The formidable Evan Abrams explains IK and FK in After Effects and how LimberiExpressions and Character Tool use them. 

Tools used

Author Notes

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When rigging, there are two methods to consider: forward and inverse kinematics. Commonly called FK and IK, these are the methods you want to know when rigging characters of any kind and shape. We'll talk about what these methods are, how they work, and what you'll want to consider when rigging and animating characters.

 

00:00 - What is all this?

01:38 - Intro to FK

02:07 - Practical FK in Ae

03:06 - +/- of FK

03:45 - Intro to IK

04:36 - Practical IK in Ae

07:07 - +/- of IK

07:34 - Blended Systems

 

If you have any questions just let me know in the comments.

 

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