for graphics i think the only time you would need it is when you want things to follow a mathematical curve for prettyness

or if you were part of the development team that makes the game engine

or like gster said, if you were doing the AI... although in my experience i haven't at all had to use any of my math and philosophy in AI... other than in bayesian learning... but that was applied math sort of stuff and non-math stuff like probability :eek3: