public boolean isUnitBox(){
  return this.center.x == 0 && this.center.y == 0 && this.center.z == 0 && this.radius == Math.sqrt(3);
}

public boolean isUnitBox ( ) { return this . center . x == 0 && this . center . y == 0 && this . center . z == 0 && this . radius == Math . sqrt ( 3 ) ; }
indicates whether this bounding box is a unit box centered at the cartesian origin ( 0 , 0 , 0 ) .
