# Enhanced and Combined Representations in Extended Reality through Creative Industries
## 1 Introduction  
The digital transformation in every aspect of everyday life is taking place at a rapid pace [1, 2, 3, 4, 5, 6, 7, 8]. On the one hand, the rapid technological developments in digitization are leading in this direction. On the other hand, the special conditions that arise in socio-economic life accelerate the whole process [4]. The sector of culture is a typical example that was significantly affected by the recent pandemic [9, 10]. At the same time, it is also a sector that has benefited significantly from the digital transition [11, 12, 13, 14]. The traditional ways of digitizing cultural heritage and the testing of innovative methodologies contribute to the documentation, conservation, maintenance, restoration, and better communication of cultural assets [15]. This may concern ancient artifacts, works of contemporary art, archival collections, buildings, archaeological sites, and more [16, 17]. Thus, repositories and infrastructures host various collections of digital cultural heritage assets accompanied by their metadata and paradata [18]. Specific types of data can provide specialized information for a range of disciplines. Tomographs provide the ability to study invisible areas that are inside three-dimensionalgeometries [19]. The use of computed tomography scans (CT scans) in medicine enables the doctor to draw safe conclusions or estimates about a patient's condition, such as the early diagnosis of a cancerous tumor or the healing process of a broken bone [20]. In cultural heritage, the use of CT scans can help to document the findings holistically without applying deductive methods to investigate their internal structure [21]. It has characteristic fields of application in Egyptology and papyrology [22; 23]. In specific cases, analysis of the scans revealed information that shed light and revised our knowledge [24; 25] of ancient technology [26; 27; 28; 29; 30; 31]. Increased computing resources and specialized software and hardware packages are required to analyze and study the tomographs. One of the most important things is the interdisciplinary collaboration between the research groups and the stakeholders when working with CT scans. In recent years, the development of immersive technologies has been remarkable [32; 33]. Their adoption, across a wide spectrum of socio-economic life, is expected to increase steadily, especially as we enter the age of virtual worlds and traverses [34; 35; 36; 37; 38; 39]. Extended reality (XR) is characterized by augmented reality (AR), virtual reality (VR), and mixed reality (MR). Extended reality offers the possibility to develop innovative products and useful applications that were unimaginable just a few years ago [14; 40]. The fact that extended reality applications can be developed on popular game engines also contributed to their widespread use [41]. The characteristic of game engines is that they can incorporate heterogeneous immersive technologies but, at the same time, benefit from emerging technologies such as the broad field of artificial intelligence or haptic technologies [42; 43]. The key component of extended reality applications is their content. Primarily, it concerns 3D geometries that are overlaid with material, with a photorealistic texture, and placed in virtual space to simulate an environment. The creation of extended reality content is based on automated digitization methods, semi-automated processes, manual methodologies, or their combination [15; 44; 45; 46; 47; 48; 49]. Often, the assistance of artificial intelligence (AI) is used to speed up the process or to optimize the result [50]. However, a critical factor for the smooth execution of extended reality applications is the degree of complexity of the geometry of the objects and, specifically, the number of polygons of which they are composed [51; 52; 53; 54]. In several cases, additional optimizations are required to simplify the geometry, targeting two factors.