## 8 Conclusions  
The novelty of our research lies mainly in its analysis of suitable current methods of 3D documentation and in the development of a methodology for 3D model rendering in VR/AR. This seems straightforward, but many technical problems are commonly encountered in the procedure, which are defined and solved here. A significant benefit, then, is the ability to accurately calculate changes in volumes during the reconstruction work compared to the conventional construction logs used. Within the framework of an international project for the reconstruction of important cultural heritage, suitable documentation technologies were tested and the data obtained were analyzed in terms of accuracy and usability compared to classical procedures for the restoration of objects. The main results can be summarized as follows:  
1. It can be concluded that in terms of cultural heritage documentation, low-cost photogrammetry and TLS can be used together; their combination with the advantages of each technology is provided by modern processing software, such as RealityCapture or Agisoft Metashape from version 2 onwards. However, it is necessary to follow the rapid development of software; what is being investigated today is already common in a few years. 2. Smaller and especially easily portable TLSs can be advantageously used in heritage conservation; their accuracy is sufficient for heritage conservation and is around 5 mm in determining the spatial position of a detailed point. TLS also adds scale and undeformed object shape to photogrammetry and allows for the generation of control points from point clouds for photogrammetric purposes. 3. Repeated measurements during the restoration process make it possible to accurately determine material cubatures and changes to the object, which is very important from a financial point of view; quite significant differences have been found between accurate measurements and working protocols, which is crucial for practice. The differences were to the detriment of the constructor and amounted to over 13% for excavation but only up to 5% for new material. 4. The VR/AR visualization methods are state-of-the-art, but the models must be pre-adjusted for hardware reasons. The decimation of triangles and subsequent special texture to simulate the spatial impression (AO) is used to avoid loss of the model's predictive power. In the case of the shrine project, the total model had over 100 million triangles. After cleaning and cropping the model, 63 million triangles remained, which were programmatically decimated to 17 million triangles. This amount is already processable in UE version 5, but was not possible in lower versions. Here, an optimized technology for converting the 3D model from photogrammetric measurements to a VR/AR environment was developed and debugged. The result is a flow-chart for both the old and new versions of UE. (5) Both computing technology and software are improving significantly; 3-5 years is the classic time when the technological procedures and existing rules for data processing visualization usually apply. However, it is still not possible to upload a full resolution model to VR/AR, which is provided by photogrammetry in conjunction with TLS. (6) VR/AR can also be used remotely for remote locations without the need for a personal visit by an expert (building statics, sounding work, reconstruction steps, etc.). (7) Goals for a VR app with wider model display capabilities have been met, as well as the creation of decimated 3D models for augmented reality display with minor limitations for iOS devices. The developed app and the processed detailed 3D models have significantly helped in the reconstruction of the sanctuary, and it is therefore undeniable that the new visualization technologies represent a significant advance in working with 3D objects. Conceptualization, K.P.J. and K.P. ; Methodology, K.P.J. and K.P. ; Software, K.P.J. ; Validation, K.P.J. ; Formal analysis, K.P.J. ; Investigation, K.P.J. ; Resources, K.P.J. ; Data curation, K.P.J. and L.B.