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Re-using expression-generated values to input into other expressions (read-out)

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Hi there everyone. I was wondering if there is a way to 'capture' expression generated values and either buffer these values or re-using them directly in other expressions. I am trying to track rotations of parented layers, which are generated from the DuDuf IK expressions. Getting the rotation through a pick-whip will always return zero, of course; but as After Effects is able to physically show the expression generated value as a number, I guess it should also be able to output this number somewhere as a (buffered) digital value to be re-used somewhere again.

 

Anyone ideas?


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