3D is a technique on which filmmakers and audiences alike are divided, but Cameron’s Avatar films are widely held up as examples of the technology done well. Avatar 3: Fire and Ash is due out in December, and Cameron hopes to film Ghosts of Hiroshima before the fourth instalment in the series is released in 2029. “If I do my job perfectly [on Ghosts], everybody will walk out of the theatre [in horror] after the first 20 minutes,” Cameron told Rolling Stone. “So that’s not the job. The task is to tell it in a way that’s heartfelt, in a...