| With the gradual development of the Internet era,BIM,as an advanced new concept and new technology in the construction industry,is indispensable in the process of historical building protection.With the development of 3D technology and the increasing demand of visualization technology,it is necessary to enhance the sensory experience,and the enhancement of mutual inductance in the process of visualization becomes more and more important.At present,most of the 3D visualization systems used at this stage stay in the stage of using C/S architecture mode.They need to use mobile phones to download the corresponding mobile client PC.when using the client,they need to establish a 3D visualization database through the client connection,and display the data on the client to achieve the effect of 3D visualization.However,there are some problems in the client-side3 D visualization system,such as large memory occupied by the client,high requirements for the client’s computer configuration,poor code openness and poor portability.The 3D visualization model used in this scheme has been unable to meet the needs of current customers.Taking Guangxi Provincial Museum of art as an example,the fine design of 3D model of art museum is carried out by Revit.The secondary development of Revit is carried out with C++ language.The BIM visual early warning system of art museum is established based on HTML 5 and Java Web terminal.The specific research contents are as follows:(1)The system is based on the development technology of Java language,with the more flexible development mode of My SQL database,accelerating the rendering of BIM model of art museum through graphic hardware,which improves the browser’s access speed by 0.55 times,and realizes the conversion of file format from RVT to JSON.At the same time,it uses web to develop building model data,and saves model attributes and geometric information in JSON format intermediate file Then,with the help of webgl technology,rendering and reconstruction operations are carried out to meet the needs of visualization.(2)Using webgl and three-dimensional GPU rendering principle to complete the development of the three-dimensional building model of Revit Three.js The framework enables the BIM model of art museum to realize the information interaction on the web.At the same time,the attributes in the JSON model file are associated with the geometric data,so that the browser-side model can have the function of display and query.(3)In the process of Web visualization of BIM model,by converting RVT file into JSON format file,the file size can be reduced by more than 90% to achieve the purpose of lightweight.Combined with the interaction of 3D model data,arbitrary click on the sensor on the model,and the monitoring information is displayed on the web interface in real time,which makes it more convenient and intuitive to monitor the interior of the art museum,and realizes the combination of BIM model and monitoring system of Art Museum.(4)Through the stress analysis of the structure of the art gallery,the dangerous section is determined as the monitoring point.The fiber Bragg grating inclinometer,strain gauge and level gauge are selected to monitor the inclination,strain and deflection at the corresponding positions,and transmit them to BIM webpage.When the monitoring data exceeds the threshold value set by the system,the BIM model of art gallery on the web will give an alarm prompt in different colors,which is convenient for finding abnormal components and repairing them manually and finally achieving the purpose of monitoring and protection.Based on the above work,this paper transforms the traditional C/S architecture into B/S architecture on the basis of the built BIM visualization platform for historical buildings,which enhances the visual browsing effect of 3D models on the web side,and combines BIM model with real-time monitoring system to develop a BIM visualization early warning system for historical buildings based on Web. |
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