High resolution photorealistic 3D models are created with the intention of "fooling" the average film or television viewer. If you're unaware that the live actor you think you are seeing is in fact a "digital double," that's a VFX job well-done. Creating these characters (objects, sets or environments) via 3D scanning also involves a photo shoot in which a uniquely qualified photographer will shoot high resolution photos to be used for reference.
Very interesting post on 3D models, you will be amazed.
