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Source 2006

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The Source 2006 Source 2006 engine branch, also known as the Episode One engine branch, and the last Old Engine branch, was first released in 2005 with Half-Life 2: Lost Coast and Day of Defeat: Source[citation needed] as a tech demo for HDR (High Dynamic Range rendering) and other graphical improvements, then later it was fully released in 2006 with Half-Life 2: Episode One Half-Life 2: Episode One and Half-Life Deathmatch: Source Half-Life Deathmatch: Source, with previous games (Counter-Strike: Source, Half-Life 2, and Half-Life: Source) also upgraded to the Source 2006 engine. It was obsoleted by the 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.

Features

New since Source 2004 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 and Games that uses the Source 2006 branch

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.

Here are the games that currently runs on Source 2006 Source 2006, or previously runs on prior to it being upgraded to newer branches:

Valve

Third-Party