Abstract
In a context of web application in the field of the dissemination of cultural heritage, this article advances in a methodology for the optimization of points clouds obtained through the technology of Laser Scanner (TLS). Identifying the potential of TLS surveys as interactive models that allow the cultural heritage to be perpetuated over time. This point cloud optimization is developed with free software, focusing its exploitation on an interactive web application, which has made it possible to convert two temporary museum exhibitions into permanent exhibitions in virtual format. Developed in conjunction with the Museu d’Història de la Ciutat de Barcelona. The case study focuses on the Palau Reial Major, Gothic style, formed by the chapel of Santa Àgata (built in 1302, on the Roman wall) and Saló del Tinell (built between 1359 and 1370, on the Roman remains). Located in the Plaça del Rei, in the old town of Barcelona. In this application is very important the visual impact, it requires to represent a faithful model of the interior of the building, from the point of view of color and lighting, avoiding the transparencies of the model through a dense cloud of dots, without occlusions, this requires a great quantity of positions. This implies a clear methodology, using different techniques such as photographic proyection, given the complexity of lighting of the building, as much for the artificial lighting as for the lighting of the stained glass. In this process, there were 84 positions that provide greater density of points, which are optimized with free programs. The temporary exhibitions of the case studies, elaborated by the MUHBA in the Saló del Tinell are: “Indianas, 1736-1847. The origins of industrial Barcelona” exposed from May 19, 2012 to March 3, 2013 and “El Món del 1714” exposed from December 20 to September 28, 2014. Both are based on a tour with showcases and exhibitors where different objects of a museum character are shown, such as looms, cloths, dresses, books, among others, accompanied by panels with texts and images that contain the information that each exhibition shows. Virtual applications allow such temporary exposures to become an interactive model, in which information can be permanently consulted. A virtual tour where the user can interact with the information panels and observe in detail the different objects of the exhibition. The results of this work manage to generate a powerful mechanism of diffusion and approximation to the society of the cultural heritage that, otherwise, as a whole as exhibition would disappear.
Highlights
The virtualization of museums has been a constant in recent years
Depending on the technology used for data collection (Terrestrial laser scanner technology of Laser Scanner (TLS), photogrammetry, classical topography, panoramas ...), one technology or another is used for the development of the virtual application
Together with the Museu d’Història de la Ciutat de Barcelona (MUHBA), we propose the virtualization using the most appropriate methodology for the representation of each element, without depending on the technology used to collect the data
Summary
The virtualization of museums has been a constant in recent years. It seeks to bring knowledge to the general public, and to the scientific community, in order to create a continuous debate. Starting from the laser scanning of two temporary exhibitions and the building Palau Reial Major where they took place, a methodology is established for the optimization of the point cloud models as basic documentation for the development of a web application that allows visiting such exhibitions. The techniques that are taken into account when generating the complete model are three: Images as textures (including panoramas), modelling from meshes, and optimized point clouds. 5.2.1 Outside To perform the exterior of the buildings (the urban context of the application), it has been considered to generate 3D drawings to which images are added as texture as a context (Figure 6), taking into account that the exterior does not conform the direct interactive part application This option is more advantageous than meshing the exterior with detail, because complexity would recharge the processing of the application, directly affecting its performance.
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