一、創(chuàng)建Assetbundle
在unity3d開發(fā)的游戲中，無論模型，音頻，還是圖片等，我們都做成Prefab，然后打包成Assetbundle，方便我們后面的使用，來達到資源的更新。
? ? ? ?一個Assetbundle可以打包一個模型（這里的模型不單單指的是預制模型，可以是Project視圖下的任何東西），也可以是多個模型，但兩種打包方式占用的空間不一樣。
? ? ? 比如我打包三個一樣的模型（只不過他們的腳本不一樣創(chuàng)建三個空的GameObject(One,Two,Three)，分別掛載腳本One,Two,Three）。如果我為每個模型單獨打包生成One,Two,Three三個Assetbundle，其所占的空間是A，B，C，但是A+B+C != D.由此可知想通的資源盡可能的打包到一起，他們共用一套資源。不相同的模型盡量分開打包。
二、分開打包（注意這個腳本必須放在Editor文件夾內(nèi)，Editor文件夾沒有的話需自己創(chuàng)建）
[csharp]?view plaincopy print?
?? ?? ?? [MenuItem("AssetBundleDemo/Create?AssetBundles?By?themselves")]?? static?void?CreateAssetBundleThemelves(){?? ?????? ????Object[]?selects?=?Selection.GetFiltered?(typeof(Object),SelectionMode.DeepAssets);?? ?????? ????foreach(Object?obj?in?selects){?? ?????????? ?????????? ?????????? ????????string?targetPath?=?Application.dataPath?+?"/AssetBundleLearn/StreamingAssets/"?+?obj.name?+?".assetbundle";?? ????????if(BuildPipeline.BuildAssetBundle(obj,null,targetPath,BuildAssetBundleOptions.CollectDependencies)){?? ?? ????????????Debug.Log(obj.name?+?"is?packed?successfully!");?? ????????}else{?? ????????????Debug.Log(obj.name?+?"is?packed?failly!");?? ????????}?? ????}?? ?????? ????AssetDatabase.Refresh?();?? }??
SelectionMode.DeepAssets
這個選擇模式意味著如果選擇中包含多個文件，那么他將包含這個文件視圖中的所有資源。
他還有其他的各種選項（以下是官方文檔）
SelectionMode
Description
SelectionMode can be used to tweak the selection returned by Selection.GetTransforms.
The default transform selection mode is: SelectionMode.TopLevel | SelectionMode.ExcludePrefab | SelectionMode.Editable.
| Unfiltered | Return the whole selection. |
| TopLevel | Only return the topmost selected transform. A selected child of another selected transform will be filtered out. |
| Deep | Return the selection and all child transforms of the selection. |
| ExcludePrefab | Excludes any prefabs from the selection. |
| Editable | Excludes any objects which shall not be modified. |
| Assets | Only return objects that are assets in the Asset directory. |
| DeepAssets | If the selection contains folders, also include all assets and subfolders within that folder in the file hierarchy. |
最核心的方法：BuildPipeline.BuildAssetBundle (obj, null, targetPath, BuildAssetBundleOptions.CollectDependencies)
參數(shù)1：它只能放一個對象，因為我們這里是分別打包，所以通過循環(huán)將每個對象分別放在了這里。
參數(shù)2：可以放入一個數(shù)組對象。
參數(shù)3：要打包到的路徑
參數(shù)4：默認情況下打的包只能在電腦上用，如果要在手機上用就要添加一個參數(shù)。
Android上：
BuildPipeline.BuildAssetBundle (obj, null, targetPath, BuildAssetBundleOptions.CollectDependencies,BuildTarget.Android)
IOS上:
BuildPipeline.BuildAssetBundle (obj, null, targetPath, BuildAssetBundleOptions.CollectDependencies,BuildTarget.iPhone)
另外，電腦上和手機上打出來的Assetbundle不能混用，不同平臺只能用自己的。
三、一起打包
[csharp]?view plaincopy print?
?? ?? ?? [MenuItem("AssetBundleDemo/Create?AssetBundles?Together")]?? static?void?CreateAssetBundleTogether(){?? ?????? ????Object[]?selects?=?Selection.GetFiltered?(typeof(Object),SelectionMode.DeepAssets);?? ?????? ????string?targetPath?=?Application.dataPath?+?"/AssetBundleLearn/StreamingAssets/Together.assetbundle";?? ????if(BuildPipeline.BuildAssetBundle(null,selects,targetPath,BuildAssetBundleOptions.CollectDependencies)){?? ????????Debug.Log("Packed?successfully!");?? ?? ????}else{?? ????????Debug.Log("Packed?failly!");?? ????}?? ?????? ????AssetDatabase.Refresh?();?? }??
四、讀取
[csharp]?view plaincopy print?
using?UnityEngine;?? using?System.Collections;?? ?? public?class?ReanAssetbundle?:?MonoBehaviour?{?? ?? ?????? ????public?static?readonly?string?m_PathURL?=?? ????????#if?UNITY_ANDROID?? ????????"jar:file://"?+?Application.dataPath?+?"!/assets/";?? ????????#elif?UNITY_IPHONE?? ????????Application.dataPath?+?"/Raw/";?? ????????#elif?UNITY_STANDALONE_WIN?||?UNITY_EDITOR?? ????????"file://"?+?Application.dataPath?+?"/AssetBundleLearn/StreamingAssets/";?? ????????#else?? ????????string.Empty;?? ????????#endif?? ?? ????void?OnGUI(){?? ????????if(GUILayout.Button("加載分開打包的Assetbundle")){?? ????????????StartCoroutine(LoadGameObjectPackedByThemselves(m_PathURL?+?"One.assetbundle"));?? ????????????StartCoroutine(LoadGameObjectPackedByThemselves(m_PathURL?+??"Two.assetbundle"));?? ????????????StartCoroutine(LoadGameObjectPackedByThemselves(m_PathURL?+?"Three.assetbundle"));?? ?? ????????}?? ?????????? ????????if(GUILayout.Button("加載打包在一起的Assetbundle")){?? ????????????StartCoroutine(LoadGameObjectPackedTogether(m_PathURL?+?"Together.assetbundle"));?? ????????}?? ?????????? ????}?? ?????? ????private?IEnumerator?LoadGameObjectPackedByThemselves(string?path){?? ????????WWW?bundle?=?new?WWW?(path);?? ????????yield?return?bundle;?? ?? ?????????? ????????yield?return?Instantiate?(bundle.assetBundle.mainAsset);?? ????????bundle.assetBundle.Unload?(false);?? ????}?? ?? ????IEnumerator??LoadGameObjectPackedTogether?(string?path)?? ????{?? ????????WWW?bundle?=?new?WWW?(path);?? ????????yield?return?bundle;?? ?? ????????Object?one?=?bundle.assetBundle.Load?("One");?? ????????Object?two?=?bundle.assetBundle.Load?("Two");?? ????????Object?three?=?bundle.assetBundle.Load?("Three");?? ?? ?????????? ????????yield?return?Instantiate?(one);?? ????????yield?return?Instantiate?(two);?? ????????yield?return?Instantiate?(three);?? ????????bundle.assetBundle.Unload?(false);?? ????}?? }??
總結
以上是生活随笔為你收集整理的一、创建Assetbundle 在unity3d开发的游戏中，无论模型，音频，还是图片等，我们都做成Prefab，然后打包成Assetbundle，方便我们后面的使用，来达到资源的更新。的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。
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