## 2 Background Study
Artefact scans are described in [26], and the obtained models were used to create integrated VR applications. SfM technology is sometimes dedicated to specific devices. The work [27] describes an example of 3D digitisation of a dress using specialised Autodesk 123D Catch software developed for iPhone and iPad devices. The digital 3D model was generated on cloud servers, after which it was possible to perform surface finishing (Adobe Photoshop) and a 3D model (3 ds Max), in which the object was also rendered to transfer it to the Unity engine for presentation purposes. SfM technology is used in extremely different fields, such as forestry [28] or medicine [29; 30]. The SfM method was used to study three contrasting terrain forms at different scales, including: (i) exposed rocky coastal cliffs, (ii) a disturbed complex of moraine dams, and (iii) a bedrock ridge carved in the glacier [31]. Photogrammetric three-dimensional models of objects were made in Colombia, which served as a library of props in landscape visualisation [32]. The mapping technique was used in georeferencing of archaeological aerial photographs [33], and it was also used to study large monuments of the northern river terrace of the Uyuk valley (Russia) and their state of preservation was assessed on the basis of high-resolution optical satellite data [34]. The use of scanning and mapping techniques in the field of geography was used in the study of the water-level fluctuation zone in the Three Gorges Reservoir area in China. An innovative approach to photogrammetry using ships as a device carrier, which was also used for 3D acquisition of landslides, was proposed [35]. Photogrammetry techniques can also contribute to the restoration works of buildings. Study [36] discusses the activities related to the main characteristic elements of the Venetian basilica, which were documented using very high resolution orthophotos. The SfM method was used to integrate the data obtained from the Multi View Stereo and the images generated by a camera placed on an unmanned aerial system (UAS). Tests of generating 3D models based on ground and aerial data acquisition were carried out in the conservation of the Cisterican Staffrada Abbey in Piedmont, a cultural heritage site in Italy. Airborne data acquisition was based on a photogrammetric Remotely Piloted Aircraft System (RPAS) flight, while ground-based research was carried out by laser scanning. Both methods allowed to extract and process various point clouds and generate mesh 3D models of different scales (different resolution, detail content and precision) [37]. In turn, the obtained 3D point cloud was used to study the brick bridge over the Sele River (southern Italy), characterised by unique architecture of historical value, dating from the mid-nineteenth century [38]. Description of available free software for SfM technology and comparative studies of the use of four programs (COLMAP, OpenMVG, Theia and VisualSFM) to create 3D models of several different objects of sizes from 1 to several meters is presented in [2]. In the light of the works discussed, it appears that the application of the SfM method can be found in various fields: cultural heritage, museology, archeology, geography, as well as medicine and even forestry. The cited works also present other technologies of 3D data acquisition of digitised objects. They most often present case studies, and methodological issues are discussed marginally. There is a lack of research that would concern comparative analyses of 3D models obtained by various methods. Only one work was found [39], in which the authors compared the 3D models obtained using four different methods: structured light scanning, triangulation laser scanning, photometric stereo and close-range photogrammetry. This article attempts to answer questions about the efficiency and effectiveness of data acquisition methods and for the creation of 3D models as well as various applications in research and dissemination.