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, 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 obsoleted by Source 2007 (also known as Orange Box) branch. It requires 
Half-Life 2 content to operate.
The SDK and SDK Base game for this branch are free to all Steam users.
Contents
Features
New since 
Source 2004:
- High Dynamic Range rendering (DX9+)
- 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.- 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.
- Dynamic interactions
- Dynamic interactions between NPCs using special animations.
- Lightwarp textures (DX9.0c+)
- 1D textures that tint a material per-texel depending on their brightness.
- Direct3D 9 - Shader Model 3 (
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.
Note:Some features above are only available with Direct3D 9 or later.Removed features
- DirectX 6.0 (
dxlevel 60) compatibility level - Support for DirectX 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 Source 2006 and previous titles that are upgraded from Source 2004 to Source 2006 are now currently using 
Source 2013 Singleplayer or 
Source 2013 Multiplayer.
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 Player2006
Dark Messiah of Might and Magic2007
Eternal Silence2007
Fortress Forever2007
INSURGENCY: Modern Infantry Combat2007Iron 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)
References
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