A typical building complex, but complex to interpret
Behind an apparent volumetric simplicity, this type of building quickly reveals a more nuanced reality. A horizontally-developed commercial base, largely open and technical, supports a vertical tower where offices and housing are superimposed.
Circulation routes are not always obvious, levels do not always correspond to each other, and the links between volumes have often changed over time. As is often the case with this type of building, the existing plans no longer provide a precise understanding of the actual state.
This is precisely where 3D surveying comes into its own.
Capturing the whole picture
The work was carried out using a 3D laser scanner over the entire building, with a global approach. Interiors, façades, roofs and the immediate surroundings were surveyed continuously to provide a complete view of the building.
Scanning is carried out in a single pass, with the scanner positioned at ground level, so that spaces can be read uniformly. This method captures not only the main volumes, but also the offsets, irregularities and specific features of the existing building.
In some areas, particularly on roofs or facades, additional photographs have been taken to complete the information and ensure continuity.
From the point cloud to a reliable database
Once the survey has been completed, the data is assembled to produce a unified point cloud. This cloud becomes a faithful representation of the building, in which every visible element has its place.
More than just a capture, this is a real working tool. Project teams can refer to it to understand volumes, check alignments, anticipate interventions or simply situate themselves within the existing structure.
The building is structured by levels and zones, so that it can be viewed progressively, which is essential in a complex of this kind.
BIM modelling at the service of the project
From this base, a digital model of the building is developed. The aim is not to produce an abstraction, but to transcribe as accurately as possible what can be observed.
The modelling is based on a BIM approach, with a level of detail adapted to the existing structure. The volumes are structured, the main elements are integrated, and the whole becomes a coherent working tool for the contractors.
In this type of project, the model plays a central role. It enables us to move from a sometimes fragmented view of the building to an overall, organised and usable understanding.
