| "Intelligent,green and efficient" are the three development trends of the construction industry at present.With the advent of the BIM information technology that is currently popular in the construction industry and the Internet,the three-dimensional model of building information based on the web has been included in the "14th Five-Year Plan" as the key technical direction of development.At present,this technology still suffers from problems such as poor compatibility of traditional modeling and visualization software platforms,poor processing capacity of large volume models,and relatively simple application functions,which limit the high-quality development and construction of new pattern of intelligent construction industry.Based on the research on the BIM model information visualization platform of bridge based on WebGL technology,it not only realizes the cross-platform visual display of the three-dimensional model of bridge,but also visually views the relevant information of the bridge model information,and connects the information with the back-end database,in order to achieve unified management of model data,which is crucial for the information development of bridge models,this paper aims to address the aforementioned issues and meet the demands of the analysis.The main content of this paper is as follows:(1)Implement the establishment of an existing bridge BIM model based on multisource point cloud data.Two complementary remote sensing technologies,3D laser scanning and oblique photogrammetry,are used to acquire target point cloud data.Point cloud registration is used to obtain high-precision point cloud data of the bridge and a refined realworld 3D model.Through accuracy comparison analysis,the feasibility of modern measurement technology for achieving digital modeling of existing buildings is demonstrated.Using the fused high-precision point cloud data,existing bridge ortho-image data,and real-world image data,a CAD drawing of the bridge with a real state is created,providing three-dimensional spatial data of the building for bridge maintenance and BIM modeling in the operation phase.Based on the point cloud data,an existing bridge 3D model is constructed using the BIM core modeling software Revit in reverse.(2)Data information extraction and webpage interaction of Revit bridge 3D model.Through the analysis of the data structure of the original model and the research of information storage,using Revit secondary development technology and C# programming language,the development of bridge BIM model information export plug-in is realized,exported to the web side can directly carry out data information transmission and efficient rendering of the three-dimensional model format.Finally,Web GL technology and three.js rendering engine are used to reconstruct the converted model on the webpage side,realize the three-dimensional model visualization based on Web GL and explore the basic operation of the model.(3)Design and develop Web-based bridge model information visualization platform construction.On the basis of the basic interaction of the existing visualization model,by analyzing the application requirements of bridge BIM model on the web side,a visualization platform of bridge BIM model information based on B/S architecture is designed and developed,and application function modules such as user management,model reconstruction and interaction,three-dimensional visualization of disease information and maintenance decision are realized in the platform.Finally,the actual engineering case is used to test the performance indicators of the model in the webpage side,verifying that the system has good compatibility,lightweight and other advantages,and meets the requirements of the information visualization management of bridge BIM model based on the webpage side. |
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