I'd almost be willing to lay down money that Carmack DIDN'T do the primary coding (or design) for Megatexture(TM). He's most likely at work on "THE NEXT BUG THING" at id. He's usually not very involved in outside joint-venture projects like this, anyway (historically speaking). There are other talented coders at id like…
Gauss, its not nonsensical. Its a texture and it is mega, I fail to see how you miss the logic. The future plan is to make some optimazations so it can be renamed a TURBOMEGATEXTURE but these optimations may come in two stages to enable it to be eventually called a HYPERTURBOMEGATEXTURE.