First game engine to feature spline-based curved surfaces
id Tech 3

The first game engine to allow spline-based curved surfaces in a game was the id Tech 3, the engine behind Quake III Arena. This technology renders and slots together a series of small geometric shapes in order to create the impression of a smooth surface, so gone are the flat, 2D sprites of its predecessors. Other features of the engine include improved animation (thanks to the use of vertex movements), a high-level shader language, and a method for rendering volumetric fog.