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Re: speher keyword of qhull [message #51285 is a reply to message #51173]

Thu, 09 November 2006 07:23

Andy Heaps
Messages: 22
Registered: March 2006

Junior Member

ITT-Vis help desk have resolved the query:

The SPHERE keyword to QHULL will return the Delaunay triangulation of
the points which lie on the surface of a sphere. Consider the
following example:

;***************************************************
> pro test
>
> seed = 1
> n = 50
>
> lon = randomu(seed, n) * 360. - 180.
> lat = randomu(seed, n) * 180. - 90.
> f = sin(lon * !dtor)^2 * cos(lat * !dtor)
>
> qhull, lon, lat, qtr, $
> SPHERE = q_sphere, /DELAUNAY
>
> qpolys = lonarr(4,(size(qtr, /DIM))[1])
> qpolys[0,*] = 3
> qpolys[1:3,*] = qtr
>
> q_poly = obj_new('idlgrpolygon', $
> q_sphere, COLOR = [0,255,0], $
> POLYGONS = qpolys, STYLE = 2)
>
> xobjview, q_poly, XSIZE = 400, YSIZE = 400, $
> XOFF = 410, YOFF = 450, $
> TITLE = 'QHULL triangulation'
>
> end
> ;***************************************************

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[Message index]

		Re: speher keyword of qhull By: David Fanning on Wed, 08 November 2006 08:34
		Re: speher keyword of qhull By: Andy Heaps on Wed, 08 November 2006 08:12
		Re: speher keyword of qhull By: David Fanning on Wed, 08 November 2006 06:47
		Re: speher keyword of qhull By: Haje Korth on Fri, 10 November 2006 09:55
		Re: speher keyword of qhull By: Andy Heaps on Thu, 09 November 2006 07:23

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