Conclusions. Notes on the reconstruction of painted architecture

The architectural structure designed by Pirro Ligorio for the fresco of the Oratorio di S. Giovanni Decollato in Rome is characterized by a vertical front articulated in a large central exedra, at the end of which a barrel vault gallery begins. The walls are structured by a series of gigantic Ionic semicolumns enriched by pairs of independent Solomonic columns and two orders of frames containing paintings and sculptures. A second order is partially visible only above the exedra. The reconstruction of the architectural structure was carried out in the following steps: a comparative study of the fresco and the preparatory drawing; a perspectival analysis of the two documents; a CAD reconstruction of the plan of the building; a reconstruction of the elevation based on the plan; and finally, corrections to individual parts based on control and optimization parameters.