Because of the nature of Moore's law, anything that an extremely clever graphics programmer can do at one point can be replicated by a merely competent programmer some number of years later.
John CarmackI recognize that I possess a very special intellect, but at the same time, I recognize that I'm lacking in a lot of areas. But being well-rounded is greatly overrated.
John CarmackSharing the code just seems like The Right Thing to Do. It costs us rather little, but it benefits a lot of people in sometimes very significant ways. There are many university research projects, proof of concept publisher demos, and new platform test beds that have leveraged the code. Free software that people value adds wealth to the world.
John Carmack