VFX heavy feature for a Disney subsidiary. Each frame is rendered independently of each other - it’s not like video encoding where each frame depends on the previous one, they all have their own scene assembly that can be sent to a server to parallelize rendering. With enough compute, the entire film can be rendered in a few days. (It’s a little more complicated than that but works to a first order approximation)
I don’t remember how long the final rendering took but it was nearly two months and the final compute budget was 7 or 8 figures. I think we had close to 100k cores running at peak from three different render farms during crunch time, but don’t take my word for it I wasn’t producing the picture.
There's plenty of GPU renderers but they face the same challenge as large language models: GPU memory is much more expensive and limited that CPU memory.
A friend recently told me about a complex scene (I think it was a Marvel or Star Wars flick) where they had so much going on in the scene with smoke, fire, and other special effects that they had to wait for a specialized server with 2TB of RAM to be assembled. They only had one such machine so by the time the rest of the movie was done rendering, that one scene still had a month to go.
I'm not sure how well suited GPUs are to the workload. They're also rather memory constrained. The Moana dataset is from 2016 so it's not exactly cutting edge but good luck loading it into vram.
Most VFX productions take over 2 CPU hours a frame for final video, and have for a very long time. It takes shorter then a month since this gets parallelized on large render farms.
