
Is something that was first used in a motion picture for the adaptation of Polar Express (to my knowledge). Not sure if that made it across the pond or not. Now Beowulf, which I saw today, did have sections that looked like they were designed for use in a 3D theater complete with glasses, but it was not required. I actually didn't quite catch that until a friend pointed it out.
The only issue thus far with this "performance-capture imagery" is that it's close enough to looking real that you can tell it is not. It's kind of an odd feeling, and I think they haven't gotten the facial expression part down pat, yet. Much, to my perception, is based on the lighting and action. There were parts that you forgot you were watching animation, and just assumed it to be real actors. The arguement for it, that I see, is that it allows the director to keep that fantastic, whimsical feeling, without having the mix live action and CGI. The continuity is better, so that both Beowulf and Grendel look to be in the same plane of existence, for lack of a better description.
BTW, Sweeney Todd looks great, so it will be fun to see that one when it comes out at Christmas (in the States). Odd timing, I'd have to say, but it is Tim Burton.