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  "contentMarkdown": "# 关于mesh占用内存的问题\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在unity2020中能看见mesh中包含那些信息：\n\n![image.png](assets/6088d9dc6bb31032f979147e/01.png)\n\n（导入骨骼）\n\n这里如果不导入骨骼的话，顶点信息占用空间会减少一倍，请问导入骨骼后顶点信息增加了什么\n\n![image.png](assets/6088d9dc6bb31032f979147e/02.png)\n\n（未导入骨骼）\n\n然后是第二个问题，在导入骨骼的情况下内存中这个mesh占用了0.6m刚好差不多是上面inspector中显示的两倍，做过其他模型的测试也是两倍\n\n![image.png](assets/6088d9dc6bb31032f979147e/03.png)\n\n本来以为是开启read/write Enabled的问题，但是发现开不开起这个选项占用内存都不变。这个内存占用是怎么来的，开启read/write Enabled是否具体会造成两倍的内存开销\n\n- 提问者：正二八经\n- 提问时间：2021-04-28 19:43:24\n\n## 我的回答\n\n第一个问题：\n\nInspector面板的Vertices一栏指的是Mesh的顶点属性（或通道），如果该Mesh包含某个通道的数据，就意味着每个顶点都有一份该顶点属性。\n\n![image.png](assets/6088d9dc6bb31032f979147e/04.png)\n\n而Unity定义的顶点通道一共有14个：\n\n![image.png](assets/6088d9dc6bb31032f979147e/05.png)\n\n如果导入了骨骼，多出来的顶点属性是顶点的骨骼权重和骨骼索引。\n\n![image.png](assets/6088d9dc6bb31032f979147e/06.png)\n\n可通过Mesh.boneWeights()和Mesh.GetBonesPerVertex()访问。\n\n而一个BoneWeight属性存了4个float32和4个int32，一共8x4=32bytes。一个Bones index是一个byte。\n\n![image.png](assets/6088d9dc6bb31032f979147e/07.png)\n\n(8x4+1)byte/vert x 5512vert = 177.63KB\n\n###\n\n- 回答时间：2021-04-28 22:49:17\n- 最后更新：2021-04-28 23:03:56\n- 采纳状态：已采纳\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：资源管理\n- 原始问题：[关于mesh占用内存的问题](https://answer.uwa4d.com/question/6088d9dc6bb31032f979147e)\n- 源页最后更新：2021-11-20 22:28:02\n"
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