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Adobe After Effects CS3 Tutorials

Advanced Animation / Motion Sketching




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Motion sketch is a helper that will follow the motions of your mouse and then add keyframes for you automatically. What I want to do here with motion sketch is take this leaf and then have it go like this in this little forest background. And these are pieces of clip art that I have in my collection here. So feel free to use anything to follow along with, even a ball that you draw with the shape tools. So whatever you want to do, follow along, feel free to use that. I'm going to use what I have here and what I want to show you, let me twirl these up a little bit I'm going to hide, or rather lock this background layer because I don't want to accidentally hit that while I'm trying to animate, so I'm going to lock this layer and make sure I'm on my leaf layer. What I want to do now is go to window and I want to choose motion sketch. Motion sketch has some options available to you such as the capture speed, which pretty much indicates how fast or slow the capture will occur as you move your mouse. You'll notice something also cool here; smoother is built-in. So we have the smoother. What you can do with smoothing here is have it try to make the animation, of course, smoother and eliminate some of the keyframes that will give you a more jaggedy feel and if you're using your hand, and my hand, by the way, is very shaky when I draw, so the smoother is very handy for me when I incorporate this. But for now I'll leave it at one. We can also have the wire frame of our object show, as well as the background when we capture this. I'm going to turn these off and show you what happens when I don't have them on. And I'll click start capture and then I'll click on my leaf and all I see is my mouse cursor. That is not going to give me the feedback I need to create my animation. And also, because my smoothing is set to one, look how many keyframes have been generated. That's going to give me a very jaggedy animation. So I'm going to preview that. I'll go ahead and hit the space bar and it's a little too jaggedy for me. I don't want the leave to do that. I want it more smooth, so I'm going to undo all of that. This time I'm going to turn wire frame and background on and I'll increase my smoothing to 25. Now, when I start my capture, I'm going to see a box wire frame which will be my leaf, as well as this background. I'll hit start capture and I'll click and now I get this nice, smooth animation like so. And I only have a few keyframes to show for it. This time I'll hit space bar and you get this really, nice animation of this leaf falling. So as you can see, motion sketch is a tool that I think you'll incorporate, especially when you want to do things like bounce a ball or have somebody sky diving or parachuting or anything that's going to require some kind of smooth motion that doesn't look computer-generated but it looks like you had a little bit to do with it with the motion of your mouse.

Tutorial Information

Course: Adobe After Effects CS3
Author: Dwayne Ferguson
SKU: 33843
ISBN: 1-934743-46-1
Release Date: 2008-01-14
Duration: 7 hrs / 125 lessons
Work Files: Yes
Captions: Available on CD and Online University
Compatibility: Vista/XP/2000, OS X, Linux
QuickTime 7, Flash 8

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