I've done a fair amount of that stuff... when we did 'Lord of the Rings' the transformation sequence from Smeagol to Gollum was a 19-hour make-up job. You have to have a kind of zen button that you press and allow the mind to be focused in a certain way.

Animators do amazing working translating and interpolating the characters [in the Planet of the apes], the facial performances. What we're creating on set - if you don't get it on the day, in the moment, on set, in front of the camera, with the director and the actors. The emotional content of the scene and the acting choices.

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.

My take is that acting is acting. A performance is a performance. With performance capture, if you don't get the performance on the day, you can't enhance the performance.

What I'm saying is people like Hoodwink are not kind of evil villains, they're part of humanity. We can choose to disassociate ourselves from them and we can choose to pretend they're not there, but they are. We're all together in this.

You don't go - oh this is a motion capture role, I'm going to employ this method of acting. We don't have anything to hide behind when we're doing this.

I play saxophone, I play tenor sax.