CGAL users discussion list

Hello Mariette,
you are right, there is no relation between alphashapes and shapefiles.

The only thing I want to do, is to write the boundaries which are defined by 
the set of points into a file.

Or am I totally wrong and alphashapes are not the right method to solve my 
problem.

Thanks 

andi


-------- Original-Nachricht --------
> Datum: Fri, 08 Aug 2008 14:59:14 +0200
> Von: Mariette Yvinec 
> <>
> An: 
> 
> Betreff: Re: [cgal-discuss] Boundary of alphashapes

>  From what I see in wikipedia
> there is no relationship between alphashapes and shape file...
> 
> and I still don't get what shape you want to get
> 
> Andi Jochem wrote:
> > Hello Mariette,
> >
> > a shapefile is a popular geospatial vector data format for geographic
> information systems
> > (http://en.wikipedia.org/wiki/Shapefile)
> >
> > As you already know, I am not very familiar with alphashapes, but maybe
> you can help me.
> >
> >
> >
> > I am just looking for a method to get the shape, defined by a set of
> points (the "concave hull" , not the convex hull). After an intensiv google
> search, I found the CGAL library, installed it and tried to write a function
> using alpha_shapes_3.
> >
> > My question is: How can I get, the shape which is defined by a set of
> points in file?
> >  
> >
> > Thanks
> >
> > Andi
> >
> >
> >
> >
> > -------- Original-Nachricht --------
> >   
> >> Datum: Fri, 08 Aug 2008 14:37:54 +0200
> >> Von: Mariette Yvinec 
> >> <>
> >> An: 
> >> 
> >> Betreff: Re: [cgal-discuss] Boundary of alphashapes
> >>     
> >
> >   
> >> I am rather familiar with Alpha_shape_3
> >> but I  can't answer your questions
> >> because I do not  understand them...
> >> In particular I don't know
> >> - what is a shapefile
> >> - nor which polygon you want to get out of alpha_shapes_3
> >> - nor what is  a roof plane
> >>
> >> 
> >>  wrote:
> >>     
> >>> Hello,
> >>> I wrote a function to get the alphashapes of a set of points, but how
> >>>       
> >> can I
> >>     
> >>> transform this alphashapes in a polygon...???
> >>> Is it posssible to transform the created alphashape in a shapefile???
> >>>
> >>> Is anybody familiar with alphashapes?? 
> >>>
> >>> Thanks a lot.
> >>>
> >>> andi
> >>>   
> >>>       
> >> -- 
> >> Mariette Yvinec
> >> Geometrica project team
> >> INRIA  Sophia-Antipolis  
> >>
> >>
> >>
> >> -- 
> >> You are currently subscribed to cgal-discuss.
> >> To unsubscribe or access the archives, go to
> >> https://lists-sop.inria.fr/wws/info/cgal-discuss
> >>     
> >
> >   
> 
> -- 
> Mariette Yvinec
> Geometrica project team
> INRIA  Sophia-Antipolis  
> 
> 
> 
> -- 
> You are currently subscribed to cgal-discuss.
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