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If you've spent a lot of time working with IK Armatures in Flash, you may have wanted a feature that would allow you to just lock a bone in place so you can edit child bones without the parent bone moving. Now is the time to rejoice, because that feature has been added to Flash CS5.5 and is called IK Pinning. Let's take a look at this animation that I have. I've a IK animation of a bear walking across the screen. Let's take a look at how we can edit it using the IK Pinning feature.
So I'll double-click the bear, and then I am going to select one of its legs; how about the back leg here, and we'll see that it's an IK Armature animation. So I'll zoom in and take a look at how IK Pinning works. So I have my armature here, and let's say I wanted to move the bottom part of the leg and just keep this bone in the same spot. So I can select this bone and using the IK Pinning feature I can go in the Properties panel and simply check the Pin check box.
Now when I grab the bear's foot and move it around, the rest of the bone structure doesn't move. So I can repose, if I want, without having to worry about that. I can scrub the playhead to preview the animation. And that's it. It's all there is to it. Simply select the bone, check or uncheck the Pin option in the Properties panel, and it locks the bone in place.
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