3D computer graphics, sometimes called CGI, 3DCG or three-dimensional computer graphics (in contrast to 2D computer graphics), are graphics that use a three-dimensional representation of geometric data (often Cartesian) that is stored in the computer for the purposes of performing calculations and rendering 2D images. The resulting images may be stored for viewing later (possibly as an animation) or displayed in real time. Unlike 3D film and similar techniques, the result is two-dimensional, without the illusion of being solid.