[PD] cartesian to polar coordinates

[Mathieu Bouchard]

On Thu, 20 Apr 2006 rodrigo at anorg.net wrote:

> is there an abstraction or external to transform 3D cartesian
> coordinates to polar ones? If you can give me a hint, you would save me
> the trigonometrical pain (I'm bad at this stuff).

Three-dimensional? You mean cylindrical or spherical?

BTW no-one agrees on how to do spherical, so from one formula to another, 
cos and sin are often swapped, sign changes, order of arguments change, 
etc.

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