CN116108516A - Method for creating and integrating partitioned building information model of point cloud - Google Patents
Method for creating and integrating partitioned building information model of point cloud Download PDFInfo
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Abstract
The invention discloses a method for creating and integrating a partitioned building information model of a point cloud, which is used for conveniently reconstructing a three-dimensional model through three-dimensional point cloud information of an existing building and a scene. The method solves the problems of low reverse modeling efficiency and poor operation convenience in arrangement caused by overlarge point cloud information, and ensures the integrity of the project building information model and the consistency of three-dimensional point cloud data and building information model data.
Description
Technical Field
The invention belongs to the technical field of building engineering information, and relates to a method for creating and integrating a blocking model of an existing building point cloud.
Background
For irregular buildings or existing buildings, reverse building information models can be created through three-dimensional point location data of live-action, but for park building groups, the method has the characteristics of large scale, large number of nonlinear morphological complex elements such as landscape, and the like, and the problem that reverse modeling by using the whole three-dimensional scanning data is inconvenient due to overlarge whole three-dimensional scanning data is frequently caused.
Disclosure of Invention
In order to solve the problem that the traditional technology is inconvenient to use the integral three-dimensional scanning data reverse modeling due to the fact that the point cloud information is too huge, the invention provides a method for creating and integrating the partitioned building information model of the point cloud.
The invention adopts the following technical scheme:
a method for creating and integrating a partitioned building information model of a point cloud is characterized by comprising the following steps:
(1) Acquiring three-dimensional point cloud data of a live-action, wherein file formats are las, laz, ptx and txt, and the point cloud scanning precision is required to be not lower than 5mm;
(2) Analyzing the functional characteristics and the correlation of each area of a building according to the point cloud range, determining the partitioning standard of the building, dividing the whole point cloud information into outdoor point clouds and indoor point clouds according to indoor and outdoor partitioning and each building partitioning in sequence, and dividing the indoor point clouds into single building point clouds according to the building if a plurality of buildings exist; if the monolithic modeling area of the building is greater than 5000m 2 Partitioning again according to floors of a single building, wherein coordinates of point cloud data are not changed after partitioning;
(3) Importing the three-dimensional point cloud data into Cloudcompare software, partitioning according to the standard of the step (2), and exporting partitioned three-dimensional point cloud data after partitioning;
(4) Importing the partitioned three-dimensional point cloud data into Autodesk RECap software for format conversion, and exporting RCP/RCS format three-dimensional point cloud data which can be identified by Revit software;
(5) Creating project overall engineering in Revit software, defining the project overall engineering as rvt0, and ensuring that the coordinate system of each block building information model is consistent with the point cloud coordinate system;
(6) Respectively creating a block Revit engineering project, wherein the project is defined as rvt1 and 2 … … N, and N is a natural number larger than 2;
(7) Respectively linking the partitioned RCP/RCS format three-dimensional point cloud data of the step (4) in rvt and 2 … … N projects, forming a three-dimensional point cloud image in Revit software, and creating each partitioned building information model according to the point cloud outline;
(8) Opening project overall project rvt0, sequentially linking the partitioned revit models rvt, 2 … … N respectively, and releasing project coordinates of the current project overall project rvt0 to respectively enable the linked partitioned revit models to obtain project overall project coordinates of rvt 0;
(9) In the project overall project rvt0, all the block revit models rvt, 2 … … N are linked by shared coordinates, and integration of all the block building information models is performed to form an overall building information model;
(10) And (3) a nwc-format light-weight integral building information model is derived from the integral engineering rvt0 model, a nwc-format integral building information light-weight model and the initial three-dimensional point cloud data in the step (1) are imported in Navisworks software, consistency check is carried out, if the deviation value is within a certain allowable range, the integral building information model creation work is completed, otherwise, the step (1) is returned to check the accuracy of the point cloud or the step (7) is returned to modify each block building information model.
In the step (2), referring to the point cloud range, analyzing the functional characteristics and the correlation of each area of the building, and determining the partitioning standard of the building, wherein the specific steps are as follows: will be mainly used for landscape and underground facilitiesThe indoor and outdoor parts in planar layout are separated from the indoor parts in vertical layout mainly including building space, the buildings with independent building functions are independent, the building model creation process is advanced by the floor division, and when the single modeling area of the building is more than 5000m 2 In the process, the modeling operation is inconvenient because of excessive elements of the point cloud data, and limitation is made, the blocks are partitioned again according to the floors of a single building, and the coordinates of the point cloud data are not changed after the blocks are partitioned.
The specific steps of the step (3) are as follows: and (3) importing the three-dimensional point cloud data into Cloudcompare software, drawing a point cloud dividing line according to the determined area range, and carrying out three-dimensional point cloud data blocking by applying a segment in command and a segment out command of the Cloudcompare software according to the rule determined in the step (2), and after the blocking is completed, exporting blocked three-dimensional point cloud data.
The specific steps of the step (4) are as follows: the method comprises the steps of importing partitioned three-dimensional point cloud data by using an Autodesk RECap software by using an 'import files' command and an 'index scan' command, loading a partitioned three-dimensional point cloud data image by using a 'launch project' command, and finally exporting RCP/RCS format three-dimensional point cloud data which can be identified by Revit software by using an 'export' command.
The specific steps of the step (5) are as follows: and creating project overall engineering in the Revit software, setting N/S, E/W, elevation and angle base point coordinates of the project overall engineering, and inputting coordinate values of the three-dimensional point cloud, so that consistency of the creation coordinate system and the point cloud coordinate system of each block building information model is ensured.
The building information model is integrated into a whole by adopting the relevance based on the building function partition and the convenience of modeling, and the coordinate system of each partitioned building information model is ensured to be consistent with the coordinate system of the point cloud, so that the deviation during multi-model integration is avoided, and the modification and adjustment of the later partitioned model are facilitated. The method solves the problems of low reverse modeling efficiency and poor operation convenience in arrangement caused by overlarge point cloud information, and ensures the integrity of the project building information model and the consistency of three-dimensional point cloud data and building information model data.
Drawings
FIG. 1 is a general flow chart of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the method for creating and integrating the blocking model of the point cloud is characterized by comprising the following steps:
(1) Acquiring three-dimensional point cloud data of a live-action, wherein file formats are las, laz, ptx and txt, and the point cloud scanning precision is required to be not lower than 5mm;
(2) Analyzing the functional characteristics and the correlation of each area of a building according to the point cloud range, determining the partitioning standard of the building, dividing the whole point cloud information into outdoor point clouds and indoor point clouds according to indoor and outdoor partitioning and each building partitioning in sequence, and dividing the indoor point clouds into single building point clouds according to the building if a plurality of buildings exist; if the monolithic modeling area of the building is greater than 5000m 2 Partitioning again according to floors of a single building, wherein coordinates of point cloud data are not changed after partitioning; the method comprises the following specific steps: separating the indoor and outdoor parts with planar layout and vertical layout and building space, and building with independent building functions, and building model building process with floor division 2 In the process, the modeling operation is inconvenient because of excessive elements of the point cloud data, and limitation is made, the blocks are partitioned again according to the floors of a single building, and the coordinates of the point cloud data are not changed after the blocks are partitioned.
(3) Importing the three-dimensional point cloud data into Cloudcompare software, partitioning according to the standard of the step (2), and exporting partitioned three-dimensional point cloud data after partitioning; the method comprises the following specific steps: importing the three-dimensional point cloud data into Cloudcompare software, drawing a point cloud dividing line according to the determined area range, and performing three-dimensional point cloud data blocking by applying a segment in and segment out command of the Cloudcompare software according to the rule determined in the step (2), and deriving blocked three-dimensional point cloud data after the blocking is completed;
(4) Importing the segmented three-dimensional point cloud data into Autodesk RECap software for format conversion, opening the Autodesk RECap software, selecting 'Scan project', creating a point cloud project, selecting a storage path, selecting a segmented three-dimensional point cloud data file, clicking 'import files' and 'index screens' options in sequence, waiting for the segmented three-dimensional point cloud data to be loaded, clicking 'laboratory project', displaying a segmented three-dimensional point cloud data image by the Autodesk RECap software, and selecting 'export' to export the segmented three-dimensional point cloud data to obtain RCP/RCS format three-dimensional point cloud data which can be identified by the Revit software;
(5) Creating project overall engineering in the Revit software, setting N/S, E/W, elevation and angle base point coordinates of the project overall engineering, opening a measuring point and a project base point in a field through the visibility setting of the Revit software, and inputting coordinate systems of the project base point and a shared field in sequence according to coordinate system data of a point cloud, so as to ensure that the created coordinate system of each block building information model is consistent with a point cloud coordinate system.
(6) Respectively creating a block Revit engineering project, wherein the project is defined as rvt1 and 2 … … N, and N is a natural number larger than 2;
(7) Respectively linking the partitioned RCP/RCS format three-dimensional point cloud data of the step (4) in rvt and 2 … … N projects, forming a three-dimensional point cloud image in Revit software, and creating each partitioned building information model according to the point cloud outline;
(8) Opening project overall project rvt0, sequentially linking the partitioned revit models rvt, 2 … … N respectively, and releasing project coordinates of the current project overall project rvt0 to respectively enable the linked partitioned revit models to obtain project overall project coordinates of rvt 0;
(9) In the project overall project rvt0, all the block revit models rvt, 2 … … N are linked by shared coordinates, and integration of all the block building information models is performed to form an overall building information model;
(10) And (3) a nwc-format light-weight integral building information model is derived from the integral engineering rvt0 model, a nwc-format integral building information light-weight model and the initial three-dimensional point cloud data in the step (1) are imported in Navisworks software, consistency check is carried out, if the deviation value is within a certain allowable range, the integral building information model creation work is completed, otherwise, the step (1) is returned to check the accuracy of the point cloud or the step (7) is returned to modify each block building information model.
And (5) and (8) using a coordinate system unified with the point cloud for the whole engineering of the block building information model and the project, and integrating the block building information model and the project into a whole after the block, thereby avoiding deviation during the integration of multiple models.
The invention can solve the problems of large scale and more nonlinear complex elements of the building, and inconvenient reverse modeling by utilizing the whole three-dimensional scanning data when the whole three-dimensional scanning data is overlarge, and adopts the concept of block integration, thereby being convenient, simple and efficient in operation.
The present invention has been described in terms of the preferred embodiments, and it will be apparent to those skilled in the art that many changes and modifications can be made to the disclosed technology without departing from the scope of the invention, or the equivalent embodiments can be modified in equivalent ways. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall fall within the scope of the technical solution of the present invention.
Claims (5)
1. A method for creating and integrating a partitioned building information model of a point cloud is characterized by comprising the following steps:
(1) Acquiring three-dimensional point cloud data of a live-action, wherein file formats are las, laz, ptx and txt, and the point cloud scanning precision is required to be not lower than 5mm;
(2) Analyzing the functional characteristics and the correlation of each area of a building according to the point cloud range, determining the partitioning standard of the building, dividing the whole point cloud information into outdoor point clouds and indoor point clouds according to indoor and outdoor partitioning and each building partitioning in sequence, and dividing the indoor point clouds into single building point clouds according to the building if a plurality of buildings exist; if the building is constructedThe single block modeling area is more than 5000m 2 Partitioning again according to floors of a single building, wherein coordinates of point cloud data are not changed after partitioning;
(3) Importing the three-dimensional point cloud data into Cloudcompare software, partitioning according to the standard of the step (2), and exporting partitioned three-dimensional point cloud data after partitioning;
(4) Importing the partitioned three-dimensional point cloud data into Autodesk RECap software for format conversion, and exporting RCP/RCS format three-dimensional point cloud data which can be identified by Revit software;
(5) Creating project overall engineering in Revit software, defining the project overall engineering as rvt0, and ensuring that the coordinate system of each block building information model is consistent with the point cloud coordinate system;
(6) Respectively creating a block Revit engineering project, wherein the project is defined as rvt1 and 2 … … N, and N is a natural number larger than 2;
(7) Respectively linking the partitioned RCP/RCS format three-dimensional point cloud data of the step (4) in rvt and 2 … … N projects, forming a three-dimensional point cloud image in Revit software, and creating each partitioned building information model according to the point cloud outline;
(8) Opening project overall project rvt0, sequentially linking the partitioned revit models rvt, 2 … … N respectively, and releasing project coordinates of the current project overall project rvt0 to respectively enable the linked partitioned revit models to obtain project overall project coordinates of rvt 0;
(9) In the project overall project rvt0, all the block revit models rvt, 2 … … N are linked by shared coordinates, and integration of all the block building information models is performed to form an overall building information model;
(10) And (3) a nwc-format light-weight integral building information model is derived from the integral engineering rvt0 model, a nwc-format integral building information light-weight model and the initial three-dimensional point cloud data in the step (1) are imported in Navisworks software, consistency check is carried out, if the deviation value is within a certain allowable range, the integral building information model creation work is completed, otherwise, the step (1) is returned to check the accuracy of the point cloud or the step (7) is returned to modify each block building information model.
2. The method according to claim 1A method for creating and integrating a blocking model of a point cloud is characterized by comprising the following steps: in the step (2), referring to the point cloud range, analyzing the functional characteristics and the correlation of each area of the building, and determining the partitioning standard of the building, wherein the specific steps are as follows: separating the indoor and outdoor parts with planar layout and vertical layout and building space, and building with independent building functions, and building model building process with floor division 2 In the process, the modeling operation is inconvenient because of excessive elements of the point cloud data, and limitation is made, the blocks are partitioned again according to the floors of a single building, and the coordinates of the point cloud data are not changed after the blocks are partitioned.
3. The method for creating and integrating the blocking model of the point cloud according to claim 1, wherein the method comprises the following steps: the specific steps of the step (3) are as follows: and (3) importing the three-dimensional point cloud data into Cloudcompare software, drawing a point cloud dividing line according to the determined area range, and carrying out three-dimensional point cloud data blocking by applying a segment in command and a segment out command of the Cloudcompare software according to the rule determined in the step (2), and after the blocking is completed, exporting blocked three-dimensional point cloud data.
4. The method for creating and integrating the blocking model of the point cloud according to claim 1, wherein the method comprises the following steps: the specific steps of the step (4) are as follows: the method comprises the steps of importing partitioned three-dimensional point cloud data by using an Autodesk RECap software by using an 'import files' command and an 'index scan' command, loading a partitioned three-dimensional point cloud data image by using a 'launch project' command, and finally exporting RCP/RCS format three-dimensional point cloud data which can be identified by Revit software by using an 'export' command.
5. The method for creating and integrating the blocking model of the point cloud according to claim 1, wherein the method comprises the following steps: the specific steps of the step (5) are as follows: and creating project overall engineering in the Revit software, setting N/S, E/W, elevation and angle base point coordinates of the project overall engineering, and inputting coordinate values of the three-dimensional point cloud, so that consistency of the creation coordinate system and the point cloud coordinate system of each block building information model is ensured.
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