## 7 Building Information Modeling: Knowledge Base
### Building Information Modeling: Realization Phase  
For the creation of the HBIM model, a point cloud from terrestrial laser scanning and photogrammetry was registered and cleaned. Since the target was the historical building, there were various ornaments on the facade, decorative casings, columns and other structures. The scan-to-BIM method was used, i.e., a point cloud served directly as the basis for the software in which the HBIM model was created. It was not appropriate to create the mesh or solid model from a point cloud in the CAD environment, since such modeling would only be time consuming and would not bring any benefits. Such a procedure is suitable for buildings such as production halls or industrial buildings. As mentioned several times, the emphasis was on both the accuracy of the data and the reliable capture of the existing condition of the object. Therefore, in cases when the basic dimensions of the object were directly modeled, it was no longer possible to simplify the structures either in the dimensions or in the direction (i.e., there are no parallel walls in the building). To add more information to the HBIM, two more geomagnetic and ferromagnetic scanners were used during object scanning and photography. One scanned and determined the material composition of individual structures, the other, ferromagnetic one, scanned and determined the distribution and diameter of the reinforcement of load-bearing walls and ceiling boards (decks). Due to the poor technical condition of the aboveground floors of the building and factors such as humidity, and building materials containing metal, substrates with cavities or tiles, the required data could not be obtained. Due to the high year-round humidity, it was not even possible to scan the basement using a geomagnetic scanner. Nevertheless, during scanning with a non-humidity-sensitive ferromagnetic scanner, the results in specific areas of the basement were very skewed. We assume that the entire measured area of the basement was made of reinforced concrete in combination with steel elements, and the data were distorted due to the high content of ferromagnetic metals. Therefore, invasive methods for the material composition determination were finally chosen (performed during the reconstruction). To conclude, at the time of the HBIM model creation, it was not possible to bring this information into the design of the model itself. The system families of software were fully used in the creation of reinforced concrete slabs and floors. These constructions were relatively easy to identify from the scan. This was because of the fact that most of them were exposed by fire and the accuracy of technologies used in construction at beginning of the last century. A special group of objects examined during the creation of the HBIM model was formed by walls, where it was not possible to determine their material composition, for the same reason as already mentioned. Based on experience of similar projects, it was possible to estimate with significant certainty the material composition of individual walls, and a new wall type was created for each wall thickness. The walls of the building were made of solid fired bricks and in the combination of their connections they differed only in the thickness of the plaster. From the architectural point of view, high-precision shapes were required for vaults, so it was not possible to create a group for repetitive elements, as each vault differed in details. Therefore, vaults were created by the model-in-place system. This is a problem of HBIM where the ideal model is not achieved, but the process is reversed, and the model is an abstraction of reality [49]. Windows were defined as a group of families. Despite the fact that they were destroyed and only parts of them were preserved, it was possible to create a window with casing on a facade frontage. Casings were categorized as the wall additions and fully parametric.