Understanding the Frame Rate in Avatar: Fire and Ash – What Makes Certain Scenes So Smooth?

If you caught Avatar: Fire and Ash in James Cameron’s preferred high frame rate 3D format, you might have noticed that some scenes had an unusually smooth appearance. The Avatar series is known for pushing technological boundaries, and since Avatar: The Way of Water, varying frame rates have become a staple, especially in the underwater sequences.

If you’re intrigued by the ‘smooth’ visuals or want to dive into Cameron’s passionate defense of this approach, you’re in the right spot. We’ll break down the shifting frame rates in simple terms, explaining why certain 3D scenes might appear blurry and why the franchise sometimes opts for a frame rate that deviates from the traditional 24 frames per second.

In Avatar: Fire and Ash, some scenes, particularly those set underwater, run at 48 frames per second (FPS), which is double the standard 24 FPS used in most films. This higher frame rate can create a distinctly smoother look, especially in 3D, which might feel unfamiliar to viewers.

Referred to as High Frame Rate (HFR), 48 FPS can significantly alter a film’s visual presentation, affecting everything from lighting to the overall realism of the imagery. The challenge with the Avatar trilogy is its use of both 48 FPS and 24 FPS, sometimes within the same scene. This can be jarring for viewers, as the human eye perceives frame rates between 30 FPS and 60 FPS, making the transition noticeable and potentially distracting.

So, why has James Cameron chosen to implement HFR? According to him, there’s a narrative purpose behind the fluctuating frame rates.

At the 2022 Busan International Film Festival, Cameron explained his choice of 48 FPS, stating, “We’re using [high frame rate] to improve the 3D where we want a heightened sense of presence, such as underwater or in some of the flying scenes. For shots of just people standing around talking, [high frame rate] works against us because it creates a kind of hyper realism in scenes that are more mundane, more normal. And sometimes we need that cinematic feeling of 24fps.”

Later, before the release of Fire and Ash, Cameron was more direct in addressing critics of the frame rate. “I think $2.3 billion says you might be wrong on that,” he remarked when responding to detractors. “But the argument from artistic is: I happen to like it, and it’s my movie. I like what it does to smooth out the 3D experience.”

Cameron elaborated on the technical aspects, explaining, “We have dedicated neurons for parallax. So when people say they get eye strain watching 3D, it’s not eye strain. It’s brain strain, because we integrate into a stereoscopic perception of the world in our visual cortex. Those parallax-sensitive neurons can’t fire if the vertical edges of things are jumping. The brain can’t process that. So if we’re having a stroboscopic effect that’s degrading the 3D experience, then we’ll use high frame rate. It interpolates to a level that we actually can process 3D and then that brain strain goes away.”

In summary, Avatar: The Way of Water and Avatar: Fire and Ash take a unique approach to frame rates. If you notice scenes that flow smoothly alongside others that seem to stutter, it’s a result of the director’s choice to utilize technology that sets these films apart from the majority. What you’re witnessing is the contrast between 48 FPS and 24 FPS in action. It’s a significant shift, but one that you’ll likely adapt to on future visits to Pandora in Avatar 4 and Avatar 5.