A three-dimensional scanner is a scanning and 3D acquisition 3D scanner A three-dimensional scanner is a device that analyzes the objects or their immediate environment to gather specific information on the form and possibly on the appearance (color, texture) of these. The data collected can then be used to build CGI three-dimensional (digital objects) for various purposes. These devices are much used by the industries of entertainment for movies or video games. Digital images of scanned objects in 3D are also used for industrial design, the design of prostheses, reverse engineering, for quality (digital repository) control or for the documentation of cultural objects. Sans-contacts scanners may be subdivided into two main categories, active and passive scanners. They are themselves into many subcategories based on their technological principle.