In 'Tintin,' it's like a live-action role. You're living and breathing and making decisions for that character from page 1 to page 120, the whole emotional arc. In an animated movie, it's a committee decision. There are 50 people creating that character. You're responsible for a small part.

I am a bit evangelical, I know, but performance-capture is still misunderstood.

I do listen to myself sometimes and think, 'Is my moral compass so easily swayed by the characters I play, or is it me growing as a human being?'

I suppose the biggest strain was that Hoodwink is a high-octane character and he's up there like all the time. Once he's on his journey there's no let up for the man, so I actually found it a massively exhausting job to keep that level up.

I'm in the early stages of a film called 'Freezing Time' about Eadweard Muybridge, the Victorian photographer who was really the forefather of cinema. Digital animators still treat his images like the Bible. He was a very obsessed man.

Caesar [from the Rise of the Planet of the Apes] was brought up with human beings and because of the drug he had pretty much grown up with his whole life, he felt like an outsider, he felt trapped in an ape's body but he didn't really feel like an ape and that was my way into the character. So he's always had this duality playing him from an infant all the way to now as a fifty-five year old ape.

Not a day goes by where I'm not reminded of Gollum by some person in the street who asks me to do his voice or wants to talk to me about him. But because 'The Hobbit' has been talked about as a project for many years, I knew that at some point I'd have to reengage with him.