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  "contentMarkdown": "# 关于Legacy动画压缩精度到3位后Unity在Rotaiton曲线中产生自动补帧的问题\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[如何降低动画文件的浮点数精度](https://answer.uwa4d.com/question/593955b6c42dc04f4d8f7341)\n\n在对Legacy动画采用上述方法进行压缩后，发现使用下面两种插值方式的Rotaion动画都被自动填充了中间的帧\n\n![image.png](assets/608ceb6c6bb31032f97914bd/01.png)\n\n压缩前：\n\n![image.png](assets/608ceb6c6bb31032f97914bd/02.png)\n\n压缩后：\n\n![image.png](assets/608ceb6c6bb31032f97914bd/03.png)\n\n请问大家知道产生的原因吗 谢谢各位\n\n- 提问者：Tiki\n- 提问时间：2021-05-01 21:47:24\n\n## 我的回答\n\n造成 “填充中间帧” 的问题的原因是Unity对插值的处理，与降低精度的算法没有关系。可以尝试：单纯GetEditorCurve，然后SetEditorCure，不进行修改，依然会存在题主说的“填充中间帧”的问题。\n\n![image.png](assets/608ceb6c6bb31032f97914bd/04.png)\n\n要理解这个问题的原因，需要理解Unity对Rotation的处理方式。Rotation在Unity内部都是用Quaternion处理的，即使动画资源与内存中存储的是欧拉角(Eular)。官方的说法：“Unity has to convert rotation values to Quaternions eventually, since the engine only works with Quaternions.”\n\n而AnimationClip的插值方式的三个选项，实质上是如下含义：\n\n- Eular Angles - 欧拉角插值，AnimationClip资源中存的是欧拉角，运行时插值后转为四元数\n- Quaternion - 四元数插值，AnimationClip中存四元数，运行时插值\n- Eular Angles(Quaternion) - 欧拉角插值，并把插值后的角度值烘焙(Bake)成Quaternion，存到资源文件中\n\n使用Eular Angles(Quaternion) 的方式，可以在AnimationClip文件中看到曲线的字段如下：localEulerAnglesBaked\n\n![image.png](assets/608ceb6c6bb31032f97914bd/05.png)\n\n这种情况，资源本身占用的内存会增大：\n\n![image.png](assets/608ceb6c6bb31032f97914bd/06.png)\n\n这就是使用Eular Angles(Quaternion)方式插值，中间的帧都出现的原因，引擎把插值结果烘焙到了资源中。而GetEditorCurve和SetEditorCurve后在能看到插值的效果，只是因为Get/Set之后，Unity把数据显示到了引擎当中。\n\n参考：\n\nhttps://docs.unity3d.com/Manual/animeditor-AnimationCurves.html\n\nhttps://docs.unity3d.com/Manual/AnimationEulerCurveImport.html\n\n- 回答时间：2021-05-02 08:45:20\n- 最后更新：2021-05-02 10:01:45\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Legacy动画压缩精度到3位后Unity在Rotaiton曲线中产生自动补帧的问题](https://answer.uwa4d.com/question/608ceb6c6bb31032f97914bd)\n- 源页最后更新：2021-05-03 01:05:00\n"
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