBundleNames()[i];

        }

       for(intj = 0; j < oldAssetBundleNames.Length; j++)

        {

           AssetDatabase.RemoveAssetBundleName(oldAssetBundleNames[j],true);

        }

        length =AssetDatabase.GetAllAssetBundleNames().Length;

       Debug.Log("clear length" + length);

    }

}

publicclassPlatform

{

   publicstaticstringGetPlatformFloder(BuildTargettarget)

    {

       switch(target)

        {

           caseBuildTarget.Android:

               return"Android";

           caseBuildTarget.iOS:

               return"IOS";

           caseBuildTarget.StandaloneWindows:

           caseBuildTarget.StandaloneWindows64:

               return"Windows";

           caseBuildTarget.StandaloneOSXIntel:

           caseBuildTarget.StandaloneOSXIntel64:

           caseBuildTarget.StandaloneOSXUniversal:

               return"MAC";

           default:

               returnnull;

        }

    }

}

        测试项目里有模型prefab，设定AssetBundle名字 prefab-bundle，打包成Assetbundle文件到 根据目标平台创建出来的合理保存路径中如Windows、Android、IOS等，得到四个文件其中有.magnifest后缀的文件 是说明文件，剩下的两个没有后缀文件 prefab-bundle 和  Windows才是加载的时候需要用到的文件。点开带.magnifest后缀的文件会发现 在依赖关系那里是空的，因为这里只设置了一个prefab的AssetBundle的名字 所以打包了一个单独的prefab，没有任何依赖关系。尽管如此 在加载具体的prefab之前还是需要先加载总文件夹的AssetBundleManifest文件才行。例如此处打包的是Windows平台的资源，保存路径设置的就是Windows 所以 总依赖文件就是Windows文件。

   //load AssetBundleManirest first

   publicvoidMyLoad(stringManifestName,stringtargetModelName,stringtargetModelBundleName,CallBackcallBack)

    {

       //加载AssetBundleManifest文件   

       AssetBundleassetBundleManifest =AssetBundle.LoadFromFile(GetLocalLoadURL(ManifestName));

       if(assetBundleManifest !=null)

        {

           AssetBundleManifestmanifest = (AssetBundleManifest)assetBundleManifest.LoadAsset("AssetBundleManifest");

           //先加载依赖文件 

           string[] depends = manifest.GetAllDependencies(targetModelName);

           AssetBundle[] dependsAssetbundle =newAssetBundle[depends.Length];

           for(intindex = 0; index < depends.Length; index++)

            {

                dependsAssetbundle[index] =AssetBundle.LoadFromFile(GetLocalLoadURL( depends[index]));

            }

           AssetBundlebundle =AssetBundle.LoadFromFile(GetLocalLoadURL(targetModelBundleName));

           GameObjectobj = bundle.LoadAsset("jinjiu01")asGameObject;

           if(obj !=null)

            {

                obj = Instantiate(obj);

                obj.transform.localScale =newVector3(5,5,5);

                obj.AddComponent<RotaController>();

                callBack(obj);

            }

           //释放各种Assetbundle

            assetBundleManifest.Unload(false);

            bundle.Unload(false);

           if(dependsAssetbundle.Length > 0)

            {

               for(inti = 0; i < dependsAssetbundle.Length; i++)

                {

                    dependsAssetbundle[i].Unload(false);

                }

            }

        }

    }

这就是最最基础的打包和加载了。在unity4版本以前 如果没有依赖文件是可以直接加载对应的ab包的，在unity5版本后面需要先加载总AssetBundleManifest文件否则会出现丢失材质球 丢失网格模型等 各种丢失。