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===Unreal Engine 2===
<!-- [[File:Killing Floor Biohazard1.jpg|thumb|upright=1.2|left|''[[Killing Floor (video gamevideoxogo)|Killing Floor]]'' was builtconstruíuse inen Unreal Engine 2.]]
{{Software
| namenome = Unreal Engine 2
| released = Unreal Warfare build 633 / {{Start date and age|2001|01}}
| latestúltima_versión release= version = Unreal Engine 2.5 build 3369
| data_última_versión = Novembro de 2005
| latest release date = {{Start date and age|2005|11}}
| programming language = [[C++]] , UnrealScript
| operatingsistema_operativo system = [[Windows]], [[OS X]], [[Linux]]
| platform = [[Windows]], [[OS X]], [[Linux]], [[iOS]], [[Android (operating system)|Android]], [[GameCube]], [[PlayStation 2]], [[Xbox (console)|Xbox]]
| license licenza = [[Proprietarysoftware softwarepropietario|ProprietaryPropietaria]]
}}
A segunda versión do motor publicouse no 2002 con ''[[America's Army]]'', un ''shooter'' multixogador gratuíto crado polo [[Exército dos Estados Unidos de América|Exército dos Estados Unidos]] e financiado polo [[Goberno dos Estados Unidos de América|Goberno dos Estados Unidos]]. Nesta xeración tanto o código coma o motor de renderizado reescribíronse por completo. Incluía ademáis o [[editor de niveis]] UnrealEd 2 e o [[SDK]] de físicas Karma, responsable das [[físicas de boneco]] en ''[[Unreal Tournament 2003]]'' e ''[[Unreal Championship]]''.
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The second version was released in 2002 with ''[[America's Army]]'', a free multiplayer shooter created by the [[United States Army|US Army]] and financed by the [[U.S. government]]. This generation saw the core code and rendering engine completely re-written. In addition, it featured UnrealEd 2, a [[level editor]], which debuted with the previous generation of the engine and was shortly followed later by UnrealEd 3, along with the Karma physics SDK. This physics engine powered the [[ragdoll physics]] in ''[[Unreal Tournament 2003]]'' and ''[[Unreal Championship]]''. Other engine elements were also updated, with improved assets as well as adding support for the [[GameCube]] and the Xbox. Support for the PlayStation 2 console was previously added in UE1. Taking Xbox aside, both GameCube and PS2 were never supported directly by Epic, support being instead farmed out to [[Secret Level]]. As such, third parties looking to use further Unreal Engine revisions had to do their own builds throughout the generation, as they had to in more recent years with the Wii, X360, PS3, PSP, and 3DS.{{Citation needed | reason=This paragraph could use a citation, not just to source the material, but also as a guide to editors who might want to clarify some of the complicated sentences here. | date=July 2013 }}
UE2.5, an update to the original version of UE2, improved rendering performance and added vehicles physics, a particle system editor for UnrealEd, and 64-bit support in ''[[Unreal Tournament 2004]]''. A specialized version of UE2.5 called UE2X was used for ''[[Unreal Championship 2: The Liandri Conflict]]'' on the original Xbox platform. It features optimizations specific to that console. [[Environmental audio extensions#EAX 3.0|EAX 3.0]] is also supported for sound.
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