James Cameron‘s long-awaited 3D scifi fantasy flick Avatar had its world premiere Wednesday night in Hollywood and, as you may have seen from our live-tweets, AMC News was there. This is a movie that Cameron, of Aliens, Terminator, True Lies and Titanic fame, first brought to producing partner Jon Landau in 1995, but shelved until 2005 as they waited for technology to catch up. What does the new 3D technology add to the movie? How important was it to get the story right despite all of the epic visuals? I asked Cameron, Landau, and stars Sigourney Weaver, Sam Worthington and Zoe Saldana in my Opening Night report.