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Re: [cgal-discuss] Alpha Shape 2 - No Edge Detection


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  • From: Andreas Fabri <>
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  • Subject: Re: [cgal-discuss] Alpha Shape 2 - No Edge Detection
  • Date: Tue, 03 Nov 2009 17:05:54 +0100

Daniel Duque wrote:
On Tuesday 03 November 2009 14:56:28 Michael Jeulin-L wrote:
Even If I tried to do a regularized detection,I still have no Edges...

Have you played with the value of alpha? Very small values should give you back all of the edges. Very large ones should give you the convex hull. It's weird, because you should always get something in between...

Best,

Daniel



Hello,

Very small values give you nothing back as then the alpha shape is
just the input point set. There will be an alpha shape edge, if a circle of
radius sqrt(alpha) can not pass between the two vertices, that is if
the squared distance of the two vertices is smaller than alpha.


andreas fabri



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