3D computer animation

Computer animation is the process used for digitally generating moving images. The more general term computer-generated imagery (CGI) encompasses both still images and moving images, while computer animation only refers to moving images. Modern computer animation usually uses 3D computer graphics. Computer animation is a digital successor to stop motion and traditional animation. Instead of a physical model or illustration, a digital equivalent is manipulated frame-by-frame. Also, computer-generated animations allow a single graphic artist to produce such content without using actors, expensive set pieces, or props. To create the illusion of movement, an image is displayed on the computer monitor and repeatedly replaced by a new similar image but advanced slightly in time (usually at a rate of 24, 25, or 30 frames per second). This technique is identical to how the illusion of movement is achieved with television and motion pictures. To trick the visual system into seeing a smoothly moving object, the pictures should be drawn at around 12 frames per second (which, when animating on 24 frames per second, is called "animating on twos”) or faster (a frame is one complete image). At