Date Added: Sep 2008
Today virtual worlds are mainly 3D-online-infratructures. The most important goal is the creation and simulation of a so called \"Metaverse\". It describes a world similar to the reality, where people are able to interact with each other represented by avatars. They can also move around or use and combine virtual objects. Lots of things are needed to be simulated in order to fill a Metaverse with virtual life, for example physics or artificial intelligence of non-player-characters. By now there are many 3D virtual environments based on this concept.