###### Abstract  
Complex demands in the field of cultural heritage preservation often require a multidisciplinary approach and substantial volumes of multimodal data integration and management. The conventional approach to tackling these issues revolves around using different H-BIM (historical building information model) solutions. This paper presents a prototype for a web platform that moves closer to the idea of a digital twin for physical cultural assets. Based on a light development framework, it is designed for online open access and features a versatile custom 3D viewer for intuitive interaction with the presented data. The concept requires a workflow similar to the video-game industry's 3D asset optimization to generate highly detailed 3D models and to facilitate the display of multilayered imaging data. The technological stack features a minimal MVC architecture framework and front-end stylesheets. It is designed to be independent of specific databases, enhancing portability for potential future open-source releases. Moreover, the platform employs WebGL libraries to create a dynamic 3D environment interaction. The capabilities of the web platform were tested in a case study regarding the documentation of an important 17 th-century church in Romania. Further developments and current limitations of the platform are also discussed. web-based 3D visualization; multimodal imaging; H-BIM; data integration; digital twin; WebGL; 3D digitization; photogrammetry; thermal imaging +
Footnote †: journal: Article  
and outdated laws regarding the energy auditing of buildings were fixed, with a focus on historical buildings. An important result of this step is that now, in Romania, the multidisciplinary scientific documentation of monuments, complexes, sites, and historically valuable buildings is no longer optional but has become mandatory. With the increasing maturity of 3D digitization actions towards built heritage, new possibilities have emerged regarding the accessibility of complex and associated data on the state of conservation. Most notable is the H-BIM (historical building information model) workflow and method [13], adapted from the BIM (building information model) workflow used in architecture and civil engineering. The concept of creating a BIM is simply to model a digital 3D representation of a building within which each structural element is a logical entity with properties and attributes, usually managed via a database. Based on this approach, the H-BIM goes further, as it attempts to link the spatial and geometrical shape data of valuable cultural and historical building elements to different types of specialized information regarding the characterization of the state of conservation. In heritage science, buildings are documented through many 'lenses' so that a complete and in-depth portrait can be drawn. As [14] points out, in such an informational model, architectural details and style, material analysis, degradation and intervention mapping, structural modifications, archive drawings, photos, and other related historical documents can all be linked to any of the structural elements defined. This kind of documentation should be carried out periodically and systematically so that prediction models can be generated for a building's entire lifecycle. But, usually, it is performed once and only when intervention is mandatory, and it stands as the conservation state of a given building or artwork at an instant of time. Finally, the end-users can explore the virtual model of the building and access or retrieve any pieces of the associated information for each element. There is a great focus in the scientific community on BIM and H-BIM approaches, which can be seen if we look not only at the number of papers published in recent years [15] but also at the topics of international conferences linked to heritage science. In most cases, similar methods and even software programs are used, with the differences usually being the type of investigation or specific case studies included.