James Cameron is reportedly working on technology that may enable viewers to watch the Avatar sequels in 3D without 3D glasses.

According to Inside the Magic, James Cameron's company Lightstorm Entertainment has renewed a five-year collaboration with Christie Digital to "create high-tech, immersive cinema".

Part of the agreement involves Christie supplying an RGB projection system to Cameron for the Avatar sequels. RGB laser projection provides bright images at a higher frame rate, which gives filmmakers the ability to "push the boundaries of 3D films".

Cameron has previously expressed his desire to create 3D films that can be viewed without 3D glasses - he told IndieWire in 2016 that he's "still very bullish on 3D".

"But we need brighter projection, and ultimately I think it can happen - with no glasses. We'll get there," he said.

Kiwi actor Cliff Curtis has been cast as the lead character in all four of the upcoming films. The actor will play Tonowari, the leader of the Metkayina, the reef people clan.

Zoe Saldana, Sam Worthington and Sigourney Weaver are all reprising their roles from the 2009 film. Production will begin at Wellington's Stone Street Studios next year.