Parallel algorithm for real-time contouring from grid DEM on modern GPUs

查看全文 作　　者：CHEN Zhuo,SHEN Lei,ZHAO YanQing & YANG ChongJun State Key Laboratory of Remote Sensing Science,Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University,Beijing 100101,China

出　　处：《Science China(Technological Sciences)》索引2010年第53卷第S1期,共5页

基　　金：supported by the National Hi-Tech Research and Development Program of China ('863' Project) (Grant Nos.2009AA12Z227,2009AA12Z215);the National Natural Science Foundation of China (Grant No.40801156) 摘　　要：A real-time algorithm for constructing contour maps from grid DEM data is pre-sented.It runs completely within the programmable 3D visualization pipeline.The interpolation is paralleled by rasterizer units in the graphics card,and contour line extraction is paralleled by pixel shader.During each frame of the rendering,we first make an elevation gradient map out of original terrain vertex data,then figure out the final contour lines with image-space processing,and directly blend the results on the original scene to obtain a final scene with contour map using alpha-blending.We implement this method in our global 3D-digitalearth system with Direct3D?9.0c API and tested on some consumer level PC platforms.For arbitrary scene with certain LOD level,the process takes less than 10 ms,giving topologically correct,anti-aliased contour lines. 关键词：CONTOUR map CONTOUR LINES paralleled computing 3D TERRAIN GPU digital earth

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Parallel algorithm for real-time contouring from grid DEM on modern GPUs

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