基于VR的管网三维自动建模研究

收稿日期:2018-12-02摇摇摇摇摇摇修回日期:2019-04-03摇摇摇摇摇摇网络出版时间:2019-06-26基金项目:国家重点研发计划(2017YFB0504100)作者简介:吴红燕(1991-),女,硕士,研究方向为三维建模与虚拟现实。网络出版地址:http://kns.cnki.net/kcms/detail/61.1450.TP.20190626.0833.040.html基于VR的管网三维自动建模研究吴红燕1,张学全2(1.武昌理工学院信息工程学院,湖北武汉430223;2.武汉大学资源与环境学院,湖北武汉430079)摘摇要:针对现有三维管网虚拟仿真系统中模型衔接效果较差和需要人工参与等问题,提出了一种基于VR的管网三维自动建模方法,能够快速构建大范围地下管网三维虚拟场景。首先对二维矢量管网数据进行数据采样和四叉树瓦片分割,将建模参数信息存储到对应的XML瓦片索引文件中。其次,根据场景漫游,动态加载管网瓦片建模信息进行快速三角构网和纹理贴图,实时构建三维管道和接头模型。最后依次遍历视野内的所有瓦片进行建模,构成大范围地下管网VR场景。在开源三维GIS平台WorldWind中进行了实验验证,结果表明该方法能够快速自动构建地下管网三维模型并流畅地实现大范围虚拟仿真。关键词:虚拟现实;地下管网;三维自动建模;四叉树瓦片;三角构网中图分类号:P302摇摇摇摇摇摇摇文献标识码:A摇摇摇摇摇摇文章编号:1673-629X(2019)10-0001-05doi:10.3969/j.issn.1673-629X.2019.10.001Researchof3DAutomaticPipeNetworkModelingBasedonVRWUHong-yan1,ZHANGXue-quan2(1.SchoolofInformationEngineering,WuchangUniversityofTechnology,Wuhan430223,China;2.SchoolofResourceandEnvironmentalSciences,WuhanUniversity,Wuhan430079,China)Abstract:Aimingattheproblemsofpoormodelconnectionandmanualparticipationintheexistingthree-dimensionalpipenetworksim鄄ulationsystem,weproposeaVR-based3Dautomaticmodelingmethodforpipenetwork,whichcanquicklybuildalarge-scaleundergroundpipenetwork3Dvirtualscene.Firstly,datasamplingandquad-treetilesegmentationarecarriedoutfor2Dvectorpipenetworkdata,andthemodelingparameterinformationisstoredinthecorrespondingXMLtileindexfile.Secondly,accordingtothesceneroaming,thetilesintheviewingextentisdynamicallyloadedandthepipenetworkmodelincludingpipeandjointmodelareauto鄄maticallyconstructedbymeshtriangulationandtexturemapping.Finally,allthetilesintheviewingextentaremodeledinturn,whichformsalarge-scale3DpipenetworkVRscene.Theexperimentalverificationiscarriedoutintheopensource3DGISplatformnamedWorldWind,whichshowsthatthemethodcanquicklyconstructthe3Dmodelofundergroundpipenetworkandsmoothlyrealizelarge-scale3Dscenesimulation.Keywords:virtualreality;undergroundpipenetwork;3Dautomaticmodeling;quad-treetile;meshconstruction0摇引摇言虚拟现实技术(virtualreality,VR)是近年来发展极为迅速的计算机技术,具有较强的三维沉浸感和交互性,对于现实仿真和场景