CN113989442B - Building information model construction method and related device - Google Patents
Building information model construction method and related device Download PDFInfo
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- CN113989442B CN113989442B CN202111431732.2A CN202111431732A CN113989442B CN 113989442 B CN113989442 B CN 113989442B CN 202111431732 A CN202111431732 A CN 202111431732A CN 113989442 B CN113989442 B CN 113989442B
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Abstract
The application provides a building information model construction method and a related device, firstly, preprocessing a basic building information model to obtain a first building information model; then, obtaining model metadata corresponding to the basic building information model, wherein the model metadata represents state information of building components; finally, the first building information model and the model metadata are imported into a ghost 4 engine to generate a second building information model representing a three-dimensional building model including state information that interacts with a user device. The metadata of the BIM model can be extracted while the BIM model is rendered, and finally the three-dimensional model and the metadata obtained after rendering are reassembled to obtain the finally displayed building model, so that the modeling efficiency can be improved while the building model displaying effect is ensured.
Description
Technical Field
The application relates to the technical field of Building Information Models (BIMs), in particular to a building information model construction method and a related device.
Background
In the field of construction engineering, building Information Modeling (BIM) applications are embodied in a component production phase, a transportation phase, a site construction phase, and an operation and maintenance phase. When building the BIM model of the engineering project, generally, the existing BIM model needs to be imported into the relevant software for sorting and optimization, and then the illusion 4 engine UE4 is imported to achieve the optimal display effect and operation performance.
However, after sorting and optimization, the BIM model only has the rendered three-dimensional model, and metadata contained in the three-dimensional model will be lost, and the existing solution is to directly import the BIM model into the UE4 for visual display, but the visualization effect under the scheme is greatly reduced, which greatly affects user experience.
Disclosure of Invention
Based on the problems, the building information model construction method and the related device can extract the metadata of the BIM while rendering the BIM, and finally reassemble the three-dimensional model and the metadata obtained after rendering to obtain the finally displayed building model, so that the modeling efficiency can be improved while the building model display effect is ensured.
In a first aspect, an embodiment of the present application provides a building information model construction method, where the method includes:
preprocessing a basic building information model to obtain a first building information model;
obtaining model metadata corresponding to the basic building information model, wherein the model metadata represents state information of building components;
importing the first building information model and the model metadata into a ghost 4 engine to generate a second building information model representing a three-dimensional building model including state information interacting with a user device.
In a second aspect, an embodiment of the present application provides a building information model building apparatus, where the apparatus includes:
the model rendering unit is used for preprocessing the basic building information model to obtain a first building information model;
a metadata extraction unit for acquiring model metadata corresponding to the basic building information model, the model metadata representing state information of building elements;
a model building unit to import the first building information model and the model metadata into a ghost 4 engine to generate a second building information model representing a three-dimensional building model including state information interacting with a user device.
In a third aspect, an embodiment of the present application provides an electronic device, including a processor, a memory, a communication interface, and one or more programs, where the one or more programs are stored in the memory and configured to be executed by the processor, and the program includes instructions for executing the steps in the first aspect of the embodiment of the present application.
In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program enables a computer to perform some or all of the steps described in the first aspect of the embodiment of the present application.
In a fifth aspect, embodiments of the present application provide a computer program product, where the computer program product comprises a non-transitory computer-readable storage medium storing a computer program, where the computer program is operable to cause a computer to perform some or all of the steps as described in the first aspect of embodiments of the present application. The computer program product may be a software installation package.
Therefore, according to the building information model construction method and the related device provided by the application, firstly, a basic building information model is preprocessed to obtain a first building information model; then, model metadata corresponding to the basic building information model is obtained, wherein the model metadata represents state information of building components; finally, the first building information model and the model metadata are imported into a ghost 4 engine to generate a second building information model representing a three-dimensional building model including state information that interacts with a user device. The metadata of the BIM model can be extracted while the BIM model is rendered, and finally the three-dimensional model and the metadata obtained after rendering are reassembled to obtain the finally displayed building model, so that the modeling efficiency can be improved while the building model displaying effect is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is an application scenario diagram of a building information model construction method according to an embodiment of the present application;
fig. 2 is a schematic flow chart of a building information model construction method according to an embodiment of the present application;
fig. 3 is a schematic flow chart of another building information model construction method provided in the embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 5 is a block diagram illustrating functional units of a building information model building apparatus according to an embodiment of the present disclosure;
fig. 6 is a block diagram illustrating functional units of another building information model building apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In order to better understand the scheme of the embodiments of the present application, the following first introduces related terms and concepts to which the embodiments of the present application may relate.
The electronic device and the user equipment described in the embodiment of the present application may include a smart Phone (such as an Android Phone, an iOS Phone, a Windows Phone, etc.), a tablet computer, a palm computer, a notebook computer, a video matrix, a monitoring platform, a Mobile Internet device (MID, mobile Internet Devices), a wearable device, etc., which are merely examples, but are not exhaustive, and include but are not limited to the foregoing Devices, and of course, the electronic device may also be a server, for example, a cloud server.
An application scenario of a building information model construction method in the embodiment of the present application is described below with reference to fig. 1, where fig. 1 is an application scenario diagram of a building information model construction method provided in the embodiment of the present application, an application scenario 100 includes a development device 110, a cloud server platform 120, and a user device 130, where the development device 110 and the cloud server platform 120 are in communication connection, and the cloud server platform 120 and the user device 130 are in communication connection.
The development device 110 may be configured to establish a basic building information model, i.e., a BIM model, according to a target engineering drawing, where the target engineering drawing may be a set of CAD drawings, specifically, the CAD drawing set may be identified, each region is structured to gradually construct the basic building information model, and the basic building information model is established by a level of Detail (LOD) technique, so that accuracy of the basic building information model may be improved.
Further, the development device 110 may import the basic building information model into a preset 3D software, such as 3dsMax, maya, and so on, to perform a sorting optimization process, so as to obtain a first building information model, where the first building information model is a three-dimensional model and does not include metadata, and the development device 110 may carry a fantasy Engine 4 (UE 4) for extracting metadata of the basic building model, where the metadata includes geometric information, professional attributes, state information, and so on, and then import both the first building information model and the metadata into the UE4 to perform a processing, so as to obtain a high-definition building model, and add an interaction function to the high-definition building model through the UE4 Engine, so as to obtain a second building information model, where the interaction function may include movement, scaling, view switching, and so on of the second building information model, and is not particularly limited herein. The development device 110 may package the second building information model into an EXE-formatted executable file or directly upload the second building information model to the cloud service platform 120 in a pixel stream form for configuration of the cloud game service.
The cloud service platform 120 may include a cloud GPU server 121 and a cloud front-end server 122, and the cloud GPU server 121 and the cloud front-end server 122 are connected to each other.
In a possible embodiment, in a case that the development device 110 packages the second building information model into an EXE-formatted executable file and uploads the EXE-formatted executable file to the cloud service platform 120, the cloud GPU server 121 is configured to start the EXE-formatted executable file and send the executable file to the cloud front-end server 122 in a form of a video stream, the cloud front-end server 122 is configured to receive data in the form of the video stream and generate a front-end interaction page and an interaction portal link according to the video stream data, the front-end interaction page is configured to enable a target user to interact with the second building information model, and the interaction portal link is configured to jump to the target interaction page. The interactive portal link may be a Uniform Resource Locator (URL), a two-dimensional code, and the like, which is not limited herein.
In a possible embodiment, in a case that the development device 110 outputs the second building information model to the cloud service platform 120 in a pixel stream form, the pixel stream data may be received by a node service and deployed to the cloud server platform 120, the cloud GPU server 121 may process the pixel stream data in combination with the node service, send the pixel stream data to the cloud front-end server 122 in a video stream form, the cloud front-end server 122 is configured to receive the data in the video stream form, and generate a front-end interaction page and an interaction portal link according to the video stream data, the front-end interaction page is configured to enable a target user to interact with the second building information model, and the interaction portal link is configured to jump to the target interaction page. The interactive portal link may be a Uniform Resource Locator (URL), a two-dimensional code, or the like, which is not limited herein.
IT is understood that the cloud Service platform 120 may provide the cloud game Service of the second building information model by using an Infrastructure as a Service (IaaS), which is to provide the IT Infrastructure as a Service to the outside through a network. In the service model, a data center does not need to be built by itself, infrastructure services including servers, storage, networks and the like are used in a renting mode, cloud game services with various channels can be provided for a target user through a cloud service platform of an IaaS architecture, the target user can log in the cloud game service of the second building information model from a mobile terminal, a desktop computer terminal and a tablet computer terminal by using user equipment 130, and can also log in from a webpage, a small program and the like, and specific limitation is not made herein. And the portability of interaction between the target user and the second building information model is greatly improved.
The target user can log in a page of the cloud game service of the second building information model through the user equipment 130 and send input information to interact with the second building information model, and after receiving the input information of the user equipment 130, the cloud service platform 120 can generate streaming media data of the second building information model according to the input information and send the streaming media data to the user equipment 130 for displaying. For example, in a scenario that the second building information model is an underground garage, the entry information sent by the user equipment 130 is "move to the third left parking space", and the cloud service platform 120 may generate video data of "move to the third left parking space" according to the entry information, and synchronize the video data to the user equipment to complete interaction.
Therefore, the building information model provided by the embodiment of the application is built in the application scene, the BIM model can be rendered while the metadata of the BIM model is extracted, and finally the three-dimensional model and the metadata obtained after rendering are reassembled to obtain the finally displayed building model, so that the building model display effect can be ensured while the modeling efficiency is improved.
A building information model construction method in the embodiment of the present application is described below with reference to fig. 2, where fig. 2 is a schematic flow chart of the building information model construction method provided in the embodiment of the present application, and specifically includes the following steps:
The basic building information model represents a built BIM model, and the first building information model represents a preprocessed three-dimensional building model which does not contain metadata.
Specifically, the basic building information model may be imported into preset three-dimensional software, such as 3dsmax, maya, and the basic building information model may be rendered by the preset three-dimensional software to generate the first building information model.
Therefore, the preprocessed first building information model can be better imported into the UE4 for display.
The model metadata represents geometric information, professional attributes, state information, and the like of the building element, and the state data of the building, including the layout state of the whole building, the position, the range, and the number of each area, and the environmental factors of the area, such as the peripheral defects, may be generated by the model metadata, and is not particularly limited herein.
Specifically, the basic building information model may be imported into an illusion 4 engine, and then the basic building information model is read by a preset plug-in mounted on the UE4 to determine the model metadata, and the model metadata may be stored after being read by the UE4, without using the basic building information model.
Therefore, the model metadata can be extracted, preparation is made for subsequent modeling, and modeling efficiency is improved.
Wherein the second building information model represents a three-dimensional building model containing state data interacting with a user device.
Specifically, the UE4 may perform a third process on the model metadata to determine status data, where the third process may be to automatically restore the model metadata to obtain status data, where the status data may be related information corresponding to a model location, and then identify the status data to determine a corresponding location area of the status data in the first building information model, and finally associate the status data with the corresponding location area to generate the second building information model.
It can be seen that with the above method, first, preprocessing is performed on the basic building information model to determine a first building information model, which represents a preprocessed three-dimensional building model; then, obtaining model metadata corresponding to the basic building information model, wherein the model metadata represents state information of a building; finally, the first building information model and the model metadata are imported into a ghost 4 engine to generate a second building information model representing a three-dimensional building model containing state information interacting with a user device. The metadata of the BIM model can be extracted while the BIM model is rendered, and finally the three-dimensional model and the metadata obtained after rendering are reassembled to obtain the finally displayed building model, so that the modeling efficiency can be improved while the building model displaying effect is ensured.
Another building information model construction method in the embodiment of the present application is described below with reference to fig. 3, where fig. 3 is a schematic flow chart of another building information model construction method provided in the embodiment of the present application, and specifically includes the following steps:
in step 301, pre-processing is performed on the base building information model to determine a first building information model.
And step 304, uploading the second building information model to a cloud server.
The second building information model can be packaged into an engineering file in an EXE format and uploaded to a cloud server, and the second building information model can also be uploaded to the cloud server in a pixel stream mode without specific limitation.
Therefore, the lightweight second building information model enables a user to interact with the second building information model more easily, and user experience is improved.
The method comprises the steps that an interactive instruction of the user equipment for a parking space in the garage model can be obtained through a cloud server, the interactive instruction can comprise a viewing instruction and the like, and then state data of the second building information model are displayed to the user equipment according to the interactive instruction.
For example, under the condition that above-mentioned second building information model is underground garage model, when obtaining the user equipment to the instruction of looking over of the parking stall in the underground garage model, can show data such as parking stall serial number, parking stall position, parking stall scope and parking stall environmental parameter of this parking stall to user equipment, if the serial number that shows this parking stall is B290, the parking stall is located underground garage southeast corner, area 10.11 square meters, there is the heel post etc. parking stall next door, no longer gives details here.
Through the steps, the target user can interact with the BIM, the requirement of whether the net height meets the target vehicle type when the target parking space is used for parking different vehicle types is checked, interaction is directly carried out in a cloud game mode, display is carried out in an animation mode, and interaction experience of the target user is greatly improved.
It can be seen that, with the above method, first, preprocessing is performed on the basic building information model to determine a first building information model, which represents a preprocessed three-dimensional building model; then, obtaining model metadata corresponding to the basic building information model, wherein the model metadata represents state information of a building; finally, the first building information model and the model metadata are imported into a ghost 4 engine to generate a second building information model representing a three-dimensional building model including state information that interacts with a user device. The metadata of the BIM model can be extracted while the BIM model is rendered, and finally the three-dimensional model and the metadata obtained after rendering are reassembled to obtain the finally displayed building model, so that the modeling efficiency can be improved while the building model displaying effect is ensured.
The steps not described in detail above can be referred to the method described in whole or in part in fig. 2, and are not described again here.
Fig. 4 is a schematic structural diagram of an electronic device in the embodiment of the present application, and as shown in fig. 4, the electronic device 400 includes a processor 401, a communication interface 402, and a memory 403, where the processor, the communication interface, and the memory are connected to each other, where the electronic device 400 may further include a bus 404, and the processor 401, the communication interface 402, and the memory 403 may be connected to each other by the bus 404, and the bus 404 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, or the like. The bus 404 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 4, but this does not indicate only one bus or one type of bus. The memory 403 is used for storing a computer program comprising program instructions, and the processor is configured to call the program instructions to execute all or part of the method described in fig. 2/3 above.
The above description has introduced the solution of the embodiment of the present application mainly from the perspective of the method-side implementation process. It is understood that the electronic device comprises corresponding hardware structures and/or software modules for performing the respective functions in order to realize the functions. Those of skill in the art will readily appreciate that the present application is capable of hardware or a combination of hardware and computer software implementing the various illustrative elements and algorithm steps described in connection with the embodiments provided herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiment of the present application, the electronic device may be divided into the functional units according to the method example, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.
In the case of adopting each functional module divided for each function, a detailed description will be given below with reference to fig. 5 of a building information model construction apparatus in an embodiment of the present application, where the building information model construction apparatus 500 includes:
a model rendering unit 510, configured to preprocess the basic building information model to obtain a first building information model;
a metadata extraction unit 520, configured to obtain model metadata corresponding to the basic building information model, where the model metadata represents state information of building elements;
a model construction unit 530 for importing the first building information model and the model metadata into an illusion 4 engine to generate a second building information model representing a three-dimensional building model including state information interacting with a user device.
In the case of using an integrated unit, the following describes in detail another building information model building apparatus 600 in the embodiment of the present application with reference to fig. 6, where the building information model building apparatus 600 includes a processing unit 601 and a communication unit 602, where the processing unit 601 is configured to execute any step in the method embodiments as described above, and when data transmission such as sending is performed, the communication unit 602 is optionally invoked to complete the corresponding operation.
The building information model construction apparatus 600 may further include a storage unit 603 for storing program codes and data. The processing unit 601 may be a processor, the communication unit 602 may be a touch display screen, and the storage unit 603 may be a memory.
The processing unit 601 is specifically configured to:
preprocessing a basic building information model to obtain a first building information model;
obtaining model metadata corresponding to the basic building information model, wherein the model metadata represents state information of building components;
importing the first building information model and the model metadata into a ghost 4 engine to generate a second building information model representing a three-dimensional building model including state information interacting with a user device.
It can be understood that, since the method embodiment and the apparatus embodiment are different presentation forms of the same technical concept, the content of the method embodiment portion in the present application should be synchronously adapted to the apparatus embodiment portion, and is not described herein again. Both the building information model construction apparatus 500 and the building information model construction apparatus 600 described above can perform all of the building information model interaction methods included in the above embodiments.
Embodiments of the present application also provide a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, the computer program enabling a computer to perform part or all of the steps of any one of the methods as described in the above method embodiments, and the computer includes a fish school detection device.
Embodiments of the present application also provide a computer program product comprising a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of any of the methods as described in the above method embodiments. The computer program product may be a software installation package, the computer comprising an electronic device.
It should be noted that for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the above-described units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or units, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit may be stored in a computer readable memory if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, the technical solutions of the present application, which are essential or part of the technical solutions contributing to the prior art, or all or part of the technical solutions, may be embodied in the form of a software product, which is stored in a memory and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the above methods of the embodiments of the present application. And the aforementioned memory comprises: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and various media capable of storing program codes.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash Memory disks, read-Only memories (ROMs), random Access Memories (RAMs), magnetic or optical disks, and the like.
The foregoing embodiments have been described in detail, and specific examples are used herein to explain the principles and implementations of the present application, where the above description of the embodiments is only intended to help understand the method and its core ideas of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (6)
1. A building information model construction method, characterized in that the method comprises:
importing a basic building information model into preset three-dimensional software, and rendering the basic building information model through the preset three-dimensional software to generate a first building information model, wherein the basic building information model represents a built BIM (building information modeling), and the first building information model represents a preprocessed three-dimensional building model which does not contain metadata;
importing the basic building information model into a phantom 4 engine, reading the basic building information model through a preset plug-in carried on the phantom 4 engine to obtain model metadata corresponding to the basic building information model, wherein the model metadata represent geometric information, professional attributes and state information of building components;
automatically restoring the model metadata through the illusion 4 engine to obtain state data, wherein the state data comprises information corresponding to a model position;
identifying, by the illusion 4 engine, the status data to determine a corresponding location area of the status data in the first building information model;
correlating, by the illusion 4 engine, the state data to the corresponding location area to generate a second building information model, the second building information model representing a three-dimensional building model containing state information interacting with a user device.
2. The method of claim 1, wherein after importing the first building information model and the model metadata into a phantom 4 engine to generate a second building information model, the method further comprises:
uploading the second building information model to a cloud server;
and displaying the second building information model to user equipment in a cloud game mode through the cloud server.
3. The method of claim 2, wherein the second building information model comprises an underground garage model; the displaying the second building information model to a user device in a cloud game manner through the cloud server includes:
acquiring an interactive instruction of the user equipment for a parking space in the underground garage model;
and displaying the state data of the parking space to the user equipment according to the interactive instruction, wherein the state data comprises a parking space number, a parking space position, a parking space range and parking space environment parameters.
4. An apparatus for building information model construction, the apparatus comprising a processing unit configured to:
importing a basic building information model into preset three-dimensional software, and rendering the basic building information model through the preset three-dimensional software to generate a first building information model, wherein the basic building information model represents a built BIM model, and the first building information model represents a preprocessed three-dimensional building model which does not contain metadata;
importing the basic building information model into an illusion 4 engine, reading the basic building information model through a preset plug-in carried on the illusion 4 engine to obtain model metadata corresponding to the basic building information model, wherein the model metadata represent geometric information, professional attributes and state information of building components;
automatically restoring the model metadata through the illusion 4 engine to obtain state data, wherein the state data comprises information corresponding to a model position;
identifying the status data to determine a corresponding location area of the status data in the first building information model;
associating the status data to the corresponding location area to generate a second building information model representing a three-dimensional building model containing status information interacting with a user device.
5. An electronic device comprising a processor, memory, and one or more programs stored in the memory and configured to be executed by the processor, the programs including instructions for performing the steps in the method of any of claims 1-3.
6. A computer storage medium, characterized in that the computer storage medium stores a computer program comprising program instructions which, when executed by a processor, cause the processor to carry out the method according to any one of claims 1 to 3.
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