Sam Worthington loved stripping off for his role in 'Avatar'.

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.

He said: "I was thinking if this is how you make a big budget movie, then I'm mad enough to be a part of it.

"I would do that most times, doesn't matter if James Cameron wants me to do it. I do it most times. He had to struggle to put clothes on me today!"

The 33-year-old star also credited Cameron - who directed 1997 blockbuster 'Titanic' - for changing his life and career forever.

He said: "Before I met Jim I was sleeping in my car. He's plucked me from obscurity. He changed my life, so to speak."