One of our recent graduates ended up working in just this field. Actually, he wasn’t even a math major: he was a theater major who picked up a math minor in his last two years. He’s now doing graphics programming, and it requires a ton of math: he mentioned that the most important course turned out to be Linear Algebra. In all fairness, since he’s officially a software engineer I have to assume he had some computer science as well. But we don’t even offer a computer science degree, and he started work in this right out of college, so I don’ t know how much formal computer science training he had.
The article Math in the Movies from 2007 gives similar information. There’s a 90-second video there, which I can’t seem to reproduce here, but in part of it the announcer Cindy Demus(?) says:
Trigonometry helps rotate and move characters, while algebra creates the special effects that make images shine and sparkle. Calculus helps light up a scene and new math techniques turn images like this [flat and blocky] into this [smooth and more realistic].
Then Tony DeRose, a computer scientist from Pixar Animation Studios, added
I remember as a mathematics student thinking, “Well, where am I ever going to use simultaneous equations?” And I find myself using them every day, all the time now.”
So with some sort of computer background and good math skills, that job could be yours as well.