def srfnrm(method, target, et, fixref, srfpts):
    """
    Map array of surface points on a specified target body to 
    the corresponding unit length outward surface normal vectors. 
 
    The surface of the target body may be represented by a triaxial 
    ellipsoid or by topographic data provided by DSK files. 
    
    https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/srfnrm_c.html
    
    :param method: Computation method.
    :type method: str
    :param target: Name of target body. 
    :type target: str
    :param et: Epoch in TDB seconds past J2000 TDB. 
    :type et: float
    :param fixref: Body-fixed, body-centered target body frame. 
    :type fixref: str
    :param srfpts: Array of surface points.
    :type srfpts: 3xM-Element Array of floats
    :return: Array of outward, unit length normal vectors.
    :rtype: 3xM-Element Array of floats
    """
    method = stypes.stringToCharP(method)
    target = stypes.stringToCharP(target)
    et     = ctypes.c_double(et)
    fixref = stypes.stringToCharP(fixref)
    npts   = ctypes.c_int(len(srfpts))
    srfpts = stypes.toDoubleMatrix(srfpts)
    normls = stypes.emptyDoubleMatrix(3, npts.value)
    libspice.srfnrm_c(method, target, et, fixref, npts, srfpts, normls)
    return stypes.cMatrixToNumpy(normls)
def srfnrm ( method , target , et , fixref , srfpts ) : method = stypes . stringToCharP ( method ) target = stypes . stringToCharP ( target ) et = ctypes . c_double ( et ) fixref = stypes . stringToCharP ( fixref ) npts = ctypes . c_int ( len ( srfpts ) ) srfpts = stypes . toDoubleMatrix ( srfpts ) normls = stypes . emptyDoubleMatrix ( 3 , npts . value ) libspice . srfnrm_c ( method , target , et , fixref , npts , srfpts , normls ) return stypes . cMatrixToNumpy ( normls )
Map array of surface points on a specified target body to 
    the corresponding unit length outward surface normal vectors. 
 
    The surface of the target body may be represented by a triaxial 
    ellipsoid or by topographic data provided by DSK files. 
    
    https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/srfnrm_c.html
    
    :param method: Computation method.
    :type method: str
    :param target: Name of target body. 
    :type target: str
    :param et: Epoch in TDB seconds past J2000 TDB. 
    :type et: float
    :param fixref: Body-fixed, body-centered target body frame. 
    :type fixref: str
    :param srfpts: Array of surface points.
    :type srfpts: 3xM-Element Array of floats
    :return: Array of outward, unit length normal vectors.
    :rtype: 3xM-Element Array of floats