question: public static Vector3D max ( Vector3D a , Vector3D b ) { return new Vector3D ( FastMath . max ( a . getX ( ) , b . getX ( ) ) , FastMath . max ( a . getY ( ) , b . getY ( ) ) , FastMath . max ( a . getZ ( ) , b . getZ ( ) ) ) ; }
target:  Calculates maximum of each coordinate.