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《Journal of Beijing University of Aeronautics and Astronautics》 2011-12
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Method of realtime hill-shading in digital earth system

Yang Hailin Wang Jiaxin (Department of Computer Science and Technology,Tsinghua University,Beijing 100084,China)  
Hill-shading terrain effects,which are high precision and real-time dynamic,were achieved on global terrain in the digital earth simulation system developed.It was realized by using the normal map mode without increasing the number of terrain grid.The elevation data was processed to level of detail chunked and create normal map of all levels by calculating normal.Lighting effects of normal map were calculated by pixel shader and the texture was pasted onto corresponding layered terrain meshes.By the direction of incidence of the light source's incidence direction,hue,saturation and brightness,the vertex's ambient light,diffuse light and specular light was calculated.At low-precision terrain grid,obvious changes effect of light and shadow as high-precision terrain grid was reached.
【CateGory Index】: TP391.41
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