addChild(bounds)
    {
        if (bounds._empty) return this;

        if (this._empty)
        {
            this.copy(bounds);
            this._empty = false;
        }
        else
        {
            this.union(bounds);
        }

        return this;
    }
/**
     * Adds the child bounds object to the size of this bounding box.
     *
     * @param {BoundingBox} bounds - The child bounds to include.
     * @return {BoundingBox} Returns itself.
     */
Adds the child bounds object to the size of this bounding box.
@param {BoundingBox} bounds - The child bounds to include.
@return {BoundingBox} Returns itself.
Adds the child bounds object to the size of this bounding box . @param { BoundingBox } bounds - The child bounds to include . @return { BoundingBox } Returns itself .
addChild(bounds)
    {
        if (bounds._empty) return this;
        if (this._empty)
        {
            this.copy(bounds);
            this._empty = false;
        }
        else
        {
            this.union(bounds);
        }
        return this;
    }
addChild ( bounds ) { if ( bounds . _empty ) return this ; if ( this . _empty ) { this . copy ( bounds ) ; this . _empty = false ; } else { this . union ( bounds ) ; } return this ; }
Adds the child bounds object to the size of this bounding box.
Adds the child bounds object to the size of this bounding box .