Yunshui ZhengThis email address is being protected from spambots. You need JavaScript enabled to view it. and Yingying Ding
School of Automation & Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Received: May 9, 2022 Accepted: September 15, 2022 Publication Date: October 25, 2022
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
Without affecting the application effect of BIM (Building Information Modeling) model, appropriate simplification of the model is a key step to promote BIM technology in the construction of engineering informatization. Aiming at the problems of large amount of model data, weak universality of data format and low network transmission efficiency, a research method for lightweight visualization application of signal BIM models based on glTF format andWebGL technology is presented. Firstly, the geometric spatial information and semantic attribute information required by the models are extracted through the idea of digital - analog separation, so as to realize the lightweight of the internal data of the models. Secondly, the QEM (Quadric Error Metrics) algorithm is used to simplify the external geometric triangles of the models and the Draco algorithm is used to compress and reduce the model file. On this basis, the geometric information and attribute information of the models are stored separately in the glTF file and MySQL database. Finally, the lightweight processed files are connected to the developed Three.js rendering engine to realize the development of visualization application based onWebGL technology. The research shows that this method realizes the data format conversion of the signal BIM models, and can effectively reduce the data volume of the model at the same time. In addition, the lightweight display and attribute information query of the models on the web pages are realized. It is beneficial to improve the application value of the signal BIM models in the digital development of railway signals.
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