Veteran Valve developer Gray Horsfield recently left the company. The pioneer of Valve's Cinematic Physics system and L4D2's zombie gibbing system, he had done work on HL2:EP2, Portal 1 and 2, and the L4D series. This past January, he posted up this video, showing a test demo for a dynamic swarm system, set inside a strange map bearing eerie similarities and parallels to Valve's Half-Life series. Article: Also, RIP Gothic's Grandma.
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