Avatar is James Cameron's first feature film since 1997's Titanic
Director James Cameron has unveiled the first glimpse of his highly anticipated new 3D film Avatar at the Cinema Expo in Amsterdam.
Film industry workers were treated to 24 minutes of footage from the movie about a battle on a distant planet.
Despite a media ban reporting on the clips shown, people at the event posted anonymously online that the footage was "jaw-dropping" and "stunning".
Avatar is released in cinemas in the UK and US on 18 December.
Speaking at the event, James Cameron said: "Three years ago, I stood up here and said the 3D renaissance is coming and from what we've seen in the business, we can now say it has arrived."
In introducing the footage, Cameron said much of it came from the first third of the film but that there were also glimpses from unfinished portions of later battle scenes involving warring sides clashing over control of the fantasy world Pandora.
Cast members including Sigourney Weaver, Terminator Salvation's Sam Worthington, and Star Trek's Zoe Saldana were also present to talk about their characters in the film.
Industry newspaper Hollywood Reporter, which was one of only two media outlets in attendance, reported that the clips were met by a standing ovation.
One Twitter user, who was also at the event wrote: "This will change movies forever," while another said: "Footage from Avatar was stunning, literally jaw-dropping. Amazing visuals unlike any before seen, with incredible detail."
An anonymous industry insider told movie website IESB.net: "It makes me want to create a time machine like Cartman from South Park, so that I don't have to wait until 18 December to watch the finished movie.
"If it's anything like the scenes I saw, it's going to be one of the best movies of the decade."
Filmed using a mix of CGI, motion-capture animation and live action, Avatar is Cameron's first feature film project since 1997's Titanic.
It has reportedly cost $300m (£181m) to make.