来自构建中的场景列表的场景索引号，用于必须出现在流式安装构建中的最后一个场景。
在编辑器中，Unity 在UWP 播放器设置中的打包下显示此内容。
为了使应用程序启动，Unity 要求设备上存在构建设置中所有场景，直到该索引为止。如果您的应用程序需要列表中的所有场景才能启动，请将此值设置为列表中最后一个场景的索引（scene_count - 1）。
一个场景只能使用具有更小索引值的另一个场景中的资源。这意味着流式安装中场景的排序很重要，因为它决定了 Unity 安装的顺序。您的应用程序无法将场景列表中较低位置（较大索引值）中的资源与列表中较高位置（较小索引值）中的场景共享。
注意：默认情况下，Unity 会禁用流式安装并忽略此值。将supportStreamingInstall设置为`true`或选中播放器设置中的流式安装选项以启用此功能。
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