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The Australian actor - who stars as a blue alien called Jake Sully in 'Avatar', the 3-D animated film by director James Cameron - insists he didn't solely rely on technology for the role.
He said: "I had nothing on. I had a loincloth on and they painted me blue, basically".
Speaking on Thursday night (17.12.09) at the Los Angeles premiere of the film, Sam - who was relatively unknown before being offered the role in 'Avatar' - admitted he welcomed the body-baring challenge.