The use of 3D digital models has become inevitable for the scientific reconstruction of ancient edifices now lost. The Plate-Forme Technologique 3D of the Institut Ausonius uses a validation process for this type of research. This begins with the creation of an initial electronic model (V1) which alone can make it possible for researchers to speak together with precision over the validity of the reconstructions up to the attainment of model V3, representing the total sum of the hypotheses deemed the most probable. This type of research on antique spaces (with more or less scientific quality) is now widespread and called for the creation of a " Conservatoire National des Restitutions archéologiques 3D " (Archeogrid), an objective set by the PFT3D.