This paper provides a report of a research project on virtual revival of the Citadel of Bam, a UNESCO world heritage site in danger that was destroyed in an earthquake in 2003. The simulation of damaged buildings that lies along the primary axes of the citadel and 3-D reconstitution using state-of-the-art 3DCG tools are presented. The key approach to 3-D modeling of the destroyed buildings is complementary usage of heterogeneous data such as 2-D maps, photos, cartography maps, and sketches in collaboration between different teams. As the basic 2-D maps had error, analytic and comparative research is conducted on diverse data resources to create a knowledge-base for the 3DCG restoration of the site. The process of modeling is completed with regard to the complicated and curved mud brick buildings with traditional architectural details. For this purpose proper functions of the tools is selected and in some cases different tools are used. The modeling is done by linking the component with their semantic by a metadata-based layer naming process. The tasks of evaluating the historical, architectural, and technical details of the 3-D buildings are done in parallel with the modeling by a team of CG and architecture experts in order to increase the precision of the 3DCG reconstitution so that it can be used as a reference for the physical restoration. The first trial version of virtual reality demonstration of the main axes of the Citadel of Bam is described. The paper concludes with proposals to enhance the process of simulation and also to open the restricted views of the virtual reconstitution on Internet.
Buildings must pass the test of authenticity and integrity to be considered as World Heritage sites. The combination of these attributes can be referred to as the genuineness of the site.Bam suffered from a devastating earthquake in December 2003, but even after the disaster, the area was acknowledged to have a high degree of authenticity and integrity and was successfully put forward for consideration as a World Heritage site. Apart from the uniqueness of Bam's Citadel as the world's greatest mud brick structure and of a number of buildings in the immediate vicinity of the Citadel, the rationale for its inscription was also influenced by its intangible aspects and cultural landscape. Examples of intangible heritage in Bam include the legend of Haftvad and the Kot-e Kerm and its relation to the Silk Road as well as the beliefs of people of Bam in the rituals linked to the well of the Master of Time (Imam Zaman), and the ritual of Ashura.Until recently, the integrity of a World Heritage site was mostly assessed by studying its tangible heritage. However, in 1982, UNESCO introduced a new mandate for consideration of intangible heritage to emphasise its significance and to strive for protection of traditional culture and folklore. Several regional assessments have since been made on the impacts and recommendations on the protection of traditions, culture and folklore. When protecting a tangible heritage site, the practice is mainly based on pragmatic conservation and restoration.
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