Editing Day of Defeat: Source (section)

===Technology===
[[Image:Dod source film effects.jpg|thumb|right|[[Depth of field]], [[color correction]] and [[film grain]] effects used in the trailer]]
''Day of Defeat: Source'' has been used by Valve as a platform for demonstrating several technologies in the [[Source engine]]. ''Day of Defeat: Source'' introduced a [[high dynamic range|dynamic audio system]] that was limited to [[non-player character]]s in ''Half-Life 2''.<ref name="PCGUK"/> The sound of each weapon firing in-game is attributed with distance and occlusion variables, which are processed and then fed back to the player. Sounds far from the player lack higher frequencies and thus sound more like they naturally would, allowing for the actions of other players on a [[grand strategy wargame|map]] to make up the [[ambient music|ambient sounds]] for the level.<ref name="PCGUK"/> The game was the first to incorporate Valve's [[high dynamic range rendering]], predating the official demonstration, ''[[Half-Life 2: Lost Coast]]''.<ref>{{cite web|url=http://www.bit-tech.net/gaming/2005/12/09/source_film_effects/|date=December 9, 2005|title=Cinematic effects in Source - Introduction|last=Smalley|first=Tim|access-date=October 22, 2007|publisher=[[bit-tech]]|url-status=dead|archive-url=https://web.archive.org/web/20071013195457/http://www.bit-tech.net/gaming/2005/12/09/source_film_effects/|archive-date=October 13, 2007|df=mdy-all}}</ref> Other effects were added post-release to make the game appear as if it were a [[World War II]] era film. The effects include [[motion blur]],<ref>{{cite web|url=http://www.bit-tech.net/gaming/2005/12/09/source_film_effects/3|date=December 9, 2005|title=Cinematic effects in Source - Motion Blur|last=Smalley|first=Tim|access-date=October 22, 2007|publisher=[[bit-tech]]|archive-date=September 11, 2007|archive-url=https://web.archive.org/web/20070911232207/http://www.bit-tech.net/gaming/2005/12/09/source_film_effects/3|url-status=live}}</ref> [[depth of field]],<ref>{{cite web|url=http://www.bit-tech.net/gaming/2005/12/09/source_film_effects/2|date=December 9, 2005|title=Cinematic effects in Source - Depth of Field|last=Smalley|first=Tim|access-date=October 22, 2007|publisher=[[bit-tech]]|archive-date=August 25, 2007|archive-url=https://web.archive.org/web/20070825011029/http://www.bit-tech.net/gaming/2005/12/09/source_film_effects/2|url-status=live}}</ref> [[film grain]]<ref>{{cite web|url=http://www.bit-tech.net/gaming/2005/12/09/source_film_effects/5|date=December 9, 2005|title=Cinematic effects in Source - Film Grain|last=Smalley|first=Tim|access-date=October 22, 2007|publisher=[[bit-tech]]|archive-date=October 18, 2007|archive-url=https://web.archive.org/web/20071018030209/http://www.bit-tech.net/gaming/2005/12/09/source_film_effects/5|url-status=live}}</ref> and [[color correction]].<ref>{{cite web|url=http://www.bit-tech.net/gaming/2005/12/09/source_film_effects/6|date=December 9, 2005|title=Cinematic effects in Source - Colour Correction|last=Smalley|first=Tim|access-date=October 22, 2007|publisher=[[bit-tech]]|archive-date=October 17, 2007|archive-url=https://web.archive.org/web/20071017032016/http://www.bit-tech.net/gaming/2005/12/09/source_film_effects/6|url-status=live}}</ref> [[Phong shading]] on the Source engine was added to ''Day of Defeat: Source'' with the major update in the second quarter of 2006.<ref name="Summer2006"/>