public boolean pointOnSurface(final double x,final double y,final double z){
  return Math.abs(x * x * inverseAb* inverseAb + y * y * inverseAb* inverseAb + z * z * inverseC* inverseC - 1.0) < Vector.MINIMUM_RESOLUTION;
}

public boolean pointOnSurface ( final double x , final double y , final double z ) { return Math . abs ( x * x * inverseAb * inverseAb + y * y * inverseAb * inverseAb + z * z * inverseC * inverseC - 1.0 ) < Vector . MINIMUM_RESOLUTION ; }
check if point is on surface .
