What is the "center" of a Three.js object?
<p>When I use Blender to model an object, I am able to explicitly define its center position from which translations and rotations occur.  When working with Three.js objects, I don't seem to find an equivalent.</p>

<p>Does a Three.js object have a property that defines its "center" position?  If not, how is the the center of the object determined?</p>