Sweet sweet, rendering the HDRI equirectangular map of the environment model was top notch thinking. I’m starting to guess it’s like this in every production ever, figuring out tricks for over coming limitations and cutting corners here and there.
Seeing the GIF helped in understanding what you did with the floor, I can see it comes with the tractor cycles render with alpha on the edges. And I’m guessing everything is in the same scene, meaning blender file, for the camera work to match.
I’m thinking, how would the group workflow been achieved for shading if everyone was working on their part? it seems impossible for everyone to keep the same material being left on their own. But then again, how do they do that in a production then? I guess there are heads of shading that make all the decisions and everyone adheres to them? Well no matter, that’s a job for detective pikachu.