Source 2006
Half-Life 2: Lost Coast, a tech demo. HDR was later added to 
Day of Defeat: Source (2005) and 
Source 2006. This image compares between LDR, LDR with Bloom and HDR.The Source 2006 engine branch, also known as the Episode One engine branch, and the last Old Engine branch, was first used in 2005 with Half-Life 2: Lost Coast and Day of Defeat: Source (with 
Half-Life 2 updated to run on this branch), but was not properly released until 2006 with 
Half-Life 2: Episode One, with previous multiplayer games (
, 
, and 
) also being upgraded to the Source 2006 branch then. It was distributed in "base source engine 2.gcf." It was succeeded by Source 2007 (also known as Orange Box) branch, but still receiving engine updates until December 2009. It requires Half-Life 2 content to operate.
The engine versions for this branch are build 2547 (Lost Coast) or 2761 (EP1) up to 4044 (Protocol 7).
The SDK and SDK Base game for this branch are free to all Steam users.
Features
New since 
Source 2004:
- High Dynamic Range rendering (DX9 SM2)
- A simulation of brightness values outside computer monitors' actual range, and of aperture adjustment.
Confirm:HDR actually predates Source 2006? See PDF. Lost Coast did not use "base source engine 2.gcf", and DODS only used it after an update. Also 
SiN Episodes, a Source 2004 game, have non-functional HDR console command mat_hdr_enabled. Similarly, Lost Coast also support dxlevel 95, before Source 2006.- Film grain post-processing effect
- Used in Day of Defeat: Source.
- Color correction
- Alter the color balance of an image to achieve a desired effect. For example, in Day of Defeat: Source, the color has been adjusted to be more desaturated.
- Phong materials
- Diffuse reflections for skin and other roughened surfaces on models.
- Facial animation upgrades
- More detail and intenser shapes for close-up performances.
- Commentary System
- Allows DVD-like director's commentary to be embedded inside levels.
- Dynamic interactions
- Dynamic interactions between NPCs using special animations.
- Lightwarp textures (DX9+ SM3)
- 1D textures that tint a material per-texel depending on their brightness.
- Direct3D 9 - Shader Model 3 (DirectX 9.0+ feature level/dxlevel 95)
- Unlocks greatly improved shader performance.
- Detail prop shapes
- Improved detail sprites that sway in the breeze and bend away from nearby players.
- BSP version 20
- New BSP version, with new lumps.
- Patching levels with lump files - update entity lumps, changing a .BSP file's entities without recompiling the maps.
Note:Some features above are only available with Direct3D 9, dxlevel 95 (DX9.0+ level) or later.Removed features
- DirectX 6.0 (dxlevel 60) compatibility level
- Support for DirectX 6.x GPUs has been partially dropped, but still usable.
- Steam Friends & Parlor Games menu
- Originally present before it was eventually removed in favor of Steam Overlay which is introduced in 2009. Servers for Steam Friends feature was also shut down.
- 64-bit support
- Originally, Half-Life 2 and Half-Life 2: Lost Coast (runs on early version of Source 2006, with the former also upgraded to that branch) had a 64-bit version of the engine, allowing it to access more than 2GB (4GB with LAA) of RAM, and increase performance slightly. However it was later discontinued and removed due to its instability on some systems.
Availability
Gamecode for the 2006 branch is included in the now-deprecated Source SDK app. All Valve games introduced with Source 2006 and previous titles that are upgraded from Source 2004 to Source 2006 are now currently using 
Source 2013 Singleplayer or 
Team Fortress 2 branch (previously 
Source 2013 Multiplayer). To compile the code for 2006 branch, see Compiling under VS2005.
Usage
The following games still run on Source 2006:
Valve
- 2006 Source SDK Base 2006
Third-Party
- 2006
The Ship: Murder Party and The Ship: Single Player - 2006
Dark Messiah of Might and Magic - 2007
Eternal Silence - 2007
Fortress Forever - 2007
INSURGENCY: Modern Infantry Combat - 2007 Iron Grip: The Oppression[confirm]
- 2009
NEOTOKYO° - 2010
Vindictus
- Heavily modified, and uses proprietary file format to store game files. Also support Direct3D (DirectX) 11.
Known issues
Bug: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),[1][2] but likely still present on AMD/Intel. This issue is not affected when using dxlevel 81 or lower, only dxlevel 90 or higher.Bug: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 cl_showfps or cl_showpos 1, will be either cut off or completely hidden. (tested in: GMOD 9, HL2 old engine)System Requirements
Minimum Specs :
- OS: Windows 98 / ME, 2000, XP or later
- CPU: 1.2 GHz
- RAM: 256 MB
- Nvidia GeForce FX 5700, ATI Radeon 9500 (with 128MB VRAM)
- Direct3D 9.0 compatible video card (with atleast DirectX 7.0 compatibility level or higher)
Note:Due to Steam dropping support for previous version of Windows, Windows 10 or later is required to run any Source 2006 games that use Steam DRM.References
| References | ||||
|---|---|---|---|---|
|
