CN114138385A

CN114138385A - BIM model display method and device, computer equipment and storage medium

Info

Publication number: CN114138385A
Application number: CN202111315586.7A
Authority: CN
Inventors: 黄抒艺; 梁华光; 邹学通; 陈新民; 程奕玮; 袁培辙; 张琰; 张玮珊; 陆树娜
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-03-04

Abstract

The application relates to a BIM model display method, a BIM model display device, a BIM model display storage medium and a BIM model display computer program product. The method comprises the following steps: sending a model access request to an agent terminal, wherein the model access request comprises a model identifier of a BIM to be accessed, receiving a BIM model file corresponding to the model identifier sent by the agent terminal, and displaying the BIM to be accessed based on an OpenGL ES technology and the BIM model file. By adopting the method, the BIM to be accessed can be displayed on the terminal, so that the problem that the BIM cannot be displayed on the terminal can be solved.

Description

BIM model display method and device, computer equipment and storage medium

Technical Field

The present application relates to the field of BIM model display technologies, and in particular, to a BIM model display method, apparatus, computer device, storage medium, and computer program product.

Background

The Building Information Modeling (BIM) model is a virtual Building engineering three-dimensional model, is established on the basis of various relevant Information data of a Building engineering project, and simulates real Information of a Building through digital Information.

At present, a demand exists for displaying a BIM model on a computer device or a terminal, and for the computer device, an ACTIVEX plug-in needs to be installed on the computer device first, and the computer device acquires a BIM model file from a server, renders the BIM model file based on the BIM model file, and displays the BIM model on a webpage.

However, a method capable of displaying the BIM model on the terminal is not provided, and thus how to display the BIM model on the terminal becomes a problem of intensive research.

Disclosure of Invention

In view of the above, it is necessary to provide a BIM model display method, apparatus, computer device, computer readable storage medium and computer program product capable of displaying a BIM model on a terminal in view of the above technical problems.

In a first aspect, the present application provides a BIM model display method. The method comprises the following steps:

sending a model access request to an agent terminal, wherein the model access request comprises a model identifier of a BIM to be accessed;

receiving a BIM model file corresponding to the model identification sent by the agent terminal;

and displaying the BIM to be accessed based on the OpenGL ES technology and the BIM model file.

In one embodiment, displaying the to-be-accessed BIM model based on the OpenGL ES technology and the BIM model file includes:

analyzing the BIM model file based on the OpenGL ES technology to obtain the information of the top point of the BIM model to be accessed;

assembling the vertexes of the BIM model to be accessed into a primitive according to the information of the vertexes;

performing rasterization processing on the primitive to obtain a rasterized primitive;

and processing the rasterized primitive to obtain the BIM model to be accessed, and displaying the BIM model to be accessed.

In a second aspect, the present application provides another BIM model display method. The method comprises the following steps:

receiving a model access request sent by a terminal, wherein the model access request comprises a model identifier of a BIM to be accessed;

and if the agent end stores the BIM model file corresponding to the model identification, sending the BIM model file to the terminal.

In a third aspect, the present application further provides a BIM model display device. The device comprises:

the request module is used for sending a model access request to the agent terminal, wherein the model access request comprises a model identifier of a BIM to be accessed;

the receiving module is used for receiving the BIM model file corresponding to the model identification sent by the agent terminal;

and the display module is used for displaying the BIM to be accessed based on the OpenGL ES technology and the BIM model file.

In a fourth aspect, the present application further provides a computer device. The computer device comprises a memory storing a computer program and a processor implementing the steps of any of the methods described above when the processor executes the computer program.

In a fifth aspect, the present application further provides a computer-readable storage medium. The computer-readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of any of the methods described above.

In a sixth aspect, the present application further provides a computer program product. The computer program product comprising a computer program which when executed by a processor implements the steps of any of the methods described above.

According to the BIM display method, the BIM display device, the computer equipment, the storage medium and the computer program product, the model access request is sent to the agent terminal, wherein the model access request comprises the model identification of the BIM to be accessed, the BIM model file corresponding to the model identification sent by the agent terminal is received, and the BIM to be accessed is displayed based on the OpenGL ES technology and the BIM model file. Because the terminal in the embodiment of the invention cannot install the ACTIVEX plug-in as the computer equipment, the BIM model cannot be displayed. In this embodiment, through interaction between the agent and the terminal, the terminal may receive the BIM model file corresponding to the model identifier sent by the agent, and display the to-be-accessed BIM model on the terminal based on the OpenGL ES technology and the BIM model file, so that the problem that the BIM model cannot be displayed on the terminal can be solved.

Drawings

FIG. 1 is a diagram of an application environment of a BIM model display method in an embodiment of the present application;

fig. 2 is a schematic flowchart of a BIM model display method provided in an embodiment of the present application;

fig. 3 is a schematic flowchart of a to-be-accessed BIM model display method provided in an embodiment of the present application;

FIG. 4 is a topology diagram of an application environment in an embodiment of the present application;

fig. 5 is an interaction diagram of a cache pool and an agent side provided in the embodiment of the present application;

FIG. 6 is a schematic flow chart illustrating another BIM display method provided in the embodiments of the present application;

fig. 7 is a schematic flowchart of a BIM model obtaining method provided in an embodiment of the present application;

fig. 8 is a schematic structural diagram of a BIM model display device provided in an embodiment of the present application;

fig. 9 is a schematic structural diagram of another BIM model display device provided in the embodiment of the present application;

fig. 10 is an internal structural diagram of a computer device in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Fig. 1 is an application environment diagram of a BIM model display method in an embodiment of the present application, and referring to fig. 1, the BIM model display method provided in the embodiment of the present application may be applied to the application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network. The data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104, or may be located on the cloud or other network server. The terminal 102 may be, but is not limited to, various devices with application software (APP), such as a smart phone and a tablet computer. The server 104 may be implemented as a stand-alone server or as a server cluster comprised of multiple servers.

Fig. 2 is a schematic flow chart of a BIM model display method provided in an embodiment of the present application. The method may be applied to a terminal as shown in fig. 1, and in one embodiment, as shown in fig. 2, comprises the following steps:

s201, sending a model access request to the agent terminal, wherein the model access request comprises a model identifier of the BIM to be accessed.

In this embodiment, the agent relies on a Progressive WEB Application (PWA), the PWA is a cross-platform Application created by applying a modern WEB Application Programming Interface (API) and a traditional Progressive enhancement policy, and user experience similar to that of the native APP is realized by various WEB technologies. The agent end acts between the terminal and the server and is a script which operates independently based on a Service Work mechanism.

It should be noted that the agent may be deployed on the server shown in fig. 1, or the agent may be separately deployed on other servers or devices.

The proxy end is provided with a corresponding cache pool, the cache pool of the proxy end stores the BIM model file requested by the user and the corresponding model identification thereof, the proxy end receives the model access request sent to the terminal by the user, the request comprises the model identification of the BIM model to be accessed, and the proxy end searches the BIM model to be accessed corresponding to the model identification in the cache pool according to the model identification of the BIM model to be accessed, namely confirms the corresponding BIM model file according to the model identification and sends the corresponding BIM model file to the terminal.

S202, receiving a BIM model file corresponding to the model identification sent by the agent terminal.

In this embodiment, the terminal receives a BIM model file corresponding to the model identifier sent by the agent, where the BIM model file is a BIM model file after weight reduction processing in the server. Or, the terminal receives the BIM model file which is not subjected to the server weight reduction processing and is sent by the proxy, which is not limited in this embodiment.

And S203, displaying the BIM to be accessed based on the OpenGL ES technology and the BIM model file.

In this embodiment, the terminal displays the BIM model to be accessed based on the OpenGL ES technology and the received BIM model file. OpenGL ES (OpenGL for Embedded Systems) is a subset of OpenGL, which is a three-dimensional graphics application program interface, and is designed for Embedded devices such as mobile phones, PDAs, and game hosts. OpenGL ES is customized from OpenGL, and removes many non-absolutely necessary characteristics such as complex primitives like glBegin/glEnd, quadrilateral (GL _ qualds), polygon (GL _ polygon), etc., so that terminal application developers, such as APP developers, can display BIM model files on the mobile device.

The terminal in this embodiment may analyze the BIM model file to obtain information of a vertex of the BIM model to be accessed based on an OpenGL ES technology, assemble the vertex of the BIM model to be accessed into a primitive according to the information of the vertex, perform rasterization on the primitive to obtain a primitive after rasterization, process the primitive after rasterization to obtain the BIM model to be accessed, and display the BIM model to be accessed.

In the BIM model display method provided in this embodiment, a model access request is sent to an agent, where the model access request includes a model identifier of a to-be-accessed BIM model, a BIM model file corresponding to the model identifier sent by the agent is received, and the to-be-accessed BIM model is displayed based on an OpenGL ES technology and the BIM model file. Since the terminal in this embodiment cannot install the ACTIVEX plug-in as in a computer device, the BIM model cannot be displayed. In this embodiment, through interaction between the agent and the terminal, the terminal may receive the BIM model file corresponding to the model identifier sent by the agent, and display the to-be-accessed BIM model on the terminal based on the OpenGL ES technology and the BIM model file, so that the problem that the BIM model cannot be displayed on the terminal can be solved.

Fig. 3 is a schematic flow diagram of a to-be-accessed BIM model display method provided in an embodiment of the present application, and referring to fig. 3, this embodiment relates to an optional implementation of how to display a to-be-accessed BIM model based on an OpenGL ES technology. On the basis of the foregoing embodiment, the foregoing S203 specifically includes the following steps:

s301, analyzing the BIM model file based on the OpenGL ES technology to obtain information of the top point of the BIM model to be accessed.

In this embodiment, the terminal parses the BIM model file based on the OpenGL ES technology to obtain information of a Vertex of the BIM model to be accessed, where the information of the Vertex may be stored in a Vertex Buffer Object (VBO) or a Vertex Array Object (VAO), for example. The VBO is a memory buffer area opened up at the terminal and used for storing various attribute information of the vertex, such as vertex coordinates, vertex normal vectors, vertex color data, and the like. VBO holds vertex attribute information of a model, and binding all information of vertices is required before rendering the model, and when the amount of data is large, it becomes very troublesome to repeat such an action. The VAO may store all of these configurations in one object, and each time the model is drawn, only the VAO object needs to be bound. The VAO is a state combination which stores all vertex data attributes, the format of vertex information and references of VBO objects required by the vertex information are stored, the VAO is equivalent to the references of a plurality of VBOs, and the VBOs are combined together to be uniformly managed as one object.

And S302, assembling the vertexes of the BIM model to be accessed into the primitives according to the information of the vertexes.

In this embodiment, a Vertex Shader (Vertex Shader) is a program that processes Vertex information provided by VBO/VAO, and the input of the Vertex Shader includes:

a shader program: vertex shader program source code or executable files that describe operations performed on vertices; the vertex shader inputs: data for each vertex provided by the vertex array; uniform variable (uniform): invariant data used by the vertex/fragment shader; samplers (Samplers): a special uniform variable type representing texture used by the vertex shader.

Therefore, each vertex provided by VBO/VAO executes the shader program of the vertex shader once, the uniform variable Uniforms is consistent at each vertex, the input vertex attributes are different at each vertex, and thus, executing the vertex shader once will output a variable Varying) and a built-in variable gl _ positon, etc.

The input of the 3D model BIM model into the terminal is a series of three-dimensional vertices, which need to be converted into two-dimensional coordinates that can be seen on the 2D screen of the terminal, so a conversion process of converting three-dimensional coordinates into two-dimensional coordinates is required, and the coordinate types involved in the conversion process are four: model coordinate Space (Object Space), World coordinate Space (World Space), observation coordinate Space (Eye Space), and screen coordinate Space (Clip and Project Space). The conversion steps are as follows:

converting model coordinate space data in the vertex information into world coordinate space data; converting world coordinate space data in the vertex information into observation coordinate space data; world coordinate space data in the vertex information is converted into observation coordinate space data.

The type of coordinate data in the vertex information in the BIM model file is the model coordinate space, for example, a BIM model file of type MAX is modeled by 3D MAX and derived, and the coordinate data contained in the file is the model coordinate space type. The model coordinate space has no reference relation with any object, and is equivalent to a specific position relative to the origin of coordinates represented by coordinates thereof, but the terminal needs to use a relative coordinate position, so that the model coordinate space in the vertex information needs to be converted into a world coordinate space.

Converting the model coordinate space data in the vertex information into world coordinate space data, and converting the vertex normal vector in the model coordinate space into the world coordinate space by using an inverse matrix of a world matrix (world matrix), wherein the world matrix can be a fourth-order matrix. The conversion process also includes illumination calculation, etc., and the specific conversion method is not particularly limited in this embodiment.

The world coordinate space data in the vertex information is converted into the observation coordinate space data, so that the world can be observed by each person with own eyes, the eyes equivalently construct an observation coordinate space, and similarly, the display of the BIM model by the terminal is also displayed from a certain observation visual angle, so that the world coordinate space in the vertex information needs to be converted into the observation coordinate space.

The observation coordinate space is a trapezoidal three-dimensional space formed by the viewpoint as the origin, the direction of the line of sight, the range of the viewing angle, and the far and near planes, and can be called as a viewing cone (viewing cone). The viewpoint is equivalent to human eyes, a video camera can be arranged in the terminal, the terminal can use an orthogonal projection camera, the obtained result is geometrically drawn effect, and the projection of parallel lines in a three-dimensional space into a two-dimensional space is also necessarily parallel; the terminal may also use a perspective projection camera, and the result obtained is an effect similar to the "near-far-small" effect that the human eye sees in the real world. In this embodiment, a perspective projection camera is used, and objects that are out of this trapezoidal range are rejected during subsequent processing, which is known as viewing cone cropping (Furstum Culling).

And converting the world coordinate space data in the vertex information into observation coordinate space data, namely mapping the coordinate data obtained in the process to a screen coordinate system, thereby finishing the display of the BIM model of the subsequent terminal.

In this embodiment, the vertex information is then Primitive assembled (primative Assembly) to assemble the vertex information output by the vertex shader into a Primitive. The primitive (speculative) includes points, line segments, triangles and the like, and is a basic unit for forming the BIM model. For each primitive, the part of the primitive that is not within the view frustum (i.e., the area visible to the terminal screen) is discarded.

More specifically, the data in the vertex information is restored to a mesh structure according to the original linking relation, the mesh is composed of vertices and indexes, the vertices are linked together according to the indexes of the mesh structure at this stage, the vertex information output by a vertex shader is combined into three different primitives of points, lines and surfaces, then the primitives beyond the projection of a perspective projection camera are subjected to cone clipping, for example, for a triangle ABC, one vertex of the three vertices is not located inside the cone, the other two vertices are located inside the cone, a quadrangle is actually seen on a terminal screen, and then the quadrangle is cut into 2 small triangles. And after the primitive is clipped by the viewing cone, converting the vertex position into a screen coordinate, and performing the next rasterization stage.

And S303, performing rasterization processing on the primitive to obtain the rasterized primitive.

In this embodiment, the primitive obtained in S302 is subjected to Rasterization (Rasterization), which is a process of converting the primitive into a two-dimensional Fragment, that is, pixelation, and the primitive is mapped to a pixel point of a grid on a screen, so that the two-dimensional Fragment represents a pixel that can be drawn on the screen, and a Fragment (Fragment) for subsequent Fragment shader processing is generated.

And S304, processing the rasterized graphics primitive to obtain a BIM model to be accessed, and displaying the BIM model to be accessed.

In this embodiment, the rasterized primitive is a fragment, the rasterized fragment executes a fragment shader (fragment shader), the fragment shader may discard the fragment and may also generate a color value for the fragment, the fragment shader generally outputs only one color value, and when rendering multiple targets, the fragment shader outputs one color value for each rendering target.

The process of processing the rasterized primitive may include performing a fragment-by-fragment operation on the color, depth, template, and screen coordinates generated after the rasterization process. The Per-Fragment Operations (Per-Fragment Operations) are Operations performed on each Fragment to determine the data that needs to be finally merged into the buffer, such as depth tests, stencil tests, and the like, which are all test methods inside the open ES, and these test steps determine the visibility of each Fragment, and if a Fragment passes all the tests, the color value of the Fragment needs to be merged or mixed with the color already stored in the color buffer to determine the final display effect.

The BIM model display method to be accessed provided in this embodiment is based on the OpenGL ES technology, and is configured to parse a BIM model file to obtain information of vertices of a BIM model to be accessed, assemble the vertices of the BIM model to be accessed into primitives according to the information of the vertices, perform rasterization on the primitives to obtain the primitives after the rasterization, process the primitives after the rasterization to obtain the BIM model to be accessed, and display the BIM model to be accessed. Since the terminal in this embodiment cannot install the ACTIVEX plug-in as in a computer device, the BIM model cannot be displayed. In this embodiment, through interaction between the agent and the terminal, the terminal may receive the BIM model file corresponding to the model identifier sent by the agent, and display the to-be-accessed BIM model on the terminal based on the OpenGL ES technology and the BIM model file, so that the problem that the BIM model cannot be displayed on the terminal can be solved.

Optionally, the to-be-accessed BIM model may also be obtained based on the rasterized primitive, and the to-be-accessed BIM model is displayed.

Optionally, the above S202 may be implemented as follows:

receiving a BIM model file which is subjected to light weight processing and corresponds to the model identification sent by the agent terminal;

the BIM model file after the weight reduction processing is a model file stored by the agent end or a model file received by the agent end and sent by a server.

Fig. 4 is a topological diagram of an application environment in an embodiment of the present application, and fig. 5 is an interaction diagram of a cache pool and an agent terminal provided in the embodiment of the present application, please refer to fig. 4 and fig. 5, in this embodiment, if a terminal first sends a model access request to the agent terminal, and a BIM model file requested by the model access request is first requested by the terminal, the cache pool of the agent terminal does not have the BIM model file, so the agent terminal sends the model access request to a server, where the model access request includes a model identifier of a to-be-accessed BIM model. The server determines a BIM to be accessed according to the model identification of the BIM, carries out light-weight processing on the BIM file, then sends the BIM file after the light-weight processing to the proxy end, and the proxy end stores the BIM file after the light-weight processing and the corresponding model identification in a cache pool and sends the BIM file after the light-weight processing to the terminal.

If the terminal does not send a model access request for the first time, and the BIM model file requested by the model access request is requested by the terminal before, when the first request is cached in the cache pool of the proxy end, the server sends the lightweight processed BIM model file to the proxy end, so that the proxy end determines the lightweight processed BIM model file according to the model identification including the BIM to be accessed and sends the lightweight processed BIM model file to the terminal, the proxy end does not need to send the model access request to the server, but the proxy end directly sends the cached lightweight processed BIM model file to the terminal, as can be seen from FIG. 5, the model identifications in the cache pool correspond to the BIM model files one by one, therefore, when the proxy end can quickly determine the corresponding BIM model file in the cache pool according to the model identification in the request and respond to the request, and sending the BIM model file to the terminal, thereby improving the efficiency of acquiring the BIM model file by the terminal.

It should be noted that, because hardware resources of a terminal, such as a mobile phone, are limited, how to display the BIM model using less resources becomes a problem for those skilled in the art to study. In this embodiment, the volume of the BIM model file can be reduced by reducing the volume of the BIM model file, and thus the BIM model can be displayed by occupying less resources.

In this embodiment, the BIM model file after the weight reduction process corresponding to the model identifier sent by the agent end is received, where the BIM model file after the weight reduction process is the model file stored by the agent end itself or the model file sent by the server received by the agent end, and since the BIM model files sent to the terminal are all the BIM model files after the weight reduction, the volume of the BIM model file is reduced, therefore, the efficiency of obtaining the BIM model file by the terminal can be further improved, and the efficiency of displaying the BIM model file by the terminal can be improved.

Fig. 6 is a schematic flow diagram of another BIM model display method provided in this embodiment of the present application, where the BIM model display method provided in this embodiment may be applied to a proxy side, and the method may be implemented in the following manner, with reference to fig. 6, and specifically includes the following steps:

s601, receiving a model access request sent by a terminal, wherein the model access request comprises a model identifier of a BIM to be accessed.

In this embodiment, the terminal sends a BIM model access request to the agent, and the model identifier of the to-be-accessed BIM model is used to identify the to-be-accessed BIM model file in the agent.

And S602, if the agent end stores the BIM model file corresponding to the model identification, sending the BIM model file to the terminal.

In this embodiment, the proxy end has a corresponding cache pool, and the proxy end searches whether a corresponding model identifier of the BIM model exists in the cache pool according to the model identifier of the BIM model to be accessed, and if the cache pool of the proxy end stores the model identifier of the BIM model to be accessed, the proxy end can determine the corresponding BIM model file to be accessed according to the model identifier of the BIM model to be accessed, and send the BIM model file to the terminal.

According to the BIM model display method provided by the embodiment, the model access request sent by the terminal is received, wherein the model access request comprises the model identification of the BIM model to be accessed, if the BIM model file corresponding to the model identification is stored in the agent end, the BIM model file is sent to the terminal, and due to the interaction between the agent end and the terminal, the terminal receives the BIM model file corresponding to the model identification sent by the agent end and displays the BIM model to be accessed, so that the problem that the BIM model cannot be displayed on the terminal is solved.

Fig. 7 is a schematic flow diagram of a BIM model obtaining method provided in this embodiment of the present application, where the BIM model displaying method provided in this embodiment may be applied to a proxy side, and the method may be implemented in the following manner, with reference to fig. 7, and specifically includes the following steps:

and S701, if the agent end does not store the BIM model file corresponding to the model identification, sending the model access request to a server.

In this embodiment, the proxy end searches whether a corresponding model identifier of the BIM model exists in the cache pool according to the model identifier of the BIM model to be accessed, and if the cache pool of the proxy end stores no model identifier of the BIM model to be accessed, this indicates that the BIM model to be accessed requests access to the terminal for the first time, and the proxy end sends a model access request to the server.

S702, receiving a BIM model file corresponding to the model identification sent by the server.

In this embodiment, the server has pre-stored all the BIM model files of the user, the server receives the BIM model access request sent by the proxy, the model identifier of the to-be-accessed BIM model is used to identify the to-be-accessed BIM model file in the server, and the server can determine the to-be-accessed BIM model file corresponding to the model identifier of the to-be-accessed BIM model according to the model identifier of the to-be-accessed BIM model.

The server can perform lightweight processing on the BIM model file to be accessed and send the BIM model file after the lightweight processing to the agent terminal, so that the terminal receives and displays the BIM model file after the lightweight processing, or the server can directly send the BIM model file corresponding to the model identification to the agent terminal, so that the terminal receives and displays the BIM model file after the lightweight processing, and the BIM model file sent by the server is not limited.

And S703, sending the BIM model file to the terminal.

In this embodiment, after determining the to-be-accessed BIM model file corresponding to the model identifier of the to-be-accessed BIM model, the server sends the to-be-accessed BIM model file to the proxy, and the proxy sends the to-be-accessed BIM model file to the terminal, and stores the to-be-accessed model identifier and the to-be-accessed model file into the corresponding cache pool, so that when the terminal requests the BIM model file for the second time, the proxy can directly find the BIM model file in the cache pool according to the model identifier of the to-be-accessed BIM model and send the BIM model file to the terminal.

In the BIM model display method provided in this embodiment, if the proxy end itself does not store the BIM model file corresponding to the model identifier, the model access request is sent to the server, and the BIM model file corresponding to the model identifier sent by the server is sent to the terminal, and since the BIM model to be accessed and the corresponding model identifier are stored in the cache pool of the proxy end when the request is made for the first time, when one BIM model file is requested to be accessed again by the terminal, the proxy end can determine the corresponding BIM model file according to the model identifier and send the BIM model file to the terminal, and no request is required to be made to the server, so that the request and download speed of the BIM model file are increased, and the subsequent display efficiency is improved.

Optionally, the above S702 may be implemented as follows:

and receiving the BIM model file which is subjected to the light weight processing and corresponds to the model identification and is sent by the server, wherein the BIM model file subjected to the light weight processing is geometric data obtained after the server performs digital-analog separation on the BIM model file corresponding to the model identification, and the model file is obtained after the light weight processing.

In this embodiment, after the server confirms that the BIM model file to be accessed corresponding to the model identifier of the accessed BIM model is accessed, the server performs a weight reduction process on the BIM model file to obtain a light-weighted BIM model file, and the weight reduction process of the BIM model file by the server includes the following steps:

carrying out digital-analog separation on the BIM model file; and performing at least one of parameterization processing, triangulation processing, similarity processing and compression processing on the three-dimensional geometric data separated by the digital-analog separation.

The BIM model file comprises three-dimensional geometric data, model structure attributes and other non-geometric data. First, the BIM model file needs to be split into geometric data and non-geometric data through digital-analog separation. By this process, about 20% -50% of the non-geometric data in the original BIM model file is stripped out. The geometry data may be three-dimensional geometry data or may include two-dimensional geometry data.

The three-dimensional geometric data in the BIM model file refers to three-dimensional triangular mesh (triangular mesh) or three-dimensional linear mesh (polyline mesh), wherein each mesh is composed of a vertex array and an index array. The parameterization or triangulation processing method is to convert mesh into a nurbs or other parameter expression modes, and for the surfaces with easily expressed parameters, such as spheres, the data volume is greatly reduced by the mode. The parameterization or triangulation processing method can be realized by the following method:

the first method is as follows: remeshing, namely, resampling the mesh to form a new mesh;

the second method comprises the following steps: tessellation (subdivisions), i.e., subdividing a surface to generate a more complex surface, is essentially to generate a b-spline surface with the original surface as a control point.

The third method comprises the following steps: the structure generated by using an extreme operation in a pipeline and the like in the BIM model file can be expressed by a path and a cross section. The effect of data compression is even more pronounced if the cross-section is of a convenient formulaic shape, such as circular. To further reduce the workload of the terminal to expand the shape expressed by such parameters into mesh, the sampling points in the path (path) can be calculated in advance.

In this embodiment, the parameterization or triangulation processing may be performed in the first or second mode, or may also be performed in all the modes described above, and the processing method of the parameterization or triangulation processing is not limited in this embodiment.

The similarity processing may be implemented as follows:

the server identifies a reference graph in the geometric data, wherein the reference graph can be a triangle, a rectangle or a square; determining similar patterns in the reference patterns, wherein many components in the BIM model file have the same structure and are different in positions or angles, and the components are identified as similar; the server carries out merging simplification processing on the data of the similar graphs, namely: data for only one building block is retained, and other similar building blocks are labeled by the form "reference + spatial coordinates".

The compression process may be implemented as follows:

the first method is as follows: the server compresses the geometric data by using a Draco library of Google;

the second method comprises the following steps: the server stores the BIM model file data after gzip compression, because the browser supports the gzip decompression during the transmission process or the gzip compression data, and when the application layer is the decompressed model data, the gzip compression rate is 2:1, for example, and the compressed data can be compressed to half the size of the original data of the BIM model file.

In this embodiment, the compression processing may be performed in the first mode or the second mode, or may be performed only in the first mode, and the compression processing method is not limited in this embodiment.

In this embodiment, the server performs weight reduction on the BIM model file, for example, the BIM model file may be subjected to parameterization to obtain a parameterized BIM model file, the parameterized BIM model file is compressed, and the compressed BIM model file is used as the model file after weight reduction, and a specific method of the weight reduction is not limited in this embodiment.

The number of bulky BIM model components can be very large and downloading and loading these components in their entirety in the terminal can affect the download and loading speed. At the same time, the field of view or scene for viewing the BIM model is relatively limited. Therefore, in this embodiment, by using the above features, a multi-level component system conforming to the scene distance principle may be created, where the proxy receives a distance from a current viewpoint sent by the terminal to the BIM model to be accessed, determines a light-weighted BIM model file corresponding to the distance from a corresponding relationship, and sends the light-weighted BIM model file corresponding to the distance to the terminal, where the corresponding relationship includes a corresponding relationship between different distances and different light-weighted BIM model files.

In this embodiment, the agent determines the BIM model file after the weight reduction process corresponding to the distance from the correspondence relationship. If the distance from the current viewpoint to the BIM to be accessed is a long distance, the agent end obtains a corresponding BIM model file after lightweight processing, and the BIM model file is used for displaying a panoramic BIM; and if the distance from the current viewpoint to the BIM to be accessed is a short distance, the agent end acquires the corresponding BIM model file after the lightweight processing, and the BIM model file is used for displaying the detail information of the BIM.

In this embodiment, if the distance from the current viewpoint to the BIM model to be accessed is a long distance, the agent end obtains the corresponding lightweight-processed BIM model file about the panorama and sends the panoramic BIM model file to the terminal, so that when a user using the terminal browses the BIM model in a long distance, the user does not pay attention to specific details of components on the BIM model file, in this case, the agent end does not need to send the BIM model file for displaying detailed information to the terminal, and the terminal only receives the panoramic BIM model file sent by the agent end, so that the data volume of the BIM model received by the terminal is reduced, and the efficiency of loading the BIM model file by the terminal is improved; if the distance from the current viewpoint to the BIM model to be accessed is reduced, namely the distance from the current viewpoint to the BIM model to be accessed is a short distance, the agent end acquires the corresponding BIM model file which is subjected to light weight processing and is related to the detailed information and sends the BIM model file to the terminal, therefore, when a user using the terminal observes the BIM model in a short distance, the user needs to see the details of the BIM model component instead of seeing the panorama of the BIM model, under the condition, the agent end sends the BIM model file for displaying the detailed information to the terminal, and the terminal only receives the BIM model file which is sent by the agent end and is used for displaying the detailed information of the BIM model, so that the data volume of the BIM model received by the terminal is reduced, and the efficiency of loading the BIM model file by the terminal is improved.

According to the embodiment, the BIM model file which is subjected to light weight processing and corresponds to the distance from the current viewpoint to the BIM model to be accessed is determined to be sent to the terminal, so that the loading speed of the BIM model file on the terminal is increased, and the display speed of the BIM model is increased.

In this embodiment, the BIM model file after the weight reduction processing corresponding to the model identifier sent by the server is received, where the BIM model file after the weight reduction processing is geometric data obtained by performing digital-analog separation on the BIM model file corresponding to the model identifier by the server, and the model file obtained after the weight reduction processing is performed, because the BIM model file received by the terminal is a model file obtained by performing weight reduction processing by using at least one of parameterization processing, triangularization processing, similarity processing, and compression processing, the volume of the BIM model file is reduced, thereby reducing the time required for transmitting the BIM model file and the time required for loading the BIM model file by the terminal, avoiding the problem of memory overflow, and effectively improving the efficiency of loading and rendering the BIM model file by the terminal.

It should be understood that, although the steps in the flowcharts related to the embodiments as described above are sequentially displayed as indicated by arrows, the steps are not necessarily performed sequentially as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the flowcharts related to the embodiments described above may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the execution order of the steps or stages is not necessarily sequential, but may be rotated or alternated with other steps or at least a part of the steps or stages in other steps.

Based on the same inventive concept, the embodiment of the application also provides a BIM model display device for realizing the BIM model display method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the method, so that specific limitations in one or more embodiments of the BIM model display device provided below can be referred to the limitations on the BIM model display method in the above, and details are not repeated herein.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a BIM model display device provided in an embodiment of the present application, where the device 800 includes: a sending module 801, a receiving module 802 and a display module 803, wherein:

a sending module 801, configured to send a model access request to the agent, where the model access request includes a model identifier of a to-be-accessed BIM model.

The receiving module 802 is configured to receive a BIM model file corresponding to the model identifier sent by the agent.

The display module 803 is configured to display the to-be-accessed BIM model based on the OpenGL ES technology and the BIM model file.

The BIM model display device provided in this embodiment sends a model access request to an agent, where the model access request includes a model identifier of a to-be-accessed BIM model, receives a BIM model file corresponding to the model identifier sent by the agent, and displays the to-be-accessed BIM model based on an OpenGL ES technology and the BIM model file. In this embodiment, through interaction between the agent and the terminal, the terminal may receive the BIM model file corresponding to the model identifier sent by the agent, and display the to-be-accessed BIM model on the terminal based on the OpenGL ES technology and the BIM model file, so that the problem that the BIM model cannot be displayed on the terminal can be solved.

Optionally, the display module 803 is specifically configured to analyze the BIM model file based on the OpenGL ES technology to obtain information of a vertex of the BIM model to be accessed; assembling the vertexes of the BIM model to be accessed into primitives according to the information of the vertexes; performing rasterization processing on the primitive to obtain a rasterized primitive; and processing the primitive after rasterization processing to obtain a BIM model to be accessed, and displaying the BIM model to be accessed.

Optionally, the receiving module 802 is specifically configured to receive a lightweight BIM model file corresponding to the model identifier sent by the agent; the BIM model file after the weight reduction processing is a model file stored by the agent end or a model file received by the agent end and sent by a server.

Referring to fig. 9, fig. 9 is a schematic structural diagram of another BIM model display device provided in the embodiment of the present application, where the device 900 includes: a first receiving module 901 and a first transmitting module 902, wherein:

a first receiving module 901, configured to receive a model access request sent by a terminal, where the model access request includes a model identifier of a to-be-accessed BIM model.

The first sending module 902 is configured to send the BIM model file to the terminal if the proxy itself stores the BIM model file corresponding to the model identifier.

The BIM model display device provided in this embodiment sends a model access request to a terminal by receiving the model access request sent by the terminal, where the model access request includes a model identifier of a to-be-accessed BIM model, and sends the BIM model file to the terminal if the proxy itself stores the BIM model file corresponding to the model identifier. Due to the fact that the terminal receives the BIM model file corresponding to the model identification sent by the agent terminal and displays the BIM model to be accessed through interaction of the agent terminal and the terminal, the problem that the BIM model cannot be displayed on the terminal is solved.

Optionally, the BIM model display apparatus 900 may further include:

and the second sending module is used for sending the model access request to the server if the agent end does not store the BIM model file corresponding to the model identifier.

And the second receiving module is used for receiving the BIM model file corresponding to the model identifier sent by the server.

And the third sending module is used for sending the BIM model file to the terminal.

Optionally, the second receiving module is specifically configured to receive a lightweight BIM model file corresponding to the model identifier sent by the server, where the lightweight BIM model file is geometric data obtained by performing digital-analog separation on the BIM model file corresponding to the model identifier by the server, and the lightweight BIM model file is obtained by performing lightweight processing.

The modules in the BIM model display device may be wholly or partially implemented by software, hardware, or a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.

Fig. 10 is an internal structural diagram of a computer device in an embodiment of the present application, and in the embodiment of the present application, a computer device is provided, where the computer device may be a terminal or a server, and an internal structural diagram of the computer device may be as shown in fig. 10. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a BIM model display method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.

Those skilled in the art will appreciate that the architecture shown in fig. 10 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

In one embodiment, a computer device is provided, which includes a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the mobile energy storage system scheduling method provided in the foregoing embodiment when executing the computer program. The implementation principle and technical effect are similar to those of the above method embodiments, and are not described herein again.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, implements the steps of the mobile energy storage system scheduling method provided by the above-mentioned embodiments. The implementation principle and technical effect are similar to those of the above method embodiments, and are not described herein again.

In an embodiment, a computer program product is provided, which comprises a computer program, which when executed by a processor, implements the steps of the method for scheduling a mobile energy storage system provided by the above-mentioned embodiments. The implementation principle and technical effect are similar to those of the above method embodiments, and are not described herein again.

It should be noted that, the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, presented data, etc.) referred to in the present application are information and data authorized by the user or sufficiently authorized by each party.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high-density embedded nonvolatile Memory, resistive Random Access Memory (ReRAM), Magnetic Random Access Memory (MRAM), Ferroelectric Random Access Memory (FRAM), Phase Change Memory (PCM), graphene Memory, and the like. Volatile Memory can include Random Access Memory (RAM), external cache Memory, and the like. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others. The databases referred to in various embodiments provided herein may include at least one of relational and non-relational databases. The non-relational database may include, but is not limited to, a block chain based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, quantum computing based data processing logic devices, etc., without limitation.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A BIM model display method, characterized in that the method comprises:

2. The method of claim 1, wherein displaying the BIM model to be accessed based on the OpenGL ES technology and the BIM model file comprises:

analyzing the BIM model file based on the OpenGL ES technology to obtain information of a vertex of the BIM model to be accessed;

3. The method according to claim 1, wherein the receiving the BIM model file corresponding to the file identifier sent by the agent includes:

receiving a BIM model file which is sent by the agent end and corresponds to the model identification and is subjected to light weight processing;

the BIM model file after the weight reduction processing is the model file stored by the agent end or the model file received by the agent end and sent by the server.

4. A BIM model display method, characterized in that the method comprises:

5. The method of claim 4, further comprising:

if the agent end does not store the BIM model file corresponding to the model identification, the agent end sends the model access request to a server;

receiving a BIM model file corresponding to the model identification sent by the server;

and sending the BIM model file to the terminal.

6. The method according to claim 5, wherein the receiving the BIM model file corresponding to the model identifier sent by the server comprises:

and receiving the BIM model file which is sent by the server and is subjected to the light weight processing and corresponds to the model identification, wherein the BIM model file subjected to the light weight processing is geometric data obtained after the server performs digital-analog separation on the BIM model file corresponding to the model identification, and the BIM model file subjected to the light weight processing is obtained.

7. A BIM model display apparatus, the apparatus comprising:

the model access module is used for sending a model access request to the agent terminal, wherein the model access request comprises a model identifier of a BIM to be accessed;

8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 6.

9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that the computer program realizes the steps of the method of any one of claims 1 to 6 when executed by a processor.