Real-time Realistic Rendering In Virtual Environment Based On Dynamic Storing And Scheduling

Along with the development of computing technology, virtual reality (VR) and computer network have now become the two key techniques that can have great effect on the future information society. One of the objectives of VR is to construct a full-immersive interactive environment. The main research work of this thesis focuses on two aspects of the VR technique: realism, and real-time performance in scene rendering, which are both the key issues for a successful VR system. Up to now, it is still a contradiction for the two sides in complex virtual environment, especially when realistic information is required to follow the change of view position and direction. How to design efficient rendering algorithms to balance one side with another is a challenging problem.Under the background of a national key technological project on information conservation and reproduction of cultural relics in danger, this thesis discusses some key methods on maintaining real-time performance while enhancing the quality and reality of a complex virtual environment. It includes five parts as follow:1. The basic concepts and previous work of the foresaid scope are summarized, among which, the state of the art in some key issues are thoroughly surveyed.2. Strategies for dynamic storing and scheduling in complex realistic scenes are researched, and for a mass texture scene, an accelerated rendering framework is proposed. In this framework, the scene graph is optimized at first. Then, based on a 3-tier cache hierarchy for scene-data, a set of algorithms are arranged, such as visibility detection, level-of-detail reckoning, and dead reckoning, etc., to conduct cache scheduling and pre-scheduling strategies. By this means, the final rendering is accelerated, and the balance of realism and real-time performance is maintained.3. For acquiring photorealism in real time, an approximate method is introduced to...