@spiceErrorCheck<EOL>def surfnm(a, b, c, point):
a = ctypes.c_double(a)<EOL>b = ctypes.c_double(b)<EOL>c = ctypes.c_double(c)<EOL>point = stypes.toDoubleVector(point)<EOL>normal = stypes.emptyDoubleVector(<NUM_LIT:3>)<EOL>libspice.surfnm_c(a, b, c, point, normal)<EOL>return stypes.cVectorToPython(normal)<EOL>
This routine computes the outward-pointing, unit normal vector
from a point on the surface of an ellipsoid.

http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/surfnm_c.html

:param a: Length of the ellisoid semi-axis along the x-axis.
:type a: float
:param b: Length of the ellisoid semi-axis along the y-axis.
:type b: float
:param c: Length of the ellisoid semi-axis along the z-axis.
:type c: float
:param point: Body-fixed coordinates of a point on the ellipsoid'
:type point: 3-Element Array of floats
:return: Outward pointing unit normal to ellipsoid at point.
:rtype: 3-Element Array of floats