"I have a great affection for Mel. I was really heartbroken to see him go into that," Miller said in a recent interview. "But it's a new time. I hope Mel gets to act in more movies because I think he's a wonderful actor. But I think he's an amazingly good director."
Miller describes "Mad Max: Fury Road" as an extended chase taking place over three days. The movie, due out next summer and also starring Charlize Theron, features minimal dialogue. The screenplay consisted of storyboards -- sketches of each planned shot -- rather than a conventional script.
"You're picking up the characters and the backstory as you go," Miller said. "And in order to create that backstory, we found ourselves having written two other screenplays. One of them is completed. The other one is in the form of a kind of unedited novel. So by the time we got there, we realized we've got a couple more Mad Max stories to tell, and that ... required us to cast someone who was younger."
Miller showed footage from "Mad Max: Fury Road" at the recent Comic-Con International in San Diego. He's still finishing work on the movie, his return to live action after directing the animated "Happy Feet" in 2006 and 2011's sequel.
"Roman Polanski had a saying, which is that there's only one perfect place for the camera at any given time. And I learned that on the animations," Miller said. "You can move the camera wherever you like. But to tell the story -- it was interesting how much you could influence the story by simply shooting from another perspective."
There is, of course, a heightened sense of danger when you're moving said camera through a high-speed motorcycle and dune buggy chase in the harsh Australian outback -- not circling cute dancing penguins via computer software.
"Particularly a film like this where we wanted to shoot like real, old-school," Miller said. "Every car you see smashed is a real car. Every stuntman you see is a real person, and in many cases the cast. ... It's like being in the middle of a real-life video game getting that footage. One, two inches too far one way or the other or a miscue and you've got disaster on your hands. It was both exhilarating and very wearying."
There were only minor injuries during the shoot, Miller said. "Mad Max: Fury Road" will roll into theatres next May.
Follow AP Entertainment Writer Ryan Pearson on Twitter at http://www.twitter.com/ryanwrd