> scene specific lighting hacks, things that make no physical sense but result in the visual appearance they are after. The flip side of this is that physicall

> scene specific lighting hacks, things that make no physical sense but result in the visual appearance they are after. The flip side of this is that physically realistic shadows aren't always what you want. Any amateur photographer who has noticed just how awful hard shadows are on faces on clear sunny days has learned this lesson the hard way. To quote a graphics professor of mine (tongue in cheek), "Physically accurate rendering is a crutch for people who aren't smart enough to cheat their way to the look they want".