copy( source, recursive ) {

		super.copy( source, recursive );

		this.element = source.element.cloneNode( true );

		this.center = source.center;

		return this;

	}
The 3D objects center point.
`( 0, 0 )` is the lower left, `( 1, 1 )` is the top right.

@type {Vector2}
@default (0.5,0.5)