| 集群环境下基于视点移动的三维城市模型快速显示方法 |
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| 引用本文： | 李朝奎,方军,方文,卜璞.集群环境下基于视点移动的三维城市模型快速显示方法[J].测绘通报,2017,0(10):74-78. |
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| 作者姓名： | 李朝奎 方军 方文 卜璞 |
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| 作者单位： | 1. 湖南科技大学地理空间信息技术国家地方联合工程实验室, 湖南 湘潭 411201;2. 湖南科技大学地理空间信息湖南省工程实验室, 湖南 湘潭 411201 |
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| 基金项目： | 国家自然科学基金，湖南省研究生创新基金，湖南省重点实验室开放基金项目，湖南省教育厅重点项目 |
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| 摘 要： | 大范围三维城市模型数据在现有的单机运行环境下，因数据量大导致运行速度慢、计算耗时等难题。为解决该问题，本文结合集群并行运算，提出了一种基于视点移动规则的大范围三维城市模型的快速显示方法。采用静态细节层次简化算法将三维城市模型简化为4个分辨率层次，根据视点移动规律，利用距离和偏心率选择不同层次的细节层次模型，逐级加载不同分辨率层次模型，并在集群系统中并行显示，从而有效地解决了大范围三维城市模型加载显示过慢、场景效果跳跃等问题，实现了对大范围三维城市模型的快速可视化。试验结果表明：随视点变化分层逐级加载不同等级LOD模型，采用PC集群并行绘制，可以快速有效地对大范围三维城市模型进行渲染处理，在兼顾效率的同时，并行地显示模型的细节，具有良好的可视化效果，对智慧城市的建设具有重要的指导意义。
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| 关 键 词： | 集群环境 视点移动 三维城市模型 快速显示 |
| 收稿时间： | 2017-02-17 |
The Fast Display Method for 3DCM Based on the Viewpoint Moving in Cluster Environment |
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| LI Chaokui,FANG Jun,FANG Wen,BU Pu.The Fast Display Method for 3DCM Based on the Viewpoint Moving in Cluster Environment[J].Bulletin of Surveying and Mapping,2017,0(10):74-78. |
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| Authors: | LI Chaokui FANG Jun FANG Wen BU Pu |
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| Institution: | 1. National-local Joint Engineering Laboratory of Geo-spatial Information Technology, Hunan University of Science and Technology, Xiangtan 411201, China;2. Hunan Province Engineering Laboratory of Geospatial Information, Hunan University of Science and Technology, Xiangtan 411201, China |
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| Abstract: | With the rapid development of digital city construction, as the core content of digital city,3DCM has the characteristics of large amount of data, slow running speed, great calculation pressure and so on in the existing computer's running environment.To solve these problems, combined with the parallel computing, a new fast display method for 3DCM based on the viewpoint move rules is proposed.Using static LOD simplification algorithm to simplify the 3DCM to four resolution level.Based on the viewpoint move rules, the LOD model was selected and gradual loading according to the distance and the eccentricity ratio.The results were parallel displaying in the cluster system, which effectively solves the problems of slow load display and scene jumping for large-scale 3DCM,achieved the fast display of large scale 3DCM. Experimental results show that this method can quickly and effectively deal with large-scale 3DCM rendering, while taking into account the efficiency and showing the details of the model, has a good visual effect, which has important significance for the development of digital city. |
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| Keywords: | cluster environment viewpoint moving 3DCM fast display |
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