## 2 Background Study  
In the last two decades, the acquisition of three-dimensional data by laser scanning [6], using structured light [7] or SfM [2,8] has become one of the standard methods of documenting cultural heritage. It makes it possible to analyse the shape, geometry historic artefacts in a safe way [9]. They do not damage the surface or structure of the exhibits, because the activities carried out using the abovementioned methods do not require direct contact with the analyzed object. They allow for the accurate development of digital documentation of the measured object and then, for example, for creating a copy using the 3D printing technique [10]. The interest in scanning techniques is constantly growing and is being developed [11], because digitisation of museum collections allows to preserve exhibits for many decades and to pass on modern scientific achievements to the next generations. Creative involvement in digital 3D models of heritage artefacts can stimulate learning and support new forms of activity using digital models of historic artifacts [12], e.g., it allows disseminating 3D models on the Internet or creating virtual museums. Highly accurate documentation and 3D reconstructions are of fundamental importance for analysis and further interpretations in archeology. In recent years, integrated digital research (ground-based research methods and UAV photogrammetry) has proven its major role in documenting and understanding excavation contexts. This has become possible thanks to the development of specialised devices and the development of appropriate methods for collecting a wide variety of data on site. Several historic sites in the Sepino area of Italy were investigated with these methods and were realised using both range-based and image-based data acquisition methods. The laser scanning data were combined with SfM clouds in the same frame of reference, determined by topographic and GPS measurements [13]. By means of photogrammetry, the area of the Great Plains was examined under field conditions [14], as well as areas of Jordan [15]. The study of the effects of deformation in thermally forced rock masses has aroused growing interest in engineering geologists in the last decade. In this context, digital photogrammetry and infrared thermography and laser scanning have become the two most frequently used analysis techniques in engineering geology applications as they can provide useful information on the geomechanical and thermal conditions of these complex natural systems [16,17]. Photogrammetry and 3D scanning were used in the Pinchango Alto research in Peru [18]. 3D scanning methods were also discussed in the [19] work on the virtual archaeological exhibition. In the study of a unique early Christian carved stone discovered in Scotland, 2D photos were used as the basis for the reconstruction of the 3D model using the SfM method [20]. A FARO Photon Laser Scanner 120/20 system was used to record the geometric data of a complex of historic buildings in Malacca (Malaysia), declared a UNESCO World Heritage Site in 2008 [21]. Scanning with the use of 3D technology was also used to create ethnographic collections [22]. Having digital 3D models allows one to perform a virtual reconstruction of incomplete or damaged artefacts by restoring their original shapes or decorations along with the functions they performed. An example is the reconstruction of a Roman cornice from the Castulo archaeological site (located in Spain) presented in [23]. Virtual 3D models were created on the basis of a series of photos in the paid Agisoft Metashape program, and digital reconstruction using the free Blender software. The reconstructed models were then used to recreate the cavities by 3D printing. Thanks to digital reconstruction, exhibitions in virtual museums gain a new format. Examples of virtual museums created with the use of 3D models obtained in the process of digitisation of objects are the Archaeological Museum in Zagreb [24] and the National Archaeological Museum in Florence [25].