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.

Commercials are also any opportunity to meet new crew and work with new kind of rigs. You can explore working with different people without having to make the full commitment of having to do an entire feature film with them and see whether you like them. Also it's great for testing out new equipment, like on the last spot we just did, I used a lot of drone technology, really cutting edge drone stuff, more than I've ever done before, and it worked out really really well.

I went for a more classical approach to filmmaking with lots of dolly, track and cranes, and slightly slower, more choreographed fight moves, so you get more fight moves in one take.

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.

I was excited about the fourth movie I guess conceptually because, what I felt we should do it, we should try to make it a conceptual jump like Terminator did to T2. It was still the Terminator franchise, but it was something kind of bigger and grander.

My approach has always been to put 100% into the movie I'm making right now. I think sometimes filmmakers put too much thought into the grand franchise they're going to build. And guess what? If the first movie doesn't work there is no franchise, so I'm always concentrated on making the best, best possible movie right now.