Editing Source (game engine) (section)

=== Source 2 ===
{{main|Source 2}}
Source 2 was announced by Valve as the successor to Source at the [[Game Developers Conference]] in March 2015.<ref>{{cite web |last=Kollar |first=Philip |date=March 3, 2015 |title=Valve announces Source 2 engine, free for developers |website=[[Polygon (website)|Polygon]] |url=http://www.polygon.com/2015/3/3/8145273/valve-source-2-announcement-free-developers |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 |access-date=March 3, 2015}}</ref> There, Valve stated that it would be free to use for developers, with support for the [[Vulkan (API)|Vulkan graphical API]], as well as using a new in-house [[physics engine]] called Rubikon.<ref>{{cite news |last1=Mahardy |first1=Mike |title=GDC 2015: Valve Announces Source 2 Engine |url=http://www.ign.com/articles/2015/03/04/gdc-2015-valve-announces-source-2-engine |access-date=March 3, 2015 |publisher=[[IGN]] |date=March 3, 2015 |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}}</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 }}</ref> In June 2015, Valve announced that ''[[Dota 2]]'', originally developed with Source, would be ported over to Source 2 in an update called ''[[Dota 2 Reborn]]''.<ref>{{cite web |last1=Martin |first1=Michael |title=Valve Announces Dota 2 Reborn |url=http://www.ign.com/articles/2015/06/13/valve-announces-dota-2-reborn-open-beta-coming-next-week |url-status=live |archive-url=https://web.archive.org/web/20160629144536/http://www.ign.com/articles/2015/06/13/valve-announces-dota-2-reborn-open-beta-coming-next-week |archive-date=June 29, 2016 |access-date=July 10, 2016 |website=[[IGN]]|date=June 13, 2015 }}</ref><ref>{{cite web |last1=Macy |first1=Seth |title=Dota 2 Now Valve's First Ever Source 2 Game |date=September 9, 2015 |url=http://www.ign.com/articles/2015/09/09/dota-2-now-valves-first-ever-source-2-game |url-status=live |archive-url=https://web.archive.org/web/20150910075128/http://www.ign.com/articles/2015/09/09/dota-2-now-valves-first-ever-source-2-game |archive-date=September 10, 2015 |access-date=September 9, 2015 |publisher=[[IGN]]}}</ref> ''Reborn'' was first released to the public as an opt-in beta update that same month before officially replacing the original client in September 2015, making it the first game to use the engine.<ref>{{cite magazine |last=Livingston |first=Christopher |url=http://www.pcgamer.com/valve-announces-dota-2-reborn-new-engine-coming/ |title=Valve announces Dota 2 Reborn, new engine coming |date=June 12, 2015 |magazine=[[PC Gamer]] |access-date=June 13, 2015 |url-status=live |archive-url=https://web.archive.org/web/20150615040444/http://www.pcgamer.com/valve-announces-dota-2-reborn-new-engine-coming/ |archive-date=June 15, 2015}}</ref><ref>{{cite web |last1=Macy |first1=Seth |title=Dota 2 Now Valve's First Ever Source 2 Game |date=September 9, 2015 |url=http://www.ign.com/articles/2015/09/09/dota-2-now-valves-first-ever-source-2-game |url-status=live |archive-url=https://web.archive.org/web/20150910075128/http://www.ign.com/articles/2015/09/09/dota-2-now-valves-first-ever-source-2-game |archive-date=September 10, 2015 |access-date=September 9, 2015 |publisher=[[IGN]]}}</ref> The engine had succeeded Source by the late 2010s.