Intro sequence

An intro sequence is a non-interactive introductory sequence for a computer or video game. Previously, intro sequences were very often prerendered, hand drawn, or otherwise outside the main game engine. In recent years, sophisticated game engines have been able to render graphics of comparable quality to ray-traced sequences, allowing modern intro sequences to take place within the game engine (Unreal Tournament), or even as a scripted subsection of the game (Half Life).