| obj | 要设置为主要对象的对象。此对象必须已经使用 AddObjectToAsset 方法添加。 |
设置导入的主要对象。
使用此方法指定资源文件中的主要对象。
注意：
在调用此方法前，必须先使用 AddObjectToAsset 添加作为参数传递的对象。
如果不调用此方法，就会任意将一个通过 AddObjectToAsset 添加的对象提升为主要对象。
如果通过 AddObjectToAsset 添加了 GameObject 类型的对象，那么 SetMainObject 必须引用这些对象中的一个。传递不同类型的对象会导致所选对象被忽略，并任意提升一个 GameObject 作为主要对象。
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