AsssetBunlder打包

unity3d，资源过多的话。可以压缩成一个资源包。加载出来后。可以解压。找到自己需要的资源

就想.net网站。很多图标都是放一个大图片上。而不是一个图标就是一个图片

因为是在项目编辑时候给资源打包。并不是项目运行。所以要用到Editor。untiy编辑类，脚本放到Editor文件夹中

using UnityEngine;
using System.Collections;
using UnityEditor;
public class AsssetBunlder
{
    [MenuItem("Custom/SayHello")]
    static void SayHello()
    {
        Debug.Log("hello");
    }

    [MenuItem("Custom/CreateBundle")]
    static void CreateBoundle()
    {
        /*
         * Selection类，在编辑状态下，获取选中的对象引用
         */
        Object[] objs = Selection.GetFiltered(typeof(object), SelectionMode.DeepAssets);

        string path = string.Empty;

        foreach (Object ojb in objs)
        {
            path = Application.streamingAssetsPath + "/" + ojb.name + ".unity3d";
            //创建AssetBunlder
            BuildPipeline.BuildAssetBundle(ojb, null, path);

            //BuildTarget.Android :不同平台打包路径不同
            //BuildPipeline.BuildAssetBundle(ojb, null, path, BuildAssetBundleOptions.CollectDependencies, BuildTarget.Android);
        }
        //自动刷新
        AssetDatabase.Refresh();
    }



    [MenuItem("Custom/CreateAllBundle")]
    static void CreateAllBoundle()
    {
        /*
         * Selection类，在编辑状态下，获取选中的对象引用
         */
        Object[] objs = Selection.GetFiltered(typeof(object), SelectionMode.DeepAssets);

        string path = string.Empty;
        path = Application.streamingAssetsPath + "/All.assetbundle";
        //创建AssetBunlder
        BuildPipeline.BuildAssetBundle(null, objs, path);

        //自动刷新
        AssetDatabase.Refresh();
    }


    //场景打包
    [MenuItem("Custom/StreamBundle")]
    static void StreamBundleScene()
    {
        //要压缩的场景位置
        string[] leves = { "Assets/Scene/Demo2.unity" };

        //压缩后。资源保存的位置
        string path = Application.streamingAssetsPath + @"/Test.assetsbundle";

        /*
         BuildAdditionalStreamedScenes：以流的方式打包场景
         * StandaloneWindows64：在window64位电脑下打包
         */
        BuildPipeline.BuildPlayer(leves, path, BuildTarget.StandaloneWindows64, BuildOptions.BuildAdditionalStreamedScenes);



    }

}

单击菜单。会出现你刚写的菜单选项

单击不同的选项就可以根据不同的资源打包了

当读取资源前必须解压

using UnityEngine;
using System.Collections;

public class AssetBoundleContorller : MonoBehaviour
{


    /*
     * streamingAssetsPath路径。在pc和Andoid,phone中是不同的
     * 所以要用预处理（#if #end if）
     */

    //    public static string RUL;
    //#if UNIYT_ANDROID
    //    "jar:file://"+ Application.dataPath+@"/assets";
    //#elif UNITY_IPHONE
    //    "";
    //#endif


    //#if UNITY_EDITOR
    //    string filepath = Application.dataPath + "/StreamingAssets" + "/my.xml";
    //#elif UNITY_IPHONE
    // string filepath = Application.dataPath +"/Raw"+"/my.xml";
    //#elif UNITY_ANDROID
    // string filepath = "jar:file://" + Application.dataPath + "!/assets/"+"/my.xml;
    //#else

    //#endif

    //    public static string RUL =
    //#if UNITY_IPHONE
    //     string filepath = Application.dataPath +"/assets";
    //#elif UNITY_ANDROID
    //     "jar:file://" + Application.dataPath + "/assets/";
    //#else
    // Application.streamingAssetsPath + @"/Sphere.unity3d";
    //#endif



    string filepath = string.Empty;
    void Awake()
    {
        #if UNITY_ANDROID
            filepath = "jar:file://" + Application.dataPath +@"/assets";
        #endif

        #if UNITY_IPHONE
            filepath = "Application.dataPath +@"/Raw";
        #endif

        #if UNITY_STANDALONE_WIN
            filepath = @"file://" + Application.streamingAssetsPath + @"/assets";
        #endif
    }


    // Use this for initialization
    void Start()
    {
        //1:拿到我们的Assetboundle

        //string path = @"file://" + Application.streamingAssetsPath + "/Sphere.unity3d";

        //StartCoroutine(GetAssetboundle(path));

        string path = @"file://" + Application.streamingAssetsPath + "/all.assetbundle";
        StartCoroutine(GetAssetboundle(path, "Sphere"));
    }

    /// <summary>
    /// 加载一个资源包
    /// </summary>
    /// <param name="path"></param>
    /// <returns></returns>
    IEnumerator GetAssetboundle(string path)
    {
        //没有缓存
        WWW www = new WWW(path);


        //缓存机制，缓存在 硬盘中  5代码版本号，每次缓存都会加1
        WWW www1 = WWW.LoadFromCacheOrDownload(path, 5);

        yield return www;
        //2:解压并实例化出来
        //www.assetBundl返回的是加载AssetBundle压缩文件
        //www.assetBundle.mainAsset：解压获取到物体
        Instantiate(www.assetBundle.mainAsset);

        //销毁assetBundle的内存
        www.assetBundle.Unload(false);
    }



    /// <summary>
    /// 很多资源打包在一起，根据名称找到相应的资源
    /// </summary>
    /// <param name="path"></param>
    /// <param name="name"></param>
    /// <returns></returns>
    IEnumerator GetAssetboundle(string path, string name)
    {
        WWW www = new WWW(path);
        yield return www;

        //查看资源里面所以的子资源
        //www.assetBundle.LoadAll;


        //Load 根据名字加载资源
        Instantiate(www.assetBundle.Load(name));
    }


    // Update is called once per frame
    void Update()
    {
        //加载场景
        if (Input.GetMouseButtonDown(0))
        {
            string path = @"file://" + Application.streamingAssetsPath + "/Test.assetsbundle";
            StartCoroutine(LoadScene(path, "Demo2"));
        }
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="path"></param>
    /// <param name="name">打包场景前的scene名称</param>
    /// <returns></returns>
    IEnumerator LoadScene(string path, string name)
    {
        WWW www = new WWW(path);
        yield return www;

        //使用之前必须要解压assetbundle
        AssetBundle bundle = www.assetBundle;

        //加载场景
        Application.LoadLevel(name);

        www.assetBundle.Unload(false);

    }
}

 对于不同平台打包路径是不同的。具体看

http://docs.unity3d.com/Manual/PlatformDependentCompilation.html

http://www.taidous.com/article-417-1.html

http://unity3d.9tech.cn/jiaocheng/2013/0621/32651.html