Taking in $48.5 million over the weekend at the North American box office, James Cameron's 'Avatar' has become the first major motion-picture release in film history to be driven almost entirely by 3-D ticket sales.

Indeed, in the U.S. and Canada this weekend, 80 percent of theatrical revenue for the film came from 3-D ticket sales. And, according to estimates from Fox, a staggering $340 million of the film's $429 million domestic tally has come from 3-D engagements.