Hello Oliver,
Pavel has already answered to you by email, but I'm copying his answer here for the history and other forum members:
Quote:
Skeleton structure is shown
here.
The root joint (one that has no parent) is
Hip.
It has 3 child joints -
LowerSpine,
LThigh and
RThigh.
Chest also has 3 child joints -
Neck,
LClavicle and
RClavicle.
So you can traverse from root joint (
Hip) to end joints that have no children.
and
Quote:
RClavicle is the parent for RShoulder.
So if you select the "Relative to Parent" / Euler Angles coordinate system, you get Euler Angles for RShoulder rotation relative to RClavicle.