I was responsible for creating vista environment (Mt Doom and environment outside of the play space) and clouds.
Gorgoroth was fun to work on, especially the volcano smoke.
Lighting and sky was done by lighting team.
I pass on my environment to the lighting team, then lighting team bakes the lighting onto my environment.
Once I get all the surroundings I start adding clouds for all (or as much as I can) overload scenarios until I lose my mind :D haha