Book cover of BIlly Lynn's Long Halftime Walk. [Photo/Mtime]

Footage of Ang Lee's new 3D film Billy Lynn's Long Halftime Walk has been screened at The Future of Cinema Conference in Las Vegas.

The film is based on the namesake novel published in 2012.

It's the story of an American soldier who recounts his final hours before he and his fellow soldiers return to Iraq.

The sequence screened in Las Vegas includes clips showing battles in the Iraq War to the celebration of soldiers at an NFL game.

The film itself stars Kristen Stewart, Vin Diesel, Steve Martin, Chris Rock and a host of others.

Billy Lynn's Long Halftime Walk is due to be released on Remembrance Day, November 11.