3D VIRTUAL RECONSTRUCTION OF AN URBAN HISTORICAL SPACE: A CONSIDERATION ON THE METHOD

Urban historical spaces are often characterized by a variety of shapes, geometries, volumes, materials. Their virtual reconstructionrequires a critical approach in terms of acquired data‘s density, timing optimization, final product’s quality and slimness.The research team has focused its attention on the study on Francesco Neglia square (previously named Saint Thomas square) inEnna. This square is an urban space fronted by architectures which present historical and stylistic differences. For example you canfind the Saint Thomas’church belfry (in aragounese-catalan stile dated XIV century) and the porch, the Anime Sante baroque’schurch (XVII century), Saint Mary of the Grace’s nunnery (XVIII century) and as well as some civil buildings of minor importancebuilt in the mid twentieth century.The research has compared two different modeling tools approaches: the first one is based on the construction of triangulatedsurfaces which are segmented and simplified; the second one is based on the detection of surfaces geometrical features, the extractionof the more significant profiles by using a software dedicated to the elaboration of cloud points and the subsequent mathematicalreconstruction by using a 3d modelling software. The following step was aimed to process the virtual reconstruction of urban sceneby assembling the single optimized models.This work highlighted the importance of the image of the operator and of its cultural contribution, essential to recognize geometrieswhich generates surfaces in order to create high quality semantic models.