HOW WE PROCESS POINT CLOUDS?
Laser scanners can generate a point cloud that spatially depicts the visible elements of a historic building’s (interior and external) surfaces. Working with a laser scanner is divided into three major parts. First, a general workplan is devised, and scanning locations are chosen.
The fieldwork, which includes collecting scanning and/or topographic data, is then carried out. Finally, according to the design, the scanner is put at the defined locations to avoid concealed areas or shadows in the point clouds, and data is captured.
Data from the previous stage is analysed and structured in this step before being fed into the BIM environment.
A sequence of procedures, such as cleaning and filtering, must be completed before the raw point cloud may be used. Cleaning and filtering are done with point cloud handling software (such as Recap). Because some high-level interpretation of the scene may be necessary, this is typically a user-aided procedure by a member of our conservation team.
Finally the data may be imported and stored in the BIM environment, allowing for precise and efficient modelling of the various architectural components.
As historic buildings or monuments frequently exhibit various deformations caused by the passage of time or structural issues, such as sloping walls, cracks, or missing pieces. The real shape and spaces of the buildings are provided by point clouds, which is critical for generating an accurate representation of each component.
The elements are first divided into regular and irregular surfaces in order to address the appropriate modelling of architectural artefacts. Elements with many features, such as capitals, archivolts, and embellishments, will be assumed to be uneven or organic surfaces and will be depicted in their fundamental form. Columns, walls, windows, and doors, for example, will be assumed to be normal surfaces and will be detailed modelled. Elements that are critical to the overall architecture will be presumed to be regular surfaces as well.