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LOS ANGELES: “Avatar” may have been the top-grossing box office hit of all-time, but the public has so far only seen a tiny part of the world introduced in the futuristic epic.

That is revealed by Stephen Lang, who played one of the baddies in director James Cameron´s landmark 2009 movie set on the imaginary world blessed with natural riches Pandora.

The 62-year-old New York-born actor, who plays a similar villain in new thriller “Pioneer” out this week, recounted the adrenaline rush of working on “Avatar,” which has made an estimated $2.8 billion to date.

It is to be followed by three sequels in 2016, 2017 and 2018, each of which has an estimated budget of at least $300 million.

“It is kind of awesome, being part of (a big venture like ´Avatar´) that involves so many different jobs all coming to this world Pandora come together,” he told AFP in an interview.

For the actor, famous from 2011´s “Conan the Barbarian” and the TV series “Law and Order,” one of the challenges of ´Avatar” was spending so much time in front of a green screen, used for computer generated imagery (CGI).

Actors therefore had to use a lot of imagination, in a production planned down to the millimeter.

“We all need to be on the same page, as to where things are, how the weather is” on the fictional planet, in contrast to say “a cold day in Chicago (when) you don´t need to act it.”