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Virtuality and documentation: Recreating the Byzantine heritage


3D reconstruction of the church
The main source of data was the regular surveying. Four plans in different levels of the church (from ground level up to the ceiling at the domes) and some fourteen cross-sections were produced. Besides control points for the rectification of the frescoes were surveyed at the same time.

Figure 15. Architectural plans, cross-sections, and photo drapping have been for the 3D reconstruction and realistic visualization of the main church



Figure 16. The 3D plastic model of the building has being augmented by rectified photomsaics of the interior frescoes. From these data, realistic walk-throughs have been designed.
An Electronic Indexing System of the frescoes
The Electronic Indexing of the interior frescoes has been developed as a web-based application in HTML language (Fig. 17). The navigation through the pages is done via :

• an alphabetically ordered name-index, or



• selection of the “theme” through the plans and the cross-sections (Fig. 18)

Figure 17. The Electronic Indexing System is a web-based HTML application

Video files, walk-throughs, VR models of the whole building with real images of the frescoes are also available from the same application.


Figure 18. The navigation through the Electronic Indexing System is done in a GIS-like manner.
Conclusions
In a wide-range documentation projects, like the one reported here, the time, cost, scale and accuracy requirements span a wide range. Different techniques, instrumentation and planning is required, while the size of the object and the use of the documentation records are the primary parameters. State-of-the art VR techniques provide real-world 3D-representations which are easily comprehented by non-experts. Although visualizations have their own value, accurate 3D-data are of absolute importance in documentations of monuments. “Smart” documentation of the frescoes calls for the development of GIS-like systems and the Internet environment proves itself a useful tool.

Bibliography

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• Georgiadis, Ch., 2000. The “Katholikon” of the holly Monastery of Dionysios in the Community of Mt. Athos, MSc. Thesis, School of Engineering, The Aristotle University of Thessaloniki (in Greek).



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• Wiedemann, A., 1997. Orthophototechnik in der Architekturphotogrammetrie. Möglichkeiten und Grenzen, Architek-turphotogrammetrie gestern, heute, morgen. TU-Berlin, pp. 79-94.