CN110990467B - BIM model format conversion method and conversion system - Google Patents

BIM model format conversion method and conversion system Download PDF

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CN110990467B
CN110990467B CN201911096069.8A CN201911096069A CN110990467B CN 110990467 B CN110990467 B CN 110990467B CN 201911096069 A CN201911096069 A CN 201911096069A CN 110990467 B CN110990467 B CN 110990467B
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model
bim
attribute information
model element
component attribute
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CN110990467A (en
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王同军
王万齐
乔立贤
王容容
秦琳
史瑞昌
解亚龙
卢文龙
刘伟
张敬涵
贺晓玲
刘延宏
王江
索宁
郭晓翠
于胜利
范志强
郭芳
徐晓磊
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China Academy of Railway Sciences Corp Ltd CARS
Institute of Computing Technologies of CARS
Beijing Jingwei Information Technology Co Ltd
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China Academy of Railway Sciences Corp Ltd CARS
Institute of Computing Technologies of CARS
Beijing Jingwei Information Technology Co Ltd
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    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/20Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
    • G06F16/25Integrating or interfacing systems involving database management systems
    • G06F16/258Data format conversion from or to a database
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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    • Y02P90/30Computing systems specially adapted for manufacturing

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Abstract

The invention provides a BIM model format conversion method and a conversion system, wherein the conversion method comprises the following steps: reading BIM models from different sources, and extracting component attribute information in the BIM models; judging the type of each model element in the BIM according to the component attribute information; according to the type of each model element, acquiring the geometric information of each model element in a corresponding analysis mode; the geometric information for each model element is stored in a custom format. The invention converts the data formats of BIM models of different sources in railway engineering into the unified format, and the converted data in the unified format can be applied to each railway engineering management BIM system, so that the collaborative visualization is high.

Description

BIM model format conversion method and conversion system
Technical Field
The invention belongs to the technical field of railway engineering, and particularly relates to a BIM (building information modeling) format conversion method and system.
Background
BIM (Building Information Modeling) is a digital expression with both physical property and functionality as a construction project, is a reliable shared information resource for making decisions in the whole life cycle of the construction project from the initial conceptual design, is also another important computer application technology for promoting the revolution of construction information after CAD, and promotes the transformation and innovation of industry concepts with great value advantages.
Along with the continuous acceleration of the construction scale and speed of railway infrastructure in China, BIM technology has become the main technical development direction of future railway engineering design construction. At present, large railway construction projects in China are actively advancing the application of BIM technology, and an engineering construction management system taking BIM as a core is sought to be established, so that the management mode of related engineering is optimized, and informatization, scientization and refinement of engineering management are realized.
Compared with civil building industry, the high-speed railway construction project has the characteristics of multiple professions, long lines, large volume, complex terrain and geological structure and the like, and the related BIM model is often various in format, huge in information volume and low in collaborative visualization degree, and is difficult to directly apply to a BIM system of an actual railway construction project.
Disclosure of Invention
In order to solve the problems of multiple sources and low collaborative visualization degree of the existing BIM model or at least partially solve the problems, the embodiment of the invention provides a BIM model format conversion method and a BIM model format conversion system.
According to a first aspect of an embodiment of the present invention, there is provided a BIM model format conversion method, including:
reading BIM models from different sources, and extracting component attribute information in the BIM models;
judging the type of each model element in the BIM according to the component attribute information;
according to the type of each model element, acquiring the geometric information of each model element in a corresponding analysis mode;
the geometric information for each model element is stored in a custom format.
The beneficial effects of the invention are as follows: the data in the data structure of the Cars model can be applied to a BIM system for managing related railway engineering, and the data structure of the Cars model also comprises a digital-analog separation mode, so that source model information is lightened, and a foundation is provided for improving the rendering efficiency of the BIM model.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the extracting component attribute information in the BIM model includes:
and extracting component attribute information in the BIM by adopting a mode corresponding to the model data organization structure according to different model data organization structures in the BIM.
Further, the extracting the component attribute information in the BIM model according to the different model data organization structures in the BIM model in a mode corresponding to the model data organization structures includes:
when a model structure tree exists in the BIM model, traversing each node in the model structure tree, extracting component attribute information in each node, and dynamically generating a global unique identifier GUID for each node;
correspondingly storing the component attribute information and the GUID into a database;
correspondingly, the obtaining the geometric information of each model element by adopting the corresponding parsing mode according to the type of each model element comprises the following steps:
and according to the type of each model element, analyzing by adopting a corresponding analysis mode to obtain the geometric information in each child node in the model structure tree.
Further, the extracting the component attribute information in the BIM model according to the different model data organization structures in the BIM model in a mode corresponding to the model data organization structures includes:
when the BIM does not have a model structure tree, reading each layer in the BIM, extracting component attribute information from each layer, and dynamically generating GUID for each layer;
correspondingly storing the component attribute information and the GUID into a database;
correspondingly, the obtaining the geometric information of each model element by adopting the corresponding parsing mode according to the type of each model element comprises the following steps:
and analyzing the geometric information contained in each layer by adopting a corresponding analysis mode according to the type of each model element.
Further, the obtaining the geometric information of each model element by adopting a corresponding parsing mode according to the type of each model element includes:
and according to the type of each model element, performing gridding treatment on each model element in a corresponding analysis mode to acquire the geometric information of each model element.
Further, the storing the geometric information of each model element in a custom format includes:
and storing the geometric information of each model element in a custom format by adopting a corresponding storage mode according to the type of each model element.
According to a second aspect of an embodiment of the present invention, there is provided a BIM model format conversion system, including:
the extraction module is used for reading BIM models from different sources and extracting component attribute information in the BIM models;
the judging module is used for judging the type of each model element in the BIM according to the component attribute information;
the analysis module is used for acquiring the geometric information of each model element in a corresponding analysis mode according to the type of each model element;
and the model storage module is used for storing the geometric information of each model element in a custom format.
According to a third aspect of embodiments of the present invention, there is also provided an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor invoking the program instructions to be able to perform the BIM model format conversion method provided by any of the various possible implementations of the first aspect.
According to a fourth aspect of embodiments of the present invention, there is also provided a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform a BIM model format conversion method provided by any of the various possible implementations of the first aspect.
The embodiment of the invention provides a BIM model format conversion method and a BIM model format conversion system.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a BIM model format conversion method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a BIM model format conversion method according to another embodiment of the present invention;
FIG. 3 is a block diagram illustrating a BIM model format conversion system according to one embodiment of the present invention;
FIG. 4 is a block diagram illustrating a BIM model format conversion system in accordance with another embodiment of the present invention;
FIG. 5 is a block diagram illustrating a BIM model format conversion system in accordance with another embodiment of the present invention;
fig. 6 is a schematic diagram of an overall structure of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
In one embodiment of the present invention, a BIM model format conversion method is provided, and FIG. 1 is a schematic overall flow chart of the BIM model format conversion method provided in the embodiment of the present invention, where the method includes: reading BIM models from different sources, and extracting component attribute information in the BIM models; judging the type of each model element in the BIM according to the component attribute information; according to the type of each model element, acquiring the geometric information of each model element in a corresponding analysis mode; the geometric information for each model element is stored in a custom format.
Compared with civil building industry, the high-speed railway construction project has the characteristics of multiple professions, long lines, large volume, complex terrain and geological structure and the like, and the related BIM model is often various in format, huge in information volume and low in collaborative visualization degree, and is difficult to directly apply to a BIM system of an actual railway construction project. Therefore, the embodiment of the invention provides a BIM model format conversion method which can convert BIM model data from various sources into a unified data format and can be applied to various BIM systems of railway engineering construction.
Specifically, BIM models from different sources are read, component attribute information in the BIM models is extracted for each read BIM model, and the type of each model element in the BIM model is judged according to the component attribute information. And then, according to the type of each model element, carrying out corresponding analysis on each model element to obtain the geometric information of the model element, and storing the geometric information of each model element in a custom general custom.
On the basis of the foregoing embodiments, in one embodiment of the present invention, the extracting component attribute information in the BIM model includes: and extracting component attribute information in the BIM by adopting a mode corresponding to the model data organization structure according to different model data organization structures in the BIM.
For BIM models of different sources, different model data organization structures may exist, namely, for different model elements, and different BIM models may be stored by adopting different model data organization structures, so that the embodiment of the invention extracts component attribute information in the BIM models in a corresponding mode aiming at the different model data organization structures in the BIM models.
In one embodiment of the present invention, the extracting the component attribute information in the BIM model according to the different model data organization structures in the BIM model in a manner corresponding to the model data organization structures includes: when a model structure tree exists in the BIM model, traversing each node in the model structure tree, extracting component attribute information from non-child nodes of the model structure tree, and dynamically generating a global unique identifier GUID for each node; and correspondingly storing the component attribute information and the GUID into a database.
Correspondingly, the obtaining the geometric information of each model element by adopting the corresponding parsing mode according to the type of each model element comprises the following steps: and according to the type of each model element, analyzing by adopting a corresponding analysis mode to obtain the geometric information in each child node in the model structure tree.
When a model structure tree does not exist in the BIM model, reading each layer in the BIM model, extracting component attribute information from each layer, and dynamically generating GUID for each layer; and correspondingly storing the component attribute information and the GUID into a database.
Correspondingly, the obtaining the geometric information of each model element by adopting the corresponding parsing mode according to the type of each model element comprises the following steps: and analyzing the geometric information in each layer by adopting a corresponding analysis mode according to the type of each model element.
At present, most of model data organization structures for storing data in BIM models are tree structures or layers, and different model data organization structures extract component attribute information in the model data organization structures in different modes. Referring to FIG. 2, when a model structure tree is present in the BIM model, each node of the model structure tree is traversed, specifically from the root node to the leaf nodes of the model structure tree. The method comprises the steps of storing attribute information in non-child nodes of a model structure tree, storing geometric information and attribute information in child nodes, and acquiring component attribute information stored in each node when traversing the nodes in the model structure tree. Wherein for each node of the model structure tree, a corresponding GUID (Globally Unique Identifie, globally unique identifier) is dynamically generated, and the component attribute information extracted from each node and the corresponding GUID are correspondingly stored in a database.
Judging the type of each model element according to the extracted component attribute information, and analyzing the geometric information of each model element from the model structure tree according to the type of each model element and the corresponding analysis mode.
And when the model structure tree does not exist in the BIM model, reading each layer in the BIM model, wherein each layer comprises component attribute information and geometric information. Component attribute information is extracted from each layer, GUIDs are dynamically generated for each layer, and the component attribute information extracted from each layer and the corresponding GUIDs are correspondingly stored in a database.
According to the type of each model element of the component attribute information extracted from each layer, according to the type of each model element, the geometric information of each model element is analyzed from each layer according to a corresponding analysis mode.
According to the embodiment of the invention, the attribute information and the corresponding GUID are correspondingly stored, and the three-dimensional BIM model and the attribute information can be mutually associated and stored separately through the GUID, so that the query is convenient.
In one embodiment of the present invention, the obtaining, according to the type of each model element, the geometric information of each model element by using a corresponding parsing method for each model element includes: and according to the type of each model element, performing gridding and other processing on each model element by adopting a corresponding analysis mode, and obtaining the geometric information of each model element.
The storing the geometric information of each model element into the Cars model data structure comprises the following steps: and according to the type of each model element, storing the geometric information of each model element into a Cars model data structure by adopting a corresponding storage mode.
Specifically, according to the attribute information extracted from the BIM model in the foregoing embodiment, the present embodiment determines, according to the attribute information, a type of each model element in the BIM model, for example, the model element is a point, a plane or a straight line, and analyzes each model element according to the type of each model element by adopting an analysis mode corresponding to the type of the model element to obtain geometric information of each model element, for example, when the model element is a point, analyzes the point by adopting an analysis mode corresponding to the point to obtain geometric information of the point; when the model element is a face, resolving the face by adopting a resolving mode corresponding to the face to obtain geometric information of the face; and similarly, when the model element is a line, analyzing the line by adopting an analysis mode corresponding to the line to obtain the geometric information of the line. When the model elements are points, planes or lines, the adopted corresponding analysis mode is the existing more mature mode. In the process of analyzing the model elements, each model element is gridded by adopting a corresponding analysis mode, and the geometric information of the model elements is obtained.
After each model element is analyzed to obtain the geometric information of each model element, the geometric information corresponding to each model element is stored in a self-defined Cars format in a corresponding storage mode according to the type of each model element.
In the Cars format, model elements in different formats in different BIM models are converted into the custom-defined Cars format, and the method can be applied to a related BIM system of railway engineering construction.
In the embodiment of the invention, the attribute information and the geometric information in the BIM are stored separately, the component attribute information is stored in a database, and the geometric information is stored in a custom-made Cars format, namely, the component attribute information and the geometric information are stored separately, namely, the data in the source BIM are subjected to light format conversion, so that the geometric information amount stored in the Cars format is smaller than the data amount of model elements stored in the original BIM, thereby facilitating visualization.
Dynamically generating a GUID for each node or layer in the source BIM model, and then storing information (attribute information and geometric information) contained under the node or layer and the GUID correspondingly so as to facilitate subsequent query according to the GUID; the geometric information of the model elements in the BIM obtained through analysis is stored in a Cars format in different storage modes according to the types of the model elements, and the geometric information of the model elements in different types is conveniently inquired.
In another embodiment of the present invention, a BIM model format conversion system is provided for implementing the method of the previous embodiments. Therefore, the descriptions and definitions in the embodiments of the BIM model format conversion method described above can be used for understanding the respective execution modules in the embodiments of the present invention. Fig. 3 is a schematic diagram of the overall structure of a BIM model format conversion system according to an embodiment of the present invention, where the conversion system includes an extraction module 21, a judgment module 22, an analysis module 23, and a model storage module 24.
The extracting module 21 is configured to read BIM models from different sources, and extract component attribute information in the BIM models.
And a judging module 22, configured to judge a type of each model element in the BIM model according to the component attribute information.
The parsing module 23 is configured to obtain geometric information of each model element in a corresponding parsing manner according to a type of each model element.
The model storage module 24 is configured to store the geometric information of each model element in a custom. Cards format.
Referring to fig. 4, a BIM model format conversion system according to another embodiment of the present invention is provided, which includes an extraction module 21, a judgment module 22, an analysis module 23, a model storage module 24, and a storage module 25.
The extracting module 21 is configured to read BIM models from different sources, and extract component attribute information in the BIM models.
And a judging module 22, configured to judge a type of each model element in the BIM model according to the component attribute information.
The parsing module 23 is configured to obtain geometric information of each model element in a corresponding parsing manner according to a type of each model element.
A model storage module 24 for storing geometric information for each model element in the carts model data structure.
And a storage module 24 for storing the component attribute information in a database.
Referring to fig. 5, wherein the extraction module 21 includes a first extraction unit 211 and a second extraction unit 212.
The extracting module 21 is specifically configured to extract the component attribute information in the BIM model in a manner corresponding to the model data organization structure according to different model data organization structures in the BIM model.
A first extraction unit 211, configured to traverse each node in the model structure tree when there is a model structure tree in the BIM model, extract component attribute information from non-child nodes of the model structure tree, and dynamically generate a globally unique identifier GUID for each node.
A second extracting unit 212, configured to, when a model structure tree does not exist in the BIM model, read each layer in the BIM model, extract component attribute information from each layer, and dynamically generate a GUID for each layer;
accordingly, the storage module 25 is configured to store the component attribute information extracted by the first extraction unit 211 and the second extraction unit 212 and the GUID in a database.
The parsing module 23 is specifically configured to perform gridding processing on each model element by adopting a corresponding parsing manner according to the type of each model element, so as to obtain geometric information of each model element.
The model storage module 24 is specifically configured to store the geometric information of each model element in the carts model data structure in a corresponding storage manner according to the type of each model element.
Fig. 6 is a schematic diagram of the overall structure of an electronic device according to an embodiment of the present invention, where the electronic device includes: at least one processor 01, at least one memory 02 and a bus 03; wherein, the liquid crystal display device comprises a liquid crystal display device,
the processor 01 and the memory 02 complete the communication with each other through the bus 03;
the memory 02 stores program instructions executable by the processor 01, and the processor invokes the program instructions to perform the methods provided in the above method embodiments, for example, including: reading BIM models from different sources, and extracting component attribute information in the BIM models; judging the type of each model element in the BIM according to the component attribute information; according to the type of each model element, acquiring the geometric information of each model element in a corresponding analysis mode; the geometric information for each model element is stored in a custom. Cars format.
The present embodiment provides a non-transitory computer readable storage medium storing computer instructions that cause a computer to perform the methods provided by the above-described method embodiments, for example, including: reading BIM models from different sources, and extracting component attribute information in the BIM models; judging the type of each model element in the BIM according to the component attribute information; according to the type of each model element, acquiring the geometric information of each model element in a corresponding analysis mode; the geometric information for each model element is stored in a custom. Cars format.
According to the BIM model format conversion method and the BIM model format conversion system, the data formats of BIM models from different sources in railway engineering construction are converted into the unified format, the converted data are uniformly stored in a Cars model data structure, and the data in the Cars model data structure can be applied to a related railway engineering management BIM system; the model elements in BIM models with different sources are correspondingly analyzed according to the types of the model elements, the geometric information of each model element is obtained through analysis, the geometric information is stored in a unified Cars model data structure according to a corresponding storage mode, and model elements with different formats in different BIM models are converted into a universal Cars model data structure, so that the BIM model data structure can be applied to a related BIM management system of railway engineering construction.
In the embodiment of the invention, the attribute information and the geometric information in the BIM are stored separately, the component attribute information is stored in a database, the geometric information is stored in a general Cars model data structure, and the component attribute information and the geometric information are stored separately, namely, the data in the source BIM is subjected to light format conversion, so that the geometric information amount stored in the Cars model data structure is smaller than the data amount of model elements stored in the original BIM, and the visualization is convenient.
Dynamically generating a GUID for each node or layer in the source BIM model, and then storing information (attribute information and geometric information) contained under the node or layer and the GUID correspondingly so as to facilitate subsequent query according to the GUID; in the Cars, the geometric information of model elements in different types of model elements is conveniently inquired.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware associated with program instructions, where the foregoing program may be stored in a computer readable storage medium, and when executed, the program performs steps including the above method embodiments; and the aforementioned storage medium includes: various media that can store program code, such as ROM, RAM, magnetic or optical disks.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. A BIM model format conversion method, comprising:
reading BIM models from different sources, and extracting component attribute information in the BIM models;
judging the type of each model element in the BIM according to the component attribute information;
according to the type of each model element, acquiring the geometric information of each model element in a corresponding analysis mode;
storing the geometric information of each model element in a custom format;
wherein, the extracting component attribute information in the BIM model includes:
extracting component attribute information in the BIM by adopting a mode corresponding to the model data organization structure according to different model data organization structures in the BIM;
the extracting component attribute information in the BIM model in a mode corresponding to the model data organization structure according to different model data organization structures in the BIM model comprises the following steps:
when a model structure tree does not exist in the BIM model, reading each layer in the BIM model, extracting component attribute information from each layer, and dynamically generating a global unique identifier GUID for each layer;
correspondingly storing the component attribute information and the GUID into a database;
correspondingly, the obtaining the geometric information of each model element by adopting the corresponding parsing mode according to the type of each model element comprises the following steps:
and analyzing the geometric information contained in each layer by adopting a corresponding analysis mode according to the type of each model element.
2. The BIM model format conversion method of claim 1, wherein the extracting the component attribute information in the BIM model in a manner corresponding to the model data organization structure according to different model data organization structures in the BIM model includes:
when a model structure tree exists in the BIM model, traversing each node in the model structure tree, extracting component attribute information in each node, and dynamically generating a global unique identifier GUID for each node;
correspondingly storing the component attribute information and the GUID into a database;
correspondingly, the obtaining the geometric information of each model element by adopting the corresponding parsing mode according to the type of each model element comprises the following steps:
and according to the type of each model element, analyzing by adopting a corresponding analysis mode to obtain the geometric information in each child node in the model structure tree.
3. The BIM model format conversion method of claim 1, wherein the obtaining the geometric information of each model element in a corresponding parsing manner according to the type of each model element includes:
and according to the type of each model element, performing gridding treatment on each model element in a corresponding analysis mode to acquire the geometric information of each model element.
4. The BIM model format conversion method of claim 1, wherein storing the geometric information of each model element in a custom format, in Cars, comprises:
and storing the geometric information of each model element in a custom format by adopting a corresponding storage mode according to the type of each model element.
5. A BIM model format conversion system, comprising:
the extraction module is used for reading BIM models from different sources and extracting component attribute information in the BIM models;
the judging module is used for judging the type of each model element in the BIM according to the component attribute information;
the analysis module is used for acquiring the geometric information of each model element in a corresponding analysis mode according to the type of each model element;
the model storage module is used for storing the geometric information of each model element in a custom format;
the extraction module is further used for extracting component attribute information in the BIM by adopting a mode corresponding to the model data organization structure according to different model data organization structures in the BIM;
the extraction module is further configured to, when a model structure tree does not exist in the BIM model, read each layer in the BIM model, extract component attribute information from each layer, and dynamically generate a globally unique identifier GUID for each layer; correspondingly storing the component attribute information and the GUID into a database;
the analyzing module is further configured to analyze, according to the type of each model element, by using a corresponding analyzing manner, to obtain geometric information contained in each layer.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor performs the steps of the BIM model format conversion method of any one of claims 1 to 4 when the program is executed.
7. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the BIM model format conversion method according to any one of claims 1 to 4.
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