Fusion method of building BIM model and live-action three-dimensional model

A technology of 3D model and fusion method, which is applied in image data processing, instrumentation, geometric CAD, etc., to achieve the effect of reliable data support

Active Publication Date: 2020-02-18
NANJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0005] However, there are still some deficiencies in the integration of BIM and real-world 3D models, which need further research, for example, how to preserve the semantic attributes in the original BIM model while fully expressing geometric figures, and how to unify the spaces of the two models in the same environment location, so that it presents an integrated display effect of inside and outside

Method used

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  • Fusion method of building BIM model and live-action three-dimensional model
  • Fusion method of building BIM model and live-action three-dimensional model
  • Fusion method of building BIM model and live-action three-dimensional model

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Embodiment 1

[0062] figure 1 It is a fusion framework of building BIM and real scene 3D model. In this framework, the IFC standard building BIM model needs to go through a series of conversion processes to form a new 3DTiles model of the building. The fusion and conversion process mainly includes the following four links :

[0063] (1) Refactor the model. The BIM model contains a wealth of building semantic information, such as walls, columns, beams, etc., and converting the building as a whole will result in the loss of building semantic information. Therefore, it is necessary to reconstruct the building BIM model first, and decompose an overall building BIM model into a set of BIM models of multiple subcomponents. The data format of each subcomponent model uses IFC files to store geometric and spatial information, such as beam 1.ifc, beam 2.ifc, column 1.ifc, etc., and the semantic attribute information corresponding to the subcomponent is stored in the attribute file with the same nam...

Embodiment 2

[0069] Based on the framework of the above-mentioned embodiment, a fusion method of a building information model (BIM) of the IFC standard and a real-scene 3D model of the 3DTiles standard is as follows: first, the building BIM model is split, and the json attribute file and the ifc geometry of each component are generated. file; then the intermediate format is exchanged, ifc is converted to obj; obj is converted to glTF, and the three-dimensional geometric figure data transmission is further realized; then the attributes and geometric data are connected, and glTF and json generate b3dm; finally add the data description file tileset.json, and b3dm Convert to 3DTiles data.

[0070] The specific operation steps are as follows:

[0071] Step 1: Building BIM model split

[0072] The purpose of this step is to split the BIM model in IFC format, including the establishment of data processing environment and model split.

[0073] 1) Data processing environment setup: Download BIM S...

Embodiment 3

[0122] Taking the buildings of Nanjing Architectural Design and Research Institute as a case, the model fusion method explored in this paper is verified. The DjiMatrice600 multi-rotor UAV is used, equipped with a five-lens tilt camera, and the equipment parameters are shown in Table 1. Field surveying and mapping was carried out on the building and its surrounding area of ​​about 2.6 hectares, and more than 1,300 aerial photos were obtained. The real-scene 3D modeling software Smart3DCapture was used to produce the experimental area model in 3DTlies format.

[0123] Table 1 UAV platform and equipped sensor parameters

[0124]

[0125] At the same time, the BIM model of the buildings of Nanjing Architectural Design and Research Institute was established with Revit software, which is three interconnected seven-storey buildings, such as Figure 7 shown. The BIM model contains 11 categories and 10533 components in total. In order to realize the integration of the two, first...

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Abstract

The invention discloses a fusion method of building BIM model and live-action three-dimensional model. The fusion and conversion process mainly comprises model reconstruction, geometric information conversion, model three-dimensional registration and semantic mapping. The fusion method comprises the steps that firstly, a building BIM model is split, and json attribute files and ifc geometric filesof all components are generated; then, intermediate format exchange is carried out, and ifc is converted into obj; obj is converted into glTF, and three-dimensional geometric figure data transmissionis further achieved; then attributes and geometric data are connected, and glTF and json generate b3dm; and finally, a data description file tileset.json are added, and the data description file tileset.json and b3dm are converted into 3DTiles data. According to the method, the semantic attribute characteristics in the BIM original model are reserved while the geometric figures are completely expressed, and the spatial positions of the two models are unified in the same environment, so that an internal and external integrated display effect is achieved.

Description

technical field [0001] The invention relates to a fusion method of a BIM model of a building and a three-dimensional model of a real scene, and belongs to the field of building information models. Background technique [0002] With the continuous acceleration of urbanization, the problems faced by cities are gradually increasing, and urban construction and management are facing severe challenges. In order to improve work efficiency, achieve cross-departmental collaboration and refined urban management services, urban informatization is imminent. Through the real-time integration of multi-source information and cross-domain information sharing, smart cities can provide good solutions to problems encountered in urban development, which is an important development trend of urban informatization. [0003] Smart city is developed from digital city and based on urban information model, of which building information model is an important part. Building Information Modeling (BIM, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T19/00G06F30/13
CPCG06T19/006
Inventor 徐敬海卜兰
Owner NANJING UNIV OF TECH
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