Rilievo 3D e Ricostruzione Digitale della Fortezza di Bergamo: la tenaglia di Sant’Agostino e la cannoniera di San Michele

The Fortress of Bergamo is an imposing architectural construction dating back to the 16th century characterized by a well-preserved city wall and a linear development of over 5 kilometers; in 2017 it was registered in the UNESCO World Heritage Site as a world heritage site. As part of the studies aimed at its conservation and valorization, a pilot project was launched on the gunboat of San Michele, an underground environment on the sides of the bastion and designated for "flanked cannonade" for the defense of the gate of Sant’Agostino on the street for Venice. The essay aims to illustrate the knowledge project resulting from the historical investigation, the metricmaterial and diagnostic survey, the graphic processing and the virtual restoration of the models and textures underlying the 3D rendering of the factory. A focus on new technologies aimed at communicating and enjoying cultural heritage resulting from an initial study of documentary sources, followed by precise mapping conducted on digital models, faithful copies of reality thanks to 3D laser scanner technology and HDR photogrammetry. The work allowed us to take an immersive journey in space and time right into the underground walls of the Walls at the end of the sixteenth century, in a virtual tour among bombers and men-at-arms grappling with cannons, fire buttresses, pikes and halberds.