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  "title": "资源导入后处理&动画文件优化",
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  "contentMarkdown": "# 资源导入后处理&动画文件优化\n\n> 创建时间：2020/7/16 22:08\n\n**标签：**|  _优化_\n\n## 资源导入的过程\n\n当Unity检测到Assets目录当中的资源文件发生变化时，会根据资源的类型调用相应的Importer对资源进行导入。导入之前的文件，Unity其实是无法操作的。导入之后，会把资源放到Library文件夹中，Unity编辑器中进行操作的、Build导出的、打包成AssetBundle的文件，也就是Library当中的文件。在编辑器外移动文件或者Reimport文件，都会对资源进行重新import。\n\nAssetPostPossessor会在资源导入后对进行处理，每次Import资源之后，都会调用OnPostprocessModel函数。\n\n## 对动画资源进行优化\n\n为了减小动画文件的精度，写了个脚本继承AssetPostPossessor，重写OnPostprocessModel函数，在每次Import动画文件之后，把动画里的scale曲线去掉，curve的浮点数精度降低，可以优化动画文件所占用的资源。\n\n```csharp\nstring s1 = "Hello ";\nstring s2 = s1;\ns1 += "World";\n\nSystem.Console.WriteLine(s2);\n//Output: Hello\n\n```\n\n该后处理的函数，只影响导入到Library文件夹中的资源，而不会影响Assets文件夹下的资源（如fbx文件），因此，如果资源重新导入（在编辑器外移动位置、Reimport）时，该脚本不在项目当中，那么之前所做的优化就会失效。\n在刚刚把该脚本放入项目中时，一定要Reimport资源，优化才会生效。\n\n而对项目进行Build和AB打包时，使用的资源就是Library中的资源，打成的包是否优化，取决于Library中的资源是否\n"
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