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

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Angus Dorbie (dorbie++at++bitch.reading.sgi.com)
Tue, 3 Sep 1996 10:32:34 +0100

Without checking the math too closely (I usually get a sign wrong here
or there first time 'round) this should be p = pfArcTan2(z, pfSqrt(x*x+y*y)).

For pitch you can get away with atanf(degtorad * z/sqrtf(x*x+y*y)) since
you only have two quadrants to worry about (at least on the way out you do).
I'm not claiming that this is faster than pfArcTan2, infact I expect it'll
be slower.

Rgds,
Angus.

On Sep 2, 2:35pm, Jeremy Friesner wrote:
> Subject: Unit vector -> (h,p,r) ?

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

>-- End of excerpt from Jeremy Friesner

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