Digital prototype room construction system based on BIM and VR

Abstract

The invention relates to the technical field of building construction, and discloses a BIM and VR-based digital prototype room construction system, which comprises a BIM model export module, a VR visualization module, an interactive processing module, a data synchronization module, a user interface module and a positioning and tracking module, the BIM model exporting module is used for exporting a BIM model from design software and converting the BIM model into a format which can be used by VR; the VR visualization module is used for visually presenting the BIM model in a VR environment, the BIM model of the prototype room is created, the model is synchronized to a VR virtual world, a user can enter the prototype room in the virtual world through VR equipment, the user can conduct construction on the prototype room, efficiency is improved, and construction material resources are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and more specifically to a digital model room construction system based on BIM and VR. Background Art

[0002] Virtual reality technology, referred to as VR technology, is a brand-new science and technology developed in the 20th century. Its technical characteristics are the combination of three-dimensional digital models generated by computer image technology and virtual reality technology to produce an artificial virtual environment. Through application software systems, input devices and demonstration devices, people can fully interact with the virtual world. Since its inception, BIM technology has been widely recognized and applied in the current construction industry. BIM technology can integrate model and data information content, and can provide rich content and real scenes for the implementation of virtual reality.

[0003] Currently, when constructing a model room in a building, it is necessary to conduct an on-site inspection and then carry out construction to complete the construction of the physical model room.

[0004] However, building a physical model room is time-consuming and labor-intensive, and consumes a lot of materials, with few reusable materials, resulting in a waste of resources. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a digital model room construction system based on BIM and VR to solve the problems existing in the above-mentioned background technology.

[0006] The present invention provides the following technical solution: a digital model room construction system based on BIM and VR, comprising: a BIM model export module, a VR visualization module, an interactive processing module, a data synchronization module, a user interface module and a positioning and tracking module;

[0007] The BIM model export module is used to export the BIM model from the design software and convert it into a format that can be used by VR;

[0008] The VR visualization module is used to visualize the BIM model in a VR environment;

[0009] The interaction processing module is responsible for processing the interaction between the user and VR;

[0010] The data synchronization module is used to synchronize the adjustment of the BIM model to the VR model in real time;

[0011] The user interface module is used to provide an interface for users to interact with VR;

[0012] The positioning and tracking module tracks the movement of the user in the real space.

[0013] Furthermore, the BIM model export module has the following steps when exporting the BIM model: the BIM model is exported to a specific format, such as FBX, DAE or OBJ format, through the Revit software, so that the BIM model can be used in a VR environment, and at the same time, the SteamVR plug-in is used to simplify the BIM model import process.

[0014] Furthermore, the VR visualization module is used for processing the BIM source model, as well as model transmission and generation of a VR experience system. The generation of the VR experience system is used to edit the effects of the loaded BIM model and render it to generate a VR system that can be experienced.

[0015] Furthermore, the interaction processing module is used to process operations performed by the user on the BIM model in the current VR environment, such as changing the BIM material, attribute or size, including viewing the BIM model from different perspectives.

[0016] Furthermore, the data synchronization module adopts a timestamp-based incremental synchronization algorithm to synchronize changes and adjustments between the BIM model and the VR model.

[0017] Furthermore, the user interface module is used to set an operable VR interface for the user, so as to facilitate the user to operate the model room in VR.

[0018] Furthermore, the positioning and tracking module is used to track the position of the user in the constructed real environment and synchronize the position to the VR virtual world to realize the function of walking in the model room model. The positioning and tracking module is used to locate the user in the following steps:

[0019] S101: define a reference coordinate system in the set real play range, and create a corresponding coordinate system in the VR virtual environment. Assuming that the size of the coordinate system in the real play range is S, the size of the coordinate system in the virtual environment is nS, where nS represents n times the specific size of the real play range, and the size of nS is the actual size of the created BIM model room model;

[0020] S102: Two optical trackers are installed diagonally within the actual play range to detect the position of the user wearing the VR device;

[0021] S103: When the user moves within the real play range, the marker of the VR device stretched by the user is captured by the optical tracker, and the data sent by the optical tracker is used to calculate the real-time position of the user in the physical space;

[0022] S104: converting the physical position data obtained from the optical tracker into virtual position data in the VR environment, during which a scale parameter needs to be adjusted, and the scale parameter is n, so that the position of the user in the real play range can be mapped in the model room model in the virtual space;

[0023] S105: The VR system needs to receive the user's position data in real time and update the user's position in the virtual environment to achieve synchronization.

[0024] Furthermore, the system includes a VR device, which includes a computer, a head-mounted display, a control handle, an optical tracker and a device stand.

[0025] Furthermore, the system provides a digital model room construction method based on BIM and VR, including the following steps:

[0026] S1: Determine the information of the constructed BIM model, including the layout, size and spatial relationship of the rooms, as well as the construction materials of the model room, including the floor and walls, and the quality standards of its construction;

[0027] S2: Use Revit software to build a BIM model of the model room, and the technicians will review whether the BIM model conforms to the model room information;

[0028] S3: Import the established BIM model into the Naviswork software and run the collision detection program. If a collision point is found, the detailed design drawings and models need to be readjusted;

[0029] S4: Export the BIM model of the model room through Revit software, and export the constructed BIM model and model attribute data into a specific format, such as FBX, DAE or OBJ format, so as to be used in the VR environment. This step is performed by the BIM model export module;

[0030] S5: Use the third-party plug-in SteamVR to simplify the process of importing BIM models into VR;

[0031] The main functions of third-party plug-ins such as SteamVR are:

[0032] The SteamVR plugin can help seamlessly import BIM models from the design software Revit into VR;

[0033] S6: Use assembly plates to build a physical space scene in reality, and set up an optical tracking locator inside it. Users can perform construction on the model room BIM model in the scene.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. This application creates a BIM model of the model room and synchronizes the model to the VR virtual world. Users can enter the model room in the virtual world through VR devices and carry out construction on the model room, which improves efficiency and saves construction material resources.

[0036] 2. This application sets up a data synchronization module, which adopts a timestamp-based incremental synchronization algorithm to synchronize adjustments between BIM models and templates in the VR virtual world. This can convert the model's construction appearance and model data more quickly and with greater flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a flow chart of the interaction between the BIM model and VR of the present invention.

[0038] Figure 2 It is a flow chart of the interaction between the BIM model and VR of the present invention.

[0039] Figure 3 Schematic diagram of the arrangement of optical trackers in the VR scene of the present invention.

[0040] Figure 4 This is a schematic diagram of positioning a VR device according to the present invention.

[0041] Figure 5 It is a schematic diagram of calibrating the ground height in the present invention.

[0042] Figure 6 A schematic diagram of a virtual sample room boundary is drawn for the present invention.

[0043] Figure 7 Schematic diagram of calibrating the boundary between samples according to the present invention.

[0044] Figure 8 This is a schematic diagram of the bathroom in the BIM collaboration mode interface of the Enscape browser in the present invention.

[0045] Fig. 9 This is a schematic diagram of the virtual reality bathroom after adjustment according to the present invention. Fig.10 It is a schematic diagram of the moving positions of the plane coordinate system of the actual play area and the reference coordinate system of the virtual model room model in the present invention. DETAILED DESCRIPTION

[0046] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative. The digital model room construction system based on BIM and VR involved in the present invention is not limited to the various structures recorded in the following embodiments. All other implementations obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0047] See also Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a digital model room construction system based on BIM and VR, including: a BIM model export module, a VR visualization module, an interactive processing module, a data synchronization module, a user interface module and a positioning and tracking module;

[0048] The BIM model export module is used to export the BIM model from the design software and convert it into a format that can be used by VR;

[0049] The VR visualization module is used to visualize the BIM model in a VR environment;

[0050] The interaction processing module is responsible for processing the interaction between the user and VR;

[0051] The data synchronization module is used to synchronize the adjustment of the BIM model to the VR model in real time;

[0052] The user interface module is used to provide an interface for users to interact with VR;

[0053] The positioning and tracking module tracks the movement of the user in the real space.

[0054] The BIM model of the model room is constructed based on the information obtained, and then imported into the VR system through the BIM model export module. The model can be presented in the virtual world through the VR visualization module. At this time, the user can visit the model room in the virtual world by wearing the VR device, and the various operations performed by the user are performed by the interaction processing module. If changes occur in the BIM model, the data synchronization module can synchronize the changes, and the changes in the virtual world will also be synchronized to the BIM model. The positioning tracking module can track the user's position in the real world and synchronize it to the virtual world, so that the user can visit the model room in the virtual world, which can save building material resources. The use of BIM plus VR can make people intuitively and truly feel the virtual environment of the model room and realize the interaction between people and the model room.

[0055] See also Figure 1 and Figure 2As shown, the BIM model export module has the following steps when exporting the BIM model: the BIM model is exported to a specific format, such as FBX, DAE or OBJ format, through the Revit software, so that the BIM model can be used in the VR environment, and the SteamVR plug-in is used to simplify the BIM model import process. The VR visualization module is used for processing the BIM source model, as well as model transmission and the generation of the VR experience system. The generation of the VR experience system is used to edit the effects and render the loaded BIM model to generate a VR system for experience. The interaction processing module is used to process the user's operations on the BIM model in the current VR environment, such as changing the BIM material, attribute or size, including viewing the BIM model from different perspectives. The data synchronization module adopts a timestamp-based incremental synchronization algorithm to synchronize the changes and adjustments of the BIM model and the VR model through the timestamp-based incremental synchronization algorithm. The user interface module is used to set an operable VR interface for the user, which is conducive to the user to operate the model room model in VR.

[0056] Get the information of the model room, which includes the layout, size and spatial relationship of the room, as well as the construction materials of the model room, including the floor and walls, and the quality standards of its construction. Create the BIM model of the model room through Revit software. Create the model center file and work set based on the Revit platform by profession, establish the central file axis network, and simultaneously set up the structure, architecture, fire protection, HVAC, electromechanical, decoration and other building information models. After the construction is completed, the technical staff will review whether the BIM model conforms to the model room information. Then it can be exported to a specific format, such as FBX, through Revit software, so that the BIM model can be used in the VR environment, and then used for the processing of the BIM source model through the VR visualization module. The BIM source model is the BIM model of the model room. Ensure that the materials in the BIM model correspond to the real material names one by one, and optimize the number of model faces to improve the running speed and efficiency of the VR processing platform. Then select the appropriate intermediate format (such as FBX) to pass the BIM model to the subsequent processing software, using a 3D game development platform or a real-time effect display platform, such as Unity3D or Unreal. Engine, which loads the intermediate format file for effect editing, rendering and baking, and generates a VR system for experience, so that users can operate or play in the virtual space;

[0057] The timestamp-based incremental synchronization algorithm has the following steps when synchronizing the BIM model and the VR model:

[0058] Determine the timestamp field: When the BIM model is updated, add a timestamp to each updated data;

[0059] Record the last synchronization time: set a variable to store the timestamp data of the last update;

[0060] Query change data: In the next synchronization of BIM model and VR model, query all records that meet the timestamp and the last interaction synchronization time of BIM model and VR model. The query condition is that the timestamp is greater than the last interaction synchronization time of BIM model and VR model.

[0061] Execute synchronization operation: synchronize all the changed data that meet the conditions found in the query to the VR model;

[0062] Update timestamp: Update the last interaction synchronization time between the BIM model and the VR model to the timestamp data of this synchronization operation;

[0063] Assume the timestamp is H, H n is the latest timestamp, H ed is the last interaction synchronization time between the BIM model and the VR model, H m is the one with the largest timestamp among all records, then the expression is as follows:

[0064] H n =H m where H>H ed

[0065] It should be noted that the timestamp field should be initialized when recording, and the timestamp field data should be updated synchronously each time the record is updated, and the value of the timestamp field should be globally unique.

[0066] In this way, all operations and adjustments made in the BIM model can be reflected in the VR model in real time, improving the efficiency of model construction and saving resources. The model's construction appearance and model data can be converted more quickly and flexibly.

[0067] See also Figure 2 , Figure 3 , Figure 5 and Fig. 9 As shown, the positioning and tracking module is used to track the position of the user in the constructed real environment and synchronize the position to the VR virtual world to realize the function of walking in the model room model. The positioning and tracking module is used to locate the user in the following steps:

[0068] S101: define a reference coordinate system in the set real play range, and create a corresponding coordinate system in the VR virtual environment. Assuming that the size of the coordinate system in the real play range is S, the size of the coordinate system in the virtual environment is nS, where nS represents n times the specific size of the real play range, and the size of nS is the actual size of the created BIM model room model;

[0069] S102: Two optical trackers are installed diagonally within the actual play range to detect the position of the user wearing the VR device;

[0070] S103: When the user moves within the real play range, the marker of the VR device stretched by the user is captured by the optical tracker, and the data sent by the optical tracker is used to calculate the real-time position of the user in the physical space;

[0071] S104: converting the physical position data obtained from the optical tracker into virtual position data in the VR environment, during which a scale parameter needs to be adjusted, and the scale parameter is n, so that the position of the user in the real play range can be mapped in the model room model in the virtual space;

[0072] S105: The VR system needs to receive the user's position data in real time and update the user's position in the virtual environment to achieve synchronization.

[0073] According to the above steps, assume that the real play range is set to S, and the coordinate system size in the virtual environment is n times S. Taking the plane coordinate system as an example, the specific position of the user in the model room model in the virtual environment corresponding to the real play range can be calculated by the following expression:

[0074] xV=n*xP

[0075] yV=n*yP

[0076] The above expression is used to calculate the actual position of the user in the virtual environment corresponding to the real play range, and the position mapping relationship is as follows: Fig. 9 As shown, the inner coordinates of the real play range set by the user in the real world are (xP, yP), and the corresponding coordinate position in the virtual world is (xV, yV);

[0077] If the user leaves the real play range, that is, xV>xMax, yV>yMax, the maximum coordinate is greater than the coordinate coefficient value of the model in the model room in the virtual environment, and xMax is the maximum horizontal coordinate value, yMax is the maximum vertical coordinate value, the VR system regards the current environment as an unknown environment, and the head-mounted display will alarm to prompt the user.

[0078] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the system includes a VR device, which includes a computer, a head-mounted display, a control handle, an optical tracker and a device stand.

[0079] It should be noted that the computer and headband display are equipped with one, the control handle, optical tracker and device bracket are equipped with two, and the device bracket is used to install the optical tracker, which is installed at the diagonal position within the actual play range. The installation method is as follows: Figure 2 and Figure 3 As shown, the distance between trackers does not exceed 5 meters, and the height is arranged above 2 meters. The field of view of each locator is 120 degrees, and it is installed at a downward tilt of 30 to 45 degrees to fully cover the entire scene area. The scene area is the actual play range, which is used to comprehensively detect the user's mobile position.

[0080] The system provides a digital model room construction method based on BIM and VR, including the following steps:

[0081] S1: Determine the information of the constructed BIM model, including the layout, size and spatial relationship of the rooms, as well as the construction materials of the model room, including the floor and walls, and the quality standards of its construction;

[0082] S2: Use Revit software to build a BIM model of the model room, and the technicians will review whether the BIM model conforms to the model room information;

[0083] S3: Import the established BIM model into the Naviswork software and run the collision detection program. If a collision point is found, the detailed design drawings and models need to be readjusted;

[0084] S4: Export the BIM model of the model room through Revit software, and export the constructed BIM model and model attribute data into a specific format, such as FBX, DAE or OBJ format, so as to be used in the VR environment. This step is performed by the BIM model export module;

[0085] S5: Use the third-party plug-in SteamVR to simplify the process of importing BIM models into VR;

[0086] The main functions of third-party plug-ins such as SteamVR are:

[0087] The SteamVR plugin can help seamlessly import BIM models from the design software Revit into VR;

[0088] S6: Use assembly plates to build a physical space scene in reality, and set up an optical tracking locator inside it. Users can perform construction on the model room BIM model in the scene.

[0089] Among them, according to the on-site needs, determine the sample production area, clarify the display content of each part of the sample area, the depth of the sample room model, collect the process methods of each part, the material mapping of each part, and the virtual reality interactive design. Use Revit software to build a BIM model according to the required requirements and size information. The BIM model contains the sample room size, wall structure and material. It is also necessary to establish family models such as sanitary ware and lamps, and assign corresponding materials. Load them into the Revit project file through the family editor, and complete the model layout in the corresponding position according to the detailed drawings. The family model is constructed according to the size provided by the manufacturer, and then the technicians review the constructed sample room BIM model. After the review is completed, collision detection can be performed through Naviswork software. Through collision detection, spatial conflicts between buildings and structures, structures and equipment, and various disciplines within equipment can be discovered in advance;

[0090] During the implementation of this embodiment, after the VR device is connected as required, the SteamVR program is run until the head-mounted display, controller, and optical tracker are in green status in the SteamVR status bar, stand in the center of the optical tracking locator, locate the controller and the head-mounted display, and when the head-mounted display and controller are in a trackable state, aim the controller at the computer monitor, use the index finger to press the trigger to specify the default display direction, and then place the controller on the ground and click Calibrate Ground to locate the ground height of the virtual room;

[0091] After the ground calibration is successful, run the room setting to start drawing the virtual room range. After confirming that the head-mounted display and the controller are in a trackable state, pull the trigger and move around the room to draw the available action space around it. The virtual room boundary setting is completed after the virtual room is closed and a green area of ​​no less than 2 square meters appears.

[0092] Take the bathroom model in the model room as an example. Enter the Enscape browser and set it to walking mode. After starting the virtual reality state while ensuring that the VR device can be tracked, enter the virtual reality model bathroom. You can move to every corner of the bathroom by wearing a helmet display, or jump scenes by using a handle. Start the BIM collaboration mode in the Enscape browser, and the BIM model attribute information will pop up in the left window frame. Select the yellow mosaic wall, find the material and decorative bar, and replace the yellow mosaic map with a green mosaic map. The mosaic wall of the virtual bathroom model room will change synchronously. This method can be used to compare the overall effect of the decoration scheme under different materials. Other rooms in the model room can be changed in this way, so that users can intuitively view the model room and the decoration effect of the model room.

[0093] Any of the steps described above may be stored as computer instructions or programs in an unlimited computer memory, and may be called and recognized by an unlimited computer processor to implement any step in the embodiments of the present application, without any unnecessary restrictions.

[0094] The above is only a specific implementation of the present invention, and any other improvements made based on the concept of the present invention are considered to be within the protection scope of the present invention.

Claims

1. A digital model room construction system based on BIM and VR, characterized in that: include: BIM model export module, VR visualization module, interaction processing module, data synchronization module, user interface module and positioning and tracking module; The BIM model export module is used to export the BIM model from the design software and convert it into a format that can be used by VR; The VR visualization module is used to visualize the BIM model in a VR environment; The interaction processing module is responsible for processing the interaction between the user and VR; The data synchronization module is used to synchronize the adjustment of the BIM model to the VR model in real time; The user interface module is used to provide an interface for users to interact with VR; The positioning and tracking module tracks the movement of the user in the real space.

2. According to the digital model room construction system based on BIM and VR according to claim 1, it is characterized by: The BIM model export module has the following steps when exporting the BIM model: the BIM model is exported to a specific format, such as FBX, DAE or OBJ format, through the Revit software, so that the BIM model can be used in a VR environment, and at the same time, the SteamVR plug-in is used to simplify the BIM model import process.

3. According to the digital model room construction system based on BIM and VR according to claim 1, it is characterized by: The VR visualization module is used for processing the BIM source model, as well as model transmission and generation of a VR experience system. The generation of the VR experience system is used to perform effect editing and rendering on the loaded BIM model to generate a VR system that can be experienced.

4. According to the digital model room construction system based on BIM and VR according to claim 1, it is characterized by: The interaction processing module is used to process the operations performed by the user on the BIM model in the current VR environment, such as changing the BIM material, attribute or size, including viewing the BIM model from different perspectives.

5. According to the digital model room construction system based on BIM and VR according to claim 1, it is characterized by: The data synchronization module adopts a timestamp-based incremental synchronization algorithm to synchronize changes and adjustments between the BIM model and the VR model.

6. The digital model room construction system based on BIM and VR according to claim 1 is characterized by: The user interface module is used to set an operable VR interface for the user, which is convenient for the user to operate the model room in VR.

7. The digital model room construction system based on BIM and VR according to claim 1 is characterized by: The positioning and tracking module is used to track the position of the user in the constructed real environment and synchronize the position to the VR virtual world to realize the function of walking in the model room model. The positioning and tracking module is used to locate the user in the following steps: S101: define a reference coordinate system in the set real play range, and create a corresponding coordinate system in the VR virtual environment. Assuming that the size of the coordinate system in the real play range is S, the size of the coordinate system in the virtual environment is nS, where nS represents n times the specific size of the real play range, and the size of nS is the actual size of the created BIM model room model; S102: Two optical trackers are installed diagonally within the actual play range to detect the position of the user wearing the VR device; S103: When the user moves within the real play range, the marker of the VR device stretched by the user is captured by the optical tracker, and the data sent by the optical tracker is used to calculate the real-time position of the user in the physical space; S104: converting the physical position data obtained from the optical tracker into virtual position data in the VR environment, during which a scale parameter needs to be adjusted, and the scale parameter is n, so that the position of the user in the real play range can be mapped in the model room model in the virtual space; S105: The VR system needs to receive the user's position data in real time and update the user's position in the virtual environment to achieve synchronization.

8. The digital model room construction system based on BIM and VR according to claim 1 is characterized by: The system includes a VR device, which includes a computer, a head-mounted display, a control handle, an optical tracker and a device stand.

9. The digital model room construction system based on BIM and VR according to claim 1 is characterized by: The system provides a digital model room construction method based on BIM and VR, including the following steps: S1: Determine the information of the constructed BIM model, including the layout, size and spatial relationship of the rooms, as well as the construction materials of the model room, including the floor and walls, and the quality standards of its construction; S2: Use Revit software to build a BIM model of the model room, and the technicians will review whether the BIM model is consistent with the model room information; S3: Import the established BIM model into the Naviswork software and run the collision detection program. If a collision point is found, the detailed design drawings and models need to be readjusted; S4: Export the BIM model of the model room through Revit software, and export the constructed BIM model and model attribute data into a specific format, such as FBX, DAE or OBJ format, so as to be used in the VR environment. This step is performed by the BIM model export module; S5: Use the third-party plug-in SteamVR to simplify the process of importing BIM models into VR; The main functions of third-party plug-ins such as SteamVR are: The SteamVR plugin can help seamlessly import BIM models from the design software Revit into VR; S6: Use assembly plates to build a physical space scene in reality, and set up an optical tracking locator inside it. Users can perform construction on the model room BIM model in the scene.

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