Developer commentary

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FileCommentary node.jpg|right|250px|thumb|The commentary node model used in the ''Half-Life 2'' series.
FileCommentary node grey.jpg|right|250px|thumb|Commentary node model skin used after the commentary has been listened to.

The in-game '''Developer commentary''', turned off by default, is intended to give players an insight into the development process of the game, as well as offering interesting information which might not have been obvious initially. 

Valve introduced the feature in ''Half-Life 2 Lost Coast'' and later acquainted it with ''Episode One'', ''Episode Two'', ''Portal'', ''Portal 2'', ''wcleft4deadLeft 4 Dead|Left 4 Dead'', ''wcleft4dead2Left 4 Dead 2|Left 4 Dead 2''  and ''http//wiki.teamfortress.com/wiki/Team_Fortress_2 Team Fortress 2''.

==Overview==
*The icons can be activated by enabling developer commentary from the options dialog box. Pressing the USE key whilst the crosshair is hovering over the icon in-game causes them to begin playing, and the same key again stops the sound. Distance from the icon is not a factor, as an icon can be activated from any proximity as long as it is visible.

*The icons play recordings of Valve team members or voice actors, who talk about behind-the-scenes information, including how or why they made the map, an enemy, a character, or a storyline idea, what happened in the earlier iterations of the map or area, and in the voice actors' case, how they coped with the voice acting.

*Sometimes, the nodes will take control of the player's camera in order to show different areas or techniques. An example of this can be seen in ''Lost Coast''; the screen is separated down the center to show the difference in rendering with HDR enabled and disabled.

*Activating a commentary node will also activate a number of side effects depending on the game temporarily disabling the game's AI, as in in ''Lost Coast'', or rendering the player invulnerable to enemy attacks, as in the ''Half Life 2'' Episodes. To counter this, achievements cannot be achieved whilst in commentary mode (except in the case of ''Portal 2'''s Single Player), as it makes the game easier. Activating a commentary node will not stop music or sounds.

*On all Valve games, the co-founder, Gabe Newell, will make the introductory commentary, which usually consists of an explanation of how to control the nodes. At the end of some games, he will make the final commentary.

==Appearances==
===''Half-Life 2 Lost Coast''===
*Gabe Newell
*Viktor Antonov
*Randy Lundeen
*http//www.mobygames.com/developer/sheet/view/developerId,22359/ Robin Walker
*http//www.mobygames.com/developer/sheet/view/developerId,8270/ Gary McTaggart
*http//www.mobygames.com/developer/sheet/view/developerId,1514/ Chris Green

===''Half-Life 2 Episode One''===
{{Columns|4|
*Gabe Newell
*Greg Coomer
*Jay Stelly
*Marc Laidlaw
*Bill Van Buren
*http//www.mobygames.com/developer/sheet/view/developerId,22359 Robin Walker
*http//www.mobygames.com/developer/sheet/view/developerId,191685 Matt T. Wood
*Yahn Bernier
*http//www.mobygames.com/developer/sheet/view/developerId,41268 Jason Mitchell
*http//www.mobygames.com/developer/sheet/view/developerId,8270 Gary McTaggart
*Ken Birdwell
*http//www.mobygames.com/developer/sheet/view/developerId,56498 Bill Fletcher
*http//www.mobygames.com/developer/sheet/view/developerId,29122 Matt Scott
*http//www.mobygames.com/developer/sheet/view/developerId,56493 Charlie Brown
*Steve Bond
*Randy Lundeen
*Ted Backman
*http//www.mobygames.com/developer/sheet/view/developerId,228032 Keith Huggins
*http//www.mobygames.com/developer/sheet/view/developerId,57047 Scott Dalton
*http//www.mobygames.com/developer/sheet/view/developerId,16017 Brian Jacobson
*Doug Wood
*John Guthrie
*http//www.mobygames.com/developer/sheet/view/developerId,228045 John Morello
*Dhabih Eng
*Jim Dose
*http//www.mobygames.com/developer/sheet/view/developerId,157016 Jake Nicholson
*Erik Wolpaw
*http//www.mobygames.com/developer/sheet/view/developerId,157007 Adrian Finol
*Kelly Bailey
*http//www.mobygames.com/developer/sheet/view/developerId,157003 Jason Deakins
*http//www.mobygames.com/developer/sheet/view/developerId,182213 Gautam Babbar
*http//www.mobygames.com/developer/sheet/view/developerId,1514 Chris Green
*Chet Faliszek
*http//www.mobygames.com/developer/sheet/view/developerId,29309 Ido Magal
*http//www.mobygames.com/developer/sheet/view/developerId,228036 Steve Kalning
*Tom Leonard
*http//www.mobygames.com/developer/sheet/view/developerId,59390 Charlie Burgin
*Laura Dubuk
*http//www.mobygames.com/developer/sheet/view/developerId,91580 Wade Schin
*http//www.mobygames.com/developer/sheet/view/developerId,6359 Erik Johnson
*http//www.mobygames.com/developer/sheet/view/developerId,228031 Jeff Hameluck
*http//www.mobygames.com/developer/sheet/view/developerId,180187 Lars Jensvold
}}

===''Portal''===
{{Columns|4|
*Gabe Newell
*Erik Wolpaw
*Kim Swift
*Jeep Barnett
*http//www.mobygames.com/developer/sheet/view/developerId,228048 Garret Rickey
*http//www.mobygames.com/developer/sheet/view/developerId,32409 Paul Graham
*Greg Coomer
*Bill Van Buren
*Realm Lovejoy
*http//www.mobygames.com/developer/sheet/view/developerId,57047 Scott Dalton
*Randy Lundeen
*Jeremy Bennett
*http//www.mobygames.com/developer/sheet/view/developerId,22359 Robin Walker
*http//www.mobygames.com/developer/sheet/view/developerId,157018 Bay Raitt
*http//www.mobygames.com/developer/sheet/view/developerId,128752 Jason Brashill
*http//www.mobygames.com/developer/sheet/view/developerId,157002 Kerry Davis
*http//www.mobygames.com/developer/sheet/view/developerId,228037 David Kircher
*http//www.mobygames.com/developer/sheet/view/developerId,111116 Nick Maggiore
*Chet Faliszek
*http//www.mobygames.com/developer/sheet/view/developerId,146597 Chris Chin
*http//www.mobygames.com/developer/sheet/view/developerId,180187 Lars Jensvold
*Ellen McLain
}}

===''Half-Life 2 Episode Two''===
{{Columns|4|
*Gabe Newell
*http//www.mobygames.com/developer/sheet/view/developerId,6359 Erik Johnson
*Marc Laidlaw
*Jeremy Bennett
*http//www.mobygames.com/developer/sheet/view/developerId,41268 Jason Mitchell
*http//www.mobygames.com/developer/sheet/view/developerId,182213 Gautam Babbar
*http//www.mobygames.com/developer/sheet/view/developerId,290466 Gray Horsfield
*http//www.mobygames.com/developer/sheet/view/developerId,146597 Chris Chin
*http//www.mobygames.com/developer/sheet/view/developerId,290464 Joe Han
*Ted Backman
*http//www.mobygames.com/developer/sheet/view/developerId,28174 Joshua Weier
*http//www.mobygames.com/developer/sheet/view/developerId,228036 Steve Kalning
*http//www.mobygames.com/developer/sheet/view/developerId,116269 Elan Ruskin
*Doug Wood
*Erik Wolpaw
*Chet Faliszek
*Bill Van Buren
*http//www.mobygames.com/developer/sheet/view/developerId,1514 Chris Green
*Randy Lundeen
*http//www.mobygames.com/developer/sheet/view/developerId,157023 Carl Uhlman
*http//www.mobygames.com/developer/sheet/view/developerId,128752 Jason Brashill
*Dario Casali
*http//www.mobygames.com/developer/sheet/view/developerId,65063 Philip Co
*John Morello
*http//www.mobygames.com/developer/sheet/view/developerId,228055 Danika Wright
*John Guthrie
*http//www.mobygames.com/developer/sheet/view/developerId,157025 Matt Wright
*http//www.mobygames.com/developer/sheet/view/developerId,59390 Charlie Burgin
*Jay Stelly
*http//www.mobygames.com/developer/sheet/view/developerId,29309 Ido Magal
*http//www.mobygames.com/developer/sheet/view/developerId,157010 Leslie Hall
*http//www.mobygames.com/developer/sheet/view/developerId,290475 Eric Strand
*http//www.mobygames.com/developer/sheet/view/developerId,157003 Jason Deakins
*Kelly Bailey
*http//www.mobygames.com/developer/sheet/view/developerId,204049 Alex Vlachos
*Vitaly Genkin
*http//www.mobygames.com/developer/sheet/view/developerId,8270 Gary McTaggart
*http//www.mobygames.com/developer/sheet/view/developerId,57047 Scott Dalton
*http//www.mobygames.com/developer/sheet/view/developerId,16017 Brian Jacobson
*Ken Birdwell
*Greg Coomer
*http//www.mobygames.com/developer/sheet/view/developerId,290461 Mike Durand
*http//www.mobygames.com/developer/sheet/view/developerId,157021 Aaron Seeler
*Jason Ruyman
*http//www.mobygames.com/developer/sheet/view/developerId,29122 Matt Scott
*http//www.mobygames.com/developer/sheet/view/developerId,157031 Jason Holtman
*http//www.mobygames.com/developer/sheet/view/developerId,5182 Scott Lynch
*http//www.mobygames.com/developer/sheet/view/developerId,191685 Matt T. Wood
*Doug Lombardi
*Yahn Bernier
*http//www.mobygames.com/developer/sheet/view/developerId,157000 Julie Caldwell
*http//www.mobygames.com/developer/sheet/view/developerId,108624 Quintin Doroquez
*http//www.mobygames.com/developer/sheet/view/developerId,290456 Iestyn Bleasdale-Shepherd
*http//www.mobygames.com/developer/sheet/view/developerId,6480 John Cook
*http//www.mobygames.com/developer/sheet/view/developerId,228030 Kathy Gehrig
*http//www.mobygames.com/developer/sheet/view/developerId,29184 Steve McClure
*http//www.mobygames.com/developer/sheet/view/developerId,290470 Milton Ngan
*http//www.mobygames.com/developer/sheet/view/developerId,111116 Nick Maggiore
*http//www.mobygames.com/developer/sheet/view/developerId,180187 Lars Jensvold
*http//www.mobygames.com/developer/sheet/view/developerId,157014 Bryn Moslow
*http//www.mobygames.com/developer/sheet/view/developerId,53766 David Sawyer
*http//www.mobygames.com/developer/sheet/view/developerId,50195 Jess Cliffe
*http//www.mobygames.com/developer/sheet/view/by_genre/developerId,290474 Jeff Sorenson
*Jeff Lind
*http//www.mobygames.com/developer/sheet/view/developerId,157009 Chris Grinstead
*http//www.mobygames.com/developer/sheet/view/developerId,157019 Alfred Reynolds
*http//www.mobygames.com/developer/sheet/view/developerId,157002 Kerry Davis
*http//www.mobygames.com/developer/sheet/view/developerId,228026 Joe Demers
*Jennifer Seeley
*http//www.mobygames.com/developer/sheet/view/developerId,228053 Doug Valente
*Mike Blasczak
*Mike Dunkel
*David Speyrer
*Chris Douglas
*http//www.mobygames.com/developer/sheet/view/developerId,228041 Dan LeFree
*Richard Lord
*http//www.mobygames.com/developer/sheet/view/developerId,157022 Taylor Sherman
*http//www.mobygames.com/developer/sheet/view/developerId,228050 Marc Scaparro
*http//www.mobygames.com/developer/sheet/view/developerId,290472 Matt Rhoten
*http//www.mobygames.com/developer/sheet/view/developerId,290480 Greg Winkler
*http//www.mobygames.com/developer/sheet/view/developerId,290468 John McCaskey
*http//www.mobygames.com/developer/sheet/view/developerId,6070 Eric Twelker
*http//www.mobygames.com/developer/sheet/view/developerId,290482 Torsten Zabka
*http//www.mobygames.com/developer/sheet/view/developerId,157017 Martin Otten
*http//www.mobygames.com/developer/sheet/view/developerId,56498 Bill Fletcher
*http//www.mobygames.com/developer/sheet/view/developerId,56492 Derrick Birum
*Tom Leonard
*Steve Bond
*http//www.mobygames.com/developer/sheet/view/developerId,228027 Katie Engel
*http//www.mobygames.com/developer/sheet/view/developerId,265311 Jon Huisingh
*http//www.mobygames.com/developer/sheet/view/developerId,12182 Tim Larkin
*Merle Dandridge
}}

===''Portal 2''===
{{Columns|4|
*Gabe Newell
*Scott Dalton
*Ivan Simonici
*Karen Prell
*David Sawyer
*Cayle George
*Alireza Razmpoosh
*Marcus Egan
*Phil Co
*Kelly Thornton
*Alex Vlachos
*Mike Morasky
*Thorsten Scheuermann
*Kristopher Katz
*Gray Horsfield
*Adam Foster
*Zachary Franks
*Greg Cherlin
*Jess Cliffe
*Dave Saunders
*Eric Tams
*Olivier Nallet
*John Guthrie
*Randy Lundeen
*Kyle Monroe
*Elan Ruskin
*Doug Wood
*Erik Robson
*Dario Casali
*Jay Pinkerton
*Erik Wolpaw
*Noel McGinn
*Joel Shoop
*Mike Belzer
*Keith Lango
*Christen Coomer
*Laura Dubuk
*Tim Larkin
*Dave Kircher
*Matt T. Wood
*Gautam Babbar
*Ted Backman
*Josh Weier
*Iestyn BleasdaleShepherd
*Brian Jacobson
*Chris Boyd
*Andrea Wicklund
*Danika Wright
*Garret Rickey
*Gary McTaggart
*David Feise
*Andrew Burke
*Matthew Scott
*Keith Lango
*Tristan Reidford
*Aaron Nicholls
*Matt Charlesworth
*Richard Lord
*Jeremy Bennett
*Matt Wright
*Ido Magal
*Marc Nagel
*Torsten Zabka
*Matthew Russell
*Brett English
*Ted Rivera
*Tejeev Kohli
*Bronwen Grimes
*Bank Charnchaichujit
*Sergiy Migdalskiy
*Vitaliy Genkin
*http//www.mobygames.com/developer/sheet/view/developerId,146597 Chris Chin
*Chet Faliszek
*Jeep Barnett
*http//www.mobygames.com/developer/sheet/view/developerId,29122 Matthew Scott
*Realm Lovejoy
*Marc Laidlaw
*Bill Van Buren
*http//www.mobygames.com/developer/sheet/view/developerId,223445 Kutta Srinivasan
*Aaron Barber
*http//www.mobygames.com/developer/sheet/view/developerId,429910 Michael Marcus
}}

==List of appearances==
*''Half-Life 2 Lost Coast'' {{1st}}
*''Half-Life 2 Episode One''
*''Portal''
*''Half-Life 2 Episode Two''
*''Portal 2''

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