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The big use of Shape Keys is also in facial animations and what we have here is some reference video and reference video is essential when you're trying to do face shapes in any kind of animation. It's very helpful to look at some real footage. If you press N here in the UV/Image Editor, you see that this is setup for a movie and we're going to click Auto Refresh here so that every time we change a frame, it changes the frame in the movie. Now, we can come down here and click Play and we can see how the shape of the face changes.
Notice the jaw comes down, and the eyes light up, and the eyebrows move, and there's lots of different motion going on here as she in this case says the letter A. So we're going to press Escape to stop that from playing, and this is also the way you can watch reference video right inside Blender. So then we want to mimic this timing and shape of that word as she's saying that word in here. So we're going to add a Shape Key, going to call it A, and this is the shape that the mouth and the face will take when you say the letter A. So I'm going to go ahead and edit this now to open the jaw, turn off Proportional Editing because I'm doing some pretty fine controls.
Take his lips down and I think you guys get the idea. I don't think you need to listen to me point and click for a-half-an-hour. But Shape Keying can be very tedious and you should know that it takes quite a bit of time to get a realistic but good looking shape of all the different things that are going on, when somebody says a particular letter. Anyway, after you've edited the shape of the mesh to be as you want it, then you lock in that Shape Key, by having it active over here and tabbing out of Edit Mode.
Now, we can see as we slide our slider that he's opening his mouth to say the letter A. That's how you do facial animation in Blender.
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