extern int otb_6s_versbrdf_(
  otb_6s_integer *option,
  otb_6s_doublereal *optics,
  otb_6s_doublereal *struct__,
  otb_6s_integer *mu,
  otb_6s_integer *np,
  otb_6s_doublereal *rm,
  otb_6s_doublereal *rp,
  otb_6s_doublereal *brdfint
  );
