There alwags exist limitations on computer capability. For real-time shared three dimensional systems, it is essential to find important tasks for users among all possible tasks to walk through and interact with 3D CG (Computer Graphics) spaces. Incorporating live videos, as components of virtual spaces, into 3D CG spaces is one of the heaviest tasks. In order to realize a real-time virtual space, we must use low quality representations for component objects in the space. LoD (Level of Datail) functions use the distance from a user's viewpoint to an object in a real-time virtual space to decide the quality of graphics representation of the object. The LoD is important to manage the QoS (Quality of Service) of live videos in real-time virtual spaces. PQoS (Partial QoS) as a generalized LoD will be presented for the QoS management of live videos in networked real-time virtual spaces.
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