Cue sports playing nine-ball. Snooker balls are smaller than American-style pool balls with a diameter of 52.5 mm ( in), and come in sets of 22 (15 reds, 6 "", and a cue ball). English billiard balls are the same size as snooker balls and come in sets of three balls (two cue balls and a red, an object ball). Other games, such as bumper pool, have custom ball sets. Billiard balls have been made from many different materials since the start of the game, including clay, bakelite, celluloid, crystallite, ivory, plastic, steel and wood. The dominant material from 1627 until the
Jimmy White's 'Whirlwind' Snooker table which existed at the time, and it could be used by a player to refine real-life snooker skills. The game took MacLean several years to complete; the billiard ball physics alone taking several months of programming. One of the reasons why the game runs as quickly as it does is the way in which each is played. The next shot is effectively pre-played while the is being – the position and movement of each ball being calculated frame-by-frame and kept in a list in memory. Each frame of the next shot is then displayed by rendering each ball from