Managing 4D Modelling Supported by Modern Archaeology for the In-Depth Study of a Ruined Castle – Oedenbourg Castle in Alsace, France

Abstract. The modelling work described in this paper begins with a review of the methodologies employed for data acquisition and modelling of the current state of the Oedenbourg Castle, Alsace, France. Preliminary topographical work was carried out to accurately georeference the site. An uav flight was organized to acquire aerial images. Photogrammetric processing supplemented by TLS measurements and uav images produce dense point clouds and meshed and textured models. Before the resumption of excavations in 2023, an initial sequence of 3D models has been produced, based on the most probable hypotheses to date. It included the following phases: 9th-10th century, beginning of the 13th century, late 13th century. New excavations have enabled the archaeologist to complete or even propose new hypotheses with a different phasing, possibly calling into question certain previous models: 13th century, before ¾ of the 13th century, last ¼ of 13th century, 14th, early 15th century. The paper will cover the detailed management, organization, and recovery of the various models in Blender, in particular with linked scenes to track their evolution over time as new knowledge is acquired and new hypotheses formulated. Among the fundamental steps involved in sustainable, scalable modelling, it is important to emphasize the following: positioning tools, elevation design, modelling/integration/placement of openings, scene render optimisation using Modifier, UV mapping and finally highlighting the evolution of modelling based on archaeological excavations with renderings of new 4D models and highlighting scientific knowledge.