1. A computer-implemented method for determining stereoscopic quality of a computer-generated object in a three-dimensional computer-generated scene, the computer-generated object being visible from at least one camera of a pair of cameras used for creating a stereoscopic view of the computer-generated scene, the method comprising: obtaining a set of surface vertices of the computer-generated object; computing a stereoscopic transformation on the set of surface vertices to obtain a set of transformed vertices, the set of transformed vertices being representative of a stereoscopic shape distortion of the computer-generated object; computing a translation vector between the set of surface vertices and the set of transformed vertices; computing a scale factor between the set of surface vertices and the set of transformed vertices; applying the translation vector and the scale factor to the set of transformed vertices to obtain a ghosted set of vertices, the ghosted set of vertices being approximately translational and scale invariant with respect to the set of surface vertices; computing a sum of the differences between the set of surface vertices and the set of ghosted vertices to obtain a first stereo-quality metric; and storing the first stereo-quality metric.