1. Current situation and standards

All too often today, projects designed using BIM are still no more than a simple graphic representation with little technical content.

CAD tools, or BIM as they are known, are first and foremost drawing tools, which publishers have supplemented with semantic fields. All have more or less adopted a common library: wall, slab, roof, column, beam, staircase, door, window...

Figure 1 shows an example of how to represent a wall object in a CAD tool.