（转）【风宇冲】Unity3D教程宝典之AssetBundles:第一讲

1. using UnityEngine;
2. using UnityEditor;
3. public class ExportAssetBundles {
4.     [MenuItem("Assets/Build AssetBundle From Selection - Track dependencies")]
5.     static void ExportResource () {
6.         // Bring up save panel
7.         string path = EditorUtility.SaveFilePanel ("Save Resource", "", "New Resource","unity3d");
8.         if (path.Length != 0) {
9.             // Build the resource file from the active selection.
10.             Object[] selection = Selection.GetFiltered(typeof(Object), SelectionMode.DeepAssets);
11.             BuildPipeline.BuildAssetBundle(Selection.activeObject, selection, 
12. path, BuildAssetBundleOptions.CollectDependencies |BuildAssetBundleOptions.CompleteAssets
13. ,BuildTarget.StandaloneWindows);
14.             Selection.objects = selection;
15.         }
16.     }
17.     [MenuItem("Assets/Build AssetBundle From Selection - No dependency tracking")]
18.     static void ExportResourceNoTrack () {
19.         // Bring up save panel
20.         string path = EditorUtility.SaveFilePanel ("Save Resource", "", "New Resource","unity3d");
21.         if (path.Length != 0) {
22.             // Build the resource file from the active selection.
23.             BuildPipeline.BuildAssetBundle(Selection.activeObject, Selection.objects, path);
24.         }
25.     }
26. }

bool BuildPipeline.BuildAssetBundleExplicitAssetNames(Object[] assets, string[] assetName, string pathName, BuildAssetBundleOptions assetBundleOptions, Buildtarget targetPlatform)
创建bundle并自定义名称。assetName的长度及排列与assets对应。并不是真正改变物体的名称，只是在assetBundle.Load的时候有个唯一对应的名称

 

对上面代码仅需修改第11行。将BuildPipeline.BuildAssetBundle(Selection.activeObject, selection, 

path, BuildAssetBundleOptions.CollectDependencies | BuildAssetBundleOptions.CompleteAssets

,BuildTarget.StandaloneWindows); 里的第一个参数mainAsset去掉，并在selection也就是Object[]之后加string[] assetName即可

 

 

1. [MenuItem("Assets/Build AssetBundle From Selection Names- Track dependencies")]
2.     static void ExportResourceWithNames () {
3.         // Bring up save panel
4.         string path = EditorUtility.SaveFilePanel ("Save Resource", "", "New Resource","unity3d");
5.         if (path.Length != 0) {
6.             // Build the resource file from the active selection.
7.             Object[] selection = Selection.GetFiltered(typeof(Object), SelectionMode.DeepAssets);
8. string[] names = new string[selection.Length];
9. for(int i =0;i
10. {
11. names[i] = i+"_"+ selection[i].name;
12. }
13.             BuildPipeline.BuildAssetBundleExplicitAssetNames( selection,names, 
14. path, BuildAssetBundleOptions.CollectDependencies |BuildAssetBundleOptions.CompleteAssets
15. ,BuildTarget.StandaloneWindows);
16.             Selection.objects = selection;
17.         }
18.     }

 

 

 

 

 

 

 

1. using System;
2. using System.IO;
3. using UnityEngine;
5. public class LoadAssetBundle : MonoBehaviour {
6. private AssetBundle assetBundle;
7. private AssetBundleCreateRequest request;
9. void Update () {
10. }
11. void OnGUI()
12. {
13. if(GUI.Button(new Rect(0,0,100,50),"Load"))
14. {
15. byte[] bs = File.ReadAllBytes(Application.dataPath+ "/withNames.unity3d");
16. request = AssetBundle.CreateFromMemory(bs);
17. }
18. if(GUI.Button(new Rect(0,50,100,50),"Check"))
19. {
20. if(request.isDone == true)
21. {
22. assetBundle = request.assetBundle;
23. UnityEngine.Object obj = assetBundle.Load("0_Cube");
24. Instantiate(obj);
25. }
26. }
27. }

 

 

将场景做成AB时，BuildPipeline.BuildStreamedSceneAssetBundle
3 AssetBundle bundle = www.assetBundle;

WWW.LoadFromCacheOrDownload
下载过程中可以更换下载地址,并保证版本一致, Webplayer的cache限制在50MB以内。
与普通的www下载仅仅是一句代码的区别
WWW www = new WWW(address);
WWW www = WWW.LoadFromCacheOrDownload(address,1);

(2)使用AssetBundles里的资源:
bool AssetBundle.Contains(string name) bundle中是否含有名为name的asset

Object AssetBundle.Load(string name) 读取bundle中名称为name的asset

Object AssetBundle.LoadAll()
UnityEngine.Object[] objs = assetBundle.LoadAll();
在本例中assetBundle.mainAsset是GameObject,但是并不代表assetBundle.LoadAll();的返回值数组的第一个数据是GameObject即obj[0]等于assetBundle.mainAsset


assetBundle.mainAsset

AssetBundle.Unload（bool unloadAllLoadedObjects）
清空bundle里的所有资源。释放相关内存。清空后不能再通过该bundle创建物体。
unloadAllLoadedObjects为false: AssetBundle里的数据将会被释放，不影响已经scene中已经创建的相关物体。
unloadAllLoadedObjects为true: 不仅AssetBundle里的数据将会被释放，从该bundle创建的贴图材质等等asset将会被清空。如果scene中已经物体使用这些，连接将丢失。

 

读取场景:

当AssetBundle下载好后，直接Application.LoadLevel("scene");即可

 

 

1. //******************************************************
2. //AssetBundle.CreateFromMemory -> LoadLevel
3. //******************************************************
4. using System;
5. using System.IO;
6. using UnityEngine;
8. public class LoadAssetBundle : MonoBehaviour {
9. private AssetBundle assetBundle;
10. private AssetBundleCreateRequest request;
12. void Update () {
13. }
14. void OnGUI()
15. {
16. if(GUI.Button(new Rect(0,0,100,50),"Load"))
17. {
18. byte[] bs = File.ReadAllBytes(Application.dataPath+ "/myLevel.unity3d");
19. request = AssetBundle.CreateFromMemory(bs);
20. }
21. if(GUI.Button(new Rect(0,50,100,50),"Check"))
22. {
23. if(request.isDone == true)
24. {
25. Application.LoadLevel("scene");
26. }
27. }
28. }
29. }

其中推荐 LoadFromCacheOrDownload。不推荐CreateFromMemory，因为需要一个解析建AB结构的过程，比较耗时。CreateFromFile也不是很推荐，因为只支持非压缩格式，所以占容量比较多。

 

预制体打包成AssetBundle时：预制体可以搭脚本，并且指定关系等都可以照常使用。

要求：

(1)但是脚本必须是工程里有的

(2)AssetBundle里预制体上搭载的脚本必须和工程里的脚本一致。

否则会提示错误。