The Focus Point is the value used to tell the device where a user’s focus is. This defines a plane that is used to increase hologram quality for content that intersects the plane. Use the FocusPoint API to define this plane, to help stabilize the most important content currently in the user’s view. The FocusPoint API can be found in HolographicSettings.SetFocusPointForFrame.
有关 HoloLens 如何实现稳定全息图的更多信息，请参阅 Microsoft 关于全息图稳定性 (Hologram stability) 的文档。