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Realistic rendering of virtual earth in real-time application
Wang Cheng, Dai Shuling*
School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� A new approach was proposed to enhance realism of virtual earth in VR-based real-time applications. A virtual earth which had 21 600×10 800 pixels surface texture, bumping surface and shine of atmosphere was constructed.The whole virtual earth was cut into 128 parts and then the position of vertices, normal vectors, texture coordinate were calculated by geometry. Using the techniques of the mixture of the textures of earth, normal and clouds, it achieved relatively vivid surface of the earth. By moving and scaling the board which had atmosphere texture, it showed the shine of atmosphere. To achieve good real-time, it eliminated the unvisible parts by judging the parts- visibility in real-time, and chose different resolutions of texture. Experiments show that this approach is able to run 45 frames per second with 1.02GB texture pixels.
Keywords�� virtual earth   real time system   virtual reality     
Received 2010-03-29;
Fund:

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Wang Cheng, Dai Shuling.Realistic rendering of virtual earth in real-time application[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2011,V37(8): 1034-1038
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