Integrated Survey of “Quadrature” Aimed at the Graphical Analysis of Painted Perspective. Trompe l’Oeil Architecture, Palazzo Arese Borromeo

The issue of knowledge and documentation of cultural heritage is always central in the field of Drawing, which, through the survey, has always been preliminary to the safeguarding and valori-sation of artistic and architectural heritage. The paper aims at presenting some results of a survey realized following an approach that mix direct, laser and photographic techniques to obtain high quality ortophotos of the painted surfaces, useful to be the basis for the graphical analysis of the trompe l’oeil perspective. The phases are: survey campaign and data acquisition, postproduction of the RAW file, photo straightening, photo modelling, orthophoto output, CAD analysis, conclusive considerations. All these steps are referred to the experimentation on a concrete case study, one of the numerous frescoed rooms belonging to the rich iconography of Palazzo Arese Borromeo in Cesano Maderno (MB, Italy), a building that is an actual unicum in its kind.