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Re: how to define theta and phi of a sphere in IDL [message #68589 is a reply to message #68588]

Sat, 14 November 2009 21:18

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

nisha katyal writes:

> I have to draw spheres using idl . I want to define x,y,z in terms of
> r,theta and phi. Do i have to define theta and phi both as following:
>
> IDL> phi=2*!pi*(findgen(npoints)/(npoints-1))

You can use CV_COORD to convert back and forth from
polar, spherical, and rectangular coordinates. You
don't have to do it yourself.

> And also if i want to plot,should i plot x,z or y,z or x,y?

Generally, if you are plotting on a rectangular
coordinate system, you will need rectangular coordinates.
But you can do this conversion just before plotting.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: how to define theta and phi of a sphere in IDL By: penteado on Sat, 14 November 2009 22:20
		Re: how to define theta and phi of a sphere in IDL By: David Fanning on Sat, 14 November 2009 22:11
		Re: how to define theta and phi of a sphere in IDL By: nisha katyal on Sat, 14 November 2009 21:33
		Re: how to define theta and phi of a sphere in IDL By: David Fanning on Sat, 14 November 2009 21:18

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