I want to get the rotation of the bone (i.e. elbow) and apply a corrective blendshapes (i.e. jcm_elbow_90) according to it’s rotation.
Make a var into your script:
public Transform elbow;
in the inspector drag and drop your bone to “elbow” variable
In addition to what adi7b9 said, I think you will need to check the rotation of the object in LateUpdate becaue I don’t think the animation will be applied until after Update has already finished.