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| | IGN: GDC 2004: Half-Life 2 Source Engine Demo |
 | | The demonstration was split into several parts, highlighting the renderer, physics, AI, character expression/emotion, sound and multiplayer features of the Source engine, as well as highlighting some of the built-in world creation tools available to developers. |
 | | We saw the vehicle demo in motion again as well, and learned that such properties as tire friction and material, spring tension, gearing and shift speed were all tweakable in the engine, and how all affect the physics of a given vehicle. |
 | | He also mentioned that, using the Source engine, enemies can detect you based on sight, sound or smell, and showed the Antlion demo where Gordon is using the pheromone grenades to control a group of aliens against emplaced turrets. |
| pc.ign.com /articles/501/501650p1.html (729 words) |
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