The way it works in commercials is they come to you with the script and then you do the visual, you do the storyboards, and you give your vision of it, but it's very much their baby. You just kind of put your polish and sheen on it, and you're interpretation of it, but it's very much the agency's idea.

It's a very different experience shooting in 3-D because the camera rigs are so large. Everything we've become accustomed to in the last ten years as filmmakers, which is cameras getting smaller and smaller and you can just throw them on your shoulder and stick them in a car and do whatever you want, you can't do any of that now. You're forced to put things on dollies and track and cranes.

3D is very exciting. I love it. I'm a complete convert. Everything for me, from now on, is 3D. I'm completely convinced it's the future of home entertainment, as well as cinema entertainment. I think it's a paradigm shift, in terms of cinema, and those things don't happen very often. The introduction of sound, the introduction of color photography and now 3D have been the big shifts. They happen once every 40 or 50 years, so it's very exciting to be a filmmaker, working while one of them is happening.

I like alternating commercials with movies, because it keeps the pace up. You can't slack on a commercial. You need to go fast. That's a terrific piece of action, I think if that was scheduled for a movie, you'd put that in for two or three days worth of work.

When we wrapped Resident Evil, we were a 3D movie, but it was no big deal. And then, Avatar came out and the whole of Hollywood was like, "Look at these grosses! 3D is huge. Let's all be 3D!" We just got on with doing what we were doing, which was making what we think is a really quality, kick-ass 3D movie, and we'll really be the first live-action 3D movie of the year.

I really believe in 3-D. I really think it is the wave of the future for cinema.

The cameras were a little twitchy, and you'd get less footage and less set-ups every day. The interesting thing about it was that you just composed images in a completely different way because we had big 3D monitors on set, and you'd wear the glasses and see the image in 3D.