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Chapter 17. Rigging Characters for Anima... > Advanced Stretchy IK Legs and Classi...

Advanced Stretchy IK Legs and Classic Reverse Foot

The Jerk's legs will be rigged up in a similar way to the spine: They will be capable of stretching when the distance between the foot and the hips becomes larger. This is an interesting setup because it causes the foot to stay stuck to the ground, even if the character's root is causing the leg to stretch just a small amount. This capability allows for the animator to hit nice key poses in a walk, or any other pose that involves planting one foot and moving another, without having to worry too much about the terrible “IK snapping” of joints as the IK handle moves too far away from the joint and it can no longer bend to achieve the pose.

In the next exercise, you set up the leg joints so that they will stretch and the animator will never have to worry about this problem.


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