SetParent vs Atacch. Is Bug?

[Yue]

I am trying to put the case of my character having as reference the spindle of the nape of the neck, but it turns out that when he is falling into the void after a jump the case starts to float above his head, this using attach.

 

Now, if I use SetParent, to attach it to the mesh, whose root bone is in the middle of the legs, when falling the helmet does not move from its position.

 

 

In such a case I need to position it in the head, in the Neck bone, and I have found a partial solution. 

    function this:UpdateHelmet()

       

        helmet:SetPosition(0,0.12,-0.03)

        helmet:SetRotation(-20,0,0)

        helmet:Attach(ela,boneNeck)

       

    end

 

... self:UpdateHelmet() -- Run Ok.