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Re: [cgal-discuss] Question about Mesh_3


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  • From: "Laurent Rineau (CGAL/GeometryFactory)" <>
  • To:
  • Cc: Zesen Qian <>
  • Subject: Re: [cgal-discuss] Question about Mesh_3
  • Date: Wed, 06 Jun 2018 17:41:59 +0200
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  • Organization: GeometryFactory

Le Tuesday, June 5, 2018 7:47:50 PM CEST Zesen Qian a écrit :
> Hi list,
>
> I have several question about Mesh_3.
>
> 1. I'm generating isosurface by implicit function. It requires that
> the center of the sphere be inside of the mesh. The question is, given
> an arbitrary mesh, how can I find such a point?

Hi,

You talk at the same time about an implicit function and a mesh. What is
actually your input?

> 2. Due to the first problem(I guess), the mesher seems to be sampling
> a lot at a specific spot on the surface, making the mesh very dense at
> that spot. While the generated mesh is self-intersection free by
> construction, the exported .off is not(because of the precision
> issue). I have set the precision to 17-digits and it doesn't help. I
> guess one approach is to give a lower bound on the facet_size, but I
> coudln't find such a parameter. Another approach is to simplify the
> mesh, but I'm worried this might lose some details of the mesh.

That is probably related. The default initialization of the mesh is done by
shooting random ray around a point (and that point is the center of the
sphere by default). If that point is close to the iso-surface, then ray
shootings will produces initial points that are very close.

--
Laurent Rineau, PhD
R&D Engineer at GeometryFactory http://www.geometryfactory.com/
Release Manager of the CGAL Project http://www.cgal.org/






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