The advance of information technology has enabled in recent years new fruition scenarios for cultural heritage sites. Multidisciplinary approaches integrate survey techniques with multimodal interfaces to allow enhanced fruition for larger group of users. In this paper we propose a multimodal interface to a virtual representation of a medieval ceiling, built in the XIV century, which covers the "Sala Magna" of Steri, the historical headquarters of the University of Palermo, in Italy. This research deals with the definition of a process for the integration of surveying techniques, modelling processes and communication technologies for the documentation of such artifacts. This is a two-stage process: in the first stage, a 3D digital document is produced that describes the artifact; in the second stage, a multimodal guide interacting with the 3D model is developed. A prototype multimodal guide has been implemented to narrate the Trojan Cycle, depicted on two of the rafters in the ceiling. This prototype was demonstrated to the general public and is detailed in the paper.

Abstract. In recent years research works have shown that augmented reality tools can offer effective support for the dissemination of architectural heritage, when integrated into the information data extracted with surveying and representation tools and further data from other sources, e.g., history.The development and permanent updating of software platforms dedicated to augmented reality, i.e., Apple's ARKit and Google's ARCore, as well as the introduction of new features, offer today affordable support for the development of AR solutions.Some operational difficulties are due to the rapid and constant evolution of the technologies; the available solutions can be compared to prototypes and the development of user experience effective solutions appears still lacking. The main subject in the construction of AR solutions is still linked to the development of effective methods to properly set up the visualization of 3D models and their interaction with the real scene. The chosen case study for the test of persistent AR solution for the visualization of works of art is the ‘Tribuna’, i.e., a monumental and sculptural marble apparatus, that decorated the main apse of the Cathedral of Palermo.

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The study focuses on the use of 3D surveying and digital representation tools for the purpose of documenting archaeological monuments whose restoration involves the disassembly and repositioning of blocks. The case study in question is a building at the west end of the San Biagio archaic sanctuary, located within the archaeological site of Agrigento. The monument is a rectangular building encompassing two pools, whose foundations are suffering from deep decay and there are large spaces between the walls which have become disconnected. Surveying and 3D modelling have been used to illustrate the existing state of the building. Plans, sections and orthophotos have been created to support the indexing of ashlars and to evaluate the structural decay. A 3D model of the most dilapidated part of the building, the north-eastern corner, has been constructed in order to document the direction of the ashlars and where they are positioned in relation to each other. Finally, a restoration model of this building been built.