Virtual camera system

In 3D video games, a virtual camera system aims at controlling a camera or a set of cameras to display a view of a 3D virtual world. Camera systems are used in videogames where their purpose is to show the action at the best possible angle; more generally, they are used in 3D virtual worlds when a third person view is required.

As opposed to film makers, virtual camera system creators have to deal with a world that is interactive and unpredictable. It is not possible to know where the player's character is going to be in the next few seconds; therefore, it is not possible to plan the shots as a film maker would do. To solve this issue, the system relies on certain rules or artificial intelligence to select the most appropriate shots.

There are mainly three types of camera systems. In fixed camera systems, the camera does not move at all and the system displays the player's character in a succession of still shots. Tracking cameras, on the other hand, follow the character's movements. Finally, interactive camera systems are partially automated and allow the player to directly change the view. To implement camera systems, video game developers use techniques such as constraint solvers, artificial intelligence scripts, or autonomous agents.

In video games, "third-person" refers to a graphical perspective rendered from a fixed distance behind and slightly above the player character. This viewpoint allows players to see a more strongly characterized avatar, and is most common in action games and action adventure games. Games with this perspective often make use of positional audio, where the volume of ambient sounds varies depending on the position of the avatar.

There are primarily three types of third-person camera systems: the "fixed camera systems" in which the camera positions are set during the game creation; the "tracking camera systems" in which the camera simply follows the player's character; and the "interactive camera systems" that are under the player's control.

...
Wikipedia