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Re: Convex Hull 3D

• To: mathgroup at smc.vnet.net
• Subject: [mg65454] Re: [mg65430] Convex Hull 3D
• From: "Ingolf Dahl" <ingolf.dahl at telia.com>
• Date: Sun, 2 Apr 2006 05:00:15 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi,
Here are two tracks you might follow:
1) See http://library.wolfram.com/infocenter/MathSource/1160/ and
http://www.qhull.org/ for Qhull. Good luck! (I have not tried this myself)

2) See http://mathworld.wolfram.com/ConvexHull.html On that page there is a
link to download ConvexHull.m, and another to download ConvexHull.nb.
Download both! (The first is also included in
http://mathworld.wolfram.com/packages/MathWorldPackages.zip). Load the m
file first into Mathematica, and execute it. Then load the nb file, and
check the examples. You might also need
http://library.wolfram.com/infocenter/MathSource/5087/

Please answer to MathGroup and tell if you get anything interesting out of
this.

Best regards

Ingolf Dahl
Sweden

> -----Original Message-----
> From: Virgil Stokes [mailto:virgil.stokes at it.uu.se] 
To: mathgroup at smc.vnet.net
> To: mathgroup at smc.vnet.net
> Subject: [mg65454] [mg65430] Convex Hull 3D
> 
> Today I installed Mathematica 5.2 and although there are many 
> enhancements I was disappointed that it still does not have a 
> convex hull function for 3 dimensional objects. In earlier 
> contacts with Wolfram Research (several years ago), I was 
> given the impression that such a function would be part of 
> the next release; but, this has not happened.
> 
> Before sending this email, I checked "Wolfram Research 
> Forums", including "Documentation Center", "Mathematica 
> Information Center", and "MathGroup" which were not very 
> useful on finding a Mathematica implementation for finding 
> the convex hull of 3D objects. However, I did do a search 
> through the MathGroup archives and found that there was a 
> discussion on this topic, e.g. "[mg44708] Follow up: 3D Convex Hull" ,
> (2003-11-21) contained a link --- but link didn't work. I 
> finally did find a site that had an experimental Mathematical 
> implementation for Mathematica 3.0 and tried to get this 
> running in Mathematica 5.2; but, was unsuccessful.
> 
> I would appreciate greatly Mathematica code for finding the 
> convex hull of 3D objects.
> 
> --Thanks,
> V. Stokes
>