A way to overcome the concave/convex ambiguity of shape-from-shading (SfS) is to use several images of an object taken from different viewpoints, instead of a single one. A computer vision pipeline combining the structure-from-motion and the multi-view stereo techniques can be used to get an initial 3D-shape of the object surface, which is then refined using SfS. This is a part of Jean Melou's PhD thesis, which is co-supervised with Yvain Queau (TUM, Munich, Germany).