WO2016050082A1

WO2016050082A1 - Platform for displaying three-dimensional image of a building and application system thereof

Info

Publication number: WO2016050082A1
Application number: PCT/CN2015/079423
Authority: WO
Inventors: 黎川; 刘栋才; 陈奕
Original assignee: 苏州四方万象信息科技有限公司
Priority date: 2014-09-29
Filing date: 2015-05-21
Publication date: 2016-04-07
Also published as: WO2016050081A1; CN104318513A

Abstract

Disclosed is a platform for displaying a three-dimensional image of a building, which is a platform for reading a three-dimensional image file of a building and displaying a three-dimensional image, characterized by comprising the following modules: a data importing module responsible for reading the three-dimensional image file line by line and parsing the three-dimensional image file in order to obtain three-dimensional geometric data of the building; a three-dimensional display module responsible for displaying the three-dimensional image of the building according to the obtained three-dimensional geometric data of the building, and the display engine of the three-dimensional display module is realized through utilizing visualization toolkit (VTK) technology. Moreover, also disclosed is an application system of the platform. The platform for displaying a three-dimensional image of a building and application system thereof in the present invention can automatically analyze a DXF file and generate a corresponding two-dimensional plane data drawing and three-dimensional building data in the software, thus constructing a cloud network-based three-dimensional image of a building, such that a user can view the interior structure of any building in an area quickly and conveniently.

Description

Building three-dimensional image display platform and its application system

Technical field

The invention belongs to information technology, in particular to a three-dimensional image display platform for buildings and an application system thereof.

Background technique

AutoCAD (Drawing Interchange Format or Drawing Exchange Format) drawing exchange file. DXF is a CAD data file format developed by Autodesk for the exchange of CAD data between AutoCAD and other software. DXF is an open vector data format that can be divided into two categories: ASCII format and binary format; ASCII has good readability, but it occupies a large space; binary format occupies less space and reads faster. Since Autocad is now the most popular cad system, DXF is also widely used as the de facto standard. The basic composition of a DXF file is as follows:

HEADER section - the overall information of the graph. Each parameter has a variable name and corresponding value. The CLASSES section - contains information about the classes defined by the application, which will be displayed in the BLOCKS, ENTITIES, and OBJECTS sections. Information that is sufficient for interaction with other applications is generally not included. TABLES section - This section includes definitions for named entries. Application ID (APPID) table, Block Recod (BLOCK_RECORD) table, Dimension Style (DIMSTYPE) table, Layer (LAYER) table, Linetype (LTYPE) table, Text style (STYLE) table, User Coordinate System (UCS) table, View ( VIEW) table, Viewport configuration (VPORT) table BLOCKS part, this part includes the Block Definition entity used to define the composition of each block. In the ENTITIES section, this section is the drawing entity, including the Block References. The OBJECTS section -- includes data for non-graphic objects for use by AutoLISP and ObjectARX applications. THUMBNAILIMAGE section - Includes a preview of the DXF file. END OF FILE.

Structural design of buildings usually uses two-dimensional DXF drawings, which are neither intuitive nor further developed, such as many 3D applications involving buildings, such as decoration design.

How to "read" a two-dimensional DXF file into a three-dimensional image is one of the objects of the present invention; after converting into a three-dimensional image, if the three-dimensional image is displayed; and using the above technique to construct a region, The entire building map of the area and the city, so that the user can view the internal structure of the designated building at any time for use by the fire, public security and other systems, which are technical problems to be solved by the present invention.

Summary of the invention

In order to solve the above problems, the present invention provides a three-dimensional image display platform, a display platform, and an application system thereof that can be completed by little operation.

The technical solution of the present invention is to provide a three-dimensional image display platform for a building, which is a platform for reading a three-dimensional image file of a building and displaying the three-dimensional image, characterized in that it comprises the following modules:

The data import module is responsible for reading and parsing the three-dimensional image file line by line to obtain the three-dimensional geometric data of the building;

The three-dimensional display module is responsible for realizing display of the three-dimensional image of the building according to the obtained three-dimensional geometric data of the building, and the display engine of the three-dimensional display module is realized by using a visual tool library VTK technology. VTK: Visualization tool library.

Preferably, the three-dimensional display module uses the depth stripping technology of the visual tool library to realize the transparent display of each entity of the building, so that the entities of the building can adjust the transparency when displayed. DEPTH PEELING: Deep stripping, which is based on a multi-layered rendering of z-buffer, an algorithm that tracks the depth of each pixel on the screen. Each layer rendering is based on the depth value of the previous layer rendering.

Preferably, the three-dimensional display module further provides a human-computer interaction interface to realize enlargement, reduction, rotation, translation, decomposition, display or hidden operation of each entity of the building.

The invention also provides an application system according to the three-dimensional image display platform of the building, which comprises the following modules:

a file management module responsible for constructing and managing three-dimensional image files of buildings in one or more areas;

The user management module is responsible for maintaining user and user rights, so that the designated user has the right to access the designated building;

The three-dimensional image display platform of the building is responsible for providing a human-computer interaction interface to display a three-dimensional image of the building.

Preferably, the file management module obtains a three-dimensional image file of a building by using a method for generating a three-dimensional image based on a DXF file, and the method includes the following steps:

1) Pre-processing, manually setting the layer information corresponding to different building components in the DXF file, and marking with the set name;

2) Import processing, identifying the information of the building component from each layer according to the set name, and sequentially importing the layers in the DXF file;

3) Identifying and processing, reading the data of the DXF file line by line, taking out the geometric information of the building component and saving separately, the geometric information of the building component includes obtaining the basic geometric data of the corresponding structure from the DXF file: point, straight line, arc, circle And rectangle; converting the building component into a closed contour according to the obtained geometric data information, thereby obtaining two-dimensional plane data required for constructing the three-dimensional building data;

4) Post-processing, according to the geometric correlation of the drawing, the multi-layer structure expressing the thickness of the wall and the window is converted into a single-layer structure;

5) Display and manual editing processing, display the imported various building components, and provide a human-computer interaction interface for the operator to manually modify and improve the errors generated during the import process;

6) Stretching processing, stretching the two-dimensional plane data of the imported building components, generating three-dimensional data corresponding to the building component, and saving the three-dimensional image format to be applied to the three-dimensional display.

Preferably, in the step 1), if the buildings in the DXF file are multi-layered and the drawings of each layer are different, the corresponding drawings of each layer are separated to be separately imported.

Preferably, in the step 3), if the block information exists in the drawing, the block information is all converted into basic graphic information composed of points, lines, circles and arcs in advance.

Preferably, the model library module is further included, and is responsible for automatically generating a three-dimensional image file of non-generic components in the building.

Preferably, the cloud file server based on the Internet cloud network is further included, and is responsible for storing the three-dimensional image file of the building and the geographical location and name of the corresponding building.

The three-dimensional image display platform of the building and the application system thereof can automatically analyze the DXF file, generate corresponding two-dimensional plane data drawings in the software and generate three-dimensional building data, thereby constructing a three-dimensional map of the building based on the cloud network, so that Users can quickly and easily view the internal structure of any building in the area.

detailed description

Specific embodiments of the invention are described in further detail below.

A three-dimensional image display platform for a building of the present invention first adopts a method for generating a three-dimensional image based on a DXF file to construct a three-dimensional image of a building from a most common and easily available two-dimensional DXF file, the method comprising The following steps:

1) Pre-processing, manually setting the layer information corresponding to different building components such as walls, doors, windows, columns, etc. in the DXF file, and identifying them with the set name; if the building in the DXF file is multi-layered, If the drawings of each layer are different, the corresponding drawings of each layer are separated to be imported separately;

3) Identifying and processing, reading the data of the DXF file line by line, taking out the geometric information of the building component and saving separately, the geometric information of the building component includes obtaining the basic geometric data of the corresponding structure from the DXF file: point, straight line, arc, circle And rectangle; according to the obtained geometric data information, the building component is converted into a closed contour, thereby obtaining the two-dimensional plane data required for constructing the three-dimensional building data; if there is block information in the drawing, the block information is all converted into points in advance, Basic graphic information consisting of lines, circles, and arcs. Blocks are commonly used terms in autocad. They refer to the combination of some common structures into a whole, called blocks, to facilitate overall movement, copying, etc.

6) Stretching processing, stretching the two-dimensional plane data of the imported building components, generating three-dimensional data corresponding to the building component, and saving the data into a VTK data format for application to the three-dimensional display.

A three-dimensional image display platform for a building of the present invention includes the following modules:

The three-dimensional display module is responsible for realizing the display of the three-dimensional image of the building according to the obtained three-dimensional geometric data of the building, and the display engine of the three-dimensional display module is realized by the visual tool library VTK technology. The display engine was built using the internationally leading 3D scientific computing visualization engine VTK. The programming language is in Python. Python is currently the most popular simultaneous object-oriented and process-oriented cross-platform high-level language, including a large number of standard and third-party library functions to achieve various functions, including scientific computing, GUI design, database and hardware interaction. VTK: visualization toolkit, vtk is an open source software library, mainly used for 3D computer graphics, image processing and visualization, VTK format data, STL format data, etc.

The 3D display module uses the depth stripping technology of the visual tool library to realize the transparent display of each entity in the building, so that the entities of the building can adjust their transparency when displayed. The display characteristics of various building entities (walls, doors, windows) are carefully adjusted, such as reflective, transparency, texture, etc., and the multi-layered solution is correctly solved by the industry-leading Depth Peeling technology provided by VTK. The transparent display problem after the entity is superimposed makes the structure of the entire building clearly and realistically represented. Compared with the current market building display software, the current market building display software usually only displays the outer contour structure in an opaque form, that is, only the shape of the building can be seen, and the internal structure of the building cannot be seen. Our building's three-dimensional display uses a transparent process that allows the interior structure of the building to be seen in perspective from outside the building, while providing user-selectable features, either transparent or opaque.

The three-dimensional display module also provides a human-computer interaction interface to realize enlargement, reduction, rotation, translation, decomposition, display or hide operation of various entities of the building.

The display module must allow the user to freely zoom in, rotate, and translate the entire building model to view a particular floor and show or hide certain floors or entities. In addition, direct control of the position and orientation of individual entities can translate and rotate all of the entities of a single floor, allowing the user to view the single layer structure unobstructed. Compared with other software on the market, our display provides a disassembled display of the multi-storey structure of the building, which can display the explosion between the floors of the building (ie, a relative distance between each floor of the building for a clearer Observe), in addition, our display provides users with the ability to extract a single layer of display from the entire building and provide interactive functions.

The invention also provides an application system for a three-dimensional image display platform of a building, which comprises the following modules:

It also includes a model library module that is responsible for automatically generating 3D image files of non-generic parts within a building. For the various non-universal decorative parts included in the building, such as desks, fire hydrants, etc., use the most advanced modeling dynamic library Parasolid kernel to automatically generate various CAD spline models, and then convert them into STL files. Format, these models can be arbitrarily copied and resized and oriented, and the technology efficiently handles the problem of adding 3D solids in bulk.

The Parasolid kernel is a dynamic software library available on the market for building structural models such as tables, chairs, stairs, and more. STL format data: A general structure expression data format.

Since the three-dimensional data of the building only includes the basic building structure information such as doors, windows, walls, etc., when used for the user, it is usually necessary to have more detailed internal structures of the building, such as fire hydrants, tables and chairs, and the like. In order to conveniently provide and edit these structures, the Parasolid kernel dynamic modeling library is used to build the model library. Operators can automatically generate various models and save them as STL format data through the Parasolid kernel.

It also includes a cloud file server based on the Internet cloud network, which is responsible for storing the three-dimensional image files of the building and the geographical location and name of the corresponding building. The user obtains the required three-dimensional data of the building from the cloud file server according to the respective user rights, thereby displaying the view locally. The user's search function for 3D data is based on the industry-leading distributed real-time search engine Elastic Search. The user inputs the relevant geographical location information, and the platform will return the location index of the relevant building on the file server in real time. For example, when a user needs to find a certain building data, by inputting the location information and name of the building, such as “Hefei Swan Lake Wanda Plaza”, the platform will return the data of the building according to the user authority. For example, certain sensitive buildings can only be accessed by fixed personnel.

The above embodiments are only one of the embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A three-dimensional image display platform for a building, which is a platform for reading a three-dimensional image file of a building and displaying the three-dimensional image, characterized in that it comprises the following modules:

The data import module is responsible for reading and parsing the three-dimensional image file line by line to obtain the three-dimensional geometric data of the building;

The three-dimensional display module is responsible for realizing display of the three-dimensional image of the building according to the obtained three-dimensional geometric data of the building, and the display engine of the three-dimensional display module is realized by using a visual tool library VTK technology.
The three-dimensional image display platform for a building according to claim 1, wherein the three-dimensional display module realizes display transparency of each entity of the building by using a deep peeling technology of the visual tool library, so that each entity of the building displays You can adjust its transparency.
The three-dimensional image display platform for a building according to claim 2, wherein the three-dimensional display module further provides a human-machine interaction interface for realizing enlargement, reduction, rotation, translation, decomposition, display or hiding operation of each entity of the building.
An application system for a three-dimensional image display platform for a building according to any one of claims 1-3, characterized in that it comprises the following modules:

a file management module responsible for constructing and managing three-dimensional image files of buildings in one or more areas;

The user management module is responsible for maintaining user and user rights, so that the designated user has the right to access the designated building;

The three-dimensional image display platform of the building is responsible for providing a human-computer interaction interface to display a three-dimensional image of the building.
The application system according to claim 4, wherein the file management module obtains a three-dimensional image file of a building by using a method for generating a three-dimensional image based on a DXF file, and the method comprises the following steps: 1) preprocessing, artificial Set the layer information corresponding to different building components in the DXF file, and mark it with the set name;

2) Import processing, identifying the information of the building component from each layer according to the set name, and sequentially importing the layers in the DXF file;

3) Identifying and processing, reading the data of the DXF file line by line, taking out the geometric information of the building component and saving separately, the geometric information of the building component includes obtaining the basic geometric data of the corresponding structure from the DXF file: point, straight line, arc, circle And rectangle; converting the building component into a closed contour according to the obtained geometric data information, thereby obtaining two-dimensional plane data required for constructing the three-dimensional building data;

4) Post-processing, according to the geometric correlation of the drawing, the multi-layer structure expressing the thickness of the wall and the window is converted into a single-layer structure;

5) Display and manual editing processing, display the imported various building components, and provide a human-computer interaction interface for the operator to manually modify and improve the errors generated during the import process;

6) Stretching processing, stretching the two-dimensional plane data of the imported building components, generating three-dimensional data corresponding to the building component, and saving the three-dimensional image format to be applied to the three-dimensional display.
The application system according to claim 5, wherein in the step 1), if the building in the DXF file is a multi-layer structure and the drawings of each layer are different, the drawings corresponding to each layer are separated to respectively Import it.
The application system according to claim 6, wherein in the step 3), if the block information exists in the drawing, the block information is all converted into basic graphic information composed of points, lines, circles, and arcs in advance.
The application system of claim 7 further comprising a model library module responsible for automatically generating a three-dimensional image file of non-generic components within the building.
The application system according to claim 8, further comprising a cloud file server based on the Internet cloud network, responsible for storing the three-dimensional image file of the building and the geographical location and name of the corresponding building.