Anagrapheus. La costruzione di modelli digitali per la conservazione del patrimonio culturale.

Anagrapheus is the executive drawing of the decorative and structural elements made directly on parts of built architecture by engraving in 1: 1 scale. It belong to an antiquity constructive methodology known as "worksite tracing”. They have a very important role in the different phases of the construction site: concept, representation, control, assembly of constructive and decorative elements. Nowaday, the known process of integrated survey make it possible to acquire the worksite tracing and extract digital models useful in the case of collapse, or neglect, or when there is any documentation of the building. This research focuses on the Cathedral of Terni, affected by an extended corpus of representatives worksite tracing of some architectural elements of the façade in 1: 1 scale. Through an historical analysis of the worksite tracing and an integrated survey, conducted alongside traditional techniques to methodologies for the 3D massive acquisition, it has been possible to build digital models that provide a valuable contribution to the knowledge and conservative operations. The value of the worksite tracing is in the possibility to employ real original drawings that provide unique information of some parts of ancient artifacts.