Is it possible to access bone rotation while animation is playing?

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.