3D's been one of the main talking points in the industry this year alongside motion controls.
One of the big advocates of the tech is Sony, who have been showing some of its games in 3D on the show-floor here this week at gamescom, like Killzone 3 and Gran Turismo 5, just to name a few.
Needless to say, 3D's big news right now, like it or not. Even if most people can't afford the 3D-enabled TV for it.
We're going to be speaking to Sony's boss of 3D, Mick Hocking, in Cologne later this afternoon, and we want your questions on the subject.
We'll select the best questions for this later on before the interview at 4:15pm CET (3:15pm BST).
Get thinking, kids.