KR102356044B1 - Method of extracting and converting BIM data for Web Browser and VR/AR Application - Google Patents

Abstract

The present invention uses a single BIM data conversion engine to extract shape data in OBJ format, material and material data in MTL format, and attribute data in JSON format at once in a single process without loss or omission, so data conversion and The extraction operation is simplified, and work efficiency can be greatly improved. In addition, by classifying the BIM model by object type, it is possible to directly filter the BIM model by type of work in a web browser and virtual/augmented reality device. In addition, in the case of a large-capacity BIM model, it can be used in web browsers and virtual/augmented reality devices without data capacity problems by supporting the divided storage function. In addition, it is possible to reduce the data capacity by extracting only the main attribute information required for each object of the BIM model, and to check only the necessary attribute information in a web browser and virtual/augmented reality device. In addition, the material and material information of the BIM model is extracted at once without the use of a separate interlocking work and material tool, so that mapping work is unnecessary and work productivity can be improved.

Description

{Method of extracting and converting BIM data for Web Browser and VR/AR Application}

The present invention relates to a method of converting/extracting BIM data for use in web browsers and virtual/augmented reality devices, and more particularly, converts BIM data into a format that can be used in web browsers and virtual/augmented reality devices without data loss, It relates to a method of converting/extracting BIM data for the use of extractable web browsers and virtual/augmented reality devices.

In general, BIM (Building Information Modeling) is a digital model that expresses the shape and properties of a facility as information to integrate and utilize all information that occurs throughout the life cycle of a facility based on a three-dimensional information model.

In other words, BIM is a set of information representing a facility, and corresponds to one or several 3D model data created by a specific software. For example, Revit models, ArchiCAD models, etc.

Conventionally, when BIM data is to be used for virtual reality simulation in a virtual reality device, the BIM model is converted into an international standard BIM data neutral format (IFC) or Autodesk standard graphic exchange format (FBX) and exported. In this case, the properties and There is a problem in that material/material data is lost. Therefore, it is inconvenient to have to rework the mapping of missing materials/materials using a separate rendering tool (3ds Max, etc.).

BIM data is large-capacity data containing significant information based on object-based shape information and attribute information, and accordingly, the number of shapes that need to be rendered increases. For example, when exporting BIM data in IFC or FBX format, IFC and FBX files are plain text files that take up a very large capacity compared to the original file, so it is impossible to work beyond the physical free memory limit that can be used in web browsers and virtual/augmented reality devices.

In addition, BIM data consists of shape and attribute information of numerous 3D objects. In Autodesk Revit, all object properties are divided into properties that apply to each object and type properties that apply to the type of object. One object contains a lot of attribute information, and when it is extracted as it is, unnecessary attribute information is also extracted, and only the amount of data increases.

In addition, in the case of Autodesk Revit, which is mainly used as a BIM data creation tool, when a BIM model created using Autodesk Material Library is converted to IFC or FBX format and exported, there is a problem of missing material/material information due to data interoperability problem. Therefore, using a separate rendering tool (3ds Max, etc.), all materials/materials must be reassigned to Standard Material and the mapping work of matching the coordinate system must be performed once more.

Korean Patent Registration No. 10-1754294

An object of the present invention is to provide a BIM data conversion/extraction method for using a web browser and virtual/augmented reality device capable of converting/extracting 3D object information of BIM data without data loss.

BIM data conversion/extraction method for using a web browser and virtual/augmented reality device according to the present invention comprises the steps of: classifying objects of a BIM model by an object filtering module of a BIM data conversion engine; selecting, by the object filtering module, an object to convert/extract data; The shape lightening module of the BIM data conversion engine lightens the shape information about the selected object from the BIM data for the BIM model, converts it into shape data in OBJ format, and extracts it, and the material/material mapping module of the BIM data conversion engine From the BIM data, the material and material information for the lightweight object are converted into MTL format material/material data and extracted, and the property filtering module of the BIM data conversion engine attributes the lightweight object from the BIM data. and converting the information into attribute data in JSON format and extracting it.

The present invention uses a single BIM data conversion engine to extract shape data in OBJ format, material/material data in MTL format, and attribute data in JSON format at once in a single process without loss/omission, data conversion and The extraction operation is simplified, and work efficiency can be greatly improved.

In addition, by classifying the BIM model by object type, it is possible to directly filter the BIM model by type of work in a web browser and virtual/augmented reality device.

In addition, in the case of a large-capacity BIM model, it can be used in web browsers and virtual/augmented reality devices without data capacity problems by supporting the divided storage function.

In addition, it is possible to reduce the data capacity by extracting only the main attribute information required for each object of the BIM model, and to check only the necessary attribute information in a web browser and virtual/augmented reality device.

In addition, the material/material information of the BIM model is extracted at once without the use of separate interlocking work and material tools, so that mapping work is unnecessary and work productivity can be improved.

In addition, by extracting the ambient light (AMBIENT), diffuse reflection (DIFFUSE), and specular reflection (SPECULAR) values of the material, the surface and material of the object can be expressed more realistically in a web browser and virtual/augmented reality device.

1 is a diagram schematically showing the configuration of a BIM data conversion engine for using a web browser and virtual/augmented reality device according to an embodiment of the present invention.
2 is a flowchart schematically illustrating a BIM data conversion/extraction method for using a web browser and virtual/augmented reality device according to an embodiment of the present invention.
3 is a flowchart illustrating the data extraction step shown in FIG. 2 .
4 is a diagram illustrating an example of a user interface illustrating an object selection method according to an embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

The present invention is a method for converting and extracting BIM (Building Information Modeling) data into data in a format that can be utilized in virtual/augmented reality devices such as web browsers, tablet PCs, and smart glasses.

1 is a diagram schematically illustrating the configuration of a BIM data conversion engine for using a web browser and virtual/augmented reality device according to an embodiment of the present invention.

Referring to FIG. 1 , the BIM data conversion engine 10 for using a web browser and virtual/augmented reality device according to an embodiment of the present invention includes an object filtering module 11, a shape lightening module 12, and materials and materials. a mapping module 13 and an attribute filtering module 14 .

The object filtering module 11 classifies each object type from the BIM model.

The shape and weight reduction module 12 lightens the shape information of the object from the BIM data for the BIM model, converts it into shape data of the OBJ format, and extracts it.

The material and material mapping module 13 converts and extracts material and material information for the lightweight object from the BIM data into MTL format material and material data.

The attribute filtering module 14 converts and extracts attribute information on the lightweight object from the BIM data into attribute data in JSON format.

The BIM data conversion engine 10 may be developed based on Autodesk Revit among BIM data authoring tools.

A method of data conversion/extraction using the BIM data conversion engine configured as described above will be described as follows.

2 is a flowchart schematically illustrating a BIM data conversion/extraction method for using a web browser and virtual/augmented reality device according to an embodiment of the present invention.

Referring to FIG. 2 , the BIM data conversion/extraction method for using a virtual/augmented reality device according to an embodiment of the present invention includes a BIM model display step (S10), a work type classification step (S20), an object selection step (S30) and a data conversion/extraction step (S40).

The BIM model display step (S10) is a step in which the BIM data conversion engine retrieves the BIM model and displays it on the user interface screen.

Here, the BIM model is described as a Revit model as an example, and all data for the BIM model is also input from Revit as an example.

The work type classification step (S20) is a step in which the object filtering module 11 classifies the modeled objects into work types for future data utilization. The construction type is described as including construction, structure, construction/structure, and equipment, for example, but is not limited thereto and variously applicable. By filtering the BIM data by the type of work, it can be directly utilized in a web browser and virtual/augmented reality device.

The object selection step S30 is a step in which the object filtering module 11 selects an object of the BIM model to be converted/extracted.

In the object selection step (S30), the object filtering module 11 may select all objects of the current view, and it is also possible to filter only the objects selected by the operator.

Referring to FIG. 4 , when the operator selects each of the work types and objects of the BIM model and selects to extract displayed on the screen, the data conversion/extraction step S40 is performed.

3 is a flowchart illustrating the data conversion/extraction step shown in FIG. 2 .

Referring to FIG. 3 , the data conversion/extraction step S40 is a step of extracting shape data, material and material data, and attribute data for the selected object at once.

First, the shape lightweight module 12 reduces the weight of the selected object. (S41)

The shape lightweight module 12 reduces the vertices, edges, and faces of the mesh constituting the selected three-dimensional object to lighten the selected objects. By deleting overlapping vertices, sides, and faces of the object, the number of each is minimized to reduce weight.

The material and material mapping module 13 converts and extracts material and material information for the lightweight object into material and material data in a single MTL format (S42).

At this time, in order to prevent material and material damage of the BIM model due to loss of some data not supported by the standard format, the material and material mapping module converts the material and material library of the BIM model into a standard format, It converts and extracts materials and material data through automatic mapping operations such as grouping lightweight objects with the same material and removing duplicate materials.

The material and material data also include values of ambient light (AMBIENT), diffuse reflection (DIFFUSE), and specular reflection (SPECULAR) of the material.

On the other hand, the shape lightweight module 12, after reducing the shape information of the object, determines whether the file capacity of the shape data is less than a preset file size according to the web browser and virtual/augmented reality device. ( S43)

Here, the setting file capacity will be described as an example of about 150 MB.

When the file capacity of the shape data is less than the set file capacity, the shape lightweight module 12 converts the lightweight object into shape data in OBJ format and extracts it without division. (S44)

The attribute filtering module 14 converts the attribute data for the lightweight object into JSON format and extracts it without division. (S45)

On the other hand, when the file capacity of the shape data is greater than or equal to the set file capacity, the shape lightweight module 12 converts the lightweight object into shape data in OBJ format, but divides and extracts the shape data. ( S46)

When the shape data is divided and extracted, the attribute filtering module 14 converts the attribute data for the lightweight object into JSON format, but divides and extracts the attribute data. (S47)

When the attribute data is to be extracted by dividing the shape data in excess of the capacity of the shape data, the attribute data is also divided and extracted.

The BIM model is data containing all three-dimensional shape data related to the corresponding building and attribute information (standard, space, location, etc.) including detailed characteristics and contents.

The attribute filtering module 14 includes a list of attribute information that classifies necessary specific items among attribute information items for each object, and the attribute information includes object ID, work type classification, level, dimensions, and the like.

As described above, in the present invention, since the shape, material, material, and attribute data of BIM data can be converted and extracted into OBJ, MTL, and JSON formats, respectively, at a time in a single process, data conversion and extraction operations are simplified and work efficiency can be improved.

In addition, since it is possible to prevent data omission or loss during BIM data conversion and extraction, more accurate data can be used, and there is an advantage in that there is no need to use a separate tool to recover missing or lost data. .

Therefore, user convenience can be increased because BIM data can be efficiently utilized without loss or capacity limitation in other tools such as web browsers and virtual/augmented reality devices.

Although the present invention has been described with reference to the embodiment shown in the drawings, which is merely exemplary, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: BIM Data Transformation Engine 11: Object Filtering Module
12: Shape lightweight module 13: Material and material mapping module
14: Attribute Filtering Module

Claims (7)

A BIM model display step of calling the BIM data conversion engine and displaying the BIM model on the user interface screen;
a work type classification step in which the object filtering module of the BIM data conversion engine classifies the objects of the BIM model according to the work type including architecture, structure, and equipment;
an object selection step in which one of the object filtering module and the worker selects an object to be extracted by converting data from the BIM model and the type of work;
A data conversion/extraction step of extracting shape data, material and material data, and attribute data for the selected object,
The data conversion/extraction step is
The shape lightweight module of the BIM data conversion engine reduces the weight of the selected object from the BIM data for the BIM model,
Converting and extracting shape information about the lightweight object from the BIM data to shape data in OBJ format,
The material and material mapping module of the BIM data conversion engine converts and extracts material and material information for the lightweight object from the BIM data into material and material data in MTL format,
The attribute filtering module of the BIM data transformation engine converts and extracts attribute information on the lightweight object from the BIM data into attribute data in JSON format,
The shape and lightweight module,
Deleting overlapping vertices, edges, and faces from the mesh constituting the selected object to reduce weight,
When extracting the shape data for the lightweight object, if the file capacity of the shape data is less than the set file capacity set according to the web browser or virtual/augmented reality device, the shape data is extracted without dividing, and the set file capacity or more On the other hand, the shape data is divided and extracted,
The material and material mapping module,
When extracting material and material data for the lightweight object, the material and material library of the BIM model is converted to a standard format, and the lightweight object is grouped with the same material to remove duplicate materials. Then, convert and extract the material and material data for the lightweight object into a single MTL format,
The attribute filtering module,
When extracting attribute data for the lightweight object, BIM data conversion/extraction method for extracting only the attribute data for the work type and the lightweight object from the attribute table for each object included in the BIM data. delete delete delete delete delete delete

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