i suppose that if Q4 source eventually goes out, it will be crippled.This fully realtime approach used in Doom 3, combined with the use of shadow volumes permitted more realistic lighting and shadows than in the previous generation of id's engines. The method used to create the shadow volumes is the subject of a patent by Creative, which Creative granted id permission to use in the Doom 3 engine, in exchange for supporting Creative's EAX advanced sound technologies
http://en.wikipedia.org/wiki/Id_Tech_4
http://arstechnica.com/old/content/2004/07/4048.ars


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