三维CSG-BRep拓扑模型的研究

摘要

Currently ordinary triangular mesh model based on discrete point cloud has a large amount of data.This model is not only difficult to split, but also lacks of topological relations.To solve these problems, this paper presents a CSG-BRep topological model.It can record topological relationship of 3D model in great detail.Finally, LIDAR point cloud is used as a data source to construct 3D CSG-BRep topological model.Compared with the ordinary triangular mesh model, the model components can be split, which can effectively reduce the amount of data.In addition, the CSG-BRep model has the detailed topological relations.%针对目前通过离散点云来构建的三角网模型具有数据量大,难以拆分,没有拓扑关系等缺点,提出一种特殊的CSG-BRep模型数据结构,该数据结构可以全面细致地记录模型内部的拓扑关系.利用激光雷达点云作为模型的数据来源,结合文中提出的数据结构,构建三维精细CSG-BRep拓扑模型.该模型与普通三角网模型相比,各个构件可以拆分,所占用内存较少,并具备更完善的拓扑关系.