“…This is particularly true when dealing with simplified 3D models (Algabary et al, 2014;Vani et al, 2012), such as virtual bas-relief representations (also named 2.5D models). A digital bas-relief delivers a volumetric projection of shapes into the viewer's space, so that it is detached from the two-dimensional background (Kerber et al, 2010); as a result, a nearly flat surface maintaining as much as possible the perception of the full 3D scene can be generated (Weyrich et al, 2007).…”