CN106777816B

CN106777816B - Scene dynamic model management system

Info

Publication number: CN106777816B
Application number: CN201710035599.6A
Authority: CN
Inventors: 宋霏; 桑玮; 张颍; 于潇; 沈嘉琳; 张淑慧
Original assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Current assignee: Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Priority date: 2017-01-18
Filing date: 2017-01-18
Publication date: 2023-06-02
Anticipated expiration: 2037-01-18
Also published as: CN106777816A

Abstract

The invention provides a scene dynamic model management system, which comprises a data conversion part, a data storage part and a runtime part. The scene dynamic model management system provided by the invention can ensure that the model used in the virtual reality device is always up to date under the condition of allowing certain time delay because the occurrence of data conversion can be triggered according to the timing or the event of updating the data source.

Description

Scene dynamic model management system

Technical Field

The invention provides a basic framework for data and information for virtual reality application in nuclear power related industries, and particularly relates to a scene dynamic model management system based on a virtual reality technology.

Background

Virtual reality has been introduced into industrial production for many years as a means of effectively reducing design and experimental costs. Virtual reality technology can provide the designer with good interactive verification possibilities during the design phase of the product. The designer can quickly iterate and update the design content with reference to the results of the virtual verification without waiting for lengthy and expensive prototyping phases, thereby saving significant time and expense.

In the nuclear power industry, part of projects are built and updated with a three-dimensional model in a whole factory range as a conventional component part of a design period, so that the problem that traditional two-dimensional drawings and calculation books are difficult to process, such as equipment space interference among multiple professions, is solved. However, there have been difficulties and obstacles to applying virtual reality related systems to a wide range of substantial applications in large devices and complex industrial systems like nuclear power. One of the important reasons is that the current virtual reality belongs to targeted development application, and is rarely capable of providing a universal platform, and is disjointed from the main flow of design, so that the existing industrial application case display purpose is often more than practical implementation. The main reason for this problem is generally related to the difficulty in directly compatible platforms used by industrial designs with the technologies used by current virtual reality. Specifically, most platforms used in industrial designs are surface-based or solid-based specialized modeling systems, while rendering engines used in virtual reality can support substantially only polygonal geometries. In response to this problem, conventional virtual reality applications mostly perform manual or semi-manual data conversion, or even re-modeling, on design data during the application development phase. The disadvantages of this conversion are evident, in particular, in the industry where the number of such structures, systems and components is very large:

1) The single manual or semi-manual conversion is huge in data volume and prone to error.

2) The statically converted data cannot be updated following frequent updates of the design data. For example, in a nuclear power project, a new whole plant three-dimensional model is released every day, and a virtual reality model with a lag version cannot support design and verification work.

3) The polygon data itself can only contain limited information with practical significance, and more data information is difficult to associate.

4) Inaccuracy of polygon data is also an unacceptable problem in industrial applications, particularly when high accuracy operations such as measuring, constraining, etc. of the data are required in the application.

The virtual reality platform which cannot be efficiently updated according to the iteration speed of the design main flow cannot be associated with more design information except the three-dimensional model, and the usability in the industry is greatly compromised. The virtual reality platform with the dimension accuracy not guaranteed can not guarantee the verification result effectiveness generated by the virtual reality platform, and the virtual reality platform cannot be applied in the industry with high importance on safety such as nuclear power and strict design and control. The invention aims to realize large-scale, rapid and automatic conversion from a design model to a virtual reality model through a dynamic management method of the model, solves the problem of inaccurate polygon geometry of the virtual reality model, and paves the way for the practical application of the virtual reality technology in complex industry.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a scene dynamic model management system.

The scene dynamic model management system comprises a data conversion part, a data storage part and a runtime part; the data conversion part reads the original format of the design platform and converts the data according to the format which can be used by the used curved surface/entity processing engine; the curved surface/entity data, the polygon data and the interrelationships are respectively stored in the form of entity data files, polygon files and relational database data tables; when the virtual reality operates, the system queries index information of the original entity according to the source file, the vertex sequence number, the edge sequence number and the polygon sequence number of the polygon.

Preferably, before the original data are stored as entity data files, indexes are respectively added to the vertexes, boundaries and surfaces of the original curved surface/entity model; not only the vertex list and the polygon list but also the boundary line description list are saved in the polygon file.

Preferably, in the relational database, a relational table is established between the index added in the entity file and the vertex, boundary and polygon sequence numbers in the polygon file.

Preferably, the virtual reality application uses a dynamic link or process communication mode to call a curved surface calculation unit evolved by the entity engine in running, loads corresponding entity data, performs curved surface/entity related calculation as required, and feeds back the result to the virtual reality engine.

Preferably, the surface/entity data is converted into polygons by the processing engine and the relationship of the polygons to the original design data is recorded.

Preferably based on virtual reality technology.

Compared with the prior art, the invention has the following beneficial effects:

1. the scene dynamic model management system provided by the invention can ensure that the model used in the virtual reality application is always up to date under the condition of allowing certain time delay because the occurrence of data conversion can be triggered according to the timing or the event of data source updating.

2. The scene dynamic model management system provided by the invention can provide high-precision access and calculation for parameterized geometries such as curved surfaces/entities in the original design file by the virtual reality application.

3. The scene dynamic model management system provided by the invention can be used for associating the geometric bodies rich in description information and can strengthen the integration of a virtual reality system and various design data.

4. The scene dynamic model management system provided by the invention can be used as a component of a data part in a complete virtual reality system, provides a geometric body which is derived from an engineering data platform and can be browsed in real time, has accurate size information and can be associated with rich description information for each application of virtual reality, greatly improves timeliness, integrity, accuracy and precision of data sources in the traditional virtual reality application, establishes a dynamic bridge between an industrial design platform and the virtual reality application, and lays a foundation for application of virtual reality technology in complex industrial system design.

Drawings

FIG. 1 is a diagram of a scene dynamic model management system according to the present invention.

FIG. 2 is a graph showing the data relationship in the present invention.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.

The scene dynamic model management system provided by the embodiment consists of three parts, namely a conversion part, a data storage part and a runtime part, and the overall system structure diagram is shown in figure 1.

The data conversion section reads the original format of the design platform and converts the data in a format that can be used by the surface/entity processing engine used. The processing engine converts the curved surface/entity data into polygons, and records the relation between the polygons and the original design data, and the relation diagram is shown in fig. 2.

The curved surface/entity data, polygon data and interrelationships are stored in the form of entity data files, polygon files and relational database data tables, respectively.

Before the original data are stored as entity data files, indexes are respectively added to the vertexes, boundaries and surfaces of the original curved surface/entity model. Not only the vertex list and the polygon list but also the boundary line description list are saved in the polygon file. In the relational database, a relational table is established between indexes added in the entity file and the serial numbers of the vertexes, boundaries and polygons in the polygon file.

When the virtual reality operates, the system queries index information of the original entity according to the source file, the vertex sequence number, the edge sequence number and the polygon sequence number of the polygon. The virtual reality application uses dynamic link or process communication mode to call the curved surface calculation unit evolved by the entity engine in running time, loads corresponding entity data, calculates the relevant curved surface/entity according to the requirement, and feeds back the result to the virtual reality engine.

In this embodiment, the PDS system is taken as an original design platform of data, the main model file is DGN v7 format, and all design data of interest of the application is stored on a storage server as the actual platform data storage indicated in fig. 1- (1).

And establishing a service running in a period, and periodically scanning the updating condition in the catalog. When the model file is updated, a data conversion process is started, the DGN v7 format is read out and converted into the BREP format in the processing engine shown in the figure 1- (2), and the BREP format is stored in the curved surface/entity data storage shown in the figure 1- (3). The original sequence numbers of vertices, edges, and faces are used as indices in the BREP format. And simultaneously performing triangulation processing, performing triangulation processing on the surface and polygonal processing on the boundary, recording vertexes, polygonal edges and a triangular list, and storing the vertexes, the polygonal edges and the triangular list in a polygonal model storage shown in the (4) of fig. 1. The index number is recorded in a relational database (fig. 1- (5)) together with the entity file name, the polygon file name and the record of each model block are written in the relational database (fig. 1- (5)), and the association relation between the source entity part and the vertex sequence, the polygon sequence and the polygon edge in the polygon file is written in the relational database (fig. 1- (5)) according to the triangle formation of the surface and the polygon formation result of the boundary.

The virtual reality system engine (fig. 1- (6)) is used by Virtools 5.0, the curved surface calculation unit (fig. 1- (7)) implemented by a separate process running curved surface/entity processing engine is used, and data communication is performed by using a UDP method. Virtools finds the model block to be processed through a ray intersection mode, and obtains the model name (containing source file information) and the face sequence number. And submitting the two pieces of information to a curved surface processing unit, and querying a database by the processing unit to retrieve the section containing the triangle sequence number in the range of the model block of the file from the source. And finding out the original related BREP file, loading the file, and positioning entity elements according to the entity index obtained by searching before for calculation. Returning the result to Virtools to complete the whole operation process.

As shown in FIG. 1, the system consists of three parts, namely data conversion, data storage and runtime, wherein the data conversion is frequently executed when the design data is updated so as to ensure that the converted result is always up-to-date. The data storage section permanently stores the converted result. The runtime component operates in conjunction with the virtual reality system, complicating the processing of requests for surface/entity operations by applications.

Compared with the prior art, the embodiment has the following beneficial effects:

1. according to the scene dynamic model management system provided by the embodiment, because the occurrence of data conversion can be triggered according to the timing or the event of data source updating, the model used in the virtual reality application can be ensured to be always up to date under the condition of allowing certain time delay.

2. The scene dynamic model management system provided by the embodiment can provide high-precision access and calculation of parameterized geometries such as curved surfaces/entities in the original design file by the virtual reality application.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, the description is relatively simple because of corresponding to the method disclosed in the embodiment, and the relevant points refer to the description of the method section.

Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not intended to be limiting.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A scene dynamic model management system, which is characterized by comprising a data conversion part, a data storage part and a runtime part; when the model file is updated, starting a data conversion process, wherein the data conversion part reads the original format of the design platform, converts data according to the format which can be used by the used curved surface/entity processing engine, converts the curved surface/entity data into a polygon by the curved surface/entity processing engine, and records the relation between the polygon and the original design data; the curved surface/entity data, the polygon data and the interrelationships are respectively stored in a mode of entity data files, polygon files and database data tables; before the original data is stored, indexes are respectively added to the vertexes, boundaries and surfaces of the original curved surface/entity model; in a database, establishing a relation table between indexes added in the entity file and the vertex, boundary and polygon sequence numbers in the polygon file; when the virtual reality device operates, the system queries index information of an original entity according to a source file, a vertex sequence number, a boundary sequence number and a polygon sequence number of the polygon; and loading corresponding entity data according to the index information.

2. The scene dynamic model management system according to claim 1, wherein not only the vertex list and the polygon list but also the boundary line description list are saved in the polygon file.

3. The system according to claim 1, wherein the virtual reality device uses a curved surface calculation unit evolved by a dynamic link or communication call run-time entity engine to load corresponding entity data, performs curved surface/entity related calculation as required, and feeds back the result to the virtual reality engine.