SFX Thursday 3rd February 2022 LO; to create a realistic green screened clip using imovie Special effects are illusions or visual tricks used in the theatre, film, television, video game, and simulator industries to simulate the imagined events in a story or virtual world. Special effects are traditionally divided into the categories of mechanical effects and optical effects. Pyrotechnics, prosthetic makeup, animatronics, and live-action weather elements are just a few examples of special effects . CGI stands for computer generated imagery, which is the use of computer graphics in art and media. These can be 2D or 3D animations, objects, or renderings.