Mels VFX added eye effects to Apocalypse, evident when the mutant overlord is wielding his powers. The eyes are like white cataracts, said Mels visual effects supervisor Jonathan Piché-Delorme. We tracked the shots in stereo , then did a concept of the eye effect, which we rendered in Arnold.
Due to the refraction of the cornea, our main challenge was to match the exact position of the pupils. To achieve that, our matchmoving team tracked with a realtime preview of the eyes to make sure that everything fits perfectly.
Mels also performed a number of cosmetic fixes throughout the film, on costumes, makeup and backgrounds.