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<!DOCTYPE html>
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<p><a target="_blank" rel="noopener" href="https://docs.unity3d.com/Manual/Playables.html">Playables</a></p>
<p><code>Playables API</code>通过在被称为<code>PlayableGraph</code>的树状结构中组织和评估数据源来创建工具、效果或其他游戏机制。<code>PlayableGraph</code>允许你混合、融合和修改多个数据源，并通过一个单一的输出来播放它们。数据源可以是动画、音频和脚本类型，<code>Playables API</code>还提供了通过脚本与动画系统和音频系统互动的能力。</p>
<h2 id="Playables-vs-Animation"><a href="#Playables-vs-Animation" class="headerlink" title="Playables vs Animation"></a>Playables vs Animation</h2><p><code>Animation</code>有一个图形编辑工具，这是一个状态机系统，只限于播放动画。但<code>Playables API</code>支持其他系统，允许创建状态机无法实现的图形。这些图表示数据流，表明每个节点产生和消耗的东西。此外，单个图形不限于单个系统。一个单一的图可以包含动画、音频和脚本的节点。<br>![[Pasted image 20230331102208.png]]</p>
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<p><a target="_blank" rel="noopener" href="https://docs.unity3d.com/2023.1/Documentation/Manual/StandardShaderMaterialParameterAlbedoColor.html">Albedo Color and Transparency</a></p>
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<p><a target="_blank" rel="noopener" href="https://docs.unity3d.com/Manual/AssetBundlesIntro.html">Asset Bundles</a></p>
<hr>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br></pre></td><td class="code"><pre><span class="line">```</span><br><span class="line">***</span><br><span class="line">## 工作流</span><br><span class="line">### AssetBundle里有什么？</span><br><span class="line">- 序列化文件：包含你的资产（应该是ScriptableObject的代码），这些资产被分解成各自的对象并被写入这个单一的文件。</span><br><span class="line">- 资源文件：保存了二进制数据（纹理和音效），允许Unity从另一个线程有效的加载资产。</span><br><span class="line"></span><br><span class="line">### 指定AssetBundle（AB包）资产的步骤</span><br><span class="line">指定AB包资产的步骤如下。 </span><br><span class="line">1. 从你的项目视图中选择你想分配给一个AB包的资产。 </span><br><span class="line">2. 在`Inspector`中检查该对象 。</span><br><span class="line">3. 在`Inspector`的底部，有两个下拉菜单用于分配AB包（左）和`Variants`（右）。</span><br><span class="line">4. 当前左侧下拉菜单显示为 `None`，这里表示资产没有分配AB包。点击`New`来创建一个新的`AB包`。 </span><br><span class="line">6. 输入AB包名称。（AB包名称支持文件夹结构，使用`environment/forest`可以在在`environment`子文件夹下创建一个名为`forest`的包。 ）</span><br><span class="line">9. 一旦你选择或创建了一个AB包，你还可以在右边的另一个下拉菜单中分配或创建一个`Variants`。但构建AB包不需要`Variants`。</span><br><span class="line"></span><br><span class="line">### 打一个AB包</span><br><span class="line"></span><br><span class="line">``` C#</span><br><span class="line">using UnityEditor; </span><br><span class="line">using System.IO; </span><br><span class="line">public class CreateAssetBundles </span><br><span class="line">{ </span><br><span class="line"> [MenuItem("Assets/Build AssetBundles")] </span><br><span class="line"> static void BuildAllAssetBundles() </span><br><span class="line"> { </span><br><span class="line"> string assetBundleDirectory = "Assets/AssetBundles";</span><br><span class="line"> if(!Directory.Exists(assetBundleDirectory)) { </span><br><span class="line"> Directory.CreateDirectory(assetBundleDirectory); </span><br><span class="line"> } </span><br><span class="line"> BuildPipeline.BuildAssetBundles(assetBundleDirectory, </span><br><span class="line"> BuildAssetBundleOptions.None, </span><br><span class="line"> BuildTarget.StandaloneWindows); </span><br><span class="line"> } </span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<ol>
<li><code>assetBundleDirectory</code>：AssetBundleDirectory的输出文件夹</li>
<li><code>BuildAssetBundleOptions</code>：有三个BuildAssetBundleOptions选项决定了AB包压缩算法</li>
</ol>
<ul>
<li><code>BuidAssetBundleOptions.None</code><br>默认打包选项，使用全文压缩（LZMA）打包。包体更小，适合需要下载的AB包；但缺点是，读取一个资产需要加载AB包全部资产。</li>
<li><code>BuidAssetBundleOptions.UncompressedAssetBundle</code><br>以完全不压缩数据的方式打包。未压缩的缺点是文件下载尺寸较大。然而，下载后的加载时间会快很多。未压缩的AB包是16字节对齐的。</li>
<li><code>BuildAssetBundleOptions.ChunkBasedCompression</code><br>使用基于块的压缩（LZ4）打包。在AB包内，每128KB的内容就被压缩一次。文件大小会比LZMA大；但是，可以有选择的检索和加载资产。加载时间和加载未压缩的AB包相当，但更小。<blockquote>
<p>[[关于压缩#AB包的压缩]]</p>
</blockquote>
</li>
</ul>
<ol>
<li><code>BuildTarget</code><br>可以选择不同平台来打包，使用<code>activeBuildTarget</code>可以根据现在选择的平台打包。</li>
</ol>
<h3 id="下载和加载AB包和资产"><a href="#下载和加载AB包和资产" class="headerlink" title="下载和加载AB包和资产"></a>下载和加载AB包和资产</h3><p>AB包可以分布在下面几个地方</p>
<ul>
<li><code>StreamingAssets</code>文件夹中，需要在<code>Player build</code>中引用。 </li>
<li>由网络服务托管，使用·UnityWebRequestAssetBundle·下载。 </li>
<li>通过你自己的下载或安装代码进行分发。这种方法需要更多的开发工作，但确实提供了灵活性，在使用Unity API加载文件之前，可以完全控制压缩、缓存、修补和验证等方面。</li>
</ul>
<h2 id="如何准备资产"><a href="#如何准备资产" class="headerlink" title="如何准备资产"></a>如何准备资产</h2><p>定义AB包有一下规则</p>
<ul>
<li>场景和资产不能放在同一个AB包中。一个单独的AB包只能包含场景或资产。 </li>
<li>一个特定的场景或资产不能分配给一个以上的AB包。 </li>
<li>AB包不能包含脚本资产 </li>
<li><code>StreamingAssets</code>文件夹中的文件不能放AB包中。 </li>
<li>AB包的名称不能与输出文件夹的名称一致<br>虽然可以自由的分配AssetBundles的资产，但有一些分组策略会很有用。</li>
</ul>
<h3 id="Logical-Entity-Grouping"><a href="#Logical-Entity-Grouping" class="headerlink" title="Logical Entity Grouping"></a>Logical Entity Grouping</h3><p>逻辑实体分组是指根据资产所代表的项目功能部分将其分配给资产包。这包括诸如用户界面、角色、环境和其他任何可能在应用程序的生命周期中频繁出现的部分。</p>
<h3 id="Type-Grouping"><a href="#Type-Grouping" class="headerlink" title="Type Grouping"></a>Type Grouping</h3><p>将把类型相似的资产，如音轨或语言本地化文件，分配给一个资产包。</p>
<h3 id="Concurrent-Content-Grouping"><a href="#Concurrent-Content-Grouping" class="headerlink" title="Concurrent Content Grouping"></a>Concurrent Content Grouping</h3><p>并发内容分组是指你将资产捆绑在一起，在同一时间加载和使用。你可以认为这些类型的捆绑用于基于关卡的游戏，每个关卡都包含完全独特的角色、纹理、音乐等。你要绝对确定这些资产包中的某项资产只在该资产包中的其他资产被使用时才会被使用。在一个并发内容分组捆绑中，对单一资产的依赖将导致加载时间的显著增加。你将被迫下载整个捆绑包的单一资产。</p>
<blockquote>
<p>Tips:</p>
<ul>
<li>将经常更新的对象与很少变化的对象分开到AssetBundles中。 </li>
<li>将可能被同时加载的对象分为一组。比如一个模型，它的纹理，和它的动画。 </li>
<li>如果你注意到多个AssetBundles中的多个对象依赖于一个完全不同的AssetBundle中的一个资产，请将这个依赖关系转移到一个单独的AssetBundle中。如果几个AssetBundles引用了其他AssetBundles中的同一组资产，可能值得将这些依赖关系拉到一个共享的AssetBundle中以减少重复。 </li>
<li>如果两组对象不太可能同时被加载，例如标准和高清资产，请确保它们分离在自己的资产包中。 </li>
<li>如果一个资产包中只有不到50%的内容经常被同时加载，那么可以考虑将该资产包拆开。 </li>
<li>考虑合并规模较小（少于五到十个资产）但其内容经常被同时加载的资产包。 </li>
<li>如果一组对象只是同一对象的不同版本，可以考虑资产包的变量。</li>
</ul>
</blockquote>
<h2 id="AB包依赖"><a href="#AB包依赖" class="headerlink" title="AB包依赖"></a>AB包依赖</h2><p>如果两个资产都在AB包中，当一个资源引用另一个资产时会发送AB包依赖；如果这个资产不在另一个AB包中，AB包会复制这个资产到自己的AB中。如果多个AB包引用同一个资产，可以把这个资产打一个AB包，避免多次复制。</p>
<h2 id="生成的输出"><a href="#生成的输出" class="headerlink" title="生成的输出"></a>生成的输出</h2><p>编译成功的ab包有2*(n+1)个文件，对于你在编辑器中指定的每一个AssetBundle，你会注意到一个文件，其中有你的AssetBundle名称和你的AssetBundle名称+”.manifest”。还会有一个额外的捆绑和清单，与您创建的任何AssetBundle不共享一个名字。相反，它是以它所在的目录命名的（AssetBundles被构建到哪里），这就是Manifest Bundle。这个捆绑包包含了AssetBundleManifest对象，它对于确定在运行时要加载哪些捆绑包的依赖关系非常有用。</p>
<h3 id="AssetBundle文件"><a href="#AssetBundle文件" class="headerlink" title="AssetBundle文件"></a>AssetBundle文件</h3><p>这个文件是你在运行时要用来加载资产的文件，它缺少了<code>.manifest</code>文件。内部包含多个文件的存档。<br>![[Pasted image 20230315111655.png]]<br>主文件使用Unity的二进制序列化格式。它包含了<code>AssetBundle</code>对象和AssetBundle中所有资产（显式或隐式）的对象。任何音频、视频内容将被存储在一个<code>.resource</code>文件中，任何纹理数据将被存储在一个<code>.resS</code>文件中。</p>
<h3 id="Manifest文件"><a href="#Manifest文件" class="headerlink" title="Manifest文件"></a>Manifest文件</h3><p>对于每一个生成的包，包括额外的清单包，都会生成一个相关的清单文件。清单文件的扩展名为<code>.manifest</code>，可以用任何文本编辑器打开。它包含循环冗余检查（CRC）数据和捆绑包的依赖性数据等信息。普通资产包的清单文件看起来是这样的。<br><figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">ManifestFileVersion:</span> <span class="number">0</span></span><br><span class="line"><span class="attr">CRC:</span> <span class="number">2422268106</span> </span><br><span class="line"><span class="attr">Hashes:</span> </span><br><span class="line"> <span class="attr">AssetFileHash:</span> </span><br><span class="line"> <span class="attr">serializedVersion:</span> <span class="number">2</span> </span><br><span class="line"> <span class="attr">Hash:</span> <span class="string">8b6db55a2344f068cf8a9be0a662ba15</span> </span><br><span class="line"> <span class="attr">TypeTreeHash:</span> </span><br><span class="line"> <span class="attr">serializedVersion:</span> <span class="number">2</span> </span><br><span class="line"> <span class="attr">Hash:</span> <span class="string">37ad974993dbaa77485dd2a0c38f347a</span> </span><br><span class="line"><span class="attr">HashAppended:</span> <span class="number">0</span> </span><br><span class="line"><span class="attr">ClassTypes:</span> </span><br><span class="line"><span class="bullet">-</span> <span class="attr">Class:</span> <span class="number">91</span> </span><br><span class="line"> <span class="attr">Script:</span> {<span class="attr">instanceID:</span> <span class="number">0</span>} <span class="attr">Assets: Asset_0: Assets/Mecanim/StateMachine.controller Dependencies:</span> {}</span><br></pre></td></tr></table></figure></p>
<h3 id="Manifest-Bundle"><a href="#Manifest-Bundle" class="headerlink" title="Manifest Bundle"></a>Manifest Bundle</h3><p>还有两个额外的文件会生成。 第一个是一个小的<code>AssetBundle</code>，以它所在的目录命名（AssetBundles被构建到哪里）。这个文件被称为<code>Manifest Bundle</code>，它包含了<code>AssetBundleManifest</code>对象，用于确定在运行时要加载哪些AB包依赖。[Using AssetBundles Natively] </p>
<p>还会为<code>Manifest Bundle</code>生成一个<code>.manifest</code>文件。其内容大致如下：<br><figure class="highlight dts"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="symbol">ManifestFileVersion:</span> <span class="number">0</span> </span><br><span class="line"><span class="symbol">AssetBundleManifest:</span> </span><br><span class="line"><span class="symbol"> AssetBundleInfos:</span> </span><br><span class="line"><span class="symbol"> Info_0:</span> </span><br><span class="line"><span class="symbol"> Name:</span> scene1assetbundle </span><br><span class="line"><span class="symbol"> Dependencies:</span> {}</span><br></pre></td></tr></table></figure><br><code>Manifest Bundle</code>的<code>.manifest</code>文件记录了AB包的关系，以及它们的依赖关系是什么。这与<code>Manifest Bundle</code>内的<code>AssetBundleManifest</code>对象所记录的信息类似，由于它是一个文本文件，所以便于人类阅读和外部工具的解析。这个<code>.manifest</code>文件对于防止您在AB包中使用的类型的代码剥离非常重要，如果这些类型不被您的<code>Player build</code>中的内容所使用。如果在您的<code>Player Settings</code>中启用了代码剥离功能<br>则应在执行播放器构建时通过设置<code>BuildPlayerOptions.assetBundleManifestPath</code>传递该清单的路径。[分布大小和代码剥离]。</p>
<h2 id="使用原生AB包"><a href="#使用原生AB包" class="headerlink" title="使用原生AB包"></a>使用原生AB包</h2><p>有两个不同的API，用来加载AB包。 </p>
<ul>
<li><code>AssetBundle</code>对象上的静态加载方法，例如<code>AssetBundle.LoadFromFile</code>。 </li>
<li><code>UnityWebRequest</code>对资产包的支持，例如<code>UnityWebRequestAssetBundle.GetAssetBundle</code>。<h3 id="AssetBundle-LoadFromFile"><a href="#AssetBundle-LoadFromFile" class="headerlink" title="AssetBundle.LoadFromFile"></a>AssetBundle.LoadFromFile</h3>这个API在从本地存储加载未压缩和分块压缩包（LZ4）时效率很高，因为它可以直接从磁盘上增量读取文件的内容。使用这种方法加载一个被全文件压缩的文件<br>(LZMA)的文件时，效率较低，因为它需要先将文件完全解压到内存中。 </li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">public class LoadFromFileExample : MonoBehaviour </span><br><span class="line">{ </span><br><span class="line"> void Start() { </span><br><span class="line"> //AssetBundle.LoadFromFileAsync异步加载，比如AB包不在本地</span><br><span class="line"> var myLoadedAssetBundle </span><br><span class="line"> = AssetBundle.LoadFromFile(Path.Combine(Application.streamingAssetsPath, "myassetBundle")); </span><br><span class="line"> if (myLoadedAssetBundle == null) </span><br><span class="line"> { </span><br><span class="line"> Debug.Log("Failed to load AssetBundle!"); </span><br><span class="line"> return; </span><br><span class="line"> } </span><br><span class="line"> var prefab = myLoadedAssetBundle.LoadAsset<GameObject>("MyObject"); </span><br><span class="line"> Instantiate(prefab); </span><br><span class="line"> } </span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<h3 id="UnityWebRequestAssetBundle"><a href="#UnityWebRequestAssetBundle" class="headerlink" title="UnityWebRequestAssetBundle"></a>UnityWebRequestAssetBundle</h3><p>如果你的资产包是在线托管的，或者你运行的平台不支持直接访问文件系统，那么就使用UnityWebRequestAssetBundle API。<br><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">IEnumerator InstantiateObject() </span><br><span class="line">{ </span><br><span class="line"> string url = "file:///" + Application.dataPath + "/AssetBundles/" + assetBundleName;</span><br><span class="line"> var request = UnityEngine.Networking.UnityWebRequestAssetBundle.GetAssetBundle(url, 0); </span><br><span class="line"> yield return request.Send(); </span><br><span class="line"> AssetBundle bundle = UnityEngine.Networking.DownloadHandlerAssetBundle.GetContent(request); </span><br><span class="line"> GameObject cube = bundle.LoadAsset<GameObject>("Cube"); </span><br><span class="line"> GameObject sprite = bundle.LoadAsset<GameObject>("Sprite"); </span><br><span class="line"> Instantiate(cube); </span><br><span class="line"> Instantiate(sprite); }</span><br></pre></td></tr></table></figure><br>为了简单起见，这个例子显示了代码中硬编码的CRC值。但在实践中，您的资产包的预期CRC值将被单独下载，或在下载资产包之前从文件中检索。请参阅资产包下载的完整性和安全性。 </p>
<blockquote>
<p>注意：为了避免每次调用此代码时下载整个AssetBundle内容，你可以为你的AssetBundle启用缓存。这是通过调用<code>UnityWebRequestAssetBundle.GetAssetBundle</code>时传递AB包的哈希值来实现的。哈希值可以从<code>AssetBundle Manifest</code>中获得。该哈希值作为你所请求的资产包的精确构建的版本标识。请参阅AssetBundle压缩和缓存，了解缓存的细节和压缩的相关注意事项。</p>
</blockquote>
<h3 id="从AB包加载资产"><a href="#从AB包加载资产" class="headerlink" title="从AB包加载资产"></a>从AB包加载资产</h3><p><a target="_blank" rel="noopener" href="https://docs.unity3d.com/2023.1/Documentation/Manual/AssetBundles-Native.html">https://docs.unity3d.com/2023.1/Documentation/Manual/AssetBundles-Native.html</a></p>
<h2 id="为AssetBundles准备资产"><a href="#为AssetBundles准备资产" class="headerlink" title="为AssetBundles准备资产"></a>为AssetBundles准备资产</h2>
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<p><a target="_blank" rel="noopener" href="https://docs.unity3d.com/Manual/Coroutines.html">Coroutine</a><br>coroutine允许你将任务分散到几个帧中。在Unity中，coroutine是一个可以暂停执行并将控制权返回给Unity的方法，但在下一帧继续执行它所离开的地方。 </p>
<p>在大多数情况下，当你调用一个方法时，它会运行到完成，然后将控制权返回给调用方法，再加上任何可选的返回值。这意味着在一个方法中发生的任何动作都必须在单帧更新中发生。 </p>
<p>在你想用一个方法调用来包含一个程序性动画或一个随时间变化的事件序列的情况下，你可以使用一个循环程序。 </p>
<p>然而，重要的是要记住，coroutines并不是线程。在coroutine中运行的同步操作仍然在主线程上执行。如果你想减少花在主线程上的CPU时间，那么避免在coroutine中进行阻塞操作就和在其他脚本代码中一样重要。如果你想在Unity中使用多线程代码，可以考虑使用C#作业系统。 </p>
<p>如果你需要处理长时间的异步操作，如等待HTTP传输、资产加载或文件I/O完成，最好使用coroutines。<br><a target="_blank" rel="noopener" href="https://blog.csdn.net/tkokof1/article/details/11842673">深究Coroutine原理</a><br>[自动生成状态机]<a target="_blank" rel="noopener" href="https://csharpindepth.com/Articles/IteratorBlockImplementation">https://csharpindepth.com/Articles/IteratorBlockImplementation</a></p>
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<p><a target="_blank" rel="noopener" href="https://docs.unity3d.com/Packages/com.unity.entities@1.0/manual/ecs-packages.html">ecs-packages</a></p>
<h2 id="使用的包"><a href="#使用的包" class="headerlink" title="使用的包"></a>使用的包</h2><h3 id="DOTS技术使用的包"><a href="#DOTS技术使用的包" class="headerlink" title="DOTS技术使用的包"></a>DOTS技术使用的包</h3><ul>
<li>Entities</li>
<li>C# Job System</li>
<li>Burst compiler</li>
<li>Collections</li>
<li>Mathmatics<h3 id="ECS包"><a href="#ECS包" class="headerlink" title="ECS包"></a>ECS包</h3></li>
<li>Unity Physics</li>
<li>Havok Physics for Unity</li>
<li>Netcode for Entities</li>
<li>Entitites Graphics</li>
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<p><code>Entities</code>包是Unity面向数据的技术栈（DOTS）的一部分，为实体组件系统（ECS）架构提供了面向数据的实现。</p>
<h3 id="Recommended-packages"><a href="#Recommended-packages" class="headerlink" title="Recommended packages"></a>Recommended packages</h3><p>[[Entities.Graphics]]</p>
<h3 id="IDE-support"><a href="#IDE-support" class="headerlink" title="IDE support"></a>IDE support</h3><p><a target="_blank" rel="noopener" href="https://learn.microsoft.com/en-us/dotnet/csharp/roslyn-sdk/source-generators-overview">Microsoft Source Generator</a></p>
<h3 id="Domain-Reload-Setting"><a href="#Domain-Reload-Setting" class="headerlink" title="Domain Reload Setting"></a>Domain Reload Setting</h3><p>为什么要把<code>Reload Domain</code>和<code>Reload Scene</code>关闭</p>
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