一种新的三维场景数据渲染方法  

A new implementation for rendering of three-dimensional scene data

作　　者：于雷易 邴丕敬 杨永明 YU Leiyi;BING Pijing;YANG Yongming(Applied Technology R&D Division of Technology Innovation Center for Territorial&Spatial Big Data,MNR,Beijing 100034,China;Teleware Info&Tech Co.,Ltd.,Fuzhou 350001,China;Graduate School of Renmin University of China,Beijing 100872,China;School of Labor and Human Resources,Renmin University of China,Beijing 100872,China)

机构地区：[1]自然资源部国土空间大数据工程技术创新中心应用技术研发分中心,北京100034 [2]特力惠信息科技股份有限公司,福州350001 [3]中国人民大学研究生院,北京100872 [4]中国人民大学劳动人事学院,北京100872

出　　处：《自然资源信息化》2022年第5期39-45,共7页Natural Resources Informatization

基　　金：中央引导地方科技发展专项“国土空间三维时空数据可视化与分布式存储关键技术研究”(2021L3033)。

摘　　要：本文基于Cesium技术和osg Earth技术研发了面向三维场景数据的客户端与服务端混合渲染方法。该方法包括分层细节级别(hierarchical level of detail,HLOD)层级瓦片筛选规则、三级缓存策略、多用户并发与分布式渲染任务分配等关键技术,既能减少客户端的数据压力和资源压力,又能通过服务端的渲染集群提高三维场景的显示效率。本文在混合渲染方法基础上,设计和实现了远程地理信息系统(Tele-geographic information system,TeleGIS)三维大数据万维网(Web)显示系统。实验证明,该系统能够完成海量、高密度、高精度三维场景数据的在线可视化任务,可视化性能和数据量可扩展性达到设计目标,在当前同类技术中具有较大优势。Based on Cesium and osgEarth technology, this paper develops a mixed rendering method using client-side rendering and server-side rendering for three-dimensional scene big data. This method consists of three key technologies,including sifting regulation of Hierarchical Level Of Detail(HLOD) tiles, strategy of three-level cache, multiple-access concurrent and allocation of distributed parallel rendering tasks. This method can not only reduce the data pressure and resource pressure on client side, but also promote displaying efficiency of three-dimensional scene by rendering cluster on server side. Based on the mixed rendering method, this paper fulfills the design and implementation of Tele-Geographic Information System(TeleGIS) web displaying system for three-dimensional big data. The experimental results prove that web visualizing for massive, highly dense and highly precise three-dimensional scene data can be achieved. And the visualizing performance and extensibility of data amount of this system meet the design objective. The mixed rendering method has major advantages comparing to current similar technologies.

关 键 词：TeleGIS 三维大数据 HLOD 分布式并行渲染 三级缓存 

分 类 号：P208[天文地球—地图制图学与地理信息工程]