A Simultaneous Multiuser Collaborative Immersive Design Environment: Extended Reality and Digital Photogrammetry for the Valorisation of Heritage Sites

The paper presents an experimental immersive design environment that integrates digital photogrammetry, 3D modeling, and extended reality technologies for collaborative architectural design in heritage contexts. A photogrammetric survey is used to generate a lightweight textured mesh of a traditional building, which is then imported into a virtual reality design platform (SketchUp with VR plugin). The system enables simultaneous multiuser interaction, allowing designers to collaboratively edit and develop projects within a shared immersive environment. The approach demonstrates how digital twins and XR interfaces can enhance design workflows, improve contextual awareness, and support heritage valorisation, while also highlighting limitations related to scale and usability in architectural applications.