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Re: QHULL connectivity list - sorting possible? [message #77021 is a reply to message #77020]

Tue, 26 July 2011 10:38

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

Hi,

This may be what you need. QHull returns nothing but triangle vertex
indices, while IDL generally uses a more generic connectivity list.
Starting with vList, a (3, nVertices) array of XYZ points...

QHull, vList, tri ; tri becomes (3,
nTri)
nTri = N_Elements(tri)/3
pList = [Replicate(3, [1, nTri]), tri] ; Attach column of
'3' values
oMesh = Obj_New('IDLgrPolygon', vList, Polygons=pList)

Cheers,
-Dick

Dick Jackson Software Consulting
Victoria, BC, Canada --- +1-250-220-6117
dick@d-jackson.com --- http://www.d-jackson.com

On Jul 26, 6:59 am, asp <ayl...@gmail.com> wrote:
> Hi all,
>
> I am trying to apply QHULL to a thresholded volume and then use the
> result to create a mesh object. While I have been able to use MESH_OBJ
> with the results from QHULL the resultant object is a mess. I am
> thinking this may be due to the fact that the connectivity list in
> QHULL is not ordered. This is unlike TRIANGULATE, which does provide
> an ordered adjacency list. Does anyone have a suggestion for how to
> order the connectivity list from QHULL, or does anyone have a
> suggestion for another way I might go about doing this?
>
> Thanks!

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		Re: QHULL connectivity list - sorting possible? By: Dick Jackson on Tue, 26 July 2011 10:53
		Re: QHULL connectivity list - sorting possible? By: Dick Jackson on Tue, 26 July 2011 10:46
		Re: QHULL connectivity list - sorting possible? By: Dick Jackson on Tue, 26 July 2011 10:38

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