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In this paper, we present an approach for out-of-core dynamic streaming of a virtual scene. We use the traditional client/server architecture, where the main responsibility of the client application is visualization and interaction, and the main responsibility of the server is accepting and serving requests from the client application. The client will query geometry in the camera proximity to the server and the server will stream geometry (in CityGML format) to the client application. We implement the client application using Unity game engine. Performance comparison between traditional loading and our dynamic streaming are provided. We also show the scalability advantage of our work.