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In this chapter, we are going to continue take things up a notch by talking about some more advanced principles of animation and specifically in this chapter, we are going to use a big word, quite often, and that word is interpolation. That sounds very scary, but it's actually not. Interpolation is the way that After Effects gets from one point to the next. So, we have his top arrow here and if we select it and press U, the only keyframe that show are these two position keyframes. It starts here and it ends there. And so far all we have talked about is the straightforward linear interpolation that After Effects comes with right out the box.
We start with one keyframe. We go to the next keyframe in the most straightforward way possible. And I want to show you another layer here, the bottom arrow. Now notice here with this layer, when we press U and we show the keyframes, there are only two keyframes here and it does the same thing. It starts in the same place and it ends in the same place. But the way that it gets there is much different than the way the green arrow gets there, and yet they both only have two keyframes. So, again, interpolation is the way that After Effects goes from one keyframe to the next keyframe.
If there were such things as keyframes in real life, you might set a keyframe to be in Los Angeles on Monday, and New York on Saturday. And so those are two keyframes, but you might fly there and you might take several layovers to get there, and so the path that you take to get from point A to point B would be the interpolation. Now there is two different types of interpolation. There is spatial interpolation and temporal interpolation, temporal referring to time. We are going to talk about temporal interpolation a little bit later on in this chapter.
First, I want to look at spatial interpolation. In other words, we are to go from point A to point B, but we are going to move this guy around little bit before it gets there. So, spatial interpolation refers to moving the object around as it goes from point A to point B. So, we will look at how to create a motion path and actually what I did to create this arrow here. We'll look at how to do that in the next movie.
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