[General Question] How do they animate the tear on the eyes in cinematic trailers?

Worldevour

Like the cinematics from "Blur" or "Blizzard. 
Do they stick it with deformers on the skin? Also I would like to know if they make the eyeball complete sphere? I know in game characters they do.

oglu

That depends on the budget they get for the cinematic. If there is enough money they use special solver. 

Maxime added such solver in his latest compound pack.
At 2min 44sec

https://youtu.be/QNjnY4fFc4s

Worldevour

Helpful as always! Thx!