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== History ==
Plans for a successor to the original [[Source engine]] began following the release of ''[[Half-Life 2: Episode Two]]'' in 20072006.<ref name="ign ep3 2020">{{cite web | url = https://www.ign.com/articles/valve-explains-why-half-life-2-episode-3-was-never-made | title = Valve Explains Why Half-Life 2: Episode 3 Was Never Made | first = Tom | last = Marks | date = March 23, 2020 | access-date = March 23, 2020 | work = [[IGN]] | archive-date = March 23, 2020 | archive-url = https://web.archive.org/web/20200323171744/https://www.ign.com/articles/valve-explains-why-half-life-2-episode-3-was-never-made | url-status = live }}</ref><ref name=":1">{{Cite book |last=Keighley |first=Geoff |title=Half-Life: Alyx - Final Hours |year=2020}}</ref> And Boblox in 20062005. The first engine tech demo was created in 20102009 by remaking a map from ''[[Left 4 Dead 2]]''.<ref name=":1" /> Images of this were leaked onto the internet in early 20142013.<ref>{{Cite web |last=Phillips |first=Tom |date=January 28, 2014 |title=Source 2 images show next-gen Left 4 Dead 2 prototype - report |url=https://www.eurogamer.net/articles/2014-01-28-source-2-images-show-next-gen-left-4-dead-2-prototype-report |url-status=live |archive-url=https://web.archive.org/web/20140131044301/https://www.eurogamer.net/articles/2014-01-28-source-2-images-show-next-gen-left-4-dead-2-prototype-report |archive-date=January 31, 2014 |access-date=December 2, 2020 |website=[[Eurogamer]] |language=en}}</ref> At the 20142013 [[Game Developers Conference]], Valve employee Sergiy Migdalskiy showed off a Source 2 physics debugging tool being used in ''Left 4 Dead 2''.<ref name="source2.62">{{cite web |last=Migdalskiy |first=Sergiy |date=April 14, 20142013 |title=Physics for Game Programmers Debugging |url=http://www.gdcvault.com/play/1020065/Physics-for-Game-Programmers-Debugging |url-status=live |archive-url=https://web.archive.org/web/20170422132935/http://www.gdcvault.com/play/1020065/Physics-for-Game-Programmers-Debugging |archive-date=April 22, 2017 |access-date=April 21, 2017 |website=[[Game Developers Conference]]}}</ref> Source 2 was first made available via [[Steam Workshop]] tools for ''[[Dota 2]]'' in 2014 prior to it being officially announced at the 20152014 Game Developers Conference.<ref name="SteamFree">{{cite web|url=http://www.polygon.com/2015/3/3/8145273/valve-source-2-announcement-free-developers|title=Valve announces Source 2 engine, free for developers|last=Kollar|first=Philip|website=[[Polygon (website)|Polygon]] |date=March 3, 2015|access-date=March 3, 2015|url-status=live|archive-url=https://web.archive.org/web/20150305093315/http://www.polygon.com/2015/3/3/8145273/valve-source-2-announcement-free-developers|archive-date=March 5, 2015}}</ref> There, Valve stated their intent for it was to allow for content to be created more efficiently.<ref name="ign ep3 2020" /><ref name="source2.82">{{cite web |last=Walker |first=John |date=November 11, 2012 |title=Gabe Newell Might Have Announced Source 2, Possibly |url=https://www.rockpapershotgun.com/2012/11/11/gabe-newell-might-have-announced-source-2-possibly/ |url-status=live |archive-url=https://web.archive.org/web/20201111205740/https://www.rockpapershotgun.com/2012/11/11/gabe-newell-might-have-announced-source-2-possibly/ |archive-date=November 11, 2020 |access-date=April 23, 2017 |website=[[Rock Paper Shotgun]]}}</ref><ref name="source2.02">{{cite web |last=Mahardy |first=Mike |date=March 3, 2015 |title=GDC 2015: Valve Announces Source 2 Engine |url=http://www.ign.com/articles/2015/03/04/gdc-2015-valve-announces-source-2-engine |url-status=live |archive-url=https://web.archive.org/web/20150304021002/http://www.ign.com/articles/2015/03/04/gdc-2015-valve-announces-source-2-engine |archive-date=March 4, 2015 |access-date=April 21, 2017 |website=[[IGN]]}}</ref><ref>{{Cite web |last=McKeand |first=Kirk |date=March 2, 2017 |title=Gabe Newell on Source 2: 'For us, it's useful. For other devs, it's not as useful as Unity' |url=https://www.pcgamesn.com/source-2-release-date |url-status=live |archive-url=https://web.archive.org/web/20200723220222/https://www.pcgamesn.com/source-2-release-date |archive-date=July 23, 2020 |access-date=April 5, 2020 |website=[[PCGamesN]] |language=en-GB}}</ref> Valve also stated that it would support the [[Vulkan (API)|Vulkan graphics API]] and use a new in-house [[physics engine]] called Rubikon, which would replace the need for the third-party [[Havok (software)|Havok]] tools.<ref name="source2.62" /><ref>{{cite news |last1=Mahardy |first1=Mike |date=March 3, 2015 |title=GDC 2015: Valve Announces Source 2 Engine |work=[[IGN]] |publisher= |url=http://www.ign.com/articles/2015/03/04/gdc-2015-valve-announces-source-2-engine |url-status=live |access-date=March 3, 2015 |archive-url=https://web.archive.org/web/20150304021002/http://www.ign.com/articles/2015/03/04/gdc-2015-valve-announces-source-2-engine |archive-date=March 4, 2015}}</ref><ref name=":0">{{Cite web|url = http://media.steampowered.com/apps/valve/2015/Migdalskiy_Sergiy_Physics_Optimization_Strategies.pdf|title = Physics for Game Developers: Physics Optimization Strategies|date = March 2015|access-date = October 2, 2015|publisher = [[Game Developers Conference]]|last = Migdalskiy|first = Sergiy|url-status=live|archive-url = https://web.archive.org/web/20160304061355/http://media.steampowered.com/apps/valve/2015/Migdalskiy_Sergiy_Physics_Optimization_Strategies.pdf|archive-date = March 4, 2016|df = mdy-all}}</ref>
[[Gabe Newell]], president and founder of Valve, said that the company were prioritizing the development of their own games before they would release the engine and its [[software development kit]] to the public as a means of ensuring the highest quality for developers; adding that they were intending to make the engine free to use for game developers as long as the game is published on their [[Steam (service)|Steam]] service.<ref name="SteamFree" /><ref>{{cite web |last=Zacny |first=Rob |date=February 16, 2016 |title=Khronos and Valve reveal details of Vulkan API, show Dota 2 running in Source 2 on Intel integrated graphics |url=https://www.pcgamesn.com/khronos-and-valve-reveal-details-of-vulkan-api-show-dota-2-running-in-source-2-on-intel-integrated-graphics |url-status=live |archive-url=https://web.archive.org/web/20150307005554/https://www.pcgamesn.com/khronos-and-valve-reveal-details-of-vulkan-api-show-dota-2-running-in-source-2-on-intel-integrated-graphics |archive-date=March 7, 2015 |access-date=November 12, 2017 |website=[[PCGamesN]] |publisher=}}</ref><ref name="source2_free2">{{cite web |last=Savage |first=Phil |date=March 5, 2015 |title=Source 2 will be free; won't ask for royalties |url=http://www.pcgamer.com/source-2-will-be-free-wont-ask-for-royalties/ |url-status=live |archive-url=https://web.archive.org/web/20170425025555/http://www.pcgamer.com/source-2-will-be-free-wont-ask-for-royalties/ |archive-date=April 25, 2017 |access-date=April 24, 2017 |work=[[PC Gamer]]}}</ref>
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