Research On Building Information Model Display System Based On WebGL

Informatization,industrialization and modernization are the three main directions of construction industry.With the "Internet plus" era,BIM has gradually become the most popular information technology of construction industry.The display technology of building information model based on the technology of 3D graphics platform has been specified as a key research area in "13th Five-Year" plan.At present,there are still outstanding problems in the application of this field,such as poor platform compatibility,strong dependence on imported software,and weak processing capability of large model.The use of scene scope of the building information information model is limited,which makes the value of the digital assets discounted.WebGL 3D visualization technology is increasingly mature and is supported by multi terminal browsers such as PC,Pad and mobile phone.WebGL based building information model display system is a popular theoretical research direction at the same time,and has great development value.This thesis aims at realizing the whole life cycle of building information,and combines IFC data standard and WebGL 3D visualization technology to carry out theoretical research and application development of the cross-platform building information model display system.The main research work of this thesis is as follows.(1)Research on multi-source heterogeneous data integration method of building information model based on IFC standard.First,the definition and characteristic analysis of multi-source heterogeneous data of building information model is analyzed,and the data integration method is proposed and solved.Then the IFC standard is analyzed comprehensively,and the description method of its geometric information is emphasized.(2)Research on lightweight data processing of building information model based on component geometric reuse algorithm.On the basis of the research on the standard data of IFC,the key problems in the process of data processing,such as information extraction,model transformation,data lightweight and data structure,are put forward and solved.(3)Research on cross platform building information model display technology.Through the research and analysis of the key problems such as the geometric model loading method,the scene visual space,the user interaction function and the cross platform compatibility,the datalightweighted building information model is realized.Based on the above theoretical research,a building information model display system named WebBIM is developed to achieve model display and user interaction.Through the experiment of a large number of actual project models,the system has the advantages of open data standard,cross platform and data light-weighted.It can meet the requirement of building information model of multi data source,multi platform and large scene.