Unit vector -> (h,p,r) ?

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Jeremy Friesner (jaf++at++chem.ucsd.edu)
Mon, 2 Sep 1996 14:35:25 -0700 (PDT)

Hi all,

This question probably has a very obvious answer, but for
some reason it is eluding me:

What is a good reliable way to transform a unit vector (x,y,z) representing
a direction back into (h,p,r) form? I can sort of do this by doing

h = pfArcTan2(x,y);
p = pfArcTan2(z,y);
r = ???;

but this only seems to give the correct results in some cases. (And
I don't believe there is a way to reconstruct r!)
  
Thanks for any help,
Jeremy

jfriesne++at++chem.ucsd.edu
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