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[cgal-discuss] Meshing 3D segmented domain - small inclusion disappearance


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  • From: rychet <>
  • To:
  • Subject: [cgal-discuss] Meshing 3D segmented domain - small inclusion disappearance
  • Date: Thu, 6 Oct 2011 06:37:21 -0700 (PDT)

Dear developers and users,
I am not able to solve the following problem.
I have created simple segmented 3D image (.inr format) with 2 subdomains:

Cube of 256x256x256 voxels with label=1,
and inside it another small cube of the size 40x40x40 with label=2.

Then I used the following program (taken from the manual, part 50.3.3) and
obtained 3D mesh. The problem is that the small cubic inclusion disappeared
in the resulting mesh. I have also tried different meshing criteria, but
without success. For the big inclusion it works fine, inclusion is present.
In the mailing list I have not found similar problem.
Is there a possibility to control this feature?

Thank you, Ivan Rychetsky.

Code used for meshing:
**********************************************************
#include &lt;CGAL/Exact_predicates_inexact_constructions_kernel.h&gt;

#include &lt;CGAL/Mesh_triangulation_3.h&gt;
#include &lt;CGAL/Mesh_complex_3_in_triangulation_3.h&gt;
#include &lt;CGAL/Mesh_criteria_3.h&gt;

#include &lt;CGAL/Labeled_image_mesh_domain_3.h&gt;
#include &lt;CGAL/make_mesh_3.h&gt;
#include &lt;CGAL/Image_3.h&gt;

// Domain
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
typedef CGAL::Labeled_image_mesh_domain_3&lt;CGAL::Image_3,K&gt;
Mesh_domain;

// Triangulation
typedef CGAL::Mesh_triangulation_3<Mesh_domain>::type Tr;
typedef CGAL::Mesh_complex_3_in_triangulation_3<Tr> C3t3;

// Criteria
typedef CGAL::Mesh_criteria_3<Tr> Mesh_criteria;

// To avoid verbose function and named parameters call
using namespace CGAL::parameters;

int main()
{
// Loads image
CGAL::Image_3 image;
image.read("./domain.inr");

// Domain
Mesh_domain domain(image);

// Mesh criteria
Mesh_criteria criteria(facet_angle=30, facet_size=6, facet_distance=4,
cell_radius_edge=3, cell_size=8);

// Meshing
C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria);

// Output
std::ofstream medit_file("out.mesh");
c3t3.output_to_medit(medit_file);

return 0;
}
**************************************

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  • [cgal-discuss] Meshing 3D segmented domain - small inclusion disappearance, rychet, 10/06/2011

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