CGAL users discussion list

[Laurent Saboret <>]

Dear Wiredchop,

CGAL Poisson reconstruction will always create a closed surface. See 
http://doc.cgal.org/latest/Surface_reconstruction_points_3/#title13

If you start from a small mesh (or point set) that is not closed, the 
reconstruction will create a closed surface and you will have to detect 
and delete the extra triangles.
As far as I know, CGAL does not provide any algorithm for such 
detection. You have to write your own.

Best regards,
Laurent Saboret


Le 06/11/2014 21:39, Wiredchop a écrit :
> Hello all,
>
> I've managed to create a mesh from a point set using the Poisson
> reconstruction example.
>
> I'm interested in meshing only a portion of this surface though rather than
> the entire thing (for the purposes of hole filling).
>
> In the  documentation on mesh generation
> <http://doc.cgal.org/latest/Surface_mesher/index.html#SurfaceMesher_section_criteria>
> I noticed this: "The meshing algorithm requires to know the surface to be
> meshed only through an oracle able to tell whether a given segment, line or
> ray intersects the surface or not and to compute an intersection point if
> any. This feature makes the package generic enough to be applied in a wide
> variety of situations."
>
> and hoped it meant I was able to give it a small starting mesh and it return
> a corresponding mesh which intersects the implicit surface. I'm a little
> confused on how to implement this though, all the implicit surface functions
> seem to use a bounding sphere, suggesting to me the whole surface will be
> meshed.
>
> Can anyone provide a small sample of code to put me on the right track?
>
> All help greatly appreciated,
>
> Wiredchop
>
>
>
> --
> View this message in context: 
> http://cgal-discuss.949826.n4.nabble.com/Mesh-a-portion-of-an-implicit-surface-tp4660055.html
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