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The bottom bone here is affected by an IK chain:

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Unfortunately, it's rotational value doesn't change unless I rotate the bone directly.

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This is a problem, because I want to use it's rotational value to drive a shape key. The shape key would, if the bone is rotated, flare out the bottom part of the cylinder.

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What can I do?

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1 Answer 1

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You can get the transforms of a bone after the actions of constraints by using a "transform channel" type variable in your driver:

enter image description here

Driving from a "single property" type variable won't get the post-constraint transform, just the raw f-curve values.

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