考虑几何特征的BIM模型轻量化方法研究  

BIM simplification method considering geometric characteristics

作　　者：陈科 张力 管林杰 严亚敏[2] 李伟哲[2] CHEN Ke;ZHANG Li;GUAN Linjie;YAN Yamin;LI Weizhe(Changjiang Spatial Information Technology Engineering Co.,Ltd.(Wuhan),Wuhan 430010,China;Shannxi Province Institute of Water Resource and Electric Power Investigation and Design,Xi′an 710001,China)

机构地区：[1]长江空间信息技术工程有限公司(武汉),湖北武汉430010 [2]陕西省水利电力勘测设计研究院,陕西西安710001

出　　处：《人民长江》2022年第2期209-213,共5页Yangtze River

基　　金：陕西省水利厅科技计划项目(2013slkj-28)。

摘　　要：针对现有BIM模型几何图形化简的不足,设计了一种考虑BIM模型几何特征的轻量化化简方法。首先获取BIM模型体的表面几何数据,然后根据BIM模型某一格网的顶点个数判断其是否为三角面片。当多边形为三角面时,对其进行三角面片合并化简,接着对合并后的多边形采用三点法进行边界线化简。根据短边原则,将多边形边界线化简后删除的点移至相邻边中短边的另一顶点处。最后,根据获取的材质信息,对化简后的模型赋予对应的材质属性。针对一建筑实例的应用表明:该化简方法能够快速实现对BIM模型几何数据的三角面片和边界的化简,并通过对合并后面形状的判断,保留BIM模型原有几何图形特征。A simplification method considering geometric characteristics of BIM model is designed aiming at deficiency of traditional geometric simplification in BIM models.The proposed method gets the surface geometry data of BIM model firstly,and judge whether it is a triangular patch according to the number of vertices of a grid in BIM model.When the polygon is triangular,it is simplified by merging triangular patches,and the boundary line of the merged polygon is simplified by three-point method.According to the principle of short edge,the vertex of the adjacent polygon is moved to the opposite edge.The simplified model is given the corresponding material attributes based on the grid division according to the obtained material information.The proposed method can quickly simplify the triangular patches and boundaries of BIM model geometric data,and retain the advantages of original geometric features of BIM model by judging the shape after merging.

关 键 词：BIM 三角面片 几何特征 BIM模型 轻量化 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]