Unity3d of $ four quaternion

----Pivot point--Pivot point

The transformation Center, or pivot point, is the part where rotation or proportional deformation occurs.
All objects have a pivot point. You can imagine a pivot point as a representation of the local center or local coordinate system of an object.
The pivot point of an object is used for several purposes:
• When the pivot Point Transformation Center is selected, as the center of the rotation and scale transformation.
• Set the default location for the modifier center.
• Define the transformation origin of the linked sub-object.
• Define where IK is combined.
By using the pivot feature in the Hierarchy command panel, you can display and adjust the position and orientation of the pivot point of an object at any time, adjusting the pivot point of an object without affecting any of its linked sub-objects.

Pivot: Refers to the axis, generally more inclined to the concept of rotation!
Center: Refers to the central, more inclined to the concept of position!

Center: Change the pivot point of the game object to the centre of the object bounding box;
Pivot: Use the axis of the object itself

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Http://www.cnblogs.com/88999660/archive/2013/04/02/2995074.html

Unity3d of $ four quaternion