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  "contentMarkdown": "# Unity2018.4上材质对贴图的冗余引用是否可以不管？\n\n> [!note] 我的 UWA 问答\n> 本文收录我在 UWA 问答发表的公开回答。问题内容归原提问者；回答保留当时语境，技术结论可能受 Unity 版本、平台和项目条件限制。\n\n## 问题\n\n打包后使用AssetHunter插件分析发现有很多冗余引用，但是在游戏中使用Profiler却没有\n\n打开材质文件发现保存了很多旧的贴图引用信息\n\n![image.png](assets/60a65af06bb31032f9791779/01.png)\n\n如_CloudTex这个，是旧版本使用过的，新的Shader里都没有这个属性了\n\n一般的查找引用的方法是找到所有关联的GUID，那就会找到这些旧的引用\n\n但在手机上使用Profiler看内存时却没有相关引用的贴图被加载\n\n所以是否是因为Unity打包时会自动把这些旧引用筛除？尽管在Editor上还是找得到这些冗余引用，是否可以不用理会？\n\n- 提问者：wenzhao\n- 提问时间：2021-05-21 04:49:52\n\n## 我的回答\n\n旧的Shader使用过的texture引用会被保留在序列化信息中，这是Unity有意的设计，为了避免编辑器下切换Shader再换回来时需要重新配置的麻烦。\n\n而Unity在**打包时确实会对材质进行深度检查，把当前Shader没有使用的texture依赖都去除**，因此通常情况下打包旧的引用也不会导致包体变大。\n\n但旧的引用在Editor下还存在一个问题，AssetDatabase.GetDependencies接口返回的引用会包括旧的引用，它不会进行深度检测来进行剔除。右键资源Select Dependencies调用的是这个接口，所以也会显示旧的引用，如下图：\n\n![image.png](assets/60a65af06bb31032f9791779/02.png)\n\npic2和pic3是当前Shader2没有引用的。\n\n![image.png](assets/60a65af06bb31032f9791779/03.png)\n\n所以使用GetDependencies这个接口实现一些功能的话，可能由于旧引用导致意外的问题。解决方法是，使用EditorUtility.CollectDependencies这个接口可以返回剔除旧引用的结果。\n\n此外，如果Mat和Pic1，Pic2，Pic3分配别单独打了一个AB包，那么打出的mat.manifest文件中会显示旧的Texture引用，这就是AssetBundle打包的一个不太合理的地方了，还没有调研新的Addressable系统是否做了改进。\n\n![image.png](assets/60a65af06bb31032f9791779/04.png)\n\n- 回答时间：2021-05-21 20:01:18\n- 最后更新：2021-05-21 20:01:18\n- 采纳状态：未采纳\n\n## 来源与关系\n\n- 上位集合：[[10-计算机、信息技术与工程/05-游戏图形与运行时/我的UWA问答/我的UWA问答|我的 UWA 问答]]\n- UWA 标签：Shader、资源管理、渲染模块\n- 原始问题：[Unity2018.4上材质对贴图的冗余引用是否可以不管？](https://answer.uwa4d.com/question/60a65af06bb31032f9791779)\n- 源页最后更新：2021-05-23 23:23:03\n"
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