Railway BIM model lightweight method and system based on component instance merging

Abstract

The embodiment of the invention provides a railway BIM model lightweight method and system based on component instance merging. The method comprises the steps of obtaining a semantic information set in a BIM model, including basic attributes, an attribute set and an association relationship of each component in the BIM model, and combining repeated semantic information to obtain a simplified semantic information set; merging the geometric expressions associated with each component based on the simplified semantic information set, and identifying the components with the same geometric shape anddifferent positions according to the instance number to obtain a parameterized geometric expression model; converting the parameterized geometric expression model into basic geometric expression units such as points, lines and surfaces which can be directly displayed by a computer based on a component merging discrete algorithm; and obtaining a lightweight BIM model based on the basic geometric expression unit. According to the embodiment of the invention, the lightweight BIM model data is obtained based on component instance combination, the super-large data volume of the model is reduced, the bottleneck of the model in storage and transmission is solved, and the high efficiency is realized.

Description

technical field [0001] The invention relates to the technical field of BIM application, in particular to a railway BIM model lightweight method and system based on component instance merging. Background technique [0002] With the maturity of browser native calling technology of hardware acceleration resources of terminal devices, some web-based graphics engine programs use Web Graphics Library (Web Graphics Library, WebGL) technology to realize heterogeneous computer-aided design (Computer Aided Design, CAD) Model cross-platform web browser display. However, when using this method to render 3D graphics, it needs to consume a lot of terminal device resources. As the number of 3D model faces increases, the hardware resources consumed by rendering models will increase rapidly. When the size of the model exceeds the tolerance range of the user's terminal equipment, the program may freeze or crash. In Building Information Modeling (Building Information Modeling, BIM) applicat...

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Problems solved by technology

[0004] The embodiment of the present invention provides a railway BIM model lightweight method and system based on component instance merging to solve the problem that BIM cannot identify components with the same geometric shape in the prior art, and the amount of analytical data is large, which causes the transmission and display process burden and other issues

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