Source 2006

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.

Todo: HDR actually predates Source 2006; see PowerPoint.

Features

New since Source 2004:

High Dynamic Range rendering

A simulation of brightness values outside computer monitors' actual range, and of aperture adjustment.

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

1D textures that tint a material per-texel depending on their brightness.

DirectX 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.

Availability

Gamecode for the 2006 branch is included in the now-deprecated Source SDK app. Most 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 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°