KR20070049774A - Method for drawing 2-dimensional representations from multi-dimensional model - Google Patents

Abstract

The present invention relates to a method for creating a multidimensional model in a two-dimensional working drawing. The present invention provides a CAD drawing creation method comprising: a first step of determining the type of an object from multidimensional object information; a second step of extracting multidimensional shape information and attribute information of the object when the type of the object is determined; And a fourth step of selecting a method of creating a multi-dimensional object into a two-dimensional working drawing by using the information, and a fourth step of creating a two-dimensional working drawing according to the selected writing method. Therefore, the present invention increases the productivity of the work by enabling the multi-dimensional model information to be automatically created in a two-dimensional CAD working drawing.

CAD, compatible, multidimensional, model, drawing, automatic extraction

Description

Method for drawing 2-dimensional representations from multi-dimensional model}

1 is a flowchart illustrating a method of creating a conventional two-dimensional model in a three-dimensional drawing,

2 is a flowchart illustrating a method of FIG. 1;

3 is a block diagram illustrating a creation method according to an embodiment of the present invention;

4 is a table for selecting a method of creating a control unit of FIG. 3;

Figure 5 is a detailed flow chart for explaining the creation method of the present invention,

6A is a table for explaining parametric creation according to the present invention;

6b is a flowchart illustrating a parametric creation process according to the present invention;

7A is a table for explaining symbol mapping according to the present invention;

7B is a flowchart illustrating a symbol mapping process according to the present invention;

8 is a flowchart illustrating a projection process according to the present invention;

9 is a flowchart illustrating a drawing expression element insertion process according to the present invention;

10 is a screen state diagram showing a two-dimensional working drawing according to the preparation method of the present invention.

* Explanation of symbols for main parts of the drawings

30: 3D CAD data input unit 31: 3D IFC conversion unit

32: three-dimensional information extraction unit 33: control unit

34: 2D information storage unit 35: Parametric writing unit

36: symbol and comment mapping unit 37: projection unit

38: 2D CAD drawing output unit

The present invention relates to a method for creating a multidimensional model in a two-dimensional drawing. More specifically, in order to exchange and share facility information between complex engineering industries, two-dimensional drawing data is extracted from multi-dimensional model information of IFC (industry foundation classes), an international standard model based on project model, to draw two-dimensional working drawings. It is about a method.

       CAD, which is widely used to create multidimensional models, stands for computer aided design and is a computer-based design program.

       CAD does not draw the drawings one by one on the drafting table, but designs the information of the database while viewing and synthesizing the images of the CRT (cathode ray tube).

       And the contents designed by CAD are directly connected to CAM (Computer Aided Manufacturing, abbreviation of computer aided manufacturing), and through CAM, it gives accurate work operation instruction to NC (numerical control) machine tool. The manufacturing process such as inspection is managed by computer to ensure the speed of work and the precision of products.

       CAD ranges from 2-Dimensional (2D) CAD drawing drawings on two-dimensional planes to 3-Dimensional (3D) CAD programs that model objects with given instructions in a programmatic three-dimensional space where real products appear to exist. The 3D CAD program not only completely reproduces the three-dimensional shape on the computer screen, but also automatically calculates the physical properties such as the surface area, volume, weight, and strength of the target three-dimensional shape and designs it in a suitable form.

       Furthermore, CAD software has grown tremendously since the end of the 20th century, adding 'time' variables to 3D CAD programs to the so-called '4D' simulation.

There are various kinds of CAD according to the field used, such as architectural CAD, electronic CAD, mechanical CAD, clothing CAD.

Looking in more detail as follows.

(1) CAD programs (eg AutoCAD, IntelliCAD, FelixCAD, UniCAD) that can be used regardless of general-purpose CAD and can be conveniently adjusted by the user.

      (2) CAD programs that specialize in AEC architecture (eg AutoCAD ADT, ArchiCAD)

      (3) CAD programs designed to design EDA electronic circuits (eg OrCAD, PCAD)

     (4) CAD programs (eg AutoCAD MAP, OpenGIS) for making GIS geographic mapping

    (5) CAD programs dedicated to civil design such as CNS / FMS roads (eg Softdesk Civil / Survay, Dagle Point, Quick-Road)

     (6) CAD programs designed for MDA machines (eg MDT, Solid Works, Solid Edge, CADKEY, CADRA).

Such CAD has mutual compatibility in two or three dimensions for each program, and a description will be given with reference to FIGS. 1 and 2.

1 is a flowchart illustrating a method of creating a conventional two-dimensional model in a three-dimensional drawing.

FIG. 1 is a flowchart showing a conventional method of changing a pipe design from 2D CAD to 3D CAD, and analyzes (S20) that the transformation can be applied to the 2D CAD drawing (S10) and checks the correct value (S30). If not, the engineer reviewed and completed the construction structure information (S40), equipment nozzle information (S50), piping material and route information (S60), the shape, size, location (S55) of the equipment, piping three-dimensional model After completing the process, drawing the piping drawing (Isometric Drawing), totaling the piping material (S65), etc., and completing the 3D CAD model after the client's approval (S70) (S80).

FIG. 2 is a flowchart illustrating the method of FIG. 1.

FIG. 2 shows a drawing name and number in a two-dimensional CAD drawing 10, indicates a drawing boundary, indicates a device, a device basis, and the like. Through this, the pipe route, pipe parts, equipment nozzle chart, dimensions and pipe numbers indicated in the pipe diagram become basic data for drawing recognition.

       Generating symbol data for the equipment nozzle chart, pipe fittings, connecting parts, pipe grades, other special parts, etc. in the drawing recognition 20; Generating an neutral file for symbol data and generating a file capable of converting to 3D, and modifying and supplementing a file if necessary; Importing a file from an intermediate file and recognizing it as data and completing the 3D CAD recognition file of the data recognition contents; Through the identification of piping specifications, piping parts size, piping parts shape, building structure, device shape, device size, device location, device nozzle data, etc., the piping production and piping materials are counted. Complete 50).

       However, in the case of a simple file that does not require an intermediate file, the drawing can be directly passed to the step of checking data 40 from the recognition 20.

However, in the conventional method, two-dimensional CAD drawings can be displayed on the screen as three-dimensional CAD drawings, but there is no method of creating a three-dimensional or multidimensional model again in two-dimensional drawings.

Accordingly, an object of the present invention is to develop a two-dimensional drawing from multi-dimensional model information of IFC (industry foundation classes), which is an international standard model based on a project model, for the exchange and sharing of facility information between complex engineering industries. The present invention provides a method of creating a two-dimensional drawing of a multi-dimensional model for drawing two-dimensional working drawings by extracting data.

In order to achieve the above object, a method of creating a multidimensional model according to the present invention in a two-dimensional drawing includes a first step of determining the type of an object from multidimensional object information, and if the type of the object is determined, multidimensional shape information of the corresponding object. And a second step of extracting attribute information, a third step of selecting a method of creating a multidimensional object into a two-dimensional working drawing by using the extracted information, and a second step of creating a two-dimensional working drawing according to the selected writing method. Characterized in that it comprises four steps.

In addition, according to the present invention, it is characterized by writing at least one or more of parametric writing, symbol mapping, projection, and annotation expression.

According to the present invention, the parametric creation includes receiving object data including object information, attribute information, and shape information, checking a specification of an object, and reading out a specification value if a specification exists. , If the specification does not exist, checking the attribute information to read the attribute value, and generating the shape information by generating the shape information by operating the specification value and the attribute value as parameters to the preparation function. Characterized in that.

According to the present invention, symbol mapping includes receiving object data including object information, attribute information, and shape information, reading a code value by checking a symbol code of an object, and creating a read code value. It is characterized in that it comprises a step of creating a two-dimensional practical drawing by applying to the function.

According to the present invention, the projection is a step of receiving the object data including the object information, attribute information, and shape information, checking the shape of the object and projecting the shape, and the projected shape as it is two-dimensional Characterized in that it comprises the step of creating a practical drawing.

In addition, according to the present invention, the step of determining whether the representation element is the representation element input mode, and as a result of the determination, if the representation element input mode receives the user data, otherwise receiving the basic data, and And receiving any one of the user data and the basic data to generate the shape information and to create a two-dimensional working drawing.

Hereinafter, with reference to the accompanying Figures 3 to 8 will be described in detail a preferred embodiment of the present invention.

In the present invention, the multidimensional model refers to an object such as a door or a wall that is formed on a screen by drawing a drawing made in CAD more than three dimensions. And it is intended to be able to create a three-dimensional shape that has been shaped and manifested as a two-dimensional CAD drawing. In the following embodiment, the multidimensional model refers to a shape shown as a three-dimensional CAD drawing, and the three-dimensional example describes the multidimensional.

3 is a block diagram illustrating a creation method according to an embodiment of the present invention.

Referring to FIG. 3, a three-dimensional CAD data input unit 30 for receiving CAD data for a three-dimensional model, and a three-dimensional IFC transformation for converting the input three-dimensional CAD data into IFC data, an international industry standard for construction information. A unit 31, a three-dimensional information extraction unit 32 for extracting three-dimensional information from the converted three-dimensional IFC data, a two-dimensional information storage unit 34 and a three-dimensional information storing the two-dimensional information for creating And a control unit 23 for controlling IFC data to be created in a two-dimensional CAD drawing, and a two-dimensional CAD drawing output unit 39 for outputting a two-dimensional CAD drawing. In addition, the parametric creation unit 35 connected to the control unit 23 to construct a three dimensional IFC data into a two-dimensional CAD drawing and parametric drawing unit 35 and a three-dimensional IFC data are represented by a two-dimensional CAD drawing. Symbol mapping unit 36 for mapping and creating by using a symbol, and projection unit 37 for creating and projecting three-dimensional in two dimensions and annotation for representing three-dimensional IFC data in two-dimensional CAD drawings. It includes a drawing element insertion unit 38 for inserting and creating a drawing expression element in the form.

In FIG. 3, the 3D CAD data input unit 30 receives and outputs 3D CAD data for conversion. Here, the 3D CAD data refers to the 3D data of AutoCAD or Archi CAD as architectural CAD. In addition, IFC data is CAD data which converted CAD data into the IFC model. The 3D IFC converter 31 receives 3D CAD data and converts the 3D CAD data into 3D IFC data. Here, IFC is an international industry standard for construction information, and building CAD data can be converted into IFC data. The 3D IFC data is input to the 3D information extracting unit 32 to extract 3D information. That is, the 3D information includes 3D object information, shape information, and attribute information of the object. Here, the object information may know the types of objects such as walls, doors, and windows. The shape information can know the shape of each object and the property information can know the thickness, height and length of each object. The 3D information extracting unit 32 extracts object information for determining types of walls, doors, windows, and the like, and extracts shape information and attribute information of the corresponding object. The control unit 33 reads out corresponding 2D information from the 2D information storage unit 34 to express the extracted 3D information in 2D. The two-dimensional information storage unit 34 includes object information for forming a two-dimensional representation corresponding to the three-dimensional information, shape information, and attribute information of the object. The two-dimensional information storage unit 34 reads and uses the two-dimensional CAD drawing. The control unit 33 for generating three-dimensional IFC data in a two-dimensional CAD drawing controls the parametric creation unit 35, the symbol mapping unit 36, the projection unit 37, and the drawing expression element insertion unit 38. do. That is, the controller 33 previously stores the table diagram shown in FIG. 4, stores the creation method for each object, and selects according to the type of the object. That is, as shown in FIG. 4, the controller 33 controls to create parametric and drawing expression elements when the object type is a space IFCSPACE. The two-dimensional CAD drawing created here is a working drawing, which refers to a work drawing, a production drawing, a building specification drawing, and the like.

The parametric creating unit 35 constructs and draws a drawing shape of the object by using the attribute information constituting the object as a parametric technique for creating a two-dimensional drawing. The symbol mapping unit 36 creates a complex three-dimensional product as a symbol that can be easily recognized as a corresponding object on the drawing. The projection unit 37 projects the shape of the three-dimensional product and creates it in two dimensions. Drawing element insertion unit 38 is created by inserting elements for representing a variety of information in addition to the shape display of the object.

Operation of the parametric creation unit 35, the symbol mapping unit 36, the projection unit 37, and the drawing expression element insertion unit 38 will be described in more detail with reference to FIG. 5 below. Shall be.

In the above-described configuration, the parametric creation unit 35, the symbol mapping unit 36, the projection unit 37, and the drawing expression element insertion unit 38 are formed in the process of creating three-dimensional IFC data in a two-dimensional CAD drawing. Although described using, the method of using dimensions automatically or converting into KOSDIC data may be used.

The method of using dimensions automatically inserts dimension lines based on a constant axis or grid used to model the object. For example, the dimensions of the wall outline are automatically inserted around the centerline information of the wall. Automatically inserted dimension line is not created by hand, so delete move edit is available for user's convenience. For example, the currently applied method of automatically inserting dimensions changes from the centerline information of the wall object on which the dimension line is inserted, if the centerline is a polyline or compound line segment, the line segment of the smallest unit (line, arc) with a path. Insert a dimension of the wall object using a dimension line type that already has a certain distance to the left of the wall design, such as the location of the arrow or extension string. Meanwhile, the method of converting KOSDIC data is performed according to the mapping table between the two standards of IFC and KOSDIC.

In this way, the control unit 33 outputs the two-dimensional CAD drawing through the two-dimensional CAD drawing output unit 39. Accordingly, the user can view the converted two-dimensional CAD drawing on the screen.

5 is a detailed flowchart for explaining the preparation method of the present invention.

Referring to FIG. 5, an object of a product is extracted from three-dimensional IFC data (S1). That is, the type of the object such as whether the object is a wall, a door or a window is determined (S2). When the type of the object is determined, three-dimensional shape information and attribute information of the object are extracted (S3). Then, a method of creating a 3D object as a 2D CAD drawing is selected (S4). When the method to be created is selected in this way, a parametric writing process (S5), a symbol mapping process (S6), a projection technology process (S7), and a drawing expression element process (S8) are performed to create a two-dimensional CAD drawing. . When the preparation of the two-dimensional CAD drawing by the selected process is completed as described above, the two-dimensional drawing is output (S9).

In detail, the parametric creation process (S5) refers to the table of FIG. 6A and the flowchart of FIG. 6B.

Parametric creation (S5) is to create by creating a two-dimensional drawing of the object by using each attribute information constituting the object as a parametric. That is, two-dimensional shape information for drawing production is constructed using three-dimensional attribute information. Parametric creation firstly extracts information for creating two-dimensional shape objects from attribute information of three-dimensional objects. For example, if an object is a door, the property values such as the frame thickness and depth that form the outside of the door and the panel thickness and length are used as parameters. Second, it uses the extracted attribute value and passes it as a parameter to the formal writing function. In addition, since the elbow is defined in the KS standard value, the standard value is passed as a parameter to the preparation function. Third, the detailed dimensions of the configuration configuration are determined using the transmitted parameters, and a drawing is made according to the corresponding dimensions.

Referring to the flowchart of FIG. 6B, the parametric creation process S5 will be described in more detail. When the object data, the attribute information, and the shape information are called object data and the object data is input (S51), the standard is checked ( S52). If the standard exists, the process is performed according to the standard (S53). At this time, the standard value is read by applying the KS standard (S54). On the other hand, if the standard value does not exist, attribute information is checked (S57), and the attribute value is read out (S58). That is, the specification value and the attribute value act as parameters to the creation function to generate shape information (S55). after that. The two-dimensional information is read out and created as a two-dimensional CAD drawing (S56).

That is, referring to Fig. 6A, the shape of a three-dimensional door is created as a two-dimensional sliding door. All object information is extracted with attribute information based on the assumption that IFC rules are followed. Drawing generation technology through parametric includes not only the two-dimensional shape information of the object but also the style and is expressed differently according to the format and scale of the drawing. 6A, examples of the objects include walls and doors, and three-dimensional IFC object information for each type of object. If you look at the property description to be extracted, you can see the property information of each object and next to it, it shows the three-dimensional shape of the object. The result of parametric creation using the information of the 3D IFC CAD data can be known by the 2D attribute and the shape object 2D representation. If the object is a door, the two-dimensional attributes are frame length, thickness, etc., the shape object is a multi-line segment, and the drawing made in two dimensions is applied with a sliding door.

The symbolization mapping process S6 will be described with reference to FIGS. 7A and 7B.

The symbol mapping process S6 symbolizes a 3D object into a diagram or a string that is easy to recognize. Referring to FIG. 7A, a 3D image is shown in the case of a pipe and a 2D drawing of the 3D object. You can see how this is done. In other words, objects such as straights, elbows and tees are standardized and represented in two dimensions using the corresponding symbols. At this time, the code or the dimension information is extracted and represented as a symbol in the drawing.

The symbolization process S6 will be described in more detail with reference to the flowchart of FIG. 7B.

Referring to FIG. 7B, the object data is received (S61) and the symbol code is checked (S62). Here, the symbol code refers to a code value necessary for mapping such as a product name or a symbol according to a manufacturer. This code value is read out (S63) and applied to the creation function as it is to create a drawing (S64). At this time, the code value is shown as a file name (code) in FIG. 6A, and the actual code values are PA014, PA013, etc.

Projection description process (S7) is a method of projecting a three-dimensional object in two dimensions is used when projecting the shape as it is. In the case of a product that protrudes based on a basic two-dimensional shape, the two-dimensional shape is extracted by simply removing the height value. In this case, shape information such as a closed two-dimensional polyline or a composite line segment consisting of lines is extracted from the three-dimensional shape information.

Referring to the flowchart of Figure 8 will be described in more detail the projection description process (S7).

In Fig. 8, when object data is input (S71), the shape is checked (S72), and when a specific shape is checked, the shape is projected (S73). The projected shape is created as a two-dimensional drawing as it is (S74).

Drawing representation element insertion process (S8) refers to the display of a table that can be displayed together with a text annotation, or the width and the like indicating the name of the space in the drawings in the case of an object representing a space, such as a room, toilet, living room. To insert the drawing expression elements of these objects, attribute information representing the name, width, or boundary of the spatial object is extracted and composed of comments such as a string or a table. Normally, as shown in the table diagram in FIG. 4, only the annotation expression is displayed as project information, region, building information, floor information, and the like, a drawing form, a title bar, a dimension line, a table, and the like. Drawing element insertion is used to write data in a drawing or to indicate a particular object for easier recognition. For example, since the parametric and drawing element insertion are performed at the same time as the method for creating the spatial object of FIG. 4, a space such as a bathroom, a living room, etc. is created by parametric, and the name of the space is an annotation expression. Can be used as

9 is a flowchart illustrating a drawing expression element insertion process S8 according to the present invention.

Referring to FIG. 9, it is determined whether the mode is a mode for inputting a drawing expression element (S81). As a result of the determination, when it is not the drawing expression element input mode, basic data is input (S82). Here, in case of an object representing a space such as a room, a toilet, a living room, the basic data refers to data previously stored as a string comment indicating the name of the space in the drawing. As a result of the determination, in the drawing expression element input mode, drawing expression element data is received from the user (S83). The user data or the basic data is input as a drawing expression element to generate shape information (S84). after that. The two-dimensional information is read out and created as a two-dimensional CAD drawing (S85).

10 is a screen state diagram showing a two-dimensional working drawing according to the preparation method of the present invention.

10 shows a screen state created with a two-dimensional working drawing.

Therefore, the production method of the present invention provides an effect of increasing the efficiency of the work by enabling the creation of a two-dimensional CAD drawing using the multi-dimensional CAD data.

Claims (6)

In the CAD drawing creation method, A first step of determining the type of the object from the multidimensional object information; If the type of the object is determined, extracting multidimensional shape information and attribute information of the object; A third step of selecting a method of creating a multi-dimensional object into a two-dimensional working drawing by using the extracted information; And And a fourth step of creating a two-dimensional drawing in accordance with the selected drawing method. The method of claim 1, The third step is A method for creating a multidimensional model in a two-dimensional drawing, characterized in that it is created with at least one of parametric creation, symbol mapping, projection, and drawing representation elements. The method of claim 2, The parametric creation Receiving object data including object information, attribute information, and shape information; Checking a standard of the object and reading a standard value if a standard exists; If the standard does not exist, checking attribute information and reading an attribute value; And And generating the shape information by generating the shape information by acting as a parameter to the preparation function as the standard value and the attribute value, and creating a multi-dimensional model as a 2-dimensional drawing. The method of claim 2, The symbol mapping is Receiving object data including object information, attribute information, and shape information; Checking a symbol code of the object and reading a code value; And And generating a two-dimensional drawing by applying the read code value to a writing function. The method of claim 2, The projection is Receiving object data including object information, attribute information, and shape information; Checking the shape of the object and projecting the shape; And A method of producing a multi-dimensional model in a two-dimensional drawing comprising the step of creating the projected shape as a two-dimensional working drawing as it is. The method of claim 2, The drawing element is Determining whether the drawing expression element input mode is present; As a result of the determination, receiving the user data in the drawing expression element input mode; otherwise, receiving the basic data; And And generating shape information by receiving any one of the user data and the basic data, and creating a two-dimensional drawing in a two-dimensional drawing.

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