Originally when I went off to work on 'The Lord of The Rings' I got a call from my agent saying that I was just going to do a voice. But I couldn't really approach it like that. To get Gollum's voice I had to play the character.

It's a really unique situation where you just - you make independent films or you make big blockbuster movies, but it's very rare when all of those ingredients come together, and you can really tell a story that you care about with a character you absolutely love with the people you love making movies with.

The learning curve is 'The Hobbit' is being shot in 3D.

Performance capture is a tool that young actors will need in the next 10, 20 years. It's on the increase, as you say. It's not going away.

What you can do with visual effects is enhance the look of the character, but the actual integrity of the emotional performance and the way the character's facial expressions work, that is what is going to be created on the day with other actors and the director.

The difference between the big budget films I've done is the length of time. But in terms of the day-to-day, you're still going on to set, you're getting into character, and you're going and doing your job, so there's absolutely no difference. It's just the structure around it and the length of time. But in terms of budget and money, it doesn't really manifest itself.

When I played Gollum in 'Lord of the Rings,' if I was climbing up the side of a mountain, which I physically did, you know, I was on every single occasion swimming through streams, all of that, that wasn't captured. That was filmed on 35 millimeter, and for certain of those shots, it was rotoscoped and painted over.