For an effect in my game, I want this icon to gradually appear/disappear based on a certain value. And I don't mean opacity by that -- if the icon's a person, for example, his feet would appear, then legs, then torso, and so on. It's not just a plain rectangle, so the usual change width/height trick won't do me any good here.
I know I COULD make a bunch of sprites for each segment of it and toggle their visibility, but that's annoying to do and it won't look nearly as good as what I see in my mind, unless I literally made a sprite for every single line of pixels.
I was thinking one of the effects might be able to do it -- source out, maybe? -- but I barely know how to use them and the past hour of trying has yielded no luck.