Vice City used static light maps. San Andreas introduced a day/night cycle with colored shadows and volumetric headlights (for the PC version especially). This required a shader pipeline hack that RenderWare 3.x was never supposed to have.
The engine for Vice City and San Andreas is actually a heavily modified version of the RenderWare-based engine first built for Grand Theft Auto III (2001). That's why all three games share a common "feel" in driving, physics, and file structure. gta vice city san andreas engine
The character movement in San Andreas , for instance, feels snappier. The driving physics, while less realistic than modern counterparts, were predictable and fun. The engine used a simplified collision model that allowed for high-speed chases without the car crumpling into an unrecognizable heap after a single crash. This gameplay loop—fast, responsive, and slightly floaty—became a signature of the PS2 era, distinguishing it from the heavier, more simulation Vice City used static light maps
The visual diversity of San Andreas relied heavily on the engine’s ability to render distinct biomes. The RenderWare build for San Andreas introduced a dynamic skybox and weather system that could handle the smog of Los Santos, the fog of the forests, and the sandstorms of the desert. The particle effects system was also upgraded to handle more complex explosions, smoke trails from planes, and the spray of water from passing boats. The engine for Vice City and San Andreas
The "GTA Vice City San Andreas engine" evolution is most visible in three key areas: