View source for Source 2006

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<span style="color:white; font-weight: bold;"> {{For|about=the Source 2006 engine branch|the documentation on Source SDK Base 2006|[[Source SDK Base]]|}} </span>

[[File:Source_HDR_comparison.jpg|thumb|320px|HDR was one of the features first demonstrated with {{hl2lc|2}}, a tech demo. HDR was later added to {{dods|2}} (2005) and {{src06|2}}. This image compares between LDR, LDR with Bloom and HDR.]]
The {{src06|4}} engine branch, also known as the '''Episode One''' engine branch, and the last '''Old Engine''' branch, was first used in 2005 with {{hl2lc|4}} and {{dods|4}}, but was not properly released until 2006 with {{hl2ep1|4}}, with previous multiplayer games ({{css}}, {{hl2dm}}, and {{hldms}}) also being upgraded to the {{src06|2}} branch then. It was distributed in "base source engine 2.gcf." It was obsoleted by {{src07|3.1}} (also known as Orange Box) branch. It requires {{hl2|2}} content to operate.

The [[Source SDK|SDK]] and [[SDK Base]] game for this branch are free to all Steam users.

== Features ==

New since {{src04|4}}:

; [[High Dynamic Range|High Dynamic Range rendering]] {{dx9}}
: A simulation of brightness values outside computer monitors' actual range, and of [[wikipedia:Aperture|aperture]] adjustment.
:{{MConfirm|HDR actually predates Source 2006? See [https://advances.realtimerendering.com/s2006/Mitchell-ShadingInValvesSourceEngine.pdf PDF]. Lost Coast did not use "base source engine 2.gcf", and DODS only used it after an update. Also {{sineps|2}}, a Source 2004 game, have non-functional HDR console command {{cmd|mat_hdr_enabled}}. Similarly, Lost Coast also support dxlevel 95, before Source 2006.}}
; Film grain post-processing effect
: Used in {{dods|2}}.
; [[Color Correction|Color correction]]
: Alter the color balance of an image to achieve a desired effect. For example, in {{dods|2}}, the color has been adjusted to be more desaturated.
; [[Phong materials]]
: Diffuse reflections for skin and other roughened surfaces on [[model]]s.
; [[Choreography creation|Facial animation upgrades]]
: More detail and intenser shapes for close-up performances.
; [[Dynamic interactions]]
: Dynamic interactions between NPCs using special animations.
; [[$lightwarptexture|Lightwarp textures]] {{dx95}}
: 1D textures that tint a material per-texel depending on their brightness.
; [[mat_dxlevel|Direct3D 9 - Shader Model 3]] ({{code|style=2|dxlevel 95}})
: Unlocks greatly improved shader performance.
; [[Detail Props#Shapes|Detail prop shapes]]
: Improved detail sprites that sway in the breeze and bend away from nearby players.
; [[BSP_(Source)#Versions|BSP version 20]]
: New BSP version, with new lumps.
{{Note|Some features above are only available with Direct3D 9 or later.}}

== Removed features ==
; [[DirectX]] 6.0 ({{code|dxlevel 60}}) compatibility level
: Support for DirectX [[DirectX Versions#DirectX 6.0|6.x]] GPUs has been partially dropped, but still usable.

== Availability  ==
Gamecode for the 2006 branch is included in the now-deprecated [[Source SDK]] app. All Valve games introduced with {{src06|3.1}} and previous titles that are upgraded from {{src04|2}} to {{src06|2}} are now currently using {{src13sp|2}} or {{src13mp|2}}. To compile the code for 2006 branch, see [[Compiling under VS2005]].

== Usage ==
{{see also|[[:Category:Source 2006 engine branch games]]}}
The following games still run on {{src06|4}}:

=== Valve ===
* {{Code|style=2|2006}} {{Srcsdk06|4}}

=== Third-Party ===
* {{Code|style=2|2006}} {{ship|4}} and {{shipsp|4}}
* {{Code|style=2|2006}} {{dmmm|4}}
* {{Code|style=2|2007}} {{esilence|4}}
* {{Code|style=2|2007}} {{ff|4}}
* {{Code|style=2|2007}} {{InsurgencyMIC|4}}
* {{Code|style=2|2007}} [[Iron Grip: The Oppression]]{{confirm}}
* {{Code|style=2|2009}} {{NT|4.1}}
* {{Code|style=2|2010}} {{Vindictus|4}}
** Heavily modified, and uses proprietary file format to store game files. Also support [[Direct3D]] (DirectX) 11.

== Known issues ==
{{Bug|hidetested=1|All Source 2004 and 2006 games suffered from the gray fog bug, which was affected on newer GPUs (since GeForce 8000 series or newer AMD/ATI GPUs) and newer drivers. This has been fixed on NVIDIA systems since driver version "516.5x" (confirmed on RTX 3060),{{Cite|1}}{{Cite|2}} but likely still present on AMD/Intel. This issue is not affected when using {{code|dxlevel 81}} or lower, only {{code|dxlevel 90}} or higher.}}
{{Bug|tested=GMOD 9, HL2 old engine|Switching resolutions in some of Source 2006 games, may cause the right side of the HUD (ammo) to be improperly scaled. Some console text such as one that displayed by enabling {{code|cl_showfps}} or {{code|cl_showpos 1}}, will be either cut off or completely hidden.}}

== System Requirements ==

<p style="color:white; font-weight:bold">Minimum Specs :</p>
*OS: Windows [[WP:Windows 98|98]] / [[WP:Windows ME|ME]], [[WP:Windows 2000|2000]], [[WP:Windows XP|XP]] or later
*[[WP:Central processing unit|CPU]]: 1.2 [[WP:Hertz|GHz]] 
*[[WP:Random-access memory|RAM]]: 256 [[WP:Megabyte|MB]] 
*Nvidia GeForce FX 5700, ATI Radeon 9500 (with 128MB [[WP:Video random-access memory|VRAM]])
*[[WP:Direct3D|Direct3D]] 9.0 compatible [[WP:Video card|video card]] (with atleast DirectX 7.0 compatibility level or higher)

{{references|1=
{{ref2|cite id=1|access-date={{#time: F d, Y }}|[https://www.vogons.org/viewtopic.php?p{{=}}1088622#p1088622 Source DirectX9 grey fog bug]<br>'''a0divided:''' This bug basically only happens while using DX9 with games that run on pre-Orangebox versions of Source, like Sin as mentioned above or HL2 & EP1 before the 2010 engine update.

But what's interesting is that this bug was fixed at some point by Nvidia, at least on their newer cards with the latest drivers. I currently have an RTX 3060 Laptop GPU with driver 516.5 and the fog actually works properly on DX9. Unfortunately, I think it's still bugged with AMD or Intel GPUs...}}
{{ref2|cite id=2|Verified by [[User:Kr0tchet|leonidakarlach]] ([[User talk:Kr0tchet|talk]]) 01:36, 14 September 2024 (PDT):<br>Appeared to be fixed. Using RTX 3060 (desktop) and driver version 560.81. Using something like DgVoodoo2 would break this again.}}
}}

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