[Proj] Normal vector to a point on an Earth ellipsoid

Ung kopilists at googlemail.com
Tue Feb 3 10:54:22 EST 2009

Hi All,

Is there a function within Proj4 that would return a representation of a
normal vector to a point on an Earth ellipsoid? Perhaps something like:

getNormal( projPJ my_cs, double x, double y, double z )

Would be grateful for any clues!
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