Research On BIM Model Data Visualization Method Based On IFC And WebGL

The greatest value of Building Information Modeling(BIM)lies in the efficient collaboration between multiple parties and multiple disciplines.As the scale of buildings continues to increase and building information data becomes more complex,its model visualization and massive data Management has also become more and more difficult,so that it cannot meet the current BIM localized application requirements of engineering construction information data management,sharing and synchronization.In addition,the traditional visualization application system based on the C/S architecture is limited to independent systems,and the BIM server based on the B/S architecture is also limited by the 3D graphics acceleration technology.Although the 3D graphics display based on Web GL avoids these problems,it still There are problems such as low model transmission efficiency,poor rendering effects,and weak interaction performance.In order to solve the problems of poor model semantic integrity and weak data interoperability in the current Industrial Foundation Class(IFC)standard and Web GL framework integration scheme,this paper discusses from two aspects of model conversion and compression and scene optimization management,and studies the visualization of building information model data network Method of implementation.The main research work completed in this paper is as follows:(1)In view of the problem of slow network loading and rendering caused by the different model exchange standards and the limitation of traditional format analysis,through studying the model data structure and three-dimensional data structure,it is proposed to use the IFC standard file as the input source and gl TF as the model conversion target format,and Research model format conversion framework and data mapping mechanism.(2)Aiming at the problem of complicated model building components and improper management of information and data leading to long analysis loading time,by studying IFC data structure and BIM component types,a fusion of redundant vertex elimination and component matching algorithms are proposed to simplify the triangular mesh model components.Compress model data to achieve fast loading.(3)Aiming at the problem of low network rendering frame rate caused by limited model lightness and lack of scene data management,by studying the graphics rendering pipeline and scene organization methods,it is proposed to integrate the frustum culling and BS-AB collision detection algorithm to make the scene invisible Component is eliminated to optimize scene data,thereby improving rendering performance.This paper validates the model data compression and rendering scene management.The results show that this method can significantly reduce the redundant data of the BIM model,and can efficiently eliminate the invisible components of the complex scene,providing a feasible way for the visualization of the BIM model data network Reference program.