Unreal Engine was born in 1995 thanks to the intuition of Tim Sweeney, founder of Epic Games. While working in his parents’ garage, Sweeney started writing the code for a first-person shooter game in C++, with the visionary goal of creating a system that would make modifying and creating levels easy and immediate. Sweeney’s revolutionary idea was not limited to developing a single shooter game (titled Unreal), but focused on building a modular graphics engine. When the engine and the video game of the same name debuted in 1998, the software included the Unreal Editor. For the first time, this tool allowed developers to move objects, modify lights, and change textures seeing the result in real-time, within the same screen.
Offered real-time 3D rendering, colored lighting, fog effects, and transitions between interiors and exteriors. It laid the foundations for modern competitive shooters, introducing optimized network code and the first tools for mods.
Called Warfare Engine, it introduced support for skeletal meshes, dynamic shadows, and advanced artificial intelligence. It brought the engine beyond gaming, being used for simulators and government-sponsored projects.
It dominated the seventh generation of consoles (PS3, Xbox 360). It introduced Kismet (a rudimentary visual scripting system) and the PhysX physics engine by Nvidia. Real-time rendering based on DirectX 11 hardware, support for vast open-world environments, and high-level graphics even on mobile devices (via Epic Citadel).
It replaced the old code with the Blueprint visual node system, eliminating the need to write C++ code for basic functions. It introduced PBR (Physically Based Rendering) for realistic materials. During UE4’s lifecycle, Epic integrated real-time Ray Tracing (introduced in 2018 with the Reflections demo) and the Chaos physics destruction system, which later replaced PhysX.
Unreal Engine 5 revolutionizes real-time rendering through two proprietary technologies, which eliminate limitations on polygon counts and light calculation. Virtualized geometry system. It allows importing cinematic assets (with billions of polygons) directly into the game without performance loss, and much more.