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Flash CS5 has updated IK animations to add an effect called Spring. Spring enables you to easily add realistic physics to your animations. Let's take a look at the art on the stage here. I have an IK animation already set up. There is a clock with a pendulum, and the pendulum animates, swinging downward. Now the way Spring works is you define the start state and end state, and then Flash automatically creates the frames that lead between the start and the end state.
For example, Flash will create the animation of the pendulum swinging from right to left and right to left, until it eventually stops in the center. To add Spring to your animation, select the series of frames of your IK animation and then go to the Properties panel. In the Properties panel, make sure the Enable checkbox is checked in the Springs section. Once you enabled Springs, you then apply the Spring to each individual bone. To apply the Spring, select the bone, and then, at the bottom of the Properties panel, change the Spring Strength and Damping.
I'm going to click and drag Strength up to 100. That's the power of the effect of the animation. Then I'm going to drag Damping up to 100 as well. Damping decays the amount of strength over time. So if we had it to zero, the clock would move forever. If we have it at 100, then the animation will end the soonest. So I'm going to click away from the Properties panel to make the animation take effect. We'll preview this animation in the Flash Player. So you can see the pendulum moving from right to left, right to left, eventually stopping in the center.
Of course, a clock doesn't actually work like that. A clock kind of continues its motion, back and forth. So we'll set that using Damping right now. So select that bone again, and then in the Properties panel, bring the Damping down to zero. Again, I'm going to click in the pasteboard to allow the Spring to take effect, and then we'll preview the animation in the Flash Player again. There is the pendulum moving indefinitely. Now obviously, this is a little bit fast for a grandfather clock, but you can fine-tune that using your IK bones.
So you can move around the keyframes and adjust that to customize as you wish. So by applying Springs to your animations, you can add realistic physics with minimal effort.
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