3D modeling of Pompeii amphitheater. Preliminary critical considerations

Abstract This abstract continues the discussion of the research presented at the last year's Forum about some important activities carried out within the archaeological site of Pompeii. In particular, the study introduces survey, analysis and modeling activities performed for the amphitheatre, combining the themes of knowledge of a cultural site of great value with the aspects of the conservation and safeguarding of degraded heritage. The Spectacula of Pompeii, erected shortly after 80 B.C., is one of the most homogeneous buildings and better dating of Pompeii through the inscription that commemorates the construction (C.I.L., x, 852). The amphitheater of Pompeii, suitable for performances held there but not monumental, is the evolution of the architectural type of the amphitheater from false wooden construction to stable stone structure. Not changed nor extended by the consolidation restorations made after the earthquake of 62 A.D., the Pompeian amphitheater for its age is the oldest amphitheater architecture building. The complex spatial configuration of both elevation elements and underground spaces has allowed some significant geometrical and critical considerations that frame the construction techniques, as well as the following consolidation and restoration works. Specifically, the geometric analysis involved the identification of the planimetric shape, the slope of the stands and tiers, as well as assessments on the three-dimensional configuration of the auditorium space.