Complex 3D Heritage Architectures Accessible on the Web

3D digitization, based on active or passive sensors, is a need for all man-made or natural heritage structures. It is indeed important to digitally preserve our past using the latest ICT solutions to protect and valorize it. This paper presents a collaborative work for the 3D surveying of a complex heritage monument, its annotation and segmentation for semantic reasons and the final access on the web for dissemination and valorization purposes. We report a scalable methodology for 3D surveying and exploration of large 3D results. The case study is a large castle decorated with frescoes and ornamental elements which was surveyed using photogrammetry. The 3D results (dense coloured point clouds) are enriched with metadata and historical information and shared on the Internet using a customized point-based viewer.