Earlier, Google implemented Sketch Up from ‘Last Software’ company- an easy-to-use scanning tool. Used for content creation, to upload 3D models of Google Earth or Google Maps, the Sketch Up technique matched well into Google’ mission. The mission organizes the world’s information into a common platform. Yet, it did not turn out as expected. Google revealed a cost-effective way of reconstructing and indexing building exteriors of the as-built. Through the eyes of Photogrammetry, Google added accuracy to the building design. But, the journey had some shortcomings. So, came the birth of laser scanning.
Modern Day Technique – Point Cloud Scan to BIM Modeling
Point cloud 3d scan to BIM represents the external surface of a building with its geometry. Scan to BIM process facilitates in eliminating expensive mistakes during building construction. The building data are extracted during point cloud scan to BIM modeling. The technique analyzes the existing building condition for renovation and demolition. Laser scan to BIM services used by BIM modeling companies, facilitate clash detection. The technology coordinates clashes amongst various building services, by creating an accurate digital reproduction of point cloud models.
What are the Deliverables of Laser Scan to BIM Services?
- 3D BIM Modeling for Renovation & Extension – 3D Model gets created as per point cloud scan to BIM for improving transparency & streamlining communication. BIM also supports decision making during the as-Built phase of the construction.
- As-Built BIM Modeling & Drawings – As-Built drawings are created from as built models for Plan, Elevation & Section Sheet. As-Built modeling for renovation also provides a comprehensive tool for the planning of projects from laser scan point cloud.
- BIM 4D Construction Scheduling – Automated BIM based construction is monitored through 4D scheduling through point cloud. 3D laser scanning to BIM Modeling facilitates the renovation of old buildings.
- BIM Facility Management – BIM enables construction team members to combine submittals from point cloud scan during project renovation through facility operations and management. BIM engineers provide complete contact records of the project in relevant fields.
Laser Scan to BIM process
Let’s delve into the details of “How to make laser scans for BIM modeling?”. Modeling is the platform, where point clouds get shaped into a digital platform. A real-life scan of the construction project is undertaken through BIM point cloud model. The steps of scan to BIM modeling encompass model verification, point cloud scan in Revit, file set-up, modeling, collaboration and quality assurance.
(i) Model Verification – Before creating the model, it is significant to determine a clear scope of work. This defines the services to be included, excluded as well as the Level of Details required by clients. A clearly defined tolerance level for Scan to BIM execution, begins with modeling, verifying coordinates of point cloud. Popular software applications used in 3d scan to BIM process include Revit, AutoCAD, SketchUp, ArchiCAD, Navisworks, Vectorworks, Plant 3D, etc.
(ii) Point Cloud Scan in Revit – After model verification, point cloud scans are inserted in the Revit model. Once several point cloud files are available, it becomes essential to assure the integrity, by coordinating all files. As soon as the scans are inserted into Revit, the model is locked down with pin tools for pinning to specific locations. This enhances the speed while the mouse passes over a point cloud scan.
(iii) Setting-Up Files – To begin the process of setting up files in Revit, worksets should be created as per project requirement. Companies providing scan to BIM services work with different worksets for each Point Cloud to fix VVGG settings. BIM engineers turn them on and off, as per necessity. As a result of which, the opening time of the file gets reduced. It’s vital to use diverse worksets for elements imported from conversion tools. However, for setting up the levels from a section view, it is essential to lock it first. The steps followed for file setup include:
- Level 0/Zero BIM: This should be set through the origin of Point Cloud Scan.
- Building Level: It depends to a great extent as per the construction project. Modelers must set the level line, through a representative part of the 3d floor, shown by point cloud. To set up various levels in the model, at a time, the section needs to be placed through the stair core.
- Setting Plan View: It would be set as per the levels created by the 3d BIM modeler.
- Girds: Girds should be established by using the main building floor. A clear purpose of the grid system needs to be maintained throughout the model with steady distance.
(iv) Scan to BIM Modeling – Point cloud scan to BIM model has to be created, following the strategies of BIM execution plan. Every building element gets modeled as an accurate Revit element. Sometimes, single column is used, instead of a generic model with an extrusion process. It is essential for all building elements to be hosted, to the corresponding levels. The model walls must be best fitted to point cloud. It is executed by cutting a thin view angel in plan and section views. While creating a 3d scan to BIM model of a perimeter wall in a plan view, the Interior/Exterior Finish must be chosen, to match the wall face location. The drive is to update the real data of wall thickness subsequently. Consequently, the established perimeter continues to stay in the right place.
(v) Collaboration – In a scan to BIM process, collaboration is needed while coming to 3D modeling. Every necessary information has to be communicated in a clear way with all project stakeholders. All team members involved in the process should get access to the same storage disc of the point cloud. All AEC participants save files in their own systems and access files from there. BIM modelers also use compatible versions and software applications in the scan to BIM process. During project collaboration, they obtain a control model to set up the levels, grids, and shared coordinates. The technique doesn’t allow any project participants to alter or delete information. So, this enables Revit scan to BIM modelers to work on heavy files and get a backup.
(vi) Quality Assurance – Scan to BIM companies follow quality assurance or quality control processes, after modeling to ensure the quality of the model. First of all, they perform a quick model check, by moving a section throughout the project. Using the visibility options for reviewing specified elements, it is recommended to make a detailed comparison of a demarcated area through plans, sections and 3D views. Companies providing scan to bim services detect and coordinate clashes amongst various services, including structural, architectural, mechanical, electrical, plumbing and fire protection. Navisworks software application is also used by the BIM modeling companies to provide an easier way of navigating a Revit BIM Model.
How Much Does Point Cloud Scan to BIM Cost?
AEC professionals are eager to know about ‘How much does scan to BIM cost?’ ‘How much do scan to BIM companies charge?’ ‘How much the clients are willing to pay for 3d scan to BIM modeling of an as-built structure?’
Here are the Reasons for the varied costs of Scan to BIM Process.
Converting an as-built building to a detailed 3D model, gets varied dramatically in diverse markets. This is due to following causes:
- Different techniques & equipment for measurement
Different scan to BIM companies use various methodologies and equipment for measurement. The techniques bring a great impact on how much detail to be captured in a single visit, as per accuracy.
- Process of accurate structural measurement of a facility
Scan to BIM cost also varies as per the process of accurate measurement of a building structure. Sometimes, the measurement of a facility cannot be executed on a working day or a weekend. This varies according to the type of facilities, including medical center, shopping center, restaurant, etc.
- Level of Detailing (LOD) requirement
Scan to BIM cost also depends to a great extent on the level of details, used to create a 3d model from as-built structures. To take an instance, a point cloud scan to BIM model of a restaurant may require an entirely different LOD, compared to a medical facility or an office building. The Level of Detailing included in the 3D model, makes a significant impact on the cost. Calculating costs through conventional techniques vary within the range of USD 2/sq. ft. for an office to USD 4/sq. ft. for a restaurant or a medical facility.
- Complexity of 3d floor plan & type of facility
Scan to BIM costs also depend to a great extent on how the contractors and the service providers offer the price estimate. It depends on the complexity of 3d floor plans and types of the building facility. This is directly proportional to the hours, required for structural building measurement to create a 3d floor plan or a 3d model.
Companies providing scan to BIM services are using 360 degree photos and LiDAR scanners to resolve or standardize the problems. The difference in digitized 3D images and LiDAR scans, compared to conventional technique is the quantity of information captured in a single visit in a non-intrusive manner. Further, this information could be filtered and processed at off-site locations, like a cloud processing pipe, in an automated workflow. To know more about laser scan to BIM, consult one of the top BIM service providers in USA. To implement point cloud scan to BIM process, best scan to BIM modeling firms in USA work with Revit scan to BIM modeling. The technique forms a digital representation of existing conditions of the structure with its physical and functional attributes. Contact Tejjy Inc. Point Cloud Scan to BIM modeling company in USA at 202-465-4830 or [email protected] and coordinate architectural, structural and MEPFP services in an accurate manner.