It seems to be the same issue in these threads.

    CGTalk - how to "zero to parent"

    CGTalk - roll / pan / tilt of camera

So any item you would want to animate  by it's local axis (or to refer to it's local transforms in expressions) needs an intermediate parent item? 

Doesn't that make sub-sub level items become  sub-sub-sub-sub level? (double the items at double depth?)

What happens when you reset the transforms of a child of a parent that's somewhere in space, pointing somewhere?  
 (0 zeroing it's transforms) 
the item snaps to world center?  and not to whatever position/orientation of it's parent?

On 09/11/17 11:01, Morten Bartholdy wrote:
Thanks guys - there is plenty to investigate here :)

//MB

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