The documentation Disney posted about the data set has an explanation: https://www.disneyanimation.com/technology/datasets https://www.disneyanimation.com/techn

The documentation Disney posted about the data set has an explanation: https://www.disneyanimation.com/technology/datasets https://www.disneyanimation.com/technology/datasets Basically they have a few different techniques that couldn't be directly translated into PBRT, like lights that only hit certain objects, so the lighting is not as good in the PBRT renders, along with a few other things. Nothing super advanced, just some things that were added to their renderer for artistic control reasons that PBRT doesn't have.