In FaceOff Paintball you can use your head movements to duck in and out of cover, whilst you pick off the other paintballers. It features a head-driven handy-cam effect to make you feel more immersed in the game and an online leaderboard that updates in-game as you play. The tracking works using a conventional web camera, so there's no need to go and buy any specialised equipment. FaceOff Paintball can be freely downloaded today from:

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RSS Report Head tracking in Half-Life 2 (FaceOff Paintball v2

I love playing with Head Tracking, it's something like Kinect only for Head, but it's free and it works with every webcam, thanks.
Why you can see throught weapon at 0:17?...

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Because when valve made those models to save on polys they did not make the other half of the weapons as you would not see it, however this mod allows you too see it.

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FaceOff Paintball allows you to lean around corners in the virtual world by simply tilting one's head. The game features a responsive shaky-cam effect to make the player feel more immersed. In this second version of FaceOff Paintball, you now can try this head-tracking technique with levels from Half-Life 2 and Episodes 1 and 2.

To achieve the head tracking, FaceOff incorporates Seeing Machines' FaceAPI (v4, yet to be officially released). This allows the tracking to be accomplished without any markers or configuration, using only a simple web-camera.

The only requirement of the system is that you own a Source SDK title. Such titles include: Portal, Left 4 Dead, Half-Life 2, Team Fortress 2, Day of Defeat: Source, Garry's Mod and Counter-Strike: Source. Unfortunately, Source titles obtained through one of Valve's hardware promotions do not count, as they do not include the Source SDK.

Creative commons featured in the video:

Image of the crowbar by user AMagill. Image available at:

Music "Ode to Charles" by user Professor Kliq. Song available at:

This video is provided under a Creative Commons Attribution-ShareAlike 3.0 licence ( Please contact me if you would like a copy.