The Roman Theatre of Clvnia: Hybrid Strategies for Applying Virtual Reality on Laser Scanning 3d Files

Digital acquisition, processing and visualization of archaeological sites require increasing performance for software tools. The application of hybrid methodologies based on digital information poses new challenges for satisfying professional and entertainment requirements, helping to have a better understanding of archaeological sites. A faithful representation of the current state is displayed by combining high resolution photogrammetric recording with Computer Vision to provide an accurate 3D model of the archaeological site. The aim of this work is to construct a 3D model for the roman theatre of Clvnia, a very large archaeological site to provide an assessment about conservation and restoration policy. To achieve it, a feedback between bottom-up approach for processing and top-down for visualizing is performed from dense clouds of 3D points captured with an ILRIS 3D scanner of Optech. The superposition of meshes and maps of level curves provides friendly visualizations with a low cost. In our approach, slices of clouds of 3D points are exported to CAD for cartographic, planimetric and visualization purposes, including Digital Elevation Maps of the archaeological site. Fitting of geometric primitives is semi-automatically performed in an interactive way. A Virtual Reality module is developed for adapting exported slices of laser scanning files and for obtaining a realistic rendering. The hybrid methodology developed in this work is enough flexible to be adapted to another environments, including urban scenarios or isolated buildings in Cultural Heritage surveying. * Corresponding author.