Two Methods of Optimization for an AR Project: Mesh Retopology and Use of PBR Materials

  • M. PerticariniEmail author
  • C. Callegaro
  • F. Carraro
  • A. Mazzariol
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 1140)


In an augmented reality project dealing with complex objects with a large scale, it is necessary to minimize the number of polygons of a mesh. The challenge is trying to find a compromise between accuracy, details and fluidity of the representation. Starting from two different surveys (Laser Scanner and Photogrammetry) with high resolution, two paths have been identified: the first one consists on the retopology of the mesh obtained from the point cloud with the help of software like Instant Mesh; the second one relies on the complete re-modelling of the artefact, trying to simplify its structure in macro-elements using Retopoflow tool in Blender. The level of detail is preserved in both cases: in the first, the “quad mesh” keeps complex geometries minimizing the number of polygons; in the other an accurate management of texture of PBR materials returns realism with simple shapes, with a lower number of polygons. These methods have been applied to the reconstruction of San Lorenzo Bridge, one of the ancient monuments of the Roman Padova no longer visible, examined by the research project PD-Invisible. Results validate that the second method is more effective, ensuring an excellent realism in the rendering phases, minimizing the size of the file.


Point cloud Quad mesh Cultural heritage Retopology PBR Photogrammetry 



The activity presented in the paper is part of the research grant “FSE 2105-18-11-2018, PD-Invisible: PaDova INnovative VISions – visualizations and Imaginings Behind the city Learning”. We would like to express our appreciation to Comune di Padova, Musei Civici agli Eremitani and Soprintendenza Archeologia, Belle Arti e Paesaggio per l’area metropolitana di Venezia e le province di Βelluno, Padova e Treviso for the endorsement and the collaboration.


  1. Aiello, D., Basso, A., Spena, M.T., D’Agostino, G., Montedoro, U., Galizia, M., Grasso, R., Santagati, C.: The virtual batcave: a project for the safeguard of a Unesco Whl Fragile ecosystem. In: ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol. XLII-2/W9, pp. 17–24 (2019)Google Scholar
  2. Baik, A.: From point cloud to Jeddah Heritage BIM Nasif historical house – case study. Digit. Appl. Archaeol. Cult. Herit. 4, 1–18 (2017)Google Scholar
  3. Barazzetti, L., Banfi, F.: Historic BIM for mobile VR/AR applications. In: Mixed Reality and Gamification for Cultural Heritage, pp. 271–290. Springer, New York (2017)Google Scholar
  4. Battini, C., Vecchiattini, R.: Survey and restoration: new ways of interaction. In: ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XLII-2/5W1, pp. 655–662 (2017)Google Scholar
  5. Bommes, D., Lévy, B., Pietroni, N., Puppo, E., Silva, C., Tarini, M., Zorin, D.: State of the art in quad meshing. In: Eurographics STARS, pp. 1–24 (2012)Google Scholar
  6. Bonetto, J., Pettenò, E., Veronese, F.: Padova. La città di Tito Livio, Cleup, Padova (2017)Google Scholar
  7. Bosio, L., De Fogolari, G., Chieco Bianchi, A.M., Pellegrini, G.B., Sartori, F., Bassignano, M.S., Prosdocimi, A., Forlati Tamaro, B.: Padova antica. Da comunità paleoveneta a città romano-cristiana, Edizioni Lint, Trieste (1981)Google Scholar
  8. Braccesi, L., Veronese, F.: Padova romana: da Augusto a Teodorico. Cierre, Verona (2014)Google Scholar
  9. Cipriano, S., Mazzocchin, S.: Bonifiche con anfore a Padova: note di aggiornamento alla cronologia e alla distribuzione topografica. Tra protostoria e storia. Studi in onore di Loredana Capuis, pp. 331–367. Quasar, Roma (2011)Google Scholar
  10. Fabbrichesi, R.: Ponti romani in Padova, Colombo, Roma (1941)Google Scholar
  11. Galliazzo, V.: I ponti di Padova Romana. Saggio di archeologia urbanistica, Cedam, Padova (1971)Google Scholar
  12. Galliazzo, V.: I ponti romani, Canova, Treviso (1995)Google Scholar
  13. Gasparotto, C.: Padova romana, L’Erma di Bretschneider, Roma (1951)Google Scholar
  14. Huang, J., Zhou, Y., Niessner, M., Shewchuk, J.R., Guibas, L.J.: QuadriFlow: a scalable and robust method for quadrangulation. Comput. Graph. Forum 37(5), 147–160 (2018)CrossRefGoogle Scholar
  15. Huffman, K.L., Giordano, A., Bruzelius, C.: Visualizing Venice. Mapping and Modeling Time and Change in a City. Routledge, London (2018)Google Scholar
  16. Pesavento Mattioli, S.: Le prime sette miglia della strada romana da Padova ad Altino. Quaderni di Archeologia del Veneto 2, 126–134 (1986)Google Scholar
  17. Qian, K., Li, Y., Su, K., Zhang, J.: A measure-driven method for normal mapping and normal map design of 3D models. Multimed. Tools Appl. 77(24), 31969–31989 (2018)CrossRefGoogle Scholar
  18. Quattrini, R., Battini, C., Mammoli, R.: HBIM to VR. Semantic awareness and data enrichment interoperability for parametric libraries of historical architecture. In: ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol. XLII-2, pp. 937–943 (2018)Google Scholar
  19. Rizzoli, L.: Il ponte di San Lorenzo e gli altri ponti romani di Padova. Bollettino dell’Associazione dei Laureati nell’Università di Padova 12, 1–6 (1934)Google Scholar
  20. Rossi, C.: Le necropoli urbane di Padova romana. Padova University Press, Padova (2014)Google Scholar
  21. Tosi, G.: Aspetti urbanistici ed architettonici di Padova antica alla luce delle fonti storiche e di vecchi e nuovi rinvenimenti. Antenor 3, 87–127 (2002)Google Scholar

Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • M. Perticarini
    • 1
    Email author
  • C. Callegaro
    • 1
  • F. Carraro
    • 2
  • A. Mazzariol
    • 2
  1. 1.Department of Civil, Environmental and Architectural Engineering (ICEA)Università degli Studi di PadovaPaduaItaly
  2. 2.Department of Cultural Heritage (DBC)Università degli Studi di PadovaPaduaItaly

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