@spiceErrorCheck<EOL>def pltnrm(v1, v2, v3):
v1 = stypes.toDoubleVector(v1)<EOL>v2 = stypes.toDoubleVector(v2)<EOL>v3 = stypes.toDoubleVector(v3)<EOL>normal = stypes.emptyDoubleVector(<NUM_LIT:3>)<EOL>libspice.pltnrm_c(v1, v2, v3, normal)<EOL>return stypes.cVectorToPython(normal)<EOL>
Compute an outward normal vector of a triangular plate. 
The vector does not necessarily have unit length. 

https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/pltnrm_c.html

:param v1: Vertices of a plate.
:type v1: 3-Element Array of floats
:param v2: Vertices of a plate. 
:type v2: 3-Element Array of floats
:param v3: Vertices of a plate. 
:type v3: 3-Element Array of floats
:return: Plate's outward normal vector.
:rtype: 3-Element Array of floats