> On the face of it I looks like either vrotate or atan2 is only accurate
> to within 5% ?

If you're expecting y=5 and z=16, then you need to make sure that the
starting vector has the same length as the vector <0,5,16>. That means you
should start with the vector <0,0,sqrt(5*5+16*16)>. As it is, you're
starting with a vector that is shorter than that, so you get y slightly less
than 5 and z slightly less than 16.

 - Slime
 [ http://www.slimeland.com/ ]

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