Livelli di informazione e di sviluppo nella modellazione informativa degli edifici storici (HBIM) per il restauro

Building information models of heritage buildings (HBIM) have become a common practice, which did not stimulate a conceptual debate on how they should be defined, which information should they contain and what role can they play in restoration practice. Most of HBIM are used for documentation purposes and data management during the exploratory study of heritage buildings, but shared framework and standards do not exist. Starting from a review of the concept of level of development, and the associated levels of information and graphic detail, a framework for their application to HBIM is proposed, specifying the case of as-built models. In addition to scan-to-BIM and parametric models, two new levels are suggested, at urban and architectural scale respectively. These rely on translating information from the graphic component of HBIM to the descriptive one, as architectural elements are decomposed in their constitutive parts at functional and constructive levels. The semantic decomposition of heritage buildings and the explicit usage of IFC, underlaying each HBIM, unleash interoperability among software and collaboration among expert around s single model. Finally, a few examples of HBIM defined according to the new LOD are shown.