打包Assetbundle并加载

来源：互联网发布：深圳原画培训知乎编辑：程序博客网时间：2024/04/27 18:02

转自：http://blog.csdn.net/dingxiaowei2013/article/details/17439887

由于我们要将模型资源放在远程的服务器端，但如果直接放fbx模型是不可以加载的，所以我们可以将fbx做成预设或者是直接将其打包成assetbundle格式的，然后通过www来加载获取。

1.首先要讲一下不同平台下的一个StreamingAssets路径，这是不同的。

[csharp] view plaincopyprint?

//不同平台下StreamingAssets的路径是不同的，这里需要注意一下。
public static readonly string PathURL =
#if UNITY_ANDROID //安卓
"jar:file://" + Application.dataPath + "!/assets/";
#elif UNITY_IPHONE //iPhone
Application.dataPath + "/Raw/";
#elif UNITY_STANDALONE_WIN || UNITY_EDITOR //windows平台和web平台
"file://" + Application.dataPath + "/StreamingAssets/";
#else
string.Empty;
#endif

这就获取到了不同平台的一个路径，我们可以将打包的文件放在这些路径下，然后再从这路径去读取资源。

2.关于打包assetbundle的脚本

[csharp] view plaincopyprint?

using UnityEngine;
using System.Collections;
using UnityEditor;
public class Test : Editor
{
//打包单个
[MenuItem("Custom Editor/Create AssetBunldes Main")]
static void CreateAssetBunldesMain ()
{
//获取在Project视图中选择的所有游戏对象
Object[] SelectedAsset = Selection.GetFiltered (typeof(Object), SelectionMode.DeepAssets);
//遍历所有的游戏对象
foreach (Object obj in SelectedAsset)
{
//本地测试：建议最后将Assetbundle放在StreamingAssets文件夹下，如果没有就创建一个，因为移动平台下只能读取这个路径
//StreamingAssets是只读路径，不能写入
//服务器下载：就不需要放在这里，服务器上客户端用www类进行下载。
string targetPath = Application.dataPath + "/StreamingAssets/" + obj.name + ".assetbundle";
if (BuildPipeline.BuildAssetBundle (obj, null, targetPath, BuildAssetBundleOptions.CollectDependencies)) {
Debug.Log(obj.name +"资源打包成功");
}
else
{
Debug.Log(obj.name +"资源打包失败");
}
}
//刷新编辑器
AssetDatabase.Refresh ();
}
[MenuItem("Custom Editor/Create AssetBunldes ALL")]
static void CreateAssetBunldesALL ()
{
Caching.CleanCache ();
string Path = Application.dataPath + "/StreamingAssets/ALL.assetbundle";
Object[] SelectedAsset = Selection.GetFiltered (typeof(Object), SelectionMode.DeepAssets);
foreach (Object obj in SelectedAsset)
{
Debug.Log ("Create AssetBunldes name :" + obj);
}
//这里注意第二个参数就行
if (BuildPipeline.BuildAssetBundle (null, SelectedAsset, Path, BuildAssetBundleOptions.CollectDependencies)) {
AssetDatabase.Refresh ();
} else {
}
}
[MenuItem("Custom Editor/Create Scene")]
static void CreateSceneALL ()
{
//清空一下缓存
Caching.CleanCache();
string Path = Application.dataPath + "/MyScene.unity3d";
string []levels = {"Assets/Level.unity"};
//打包场景
BuildPipeline.BuildPlayer( levels, Path,BuildTarget.WebPlayer, BuildOptions.BuildAdditionalStreamedScenes);
AssetDatabase.Refresh ();
}
}

前提要新手动创建一个StreamingAssets文件夹

3.读取资源，这里只举例从本地读取，跟从网络读取是一样的，可以参考官方文档：

http://game.ceeger.com/Script/WWW/WWW.html

[csharp] view plaincopyprint?

using UnityEngine;
using System.Collections;
public class RunScript : MonoBehaviour
{
//不同平台下StreamingAssets的路径是不同的，这里需要注意一下。
public static readonly string PathURL =
#if UNITY_ANDROID
"jar:file://" + Application.dataPath + "!/assets/";
#elif UNITY_IPHONE
Application.dataPath + "/Raw/";
#elif UNITY_STANDALONE_WIN || UNITY_EDITOR
"file://" + Application.dataPath + "/StreamingAssets/";
#else
string.Empty;
#endif
void OnGUI()
{
if(GUILayout.Button("Main Assetbundle"))
{
//StartCoroutine(LoadMainGameObject(PathURL + "Prefab0.assetbundle"));
//StartCoroutine(LoadMainGameObject(PathURL + "Prefab1.assetbundle"));
StartCoroutine(LoadMainCacheGameObject(PathURL + "Prefab0.assetbundle"));
StartCoroutine(LoadMainCacheGameObject(PathURL + "Prefab1.assetbundle"));
}
if(GUILayout.Button("ALL Assetbundle"))
{
StartCoroutine(LoadALLGameObject(PathURL + "ALL.assetbundle"));
}
if(GUILayout.Button("Open Scene"))
{
StartCoroutine(LoadScene());
}
}
//读取一个资源
private IEnumerator LoadMainGameObject(string path)
{
WWW bundle = new WWW(path);
yield return bundle;
//加载到游戏中
yield return Instantiate(bundle.assetBundle.mainAsset);
bundle.assetBundle.Unload(false);
}
//读取全部资源
private IEnumerator LoadALLGameObject(string path)
{
WWW bundle = new WWW(path);
yield return bundle;
//通过Prefab的名称把他们都读取出来
Object obj0 = bundle.assetBundle.Load("Prefab0");
Object obj1 = bundle.assetBundle.Load("Prefab1");
//加载到游戏中
yield return Instantiate(obj0);
yield return Instantiate(obj1);
bundle.assetBundle.Unload(false);
}
private IEnumerator LoadMainCacheGameObject(string path)
{
WWW bundle = WWW.LoadFromCacheOrDownload(path,5);
yield return bundle;
//加载到游戏中
yield return Instantiate(bundle.assetBundle.mainAsset);
bundle.assetBundle.Unload(false);
}
private IEnumerator LoadScene()
{
WWW download = WWW.LoadFromCacheOrDownload ("file://"+Application.dataPath + "/MyScene.unity3d", 1);
yield return download;
var bundle = download.assetBundle;
Application.LoadLevel ("Level");
}
}

如果assetbundle文件放在服务器端，直接用www.loadfromcacheordownload()通过版本来控制是否从服务器下载并保存到本地。本人亲自测试，这个方法是能下载到本地的，至于下载在本地哪儿我就不太清楚了，希望知道的同志们告知一下！

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