Ar Methods for the Visualization of the Lost Marble “Tribuna” in the Main Apse of the Cathedral of Palermo

Abstract

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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“…This last step allows importing the models within the AR development software. Changing the settings of Unity Reflect enables working with the Vuforia AR Support mode [67]. After importing the ".fbx" files containing the four phases of the model into the "File/Building Setting" and then into the "Player Settings", in the "Inspector" area it is possible to access the properties window to change the settings found in the XR Setting field, choosing the AR mode.…”

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“…Specifically, two different AR technologies were tested: one based on the use of persistent anchors stored on the cloud, and the other based on object tracking and recognition. Although the solutions tested employed different approaches, they both allowed digital models to be referenced to real space with automatic and instantaneous processes, making the AR experience persistent over time and easy for users to access (Cannella, 2022).…”

“…An AR histogram placed at the anchor allowed the operator to correctly record the area of interest by making slow movements around the anchor while constantly framing the insertion point. Following this procedure, the spatial information was sent and stored on the cloud (Cannella, M. 2022).…”