James Cameron is flanked by towering trees and lush, dreamlike vistas. No, the “Avatar” director isn’t dialing in from Pandora, he assures Robert Rodriguez. It’s just a screen saver, meant to enliven whatever drab editing bay he’s in, putting the final touches, this November afternoon, on “Avatar: The Way of Water,” his long-gestating sequel to the 2009 blockbuster that introduced the world to the way of the Na’vi. The two men are old friends — having worked together on the sci-fi adventure “Alita: Battle Angel,” which Rodriguez directed and Cameron produced — and clearly have a lot of respect for one another. Variety Directors on Directors presented by MGM Studios and United Artists Releasing Watch every Directors on Directors episode: https://www.youtube.com/playlist?list=PLLx_Nt-I7ViqK8k-H33Jr12lumPc8xl2- http://bit.ly/VarietySubscribe http://www.facebook.com/variety http://www.instagram.com/variety http://www.twitter.com/variety