Original author(s) | Tim Sweeney |
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Developer(s) | Epic Games |
Stable release | 5.4 |
Preview release | 5.5 Preview 1 |
Written in | C++ |
Operating system | Windows, Linux, macOS |
License | Source-available commercial software with royalty model for commercial use [1] |
Website | unrealengine |
Unreal Engine (UE) is a 3D computer graphics game engine developed by Epic Games, first showcased in the 1998 first-person shooter video game Unreal . Initially developed for PC first-person shooters, it has since been used in a variety of genres of games and has been adopted by other industries, most notably the film and television industry. Unreal Engine is written in C++ and features a high degree of portability, supporting a wide range of desktop, mobiles, console, and virtual reality platforms.
The latest generation, Unreal Engine 5, was launched in April 2022. Its source code is available on GitHub, and commercial use is granted based on a royalty model, with Epic charging 5% of revenues over US $1 million, which is waived for games published exclusively on the Epic Games Store. Epic has incorporated features in the engine from acquired companies such as Quixel, which is seen as benefiting from Fortnite 's revenue.
In 2014, Unreal Engine was named the world's "most successful videogame engine" by Guinness World Records . [2]
1998 | Unreal Engine 1 |
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2006 | Unreal Engine 3 |
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2014 | Unreal Engine 4 |
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2022 | Unreal Engine 5 |
Unreal Engine 1 was initially developed in 1995 by Epic Games founder Tim Sweeney for Unreal and used software rendering. It supported Windows, Linux, Mac and Unix. Epic later began to license the Engine to other game studios.
Unreal Engine 2 transitioned the engine from software rendering to hardware rendering and brought support for the PlayStation 2, Xbox, and GameCube consoles. The first game using UE2 was released in 2002 and its last update was shipped in 2005.
Unreal Engine 3 was one of the first game engines to support multithreading. It used DirectX 9 as its baseline graphics API, simplifying its rendering code. The first games using UE3 were released at the end of 2006.
Unreal Engine 4 brought support for physically based materials and the "Blueprints" visual scripting system. The first game using UE4 was released in April 2014. It was the first version of Unreal to be free to download with royalty payments on game revenue.
Unreal Engine 5 features Nanite, a virtualized geometry system that allows game developers to use arbitrarily high quality meshes with automatically generated Level of Detail, and Lumen, a dynamic global illumination and reflections system that uses software and hardware ray tracing. It was revealed in May 2020 and officially released in April 2022.
Paradigm | Object-oriented, generic |
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Developer | Tim Sweeney |
First appeared | May 1998 |
Typing discipline | Static, strong, safe |
OS | Cross-platform (multi-platform) |
Filename extensions | .uc .uci .upkg |
Website | docs.unrealengine.com |
Influenced by | |
C++, Java |
UnrealScript (often abbreviated to UScript) was Unreal Engine's native scripting language used for authoring game code and gameplay events before the release of Unreal Engine 4. The language was designed for simple, high-level game programming. [3] UnrealScript was programmed by Tim Sweeney, [4] who also created an earlier game scripting language, ZZT-OOP. [5] Deus Ex lead programmer Chris Norden described it as "super flexible" but noted its low execution speed. [6]
Similar to Java, UnrealScript was object-oriented without multiple inheritance (classes all inherit from a common Object class), and classes were defined in individual files named for the class they define. Unlike Java, UnrealScript did not have object wrappers for primitive types. Interfaces were only supported in Unreal Engine generation 3 and a few Unreal Engine 2 games. UnrealScript supported operator overloading, but not method overloading, except for optional parameters.
At the 2012 Game Developers Conference, Epic announced that UnrealScript was being removed from Unreal Engine 4 in favor of C++. [7] Visual scripting would be supported by the Blueprints Visual Scripting system, a replacement for the earlier Kismet visual scripting system. [8] [9]
One of the key moments in Unreal Engine 4's development was, we had a series of debates about UnrealScript – the scripting language I'd built that we'd carried through three generations. And what we needed to do to make it competitive in the future. And we kept going through bigger and bigger feature lists of what we needed to do to upgrade it, and who could possibly do the work, and it was getting really, really unwieldy. And there was this massive meeting to try and sort it out, and try to cut things and decide what to keep, and plan and...there was this point where I looked at that and said 'you know, everything you're proposing to add to UnrealScript is already in C++. Why don't we just kill UnrealScript and move to pure C++? You know, maximum performance and maximum debuggability. It gives us all these advantages.'
Verse is the new scripting language for Unreal Engine, first implemented in Fortnite . [11] Simon Peyton Jones, known for his contributions to the Haskell programming language, joined Epic Games in December 2021 as Engineering Fellow to work on Verse with his long-time colleague Lennart Augustsson and others. [12] Conceived by Sweeney, [13] it was officially presented at Haskell eXchange in December 2022 as an open source functional-logic language for the metaverse. [14] A research paper, titled The Verse Calculus: a Core Calculus for Functional Logic Programming, was also published. [15]
The language was eventually launched in March 2023 as part of the release of the Unreal Editor for Fortnite (UEFN) at the Game Developers Conference, with plans to be available to all Unreal Engine users by 2025. [11]
With Unreal Engine 4, Epic opened the Unreal Engine Marketplace in September 2014. The Marketplace is a digital storefront that allows content creators and developers to provide art assets, models, sounds, environments, code snippets, and other features that others could purchase, along with tutorials and other guides. Some content is provided for free by Epic, including previously offered Unreal assets and tutorials. [16] Prior to July 2018, Epic took a 30% share of the sales but due to the success of Unreal and Fortnite Battle Royale , Epic retroactively reduced its take to 12%. [17]
Unreal Engine was originally designed to be used as the underlying technology for video games. The engine is used in a number of high-profile game titles with high graphics capabilities, including Hogwarts Legacy , [18] PUBG: Battlegrounds , Final Fantasy VII Remake , Valorant and Yoshi's Crafted World, in addition to games developed by Epic, including Gears of War and Fortnite. [19] [20] [21] Polish game developer CD Projekt is also planning to use the engine after retiring their in-house REDengine; their first game to use Unreal will be a remake of The Witcher . [22] [23] [24] [25]
Unreal Engine has found use in film making to create virtual sets that can track with a camera's motion around actors and objects and be rendered in real time to large LED screens and atmospheric lighting systems. This allows for real-time composition of shots, immediate editing of the virtual sets as needed, and the ability to shoot multiple scenes within a short period by just changing the virtual world behind the actors. The overall appearance was recognized to appear more natural than typical chromakey effects.
External videos | |
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Industrial Light & Magic - The Virtual Production of The Mandalorian |
Among the productions to use these technologies were the live action television series The Mandalorian , Westworld and Fallout , [26] and the animated series Zafari and Super Giant Robot Brothers . Jon Favreau and Lucasfilm's Industrial Light & Magic division worked with Epic in developing their StageCraft technology for The Mandalorian, based on a similar approach Favreau had used in The Lion King . [27] [28] [29] [30] [31] Favreau then shared this technology approach with Jonathan Nolan and Lisa Joy, the producers for Westworld. The show had already looked at the use of virtual sets before and had some technology established, but integrated the use of Unreal Engine as with StageCraft for its third season. [32] [33]
Orca Studios, a Spanish-based company, has been working with Epic to establish multiple studios for virtual filming similar to the StageCraft approach with Unreal Engine providing the virtual sets, particularly during the COVID-19 pandemic, which restricted travel. [34]
In January 2021, Deadline Hollywood announced that Epic was using part of its Epic MegaGrants to back for the first time an animated feature film, Gilgamesh, to be produced fully in Unreal Engine by animation studios Hook Up, DuermeVela and FilmSharks. [35] As part of an extension of its MegaGrants, Epic also funded 45 additional projects since around 2020 for making movies and short films in the Unreal Engine. [36] By October 2022, Epic was working with several different groups at over 300 virtual sets across the world. [37] Unreal Engine was used for motion capture in Lyle, Lyle, Crocodile. [38]
Unreal Engine has also been used by non-creative fields due to its availability and feature sets. It has been used as a basis for a virtual reality tool to explore pharmaceutical drug molecules in collaboration with other researchers, as a virtual environment to explore and design new buildings and automobiles, and used for cable news networks to support real-time graphics. [39]
In March 2012, Epic Games announced a partnership with Virtual Heroes of Applied Research Associates to launch Unreal Government Network, a program that handles Unreal Engine licenses for government agencies. [40] Several projects originated with this support agreement, including an anaesthesiology training software for U.S. Army physicians, a multiplayer crime scene simulation developed by the FBI Academy, and various applications for the Intelligence Advanced Research Projects Activity with the aim to help intelligence analysts recognize and mitigate cognitive biases that might affect their work. [41] [42] Similarly, the DHS Science and Technology Directorate and the U.S. Army's Training and Doctrine Command and Research Laboratory employed the engine to develop a platform to train first responders titled Enhanced Dynamic Geo-Social Environment (EDGE). [43]
The engine has received numerous awards:
The state of the Unreal Engine came up in Epic's 2020 legal action against Apple Inc. claiming anticompetitive behavior in Apple's iOS App Store. Epic had uploaded a version of Fortnite that violated Apple's App Store allowances. Apple, in response, removed the Fortnite app and later threatened to terminate Epic's developer accounts which would have prevented Epic from updating the Unreal Engine for iOS and macOS. [62] The court agreed to grant Epic a permanent injunction against Apple to prevent Apple from taking this step, since the court agreed that would impact numerous third-party developers that rely on the Unreal Engine. [63]
A game engine is a software framework primarily designed for the development of video games and generally includes relevant libraries and support programs such as a level editor. The "engine" terminology is akin to the term "software engine" used more widely in the software industry.
ZZT is a 1991 action-adventure puzzle video game and game creation system developed and published by Potomac Computer Systems for MS-DOS. It was later released as freeware in 1997. It is an early game allowing user-generated content using object-oriented programming. Players control a smiley face to battle various creatures and solve puzzles in different grid-based boards in a chosen world. It has four worlds where players explore different boards and interact with objects such as ammo, bombs, and scrolls to reach the end of the game. It includes an in-game editor, allowing players to develop worlds using the game's scripting language, ZZT-OOP.
Epic Games, Inc. is an American video game and software developer and publisher based in Cary, North Carolina. The company was founded by Tim Sweeney as Potomac Computer Systems in 1991, originally located in his parents' house in Potomac, Maryland. Following its first commercial video game release, ZZT (1991), the company became Epic MegaGames, Inc. in early 1992 and brought on Mark Rein, who has been its vice president since. After moving the headquarters to Cary in 1999, the studio changed its name to Epic Games.
Timothy Dean Sweeney is an American video game programmer and businessman. He is the founder and CEO of Epic Games, and the creator of Unreal Engine, a game development platform.
Digital Extremes Ltd. is a Canadian video game developer founded in 1993 by James Schmalz. They are best known for creating Warframe, a free-to-play cooperative online action game, and co-creating Epic Games' Unreal series of games. Digital Extremes is headquartered in London, Ontario. In 2014, 61% of the company was sold to Chinese holding company Multi Dynamic, now Leyou, for $73 million. In May 2016 Leyou exercised a call option and increased their stake to 97% of Digital Extremes for a total consideration of $138.2 million US. In December 2020, Tencent bought Leyou for 1.3 billion dollars, which included the majority stake in Digital Extremes that Leyou held.
Unreal Engine 4 (UE4) is the fourth version of Unreal Engine developed by Epic Games. UE4 began development in 2003 and was released in March 2014, with the first game using UE4 being released in April 2014. UE4 introduced support for physically based materials and a new visual programming language called "Blueprints". It was succeeded by Unreal Engine 5.
Unreal Engine 1 (UE1) is the first version of the Unreal Engine game engine. It was initially developed in 1995 by Epic Games founder Tim Sweeney for Unreal. Epic later began to license the Engine to other game studios. It was succeeded by Unreal Engine 2.
Unity is a cross-platform game engine developed by Unity Technologies, first announced and released in June 2005 at Apple Worldwide Developers Conference as a Mac OS X game engine. The engine has since been gradually extended to support a variety of desktop, mobile, console, augmented reality, and virtual reality platforms. It is particularly popular for iOS and Android mobile game development, is considered easy to use for beginner developers, and is popular for indie game development.
Fortnite: Save the World is a looter shooter survival video game produced by Epic Games, part of the game Fortnite. It is a cooperative and sandbox-style game with elements of tower defense and played in hybrid-third-person. The game was initially released as a paid-for early access title for macOS, PlayStation 4, Windows, and Xbox One on July 25, 2017, with plans for a full free-to-play release announced in late 2018. Epic eventually opted to move the game to pay-to-play in June 2020. The retail versions of the game were published by Gearbox Software, while online distribution of the PC versions is handled by Epic's launcher.
Unreal Tournament is a cancelled first-person arena shooter video game developed by Epic Games. It was planned to be the ninth game in the Unreal franchise, the fifth game in the Unreal Tournament series, and the first entry since 2007's Unreal Tournament 3. The game utilizes Epic's Unreal Engine 4 and was planned for release for free on Microsoft Windows, OS X, and Linux. The game was released as a pre-alpha on August 13, 2014, but never completed due to Epic Games' focus on Fortnite Battle Royale.
Steven Polge is a game programmer, most noted for his work on Epic Games' Unreal series of games. Polge was hired by Epic in 1997 after creating the Reaper Bot, which is recognized by Guinness World Records as the first computer-controlled deathmatch opponent. In addition to programming on the franchise, he served as lead designer on Unreal Tournament 3, and has been credited on other Epic titles such as Gears of War, Shadow Complex and Fortnite.
Psyonix LLC is an American video game developer based in San Diego. It was founded in 2000 by Dave Hagewood with the team of his Internet-focused company WebSite Machines. After canceling its first two projects, Psyonix created VehicleMOD, a mod that adds vehicles to Unreal Tournament 2003. The game's developer, Epic Games, subsequently hired the studio to recreate this gameplay for a game mode in Unreal Tournament 2004. Psyonix subsisted off contract work and released its first original game, Supersonic Acrobatic Rocket-Powered Battle-Cars, in 2008. The game was not as successful as anticipated but Hagewood held on to the game's concept and had a small team prototype a sequel while the rest of the company worked on further contract projects. This sequel was released as Rocket League in 2015 and became a commercial success. Epic Games acquired the studio in May 2019.
Fortnite is an online video game and game platform developed by Epic Games and released in 2017. It is available in six distinct game mode versions that otherwise share the same general gameplay and game engine: Fortnite Battle Royale, a free-to-play battle royale game in which up to 100 players fight to be the last person standing; Fortnite: Save the World, a cooperative hybrid tower defense-shooter and survival game in which up to four players fight off zombie-like creatures and defend objects with traps and fortifications they can build; Fortnite Creative, in which players are given complete freedom to create worlds and battle arenas; Lego Fortnite, an open world survival game; Rocket Racing, a racing game; and Fortnite Festival, a rhythm game.
The Epic Games Store is a video game digital distribution service and storefront operated by Epic Games. It launched in December 2018 as a software client, for Microsoft Windows and macOS, and online storefront. Android and iOS versions of the store launched in August 2024, with the iOS version only available for European users. The service provides friends list management, game matchmaking, and other features. Epic Games has further plans to expand the feature set of the storefront but it does not plan to add as many features as other digital distribution platforms, such as discussion boards or user reviews, instead using existing social media platforms to support these.
Fortnite Creative is a sandbox game, developed and published by Epic Games, part of the video game Fortnite. It was released on December 6, 2018, for Android, iOS, macOS, Nintendo Switch, PlayStation 4, Windows, and Xbox One, and in November 2020 for PlayStation 5 and Xbox Series X/S.
Unreal Engine 5 (UE5) is the latest version of Unreal Engine developed by Epic Games. It was revealed in May 2020 and officially released in April 2022. Unreal Engine 5 includes multiple upgrades and new features, including Nanite, a system that automatically adjusts the level of detail of meshes, and Lumen, a dynamic global illumination and reflections system that leverages software as well as hardware accelerated ray tracing. The source code for Unreal Engine 5 is available on GitHub.
Epic Games, Inc. v. Apple Inc. was a lawsuit brought by Epic Games against Apple in August 2020 in the United States District Court for the Northern District of California, related to Apple's practices in the iOS App Store. Epic Games specifically had challenged Apple's restrictions on apps from having other in-app purchasing methods outside of the one offered by the App Store. Epic Games's founder Tim Sweeney had previously challenged the 30% revenue cut that Apple takes on each purchase made in the App Store, and with their game Fortnite, wanted to either bypass Apple or have Apple take less of a cut. Epic implemented changes in Fortnite intentionally on August 13, 2020, to bypass the App Store payment system, prompting Apple to block the game from the App Store and leading to Epic filing its lawsuit. Apple filed a countersuit, asserting Epic purposely breached its terms of contract with Apple to goad it into action, and defended itself from Epic's suit.
StageCraft is an on-set virtual production visual effects technology composed of a video wall designed by Industrial Light & Magic (ILM) for the Disney+ series The Mandalorian. It has since been used in other productions and has been cited as a revolutionary visual effects technology. The soundstage in which StageCraft is implemented is called The Volume.
On-set virtual production (OSVP) is an entertainment technology for television and film production in which LED panels are used as a backdrop for a set, on which video or computer-generated imagery can be displayed in real-time. The use of OSVP became widespread after its use in the first season of The Mandalorian (2019), which used Unreal Engine, developed by Epic Games.
So Tim Sweeney is the founder and CEO of Epic and he is a computer scientist and has been interested in programming for a long time. So he knows about Haskell and loves Haskell actually. So I think that's why he thought of people like me and Lennart and was keen to have us. But Verse isn't a Haskell clone by any means. It's a language that Tim has been designing sort of in his head actually for – I don't really quite know how long, I should ask him – around a decade. So it's informed by functional programming and imperative programming and game programming and logic programming. There's a lot going on in Verse. Lennart's and my job is to sort of reverse engineer Verse out of tim's head and get it set down in a kind of formal semantics that everybody else can make make sense of.