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<span style="color:white; font-weight: bold;"> {{For|about=the Orange Box (Source 2007) engine branch|the documentation on Source SDK Base 2007|[[Source SDK Base]]|}} </span>

{{src07}}{{src09}}{{srcmp}} The {{src07|3}} engine branch, also known as '''{{src07|3.1.nolink|nt=0alt}}''', was released in Oct 10, 2007 with the release of {{TOB|2}} ({{hl2ep2}}, {{portal}}, and {{tf2}}), succeeding the {{src06|2}} engine branch. {{Hl2|1}} and {{hl2ep1|1}} were also ported to {{src07|name}} only on consoles (until 2010 when the PC port of {{hl2|name}} and {{hl2ep1|name}} were later ported to 2009 branch).

It was maintained side-by-side with the {{l4dbranch|2}}, which, around this time, all first-party {{src06|name}} (except {{hls}}) and {{src07|name}} games were upgraded to {{src09|3}} (for singleplayer games) and {{srcmp|3}} (for multiplayer games) throughout until July 2010, when it was obsoleted by the release of the {{asbranch|2}}. Despite this, the {{src13sp|1}} and {{src13mp|1}} branches were released in 2013 as more direct upgrades for these games. 

In an attempt to stop [[Bunnyhopping]], Valve updated the movement system to cap the forward move speed, inadvertently creating [https://wiki.sourceruns.org/wiki/Accelerated_Back_Hopping Accelerated Back Hopping]. This branch also introduced few bugs noticeable in {{hl2|name}} (and it's episodes), such as the [[Dropship]] container gun no longer rotates, and thus unable to shoot unless you stand in the front of the gun, which significantly make the battle on the [[Sandtraps]] chapter much easier.

In May - June 2010, all first-party {{src06|name}} and {{src07|name}} games for {{PC|3.1}} '''(''except'' for {{hls|1}}, {{hldms|1}}, and {{hl2lc|1}})''' were upgraded to {{src09|1}}, which adds support for {{mac|1}}, aswell introducing achievements for PC/Mac version of {{hl2|name}} and {{hl2ep1|name}}<!-- EP2 already have achievements on X360/PS3, and this applies to PC aswell when it was released back in 2007.-->. Optionally, achievements are also supported on third-party mods.


The Orange Box builds on the original Half-Life 2 branch, requiring its content installed to work. 

==Versions==
There are three Orange Box branches, referred to in the SDK Launcher as {{src07|4.1}}, {{src09|4.1}}, and {{srcmp|4.1}}. The 2009 and MP branches do not have a different feature set, but they are incompatible with 2007 due to various under-the-hood changes (which include a different [[SteamID]] scheme and Mac OS X compatibility).

==Features==
New since the {{src06|4}} engine branch are:

==={{src07}} 2007===
; [[Threads|Threading]]
: Logic, rendering and audio have been threaded for performance gains in multi-core environments.
; [[:Category:Particle System|Soft particles]]
: An all-new, artist-driven particle system, replacing the old hard-coded particle system.
; [[env_projectedtexture|Shadow mapping]]
: Special dynamic lights such as the player's flashlight can now cast high-quality dynamic shadows.
; [[HDR|Improved High Dynamic Range rendering]]
: Remade HDR tonemapping that better fits outdoor scenes.{{ref|1}}
; Motion blur
: Cheap and simple camera motion blur.{{ref|1}}
; [[SFM/Introduction_To_HWM|Hardware Morph (HWM) flexes]] and [[Wrinklemaps|Wrinkle maps]]
: A new, powerful facial animation system, with support for textures that add fine wrinkling detail to the face during flex animation.
; [[Material_optimization#Conditional_statements|Conditional statements]]
: New conditional statements for use in [[materials]] to optimize them for lower-end machines.
; [[$phong#Colors|Phongwarp textures and other Phong improvements]]
: Source's phong shading, introduced in {{src06|2}}, has been upgraded with additional features such as reflection tinting, albedo tinting, phongwarp textures, and more.
; [[$ssbump|Self-shadowing bump maps]]
: A special, cheaper kind of bump map for brush shaders with baked in ambient occlusion to give the illusion of a self-shadowing surface.
; [[$seamless_scale|Automatic displacement texturing]]
: Mitigates texture stretching across displacement surfaces.
; [[$distancealpha|Alpha to coverage]]
: Vector-like edges to raster images, fast.
; [[$emissiveblend|Flowing emissive textures for models]]
: Advanced flowing emission for {{ent|VertexLitGeneric}}, notably used on the Vortigaunts in {{hl2ep2|4}}
; Fresnel for [[$envmap|specular reflections]] and [[$selfillum|self-illumination]] on models
: On {{mono|VertexLitGeneric}}, {{ent|$envmap}} and {{ent|$selfillum}} have new parameters to enable shading with the [http://www.3drender.com/glossary/fresneleffect.htm Fresnel effect].
; [[Cinematic Physics]]
: Baked physics animations that are rendered offline and brought into the engine for playback with minimal performance cost. {{todo|This isn't really new; GoldSrc did it in {{czds|2}}…}}
; Improved [[prop_static]] lighting
: Static props without normal maps or phong can now be lit by VRAD per-vertex, instead of at runtime based upon their [[origin]] or [[$illumposition]].
; [[BIK|Bink video]]
: A video codec used in game intros, such as the Valve intro during the game startup. It replaces the old video playback system which uses the [[AVI]] file format.
; [[Maplist Thumbnails]]
: A console-oriented [[server browser]] UI.
; {{Xbox360|4}} and basic {{ps3|4}} support
: Of little use to modders, needless to say! Aside from that, native support for the {{360|1}} controller when played on PC has been added, alongside with XInput support.
: The PlayStation 3 version was ported by EA (Electronic Arts) due to the complexity of the hardware at the time. This result in the game running worse than the {{360|1}} counterpart.

Additionally, the tools have been upgraded:
; [[func_viscluster|Visclusters]]
: A new entity to be placed in large open areas with unbroken visibility, reducing compile times.
; [[Texture shadows]]
: Static props can with transparent or translucent textures can now cast shadows based upon their alpha channel.
; [[DMX]] model format
: Deprecates [[SMD]]

==={{src09}}{{srcmp}} 2009/MP===
; {{mac|4|nt=2}} support
: Supported since 2010 engine update. The engine can now run on Mac. However, Mac support outside of official games may be spotty. <br>Furthermore, newer version of macOS since 10.15 (Catalina) no longer support all 32-bit apps and games in general (which also includes every single Source engine games that are complied for 32-bit only).
; QuickTime video (MOV) {{only|{{mac}}}}
: Replaces BINK video and only used on {{mac|4}} systems. Some games may also support Bink video on {{mac|4}}.
; Particle system adjustments
: Particles can now render [[Particle_System_Renderers#render_blobs|blobs]] and [[Particle_System_Renderers#render_models|models]].<br>Not available in subsequent branches (removed in {{src13|2}}, and not ported upstream to {{asbranch|2}}).
; Disable {{ent|phys_bone_follower}}s
: {{mono|phys_bone_follower}}s can now be disabled on dynamic props for performance gains and lower entity counts.

==={{src13}} 2013===
{{src13|4}} (both '''SP''' and '''MP''') has its own page.

== Removed features ==
=== {{Src07}} 2007 ===
Features that have been removed or deprecated in {{src07|4}} are:
; [[DirectX]] 7.0 ({{code|dxlevel 70}}) compatibility level
: Support for DirectX [[DirectX Versions#DirectX 7.0|7.x]] GPUs has been dropped.
;[[env_terrainmorph]] 
:env_terrainmorph dynamically morphs displacements by pulling vertices along a normal, similar to the Paint Geometry tool in Hammer.

==Availability==
Most games using this branch (except Console version of those games) were upgraded to the {{src13sp|4}} or {{src13mp|4}} branches when those released. Nevertheless, gamecode for the 2007 branch is included in the now-deprecated Source SDK app.

===<span style="color:{{src07|col}}">Source 2007</span>===
{{see also|[[:Category:Source 2007 engine branch games]]}}
==== Valve ====
* {{Code|style=2|2007}} {{src07|4|nt=2}} (formerly ''Source SDK Base - Orange Box'')
* {{Code|style=2|2007}} {{tobconsole|4}}
** {{Code|style=2|2008}} {{psa|4}} ({{360|4}} only)

==== Third-Party ====
* {{Code|style=2|2007}} {{aoc|4}}
* {{Code|style=2|2008}} {{Dmmm|4}} ({{360|4}} only)
* {{Code|style=2|2009}} {{obsc|4}} (ModDB version - Steam version runs on {{src13|4}})
* {{Code|style=2|2011}} {{eyedc|4}}
* {{Code|style=2|2012}} {{bms12|4}} (Mod version only)

===<span style="color:{{src09|col}}">Source 2009</span>===
{{see also|[[:Category:Source 2009 engine branch games]]}}
==== Third-Party ====
* {{Code|style=2|2009}} {{zc|4}}
* {{Code|style=2|2011}} {{p3|4}}
** Added PhysX physics engine for certain cloth models. Also contains a modified MDL format, certain features from {{l4dbranch|1}} ([[VPK]] v1), unique scripting language (Postal3Script), a system for using env_sprites for trees and hair, as well as a unique implementation of Nextbots. A former developer described it as such{{ref|1}}:
:: {{quote|1="We messed it up from the start. In the later stages we were trying to upgrade to the latest source version [<span style="color:{{src09|col}}">Source 2009</span>] with some luck – that was part of the multiplayer effort. But we messed a lot to a source engine core, we messed with client/server architecture. It is a miracle the game was working at all."}}

===<span style="color:{{srcmp|col}}">Source MP</span>===
==== Third-Party ====
* {{Code|2010}} {{bgt|4}}{{confirm}}

== System Requirements ==
These system requirements applies to [[Source SDK Base|Source SDK Base 2007]] (and some Source 2007/2009/MP game) only. Some other games may have their own system requirements.

<p style="color:white; font-weight:bold">Windows Minimum Specs :</p>
*OS: Windows [[WP:Windows XP|XP]], [[WP:Windows Vista|Vista]], [[WP:Windows 7|7]] or later
*[[WP:Central processing unit|CPU]]: 1.7 GHz and/or Dual-core 
*[[WP:Random-access memory|RAM]]: 1GB RAM
*GPU: NVIDIA GeForce 6xxx series, ATI Radeon X1600, Intel HD Graphics 3000 (with 128MB [[WP:Video random-access memory|VRAM]])
*[[WP:Direct3D|Direct3D]] 9.0 compatible [[WP:Video card|video card]] (with atleast DirectX 8.0 compatibility level or higher)
*NOTE: As Steam dropped support for previous version of Windows, all Source 2007/2009/MP branch games will require Windows 7/8/10 or later.

<p style="color:white; font-weight:bold">Mac OS Minimum Specs:</p>

*[[WP:OS X|OS X]] 10.5.8, 10.6.3 (up to 10.14.6)
*CPU: 2.0 GHz and/or Dual-core
*RAM: 1 GB
*GPU: NVIDIA GeForce 8xxx series, ATI Radeon X1600, Intel HD Graphics 3000<br>OpenGL 2.1 compatible
*Audio: OpenAL compatible

== References ==
<ol>
<li> [https://cdn.cloudflare.steamstatic.com/apps/valve/2008/GDC2008_PostProcessingInTheOrangeBox.pdf#page=22 Valve GDC 2008: Post Processing in The Orange Box]<br>
<li> [https://www.reddit.com/r/postal/comments/1cb2wtr/postal_3_dev_interview_programmer/ Interview with a Trashmasters dev who wished to remain anonymous]
</ol>
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