Validation processes of H-BIM models: a case study

BIM is becoming one of the main methodology in the field of the cultural heritage, to create digital models, aiming to take place of the real historic buildings for investigation, analysis and simulations. However it is still an open problem the validation of H-BIM models, to ensure reliability of the archived information. In fact there are two main aspects to achieving an H-BIM model: the first relates to the process of converting, geometric data captured from survey into parametric elements and their semantic modelling; the second one relates to the definition of BIM use that will heavily influence the same modelling stage. The paper deals with a methodology of survey data modelling and model validation, highlighting the need to create a database, containing geometric data and information, in order to ensure reliability and usability over time. It is presented the case study of "Morgana Fairy" fount, built by Bernardo Vecchietti in 1573 and adorned with Gianbologna's sculptures at Bagno a Ripoli in Florence. The model has been validated by a geometric comparing analysis of the deviation between the model itself and the mesh obtained with the acquired point cloud data.