可用于确定 XR 设备是否处于活动状态的只读值。
值为 true 时，Unity 将接受设备的输入并尝试渲染到设备的显示器。请注意，即使由于用户不存在而导致设备当前未渲染，此属性也会返回 true（请参阅 XRDevice.userPresence）。如果设备断开连接、无法初始化（请参阅 XRSettings.LoadDeviceByName）或 XRSettings.enabled 设置为 false，该值可能会变为 false。
XR 输出将自动镜像到主显示器（如果适用）。这可以通过 XRSettings.showDeviceView 进行控制。
主窗口仍然由 Screen 和相关 API 控制。
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