## 8 Conclusions  
At present, it has never been easier to document cultural heritage sites using VR technologies. It is now possible to obtain reliable records of cultural heritage by combining the new technologies, equipment and computer programs with tried and tested methodologies from the fields of cultural heritage conservation that have been used for several decades. The results of this documentation process can be used for different purposes: research, tourism, exhibitions, and so on. However, documenting the current and past states of cultural heritage for conservation purposes is arguably the most important goal of the documentation process. This paper presents a work process for recovering cultural heritage using classical and novel tools. The reliable results provided by these tools are then used to create a faithful reconstruction of a historical element. In this study, a model for documenting dilapidated cultural heritage sites using VR technologies is presented. The intervention was applied in the St. Augustine church in the city of San Cristobal de La Laguna, which is located in Tenerife, the Canary Islands. The objective was to reconstruct a historical building using 3D modelling techniques and use VR technologies to visualize and interact with this said model. The 3D model was created using traditional processes, starting with a precise topographical survey, onsite visual inspection, and a review of historical photographic archives, especially for the roof that no longer exists. Using the surveys and processes that were completed and then optimised utilising digital image analysis tools, researchers were able to create a reasoned and logical argument as to the nature of the murals of St Augustine church. Figure 16: Virtual interactive actions developed for the program: (**a**) teleportation, which allows the user to move around the scene, and (**b–d**), selection by pressing the virtual button, which allows the user to view specific information on the church. DGtretch(r) proved to be an incredibly versatile analytical tool, despite the fact that the processes being performed in this study fall outside its original field of application. The tool allowed researchers to digitally visualise invisible elements with detail. This not only made it possible for researchers to recover details hidden to the naked eye, but also improved the objectivity of the formal analysis that was performed, and thus of the digital reconstruction work that was undertaken. One of the main advantages of this plugin is that users need not possess a wealth of prior knowledge of digital image processing to be able to use it. Its design and default settings help users learn quickly and easily, and it provides users with immediate feedback. Unlike other image processing software, the digital enhancements made possible by this piece of software are dependent on the operator, i.e., the results tend to vary greatly depending upon the skills and experience of the operator. In light of the results garnered, the authors of this paper argue that DStretch(r) is an invaluable tool for the formal analysis of historical frescos and murals, and thus, a useful tool for conservator-restorers and for cultural heritage education. Having inserted a custom-built 3D model into Unity, an immersive virtual reality visit was developed for the VR system Acer Windows Mixed Reality. This VR system provides a truly immersive experience that allows users to step inside the virtual church environment without ever having seen the church itself in real life. The universal appeal of VR apps, and the importance of leaving reliable records of our cultural heritage, make remote historic monuments or ruins the ideal settings for immersive VR applications. In terms of knowledge dissemination, the inclusion of additional information such as text, photos, multimedia products and user interactions widens the realm of possibilities.