What is the Additive Reference Pose checkbox for?

Questions & Answers
1

I have read the documentation and tried this setting out by myself, but it’s still unclear to me exactly what this setting is supposed to do. What is this used for exactly?

85332-additive.png

2

Does this help clarify Additive Reference Pose?

https://forum.unity3d.com/threads/mecanim-additive-animations.226300/?_ga=1.98704798.1497465335.1471225865

Additional info on Additive Reference Pose update in 5.3 :
Mecanim: Additive Layer improvement. You can now specify the reference pose for your additive animation clip. The additive reference pose can be define in either the model importer when you import your clip or with a new API function AnimationUtility.SetAdditiveReferencePose()

And
https://forum.unity3d.com/threads/additive-reference-pose.443557/