KR101552828B1 - Method for Obtaining Polygon Information of Three-dimensional Object Model - Google Patents
Method for Obtaining Polygon Information of Three-dimensional Object Model Download PDFInfo
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- KR101552828B1 KR101552828B1 KR1020150073639A KR20150073639A KR101552828B1 KR 101552828 B1 KR101552828 B1 KR 101552828B1 KR 1020150073639 A KR1020150073639 A KR 1020150073639A KR 20150073639 A KR20150073639 A KR 20150073639A KR 101552828 B1 KR101552828 B1 KR 101552828B1
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- G06T17/20—Finite element generation, e.g. wire-frame surface description, tesselation
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Abstract
The present invention relates to a polygon information extraction method of a three-dimensional object model, and more particularly, to a polygon information extraction method of a three-dimensional object model performed by a rendering processing apparatus for expressing a shape of a three-dimensional object model or a two- Constructing a plurality of three-dimensional polygons by arranging three-dimensional vertex coordinates forming the shape of the three-dimensional object model on the basis of a vertex index; Intersecting the three-dimensional object model with a target plane including a horizontal or vertical cross-section of the three-dimensional object model; Dimensional polygons are generated by extracting intersection information by checking whether an intersection where one surface of a plurality of three-dimensional polygons intersects with the target plane is generated is detected based on the target plane, and when a plurality of intersections occur in the three- Extracting and storing at least one connected intersection segment; And analyzing a connection relation of the at least one intersection line segment and constructing the closed two-dimensional polygon information by merging the intersection line segments according to the analyzed connection relation. Accordingly, the present invention extracts the cross-sectional information of the three-dimensional object model as two-dimensional polygon information, and generates a two-dimensional object model using the two-dimensional polygon information. Based on the two-dimensional polygon information, And can be used as basic data for authoring two-dimensional contents such as a document.
Description
The present invention relates to a polygon information extraction method for a three-dimensional object model, and more particularly, to a two-dimensional polygon information extraction method for extracting two-dimensional polygon information about a desired point from three- And a method of extracting polygon information of a 3D object model.
Most car and portable navigation devices rely on a two-dimensional navigation map to visualize key features, such as buildings, in 2D, but a three-dimensional vehicle navigation system is emerging. Most of these 3D navigation systems use photorealistic rendering techniques to visualize 3D building data.
This visualization technique based on realistic rendering requires accurate geometric models and detailed realistic building textures, and it is necessary to match the rendered 3D buildings, roads or other objects with actual buildings, roads or other objects as closely as possible have.
A three-dimensional mesh (Mesh) refers to a bundle of data, such as a point, a plane, used to represent an object in three dimensions on a graphical basis. These three-dimensional meshes are widely applied to various applications representing three-dimensional objects. The three-dimensional mesh consists of triangles made up of vertices and three vertices, and these triangles are gathered to complete one complete mesh. In real life, in order to express a building in three dimensions, the information of a triangle is connected to one another in a complicated shape.
As prior art data, Korean Patent Laid-Open No. 2009-0076412 proposes a method and apparatus for generating a vertex having a three-dimensional position corresponding to a depth value of each of pixels of a depth image representing an object, For each pixel belonging to the non-boundary of the object among the pixels, the polygon mesh is grouped by grouping the belonging pixel and the adjacent pixels of the belonging pixel and connecting the vertices to each other considering the grouped results.
Korean Patent Laid-Open Publication No. 10-2014-0040416 discloses a three-dimensional object generation apparatus and a method thereof. The three-dimensional object generation apparatus divides the components of a two-dimensional web page into a plurality of polygons, When an object manipulation signal is input in the generated 3D object, a 3D transform matrix is generated by changing the vertex coordinate value of the corresponding individual grid element according to the object manipulation signal, and a 3D transform matrix is applied to the predefined CSS transform, And a three-dimensional object manipulation processor for generating a dimensional object.
As described above, a technique for generating a three-dimensional object based on a three-dimensional mesh requires a basic three-dimensional transformation technique and a two-dimensional transformation technique (2D transformation) Dimensional polygon information such as a cross-sectional view can not be extracted.
Therefore, in order to extract the shape information of a two-dimensional building that is easy for a person to recognize based on a plane of height designated by a user in a conventional three-dimensional building having a precise and complicated shape, There is a problem that the shape information of the two-dimensional building must be directly drawn by the user.
In the case of a three-dimensional building, since the three-dimensional model is merely representing the overall shape, not only the floor layout and the floor plan can be confirmed, but also it can not be applied to the building analysis and statistical system performed in two dimensions. That is, there is a problem that it is not possible to directly express the dimension and the layout in a two-dimensional drawing format even though the three-dimensional model can individually confirm dimensions and arrangements. Therefore, in order for the user to check the dimensions and the layout of the building and to check the detailed configurations, a two-dimensional drawing in which concrete data is written in an obvious manner, for example, a floor plan or a sectional view corresponds to an essential element can do.
Korean Patent Application No. 2007-0049774 discloses a method of creating a two-dimensional drawing by extracting multidimensional shape information and attribute information of a corresponding object from multidimensional object information, .
Even a program for such a three-dimensional model has a problem that it can not directly use the function of converting a three-dimensional model into a two-dimensional drawing even if it is converted into a two-dimensional drawing. That is, the data created from the two-dimensional drawing from the three-dimensional model data by using the basic function is inferior to the drawing created by artificially using the AUTOCAD, the drawing itself is coarse, and the expressed information The amount and quality level of the user is very low, so that the user must carry out the work again with the direct measurement.
In addition, since the two-dimensional drawings converted from the three-dimensional model data must manually fill in the dimensions or the arrangement of the components, the user must fill in the wrong information, which is different from the original design, have.
The present invention extracts points physically intersecting a target plane and a three-dimensional object model with reference to a target plane of a height specified in a three-dimensional object model, and analyzes connection relationships for connecting the points to a closed two- Dimensional shape information of a three-dimensional object model that can be easily recognized by a user in a three-dimensional object model having a precise and complex shape by providing two-dimensional shape information.
Among the embodiments, a polygon information extraction method of a three-dimensional object model is a polygon information extraction method of a three-dimensional object model performed by a rendering processing apparatus for expressing a shape of a three-dimensional object model or a two- Constructing a plurality of three-dimensional polygons by arranging three-dimensional vertex coordinates forming a shape of the three-dimensional object model on the basis of a vertex index; Intersecting the three-dimensional object model with a target plane including a horizontal or vertical cross-section of the three-dimensional object model; Dimensional polygons are generated by extracting intersection information by checking whether an intersection where one surface of a plurality of three-dimensional polygons intersects with the target plane is generated is detected based on the target plane, and when a plurality of intersections occur in the three- Extracting and storing at least one connected intersection segment; And analyzing a connection relation to the at least one intersection line segment, and constructing the closed two-dimensional polygon information by merging the intersection line segments according to the analyzed connection relationship.
The target plane is composed of a plurality of polygons, and is formed to be larger than a cross section of the three-dimensional object model.
Dimensional polygons are generated by extracting intersection information by checking whether an intersection where one surface of a plurality of three-dimensional polygons intersects with the target plane is generated is detected based on the target plane, and when a plurality of intersections occur in the three- The step of extracting and storing at least one intersection line segment connected may include extracting coordinates of the intersection point by line segments of the three-dimensional polygon and storing the intersection point information as intersection information; And setting two intersection points as a start point and an end point when two intersection points exist for each line segment of the three dimensional polygon and extracting and storing an intersection line segment connecting the start point and the end point for each segment of the three dimensional polygon .
The step of analyzing the connection relation with respect to the at least one intersection line segment and constructing the closed two-dimensional polygon information by merging the intersection line segments according to the analyzed connection relationship may include: Identifying an intersection line segment having the same coordinate value as the starting point of the line segment and confirming the connection relation; And constructing coordinates of a closed two-dimensional polygonal space by connecting all intersection lines extracted and stored for each line segment of the three-dimensional polygon in such a manner that the end points having the same coordinate value and the starting point are mutually merged .
delete
The closed-form two-dimensional polygon information is a two-dimensional shape information of a vertical section or a horizontal section of the three-dimensional object model.
The polygon information extraction method of the three-dimensional object model of the present invention extracts the cross-sectional information of the three-dimensional object model as two-dimensional polygon information, generates a two-dimensional object model using the two-dimensional polygon information, Based on the information, it can be used as basic data for authoring two-dimensional contents such as floor plans and maps, and can be applied to building analysis and statistics system using existing two-dimensional data, It is effective.
1 is a view for explaining a rendering processing apparatus for performing a polygon information extraction method of a three-dimensional object model according to an embodiment of the present invention.
2 is a flowchart illustrating a method of extracting polygon information of a three-dimensional object model according to an exemplary embodiment of the present invention.
3 is a view for explaining the shape of the three-dimensional object model of FIG.
FIG. 4 is a view for explaining polygon information for the 3D object model of FIG. 3. FIG.
FIG. 5 is a view for explaining a state in which a target plane is arranged in the three-dimensional object model of FIG. 3. FIG.
Fig. 6 is a view for explaining points where the polygon of Fig. 5 intersects with the target plane.
FIG. 7 is a view for explaining an analysis process for a point at which a first line segment of the polygon shown in FIG. 5 intersects with a target plane.
FIG. 8 is a view for explaining an analysis process for a point at which a second line segment of the polygon shown in FIG. 5 intersects with a target plane.
FIG. 9 is a view for explaining an analysis process for a point at which a third line segment of the polygon shown in FIG. 5 intersects with a target plane.
Fig. 10 is a view for explaining points where the other polygons in Fig. 5 intersect with the target plane.
FIG. 11 is a view for explaining an intersection line segment for all polygons of the three-dimensional object model of FIG. 3. FIG.
FIG. 12 is a view for explaining the merging state of the intersection lines of FIG. 11. FIG.
13 is a view for explaining closed two-dimensional polygon information generated by a polygon information extraction method of a three-dimensional object model according to an embodiment of the present invention.
Fig. 14 is a plan view of Fig. 13. Fig.
The description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas. Also, the purpose or effect of the present invention should not be construed as limiting the scope of the present invention, since it does not mean that a specific embodiment should include all or only such effect.
Meanwhile, the meaning of the terms described in the present invention should be understood as follows.
The terms "first "," second ", and the like are intended to distinguish one element from another, and the scope of the right should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.
It is to be understood that when an element is referred to as being "connected" to another element, it may be directly connected to the other element, but there may be other elements in between. On the other hand, when an element is referred to as being "directly connected" to another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.
It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.
In each step, the identification code (e.g., a, b, c, etc.) is used for convenience of explanation, the identification code does not describe the order of each step, Unless otherwise stated, it may occur differently from the stated order. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.
All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used predefined terms should be interpreted to be consistent with the meanings in the context of the related art and can not be interpreted as having ideal or overly formal meaning unless explicitly defined in the present invention.
1 is a view for explaining a rendering processing apparatus for performing a polygon information extraction method of a three-dimensional object model according to an embodiment of the present invention.
Referring to FIG. 1, the
The
The
The
The
The
Here, each of the
2 is a flowchart illustrating a method of extracting polygon information of a three-dimensional object model according to an exemplary embodiment of the present invention. 3 is a view for explaining the shape of the three-dimensional object model of FIG. 2, FIG. 4 is a view for explaining polygon information of the three-dimensional object model of FIG. 3, In which a target plane is disposed.
2 to 5, a polygon information extraction method of a three-dimensional object model includes arranging three-dimensional vertex coordinates forming a shape of a three-
3 and 4, when the
The
The
FIG. 6 is a view for explaining points of intersection between the polygon and the target plane in FIG. 5, FIG. 7 is a view for explaining an analysis process for a point at which a first line segment of the polygon in FIG. 5 is an explanatory view of an analysis process for a point at which the second line segment of the polygon of FIG. 5 intersects with the target plane, FIG. 9 illustrates an analysis process of a point at which the third line segment of the polygon of FIG. And Fig. 10 is a view for explaining points where the other polygons in Fig. 5 intersect with the target plane.
6 to 10, the
6, when the intersection of the faces of the
Thereafter, as shown in Fig. 8, the intersection coordinates of EA2 are acquired because there is an intersection of EA2 on one side of the line A2A3 of the reference three-
The
Referring again to FIG. 2, the
The
FIG. 11 is a view for explaining an intersection line segment for all polygons of the three-dimensional object model of FIG. 3, and FIG. 12 is a view for explaining a merging state of intersection lines of FIG.
11 and 12, the intersection segment EA1EA2 of the
The
The
In this manner, all intersection lines are merged, and finally, the closed two-dimensional polygon information is calculated by connecting the starting point (EA1) of the intersection line segment of the mesh A and the end point of the intersection line segment of the mesh H (S8 and S9)
FIG. 13 is a view for explaining closed two-dimensional polygon information generated by a polygon information extraction method of a three-dimensional object model according to an embodiment of the present invention, and FIG. 14 is a plan view of FIG.
13 and 14, the
In other words, the connection relationship of the intersection lines with respect to the mesh A to the mesh H is checked based on the
The
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that
110: mesh modeling module 120: vertex module
130: rendering module 140: control module
150: storage module
Claims (5)
Constructing a plurality of three-dimensional polygons by arranging three-dimensional vertex coordinates forming a shape of the three-dimensional object model on the basis of a vertex index;
Intersecting the three-dimensional object model with a target plane including a horizontal or vertical cross-section of the three-dimensional object model;
Dimensional polygons are generated by extracting intersection information by checking whether an intersection where one surface of a plurality of three-dimensional polygons intersects with the target plane is generated is detected based on the target plane, and when a plurality of intersections occur in the three- Extracting and storing at least one connected intersection segment; And
Dimensional polygon information by analyzing a connection relation of the at least one intersection line segment and merging the intersection line segments according to the analyzed connection relationship. A method for extracting polygon information of a model.
Wherein the target plane is composed of a plurality of polygons and is formed to be larger than a cross section of the three-dimensional object model.
Dimensional polygons are generated by extracting intersection information by checking whether an intersection where one surface of a plurality of three-dimensional polygons intersects with the target plane is generated is detected based on the target plane, and when a plurality of intersections occur in the three- The step of extracting and storing at least one intersection line segment,
Extracting coordinates of the intersection points by line segments of the three-dimensional polygon and storing the coordinates as intersection information; And
Dimensional polygon, two intersecting points are set as a starting point and an ending point when two intersecting points exist in the three-dimensional polygon, and an intersecting line segment connecting the starting point and the ending point is extracted and stored for each line segment of the three-dimensional polygon And extracting the polygon information of the three-dimensional object model.
The step of analyzing the connection relation of the at least one intersection line segment and constructing the closed two-dimensional polygon information by merging the intersection line segments according to the analyzed connection relation,
Identifying an intersection line segment having an end point of the intersection line segment and a start point of another intersection line segment having the same coordinate value, and confirming a connection relationship; And
Constructing coordinates of a closed two-dimensional polygonal space by linking all intersection lines extracted and stored for each line segment of the three-dimensional polygon in such a manner that the end points having the same coordinate value and the starting point are mutually merged; And extracting the polygon information of the three-dimensional object model.
Wherein the closed-form two-dimensional polygon information is two-dimensional shape information of a vertical section or a horizontal section of the three-dimensional object model.
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Cited By (6)
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CN110851930A (en) * | 2019-10-12 | 2020-02-28 | 天津大学 | WebGL-based surface wiring design method and system |
KR20200033620A (en) | 2018-09-20 | 2020-03-30 | 한국항공우주산업 주식회사 | Method of calculating cross-sectional cutting coordinates of aircraft shape model |
CN111319264A (en) * | 2018-12-17 | 2020-06-23 | 苏州苏大维格科技集团股份有限公司 | Data processing method applied to 3D printing equipment and 3D printing equipment |
CN112069725A (en) * | 2020-08-03 | 2020-12-11 | 彭涛 | High-precision slice obtaining method and device for 3D printer |
KR102271064B1 (en) * | 2020-04-17 | 2021-06-30 | 뉴레이어 주식회사 | Floor separation method for 3D building model, system and computer readable medium recording the method |
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JP2006164219A (en) | 2004-11-09 | 2006-06-22 | Phifit Kk | Interface for analyzing finite-element, computer-readable storage medium which records program of interface for analyzing finite-element, method for analyzing finite-element using high value-added communication network, parallel processing computer for analyzing finite-element, and computer for analyzing finite-element |
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JP2000509150A (en) | 1996-04-24 | 2000-07-18 | サイラ・テクノロジーズ・インク | Integrated device for imaging and modeling three-dimensional objects |
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KR20200033620A (en) | 2018-09-20 | 2020-03-30 | 한국항공우주산업 주식회사 | Method of calculating cross-sectional cutting coordinates of aircraft shape model |
CN111319264A (en) * | 2018-12-17 | 2020-06-23 | 苏州苏大维格科技集团股份有限公司 | Data processing method applied to 3D printing equipment and 3D printing equipment |
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CN110851930A (en) * | 2019-10-12 | 2020-02-28 | 天津大学 | WebGL-based surface wiring design method and system |
KR102271064B1 (en) * | 2020-04-17 | 2021-06-30 | 뉴레이어 주식회사 | Floor separation method for 3D building model, system and computer readable medium recording the method |
CN112069725A (en) * | 2020-08-03 | 2020-12-11 | 彭涛 | High-precision slice obtaining method and device for 3D printer |
CN112069725B (en) * | 2020-08-03 | 2024-03-08 | 彭涛 | High-precision slice acquisition method and device for 3D printer |
KR102519605B1 (en) * | 2022-02-28 | 2023-04-10 | 한국가상현실 (주) | Method and device for interconverring among 3d frameworks regarding 3d object |
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