Unreal Engine
Unreal Engine (Unreal for short) is a game engine developed by Epic Games, first showcased in the 1998 first-person shooter Unreal. Initially developed with first-person shooters in mind, it later saw use in other game genres, has seen adoption by other industries most notably the film and television industry and was ported to many different platforms, supporting a wide range of desktop, mobile, console and virtual reality platforms.
The Definitive Edition remasters of GTA III, GTA VC and GTA SA use Unreal Engine 4, replacing RenderWare which served as the rendering engine for the original trilogy releases. This thus necessitated converting any existing model mods to the new engine. However, some of the original games' internals such as the SCM scripting engine are carried over to the remasters; while this allowed them to preserve the original game mechanics, complexities with reconciling both old and new code resulted in long-standing issues present in the remasters.
