extern int otb_6s_brdfgrid_(
  otb_6s_integer *mu,
  otb_6s_integer *np,
  otb_6s_doublereal *rm,
  otb_6s_doublereal *rp,
  otb_6s_doublereal *brdfdat,
  otb_6s_doublereal *angmu,
  otb_6s_doublereal *angphi,
  otb_6s_doublereal *brdfint
  );
