# [pstricks] pst-3Dplot

Patrice Mégret Patrice.Megret at umons.ac.be
Fri Aug 28 07:48:36 CEST 2009

```Dear Herbert,

Oups, I was of course speaking about spherical coordinates (page 6 of st-3dplot documentation).

Patrice

-----Message d'origine-----
De : pstricks-bounces at tug.org [mailto:pstricks-bounces at tug.org] De la part de Herbert Voss
Envoyé : jeudi 27 août 2009 18:54
À : Graphics with PSTricks
Objet : Re: [pstricks] pst-3Dplot

Patrice Mégret schrieb:

> In pst-3Dplot, there is the possibility to work in cylindrical coordinates.
>
> If I have correctly understood, (r,phi,theta) means here r the length of the vector, phi (0<=phi<360) the angle between the x-axis and the projection of the vector on the xy plane and theta (-90<=theta<=90), the angle between the vector and the xy plane.

Patrice,

the cylindrical coordinates are (r,phi,z), radius, angle, height

> Would it be possible to have a second cylindrical system (r,theta1,phi1) in which:
> r is the length of the vector,
> theta (0<=theta<=180) is the angle between the vector and z-axis,
> phi (0<=phi<360) the angle between the x-axis and the projection of the vector on the xy plane
> in order to have the same conventions as in mathematical book related to vector analysis?

do you mean the coordinates, defined by Arfken?

http://mathworld.wolfram.com/CylindricalCoordinates.html

HErbert

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