extern int otb_6s_hapkbrdf_(
  otb_6s_doublereal *om,
  otb_6s_doublereal *af,
  otb_6s_doublereal *s0,
  otb_6s_doublereal *h__,
  otb_6s_integer *mu,
  otb_6s_integer *np,
  otb_6s_doublereal *rm,
  otb_6s_doublereal *rp,
  otb_6s_doublereal *brdfint
  );
