The tremendous improvements in data capturing technologies and in the related processing methodologies are opening more and more possibilities in different fields of applications. In particular the Cultural Heritage field is taking great advantages from the latest reality-based 3D modelling developments. One of the most significant consequences of the introduction of digital 3D modelling in the heritage field is the great opportunity of using 3D models as highly effective and intuitive means of communication or as interfaces to share and visualize information collected e.g. in databases. Unstructured 3D data recorded with photogrammetry or laser scanning techniques are generally converted in polygonal textured 3D models, subdivided and organized using automated and manual methods and finally visualized using web-based tools in order to allow remote access and data retrieval to a wider range of users, with evident advantages in enlarging knowledge and education. The paper presents the state-of-the-art in 3D surveying and modelling, segmentation and web-based access for heritage sites and objects (Fig. 1). The most reliable and practical approaches are presented with references and best practices. Some future perspectives are also addressed.
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