Khan Academy: Animating Grass (Video)

In this video [2:08] lesson, we're going to talk about Animation, how to make the blade of grass move. How are we going to animate each blade? Well to animate, we just need to know where each control point is in each frame of the animation. So, we can just record the motion as we move them around. When it's copied out to a bunch of blades of grass, it starts to give you a feeling for how a field of grass might move.