KR102446398B1 - System and method for simplifying building shape of building information model - Google Patents

Abstract

A building shape simplification system and method of a building information model are disclosed. a BIM database in which a building information model (BIM) is stored; a BIM reading module for reading a building information model from the building information model stored in the BIM database; an original shape extraction module for extracting an original shape from the building information model read by the BIM reading module; A simplified shape acquisition module for acquiring a simplified shape from the building information model read by the BIM reading module is configured. According to the building information model building shape simplification system and method described above, the three-dimensional shape model of the building is configured to simplify the three-dimensional shape according to a predetermined algorithm by classifying the main surface, the opening surface, etc. from the original shape of the building information model. It has the effect of objectively simplifying the simplification and increasing the efficiency of the simplification work.

Description

SYSTEM AND METHOD FOR SIMPLIFYING BUILDING SHAPE OF BUILDING INFORMATION MODEL

The present invention relates to a building information model, and more particularly, to a system and method for simplifying a building shape of a building information model.

Building information modeling (BIM) is a method of modeling a specific building or space. It can store spatial information including 3D shape information, and can be used in the fields of design, environmental evaluation, and operation of buildings.

Various simulations including computational fluid dynamics are being used for designing a building or evaluating the environment of an existing building. For simulation, a three-dimensional shape model of the target building is required, and for this purpose, shape information extracted from building information modeling can be utilized.

However, a certain level of simplification is required when designing a simulation model because a model including the details and complex shape of the 3D shape model causes numerical analysis errors and computational load.

However, the manual simplification process using the existing CAD or CAM not only consumes a lot of manpower and time, but also has a problem that non-objective shape deformation and mistakes may occur.

Accordingly, an algorithm that simplifies a model according to a constant and objective criterion is required.

Registered Patent Publication No. 10-1741015 Registered Patent Publication 10-1465483

An object of the present invention is to provide a building shape simplification system of a building information model.

Another object of the present invention is to provide a method of simplifying a building shape of a building information model.

The building shape simplification system of the building information model according to the object of the present invention described above includes a BIM database in which a building information model (BIM) is stored; a BIM reading module for reading a building information model from the building information model stored in the BIM database; It may be configured to include an original shape extraction module for extracting an original shape from the building information model read by the BIM reading module.

And it may be configured to further include a simplified shape acquisition module for acquiring a simplified shape from the building information model read by the BIM reading module.

A method of simplifying a building shape of a building information model according to another object of the present invention described above includes: reading, by a BIM reading module, a building information model from a building information model stored in advance in a BIM database; The original shape extraction module may be configured to include extracting the original shape from the building information model read by the BIM reading module.

And the simplified shape acquisition module may be configured to further include the step of acquiring the simplified shape from the building information model read by the BIM reading module.

According to the building information model building shape simplification system and method described above, the three-dimensional shape model of the building is configured to simplify the three-dimensional shape according to a predetermined algorithm by classifying the main surface, the opening surface, etc. from the original shape of the building information model. It has the effect of objectively simplifying the simplification and increasing the efficiency of the simplification work.

That is, regardless of the characteristics of the target building or the skill level of the analyst, there is an advantage that the result of shape simplification can always be seen.

1 is a schematic diagram of a building shape simplification process of a building information model according to an embodiment of the present invention.
2 is a block diagram of a building shape simplification system of a building information model according to an embodiment of the present invention.
3 is a schematic diagram of an original shape extraction process according to an embodiment of the present invention.
4 is an exemplary diagram of a surface classification process according to an embodiment of the present invention.
5 is an exemplary diagram of a basal stereoscopic segmentation process according to an embodiment of the present invention.
6 is an exemplary diagram of a segmented base stereoscopic selection process according to an embodiment of the present invention.
7 is a flowchart of a method of simplifying a building shape of a building information model according to an embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed content for carrying out the invention. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements.

Terms such as first, second, A, and B may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a building shape simplification process of a building information model according to an embodiment of the present invention, and FIG. 2 is a block diagram of a building shape simplification system of a building information model according to an embodiment of the present invention. And Fig. 3 is a schematic diagram of an original shape extraction process according to an embodiment of the present invention, Fig. 4 is an exemplary view of a surface classification process according to an embodiment of the present invention, and Fig. 5 is an embodiment of the present invention It is an exemplary diagram of a base stereoscopic segmentation process, and FIG. 6 is an exemplary diagram of a segmented base stereoscopic selection process according to an embodiment of the present invention.

Referring to FIG. 1 , the building shape simplification process of the building information model according to the present invention is broadly viewed as the process of extracting the original shape from the BIM model, preprocessing the three-dimensional shape from the original shape, classifying the surface of the three-dimensional shape, generating a polyhedron, and simplifying the shape is composed of

2, the building shape simplification system 100 of the building information model according to an embodiment of the present invention includes a BIM database 110, a BIM reading module 120, an original shape extraction module 130, and a pre-processing module ( 140 ), a three-dimensional surface classification module 150 , a polyhedron generating module 160 , and a simplified shape obtaining module 170 .

Hereinafter, a detailed configuration will be described.

The BIM database 110 may be configured to store a building information model (BIM). The building information model includes design information of the target building.

The BIM reading module 120 may be configured to read the building information model from the building information model stored in the BIM database 110 .

The original shape extraction module 130 may be configured to extract the original shape from the building information model read by the BIM reading module 120 .

The original shape extraction module 130 may be configured to include a target space extraction unit 131 and an opening shape extraction unit 132 . Hereinafter, a detailed configuration will be described.

The target space extractor 131 may be configured to extract the target space from the building information model read by the BIM reading module 120 .

The opening shape extractor 132 may be configured to extract an opening shape including a door and a window from the building information model read by the BIM reading module 120 .

Here, with reference to FIG. 3 , information on the target space may be stored in the form of an IfcSpace class. In addition, the original shape extraction module 130 may extract the original shape by analyzing the structure of an Industry Foundation Classes (IFC) file, which is a storage format of the building information model.

In this case, in order to obtain information on the opening adjacent to the target space, information on the wall surrounding the space (IfcWall class) is first analyzed, and then opening information (IfcOpeningElement) included in each wall may be extracted.

The original shape extraction module 130 may extract the original shape by analyzing the structure of an Industry Foundation Classes (IFC) file, which is a storage format of the building information model.

The pre-processing module 140 may be configured to perform pre-processing on the target three-dimensional shape from the original shape extracted by the original shape extraction module 130 .

The pre-processing module 140 may be configured to include a three-dimensional integration unit 141 and a surface grid shape storage unit 142 . Hereinafter, a detailed configuration will be described.

The three-dimensional integration unit 141 may be configured to combine the target space extracted by the target space extraction unit 131 and the shape of the opening extracted by the opening shape extraction unit 132 .

The surface grid shape storage unit 142 may be configured to store the object space and the opening shape integrated in the three-dimensional integration unit 141 in the form of a surface grid. That is, it may be configured to express the integrated target building shape in the form of a B-rep (Boundary Representation) to approximate the shape of a polyhedron. In addition, numerical errors such as minute gaps between surfaces may occur during shape integration and polyhedral approximation. .

The three-dimensional surface classification module 150 may be configured to classify the three-dimensional surface of the target three-dimensional shape that has been pre-processed in the pre-processing module 140 into a main surface, a surface to be omitted, and an opening surface.

The three-dimensional surface classification module 150 may be configured to include a distance/angle reference setting unit 151 , a main surface designating part 152 , an opening surface designating part 153 , and an omission target surface designating part 154 . Hereinafter, a detailed configuration will be described.

The distance/angle reference setting unit 151 may be configured to set a distance reference and an angle reference of surface integration for setting the degree of shape simplification.

The major surface designation unit 152 may be configured to designate a major surface of a target three-dimensional shape on which pre-processing is performed in the pre-processing module 140 .

The opening surface designation unit 153 may be configured to designate the opening surface of the target three-dimensional shape on which the pre-processing is performed in the pre-processing module 140 .

The omission target surface designation unit 154 may be configured to designate the omit target surface of the target three-dimensional shape that has been pre-processed in the pre-processing module 140 .

More specifically, since the opening has a great influence on the simulation of the building environment, the shape of the opening is excluded from the simplification target, and the surface of the remaining wall may be configured to be classified through the following process. 4 shows the process of surface classification.

1) First, calculate area (a) and surface p for all surfaces.

는 표면

의 지표,

는 표면

의 면적,

는 표면

의 단위 법선 벡터이다.here,

silver surface

indicator of,

silver surface

the area of

silver surface

is the unit normal vector of .

)과 지표

에 따라 내림차순으로 정렬한다.2) and all surfaces by area (

) and indicators

sort in descending order according to

으로 지정하고 주요 표면으로 분류한다.3) And the first of the unclassified surfaces

and classified as a major surface.

을 제외한 모든 표면에 대해 다음 과정을 반복한다.4) and

Repeat the following process for all surfaces except .

라고 둘 때,

과

에 대해 다음 두 변수를 계산한다.4-1) Here, the target surface

When you say

class

Calculate the following two variables for

는 표면

(

)의 중심이다.here,

silver surface

(

) is the center of

를 생략 대상 표면으로 지정한다.4-2) And if all negative conditions are satisfied

is designated as the target surface to be omitted.

5) And repeat 3) and 4) until all target surfaces are classified as major or omitted target surfaces.

The polyhedron generating module 160 may be configured to generate a polyhedron to construct a simplified shape using the three-dimensional surface classified by the three-dimensional surface classification module 150 .

The polyhedron generating module 160 includes a bounding box generating unit 161 , a base three-dimensional shape forming unit 162 , a base three-dimensional shape dividing unit 163 , a base three-dimensional shape plane dividing unit 164 , and an original shape contrast unit 165 ). , it may be configured to include a three-dimensional shape selection unit 166 . Hereinafter, a detailed configuration will be described.

The bounding box generator 161 may be configured to generate a bounding box having a minimum size surrounding the target three-dimensional shape.

The base three-dimensional shape forming unit 162 may be configured to form a base three-dimensional shape having the same center and double the size of the bounding box generated by the bounding box generating unit 161 .

The base three-dimensional shape dividing unit 163 may be configured to divide the base three-dimensional shape formed by the base three-dimensional shape forming unit 162 . Figure 5 illustrates the division of the underlying three-dimensional shape.

The base three-dimensional shape plane dividing unit 164 may be configured to divide the main surface designated by the main surface designating unit 152 into an expanded plane in the base three-dimensional shape divided by the base three-dimensional shape dividing unit 163 .

The original shape contrast unit 165 may be configured to contrast the base three-dimensional shape divided by the base three-dimensional shape plane dividing unit 164 with the original shape.

The three-dimensional shape selection unit 166 may be configured to calculate a ratio overlapping the original shape among the volumes of the base three-dimensional shape as a result of the comparison of the original shape contrast unit 165, and select a solid having a ratio of 50% or more as a result of the calculation. 6 shows a screen in which a divided base company is selected.

The simplified shape obtaining module 170 may be configured to obtain a simplified shape by combining selected solids according to a polyhedral generation result of the polyhedral generating module.

7 is a flowchart of a method of simplifying a building shape of a building information model according to an embodiment of the present invention.

Referring to FIG. 7 , the BIM reading module 120 reads the building information model from the building information model previously stored in the BIM database 110 ( S101 ).

Next, the original shape extraction module 130 extracts the original shape from the building information model read by the BIM reading module 120 ( S102 ).

Next, the simplified shape acquisition module 170 acquires a simplified shape from the building information model read by the BIM reading module 120 ( S103 ).

Although described with reference to the above embodiments, those skilled in the art can understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the following claims. There will be

110: BIM database
120: BIM read module
130: original shape extraction module
131: target space extraction unit
132: opening shape extraction unit
140: preprocessing module
141: three-dimensional integration unit
142: surface grid shape storage unit
150: stereoscopic surface classification module
151: distance / angle reference setting unit
152: major surface designation
153: opening surface designation part
154: Skip target surface designation part
160: polyhedron generation module
161: bounding box generator
162: base three-dimensional shape forming part
163: base three-dimensional shape division part
164: base solid shape plane division part
165: original shape contrast part
166: three-dimensional shape selection unit
170: simplified shape acquisition module

Claims (4)

a BIM database in which a building information model (BIM) is stored;
a BIM reading module for reading a building information model from the building information model stored in the BIM database;
an original shape extraction module for extracting an original shape from the building information model read by the BIM reading module;
a pre-processing module for performing pre-processing on the target three-dimensional shape from the original shape extracted by the original shape extraction module;
a three-dimensional surface classification module for classifying a three-dimensional surface of a target three-dimensional shape, which has been pre-processed in the pre-processing module, into a main surface, a surface to be omitted, and an opening surface;
a polyhedron generating module for generating a polyhedron to construct a simplified shape using the three-dimensional surface classified by the three-dimensional surface classification module;
a simplified shape obtaining module for obtaining a simplified shape by combining selected solids according to the polyhedron generation result of the polyhedron generating module;
The original shape extraction module,
a target space extraction unit for extracting a target space from the building information model read by the BIM reading module;
and an opening shape extractor for extracting an opening shape including a door and a window from the building information model read by the BIM reading module,
The pre-processing module is
a three-dimensional integration unit for combining the target space extracted by the target space extraction unit and the opening shape extracted from the opening shape extraction unit;
It is configured to include a surface grid shape storage unit for storing the integrated target space and opening shape in the three-dimensional integration unit in the form of a surface grid,
The three-dimensional surface classification module,
a distance/angle reference setting unit for setting a distance standard and an angle standard of surface integration for setting the degree of shape simplification;
a main surface designation unit for designating a main surface of a target three-dimensional shape on which the pre-processing is performed in the pre-processing module;
an opening surface designation unit for designating an opening surface of a target three-dimensional shape on which pre-processing is performed in the pre-processing module;
It is configured to include an omission target surface designation unit for designating an omission target surface of the target three-dimensional shape on which preprocessing has been performed in the preprocessing module,
The polyhedron generating module is
a bounding box generating unit generating a bounding box having a minimum size surrounding the target three-dimensional shape;
a base three-dimensional shape forming unit for forming a base three-dimensional shape having the same center and double the size of the bounding box generated by the bounding box generating unit;
a base three-dimensional shape dividing part dividing the base three-dimensional shape formed in the base three-dimensional shape forming part;
a base three-dimensional plane dividing unit dividing the main surface designated by the main surface designating unit into an expanded plane from the base three-dimensional shape divided by the base three-dimensional shape dividing unit;
an original shape contrast unit for contrasting the base three-dimensional shape divided in the base three-dimensional shape plane dividing unit and the original shape;
Constructed to include a three-dimensional shape selection unit that calculates a ratio overlapping with the original shape among the volumes of the base three-dimensional shape as a result of the comparison of the original shape contrast part, and selects a solid having a ratio of 50% or more as a result of the calculation,
The three-dimensional surface classification module,
Step 1 of calculating the area (a) and the index p for each three-dimensional surface according to the following equation is performed,
[Equation]

here,

silver surface

indicator of,

silver surface

the area of

silver surface

is the unit normal vector of
The area of each of the three-dimensional surfaces (

) and indicators

Perform step 2 to sort in descending order according to
The first three-dimensional surface among the three-dimensional surfaces that are not classified in the three-dimensional surface classification module

and perform step 3 of classifying it as a major surface,
remind

Step 4 of performing the following process for each three-dimensional surface except for
Here, the target surface

, according to the following equation

class

for the following two variables

and

calculate,
[Equation]

[Equation]

here,

silver surface

(

) is the center of
If all the conditions of the following equation are satisfied

as the surface to be omitted,
[Equation]

here,

Is

is a predetermined threshold of

Is

is a predetermined threshold of
and performing step 5 of repeating steps 3 and 4 until all three-dimensional surfaces are classified as a major surface or a surface to be omitted.
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