IMMERSIVE VIRTUAL REALITY TO VISUALISE THE VISIBLE AND INFRARED LAYER OF A MEDIEVAL ALTARPIECE

This article describes the conception, development and implementation process of an interactive, immersive virtual reality experience for a museum environment, which allows viewers to virtually explore the 'Retablo de San Jorge del Centenar de la Ploma' in detail and in its entirety. This altarpiece is a pivotal work in the International Valencian Gothic style. It is also an example of Relocated Heritage, which has belonged to the Victoria & Albert Museum in London since 1864. Currently, it is exhibited there in the room housing the Raphael Cartoons. The fact that it is impossible to physically view this work in the Museo de Bellas Artes de Valencia along with other medieval Valencian Gothic altarpieces has motivated the creation of this virtual reality experience. This will enable researchers and visitors interested in this period to virtually examine the work. To produce this experience, different data-gathering technology has been used, such as visible and infrared radiation, photogrammetry and computer design programs like Blender and Unreal Engine. For the viewing, high-range computer equipment and virtual reality headsets have been implemented, which totally immerse the user in the created environment. In this experience, the viewer is taken on an aerial tour of virtually reconstructed 15th century Valencia and finally brought to the altarpiece, where a close examination can be made. This examination implements both the visible light spectrum and that of infrared radiation, enabling the contemplation of the iconography of each of its scenes and characters and the detailed study of the techniques used in the creative process of this emblematic altarpiece.