How do I compute the local rotation of a bone at the beginning of an IK chain (ie., the first bone in the bone chain)?
I thought I could try duplicating the bone to create a static “basis” bone, and compare their matrices using
bpy.context.object.pose.bones['Bone'].matrix
or compare their world space(?) vectors using
bpy.context.object.pose.bones['Bone'].vector
But once the IK constraint is enabled, the matrix of the original bone on the IK chain is changed, and it no longer matches the duplicated bone’s matrix.
What’s an effective way of doing this?