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The Bryn Cellu Ddu AR app allows users to immersive themselves in the history of one of the most important prehistoric sites in Britain. Bryn Cellu Ddu is located on Angelsey, an island on the North West coast of Wales, UK. The app covers four stages of the site's development: the earliest recorded human activity - a row of five postholes radiocarbon dated to the Mesolithic period (6th millennium BCE); a 31st century BCE henge and stone circle; 31st-30th century BCE passage tomb and earth mound; and the modern (1920s) reconstruction of a smaller earth mound and henge. The app operates in two main modes, an onsite mode allowing visitors to the site to understand the history of the site in context, and offsite, allowing “desktop” visualisation of the site and its history at a scale appropriate for indoor viewing. In onsite mode, the models are rendered at full scale in registration with the current site. The "onsite" mode will also work offsite, but with a default position and orientation. The AR 3D models have been developed by digital artists working with input from leading archeology experts studying the site. The current site was captured using photogrammetry on images captured from an unmanned aerial vehicle. In addition to the 3D models, the app contains 3D scans of artefacts found on or related to the site, information about the site and artefacts, and a specially commissioned soundscape composed for the project.
