static double computeDesiredEllipsoidMagnitude(final PlanetModel planetModel,final double x,final double y,final double z){
  return 1.0 / Math.sqrt(x * x * planetModel.inverseAbSquared + y * y * planetModel.inverseAbSquared + z * z * planetModel.inverseCSquared);
}

static double computeDesiredEllipsoidMagnitude ( final PlanetModel planetModel , final double x , final double y , final double z ) { return 1.0 / Math . sqrt ( x * x * planetModel . inverseAbSquared + y * y * planetModel . inverseAbSquared + z * z * planetModel . inverseCSquared ) ; }
compute the desired magnitude of a unit vector projected to a given planet model .
