CGAL users discussion list

[Jakob van Bethlehem <>]

Hej Mike,

I have some (extremely rough) PLY-stuff floating around on my HD somewhere, 
that may get you started. If you're interested, you can contact me off-list.

Sincerely,
Jakob

On 07/21/2012 07:40 PM, Michael Hull wrote:
> HI Felipe,
> Thanks for those links. I am trying to get the cgal-python bindings at the 
> moment; which would make output to ply much easier.
> I am still a little unclear about the difference between a triangulation and 
> a surface, but  I will keep looking through the documentation.
>
> Best regards
>
> Mike
>
>
> On 20 July 2012 10:25, Felipe de Jesus Trujillo Romero 
> <
>  
> <mailto:>>
>  wrote:
>
>     hello Mike,
>
>     in relation to the writer to PLY, I don't know if there is an 
> implementation on CGAL (I don't think so) but you can take a look to the 
> libply:
>
>     http://people.cs.kuleuven.be/~ares.lagae/libply/
>
>     or go over the website of Stanford 3D scanning repository:
>
>     http://graphics.stanford.edu/data/3Dscanrep/
>
>     bye
>
>     Felipe
>
>     *
>
>     **On Fri, 20 Jul 2012 08:56:32 -0500, Michael Hull wrote*
>      > Hello!
>      > I have been reading through the CGAL documentation, and it looks like 
> an amazing project.
>      > Unfortunately; I am having some trouble getting what I want out; so 
> before I write some hacky code; I thought I'd ask here.
>      >
>      > I basically want to take a set of points, (without normals), then use 
> alpha shapes to find a mesh over these points (since the shame has concavities), 
> then convert this shape into PLY file format.
>      > I looked through the examples, and found something similar loading a 
> bunny from a set of points into an alpha shape; which gives me access to the 
> vertices or facets, but at this point I got
>     confused about what exactly a triangulation is, how it compares to a 
> Surface, and how I access it from my Alpha_Shape_3 object.
>      > If someone could shed some light on this, I'd be very grateful!
>      >
>      > Also, is there a writer to PLY that exists already, before I write my 
> own?
>      >
>      > Many thanks in advance, and for work on what looks like a great 
> package.
>      >
>      > Mike
>      >
>      > P.S. I looked at the tutorial section, and some of the links are 
> broken. I think for beginners 'lightweighter' overview/introductory material is 
> very useful, since it can be difficult to get a
>     feeling of how all the components fit together, especially if you  are 
> not a C++ template guru :)