## 5 Discussion  
This research work aims to reconstruct the original shape of a fragmented artefact by enabling a faithful 3D model to be used as the support of the embossed disk modeled within CATIA, a computer-aided software specializing in surface design and reverse engineering. The resulting 3D model has then been transferred to Mudbox to enable the use of the defined ormanns as stencils, which enable the deformation of the 3D modeled support vertices to follow the trueness and accuracy of the 3D scanned ormanns. The ormanns could have been positioned within CAD as overlapping meshes, but we wanted to ensure that the 3D model has no self-intersection and other 3D modeling related problems that would later raise problems in computer-aided manufacturing processes. Existing 3D reconstruction frameworks published in related articles make use of 2D and 3D references to define accurate 3D reconstruction. Our proposed 3D reconstruction framework proposes the creation of an ornament stencil database that eliminates problems regarding the 3D model topology and other associated 3D modeling problems. The shortcoming of the proposed framework is that the use of detailed vector displacement maps requires a high amount of processing power; therefore, the use of a performance laptop or workstation with at least 32 GB of RAM is recommended. As presented within the paper, the framework can be followed using open-source software such as Blender to replace Mudbox, or FreeCAD to replace CATIA, but there will be some interoperability problems associated with the file format, which will have to be resolved. The accuracy of the proposed 3D reconstruction is closely linked to the specification of the 3D scanner that has been used to acquire the 3D dataset. The fragments of the disk currently exhibited at the National Museum of Transylvanian History from Cluj-Napoca and the two repatriated embossed disks exhibited at the National Museum of Romanian History from Bucharest have been 3D scanned using the Creaform GoScan 50 structured light scanner. The authors made use of this scanning solution as it provides trueness and precision compared to the other 3D scanning equipment currently available within the 3D scan laboratory from the Technical University of Cluj-Napoca. There are other scanning solutions commercially available on the market that can acquire more accurate 3D datasets, but those solution are either too expensive, not portable, or not accessible to us. Figure 29: The developed mixed reality application for Hololens 2, intended to disseminate the 3D reconstructions of the Dacian embossed disks. The vector displacement maps generated based on the available 3D dataset obtained integrate fine details from the surface of the ornaments. As an example, the features of the aurochs' ornament have intricate details (the tuft of fur under the snout, the high withers, and the mane). Even the small parallel incisions used to render the fur have been acquired by the scanner and stored within the resulting vector displacement map after the proposed ornament extraction framework. As for the case study, we have selected an artefact that was physically restored incorrectly by curators soon after it was discovered. The incorrect restoration integrates ornaments from two different Dacian embossed disks. Only with the recent repatriated Dacian embossed disks was it clear that the fragments are from two different disks; therefore, the 3D digital reconstruction process described within this paper has been conducted. Only the aurochs' embossed disk has been 3D reconstructed, as the other fragments with the griffin leg and the circular patterned leaves are too fragmented to enable an accurate 3D reconstruction. These ornaments have various similarities to the griffin repatriated disk (Figure 12), but the leg position from the central register is different; therefore, the 3D reconstruction proposal would be subjective.