Earlier quoted context omitted.
Not sure if you picked up your own slight mistake earlier, but this is also exactly why you shouldn't try and 'tween' the planes to the new positions if you're aiming for realism.
Huh? What I'm proposing if you want to make it realistic (which may or may not be good UI) is: * Everything fades from when it was drawn * Everything is only drawn with the sweep * Simulate a continuous motion for the planes, and use that to determine a new position at each sweep. Did I make a mistake?
I thought you were saying to animate the planes, but I no longer think that's what you meant.