CGAL users discussion list

[Mariette Yvinec <>]

Hi Kamal

using a mesh domain that is a model of MeshDomainWithFeatures_3
you may have some features (like segments) represented in the final mesh
however those features are not going to be preserve as is, they
are going to be remeshed and the connectivity of their
input vertices will not be preserved.

There is no way to preserve input segments
without allowing subdivision of them with CGAL mesh_3 package.
You may occasionally succeed if your input segments
are short compared to the length and size criteria but this
is by no way guaranteed.

Le 05/09/13 14:02, a écrit :

Hi Mariette,

Thanks a lot for the help,

 

I want to keep connectivity between the points (edges) as well.

I tried c3t3.triangulatiun().insert() but only the points were inserted and

their connection (edges) are not preserved.

 

I have a mesh c3t3. I have another surface (polyhedron) covering this mesh (with no intersection, good point).

I want to add the covered surface points and its edges as well.

 

I used add feature function but there are many edges to be preserved.

 

I wanted to know if there is another way to insert the surface points with the connectivity?

 

Do you think this is possible if I insert the surface points and then I play over the mesh criteria (in the remesh step)

in order to keep the connections?

 

From: [mailto:] On Behalf Of Mariette Yvinec
Sent: Thursday, September 05, 2013 12:11 PM
To:
Subject: Re: [cgal-discuss] surface point insertion

 

Hi Kamal

I am not sure to understand your problem
but still I make an attempt of solution :

you may insert whatever points you want (surface points in particular)
in the triangulation,
using
c3t3.triangulatiun().insert() before launching the meshing process.
These points will be preserved in the final mesh
if you next build the mesh using refine_mesh()

Le 03/09/13 17:54, a écrit :

Hi Laurent,

I am looking for an example using the following function,

But before I want to know if this preserves the surface connectivity as well?

c3t3.insert_surface_points(...))

I tried also to add a contour (as a feature) from the respective surface using:

 domain.add_features(polylines.begin(), polylines.end());

this works perfectly but when I added all edges from the surface, I was not successful. 

-----Original Message-----

From:  [mailto:] On Behalf Of Laurent Rineau (CGAL/GeometryFactory)

Sent: Tuesday, September 03, 2013 5:42 PM

To: 

Subject: Re: [cgal-discuss] surface point insertion

Le mardi 03 septembre 2013 15:37:17  a écrit :

Is there any example for inserting surface points (with connectivity) 

into a volumetric mesh?

Please be more explicit. What do you call a volumetric mesh? The 'c3t3' 

created by the CGAL 3D mesh generator?

What you want is probably quite difficult to implement without knowing a lot of the internal of the CGAL 3D mesh generator.

--

Laurent Rineau, PhD

R&D Engineer at GeometryFactory           http://www.geometryfactory.com/

Release Manager of the CGAL Project       http://www.cgal.org/

-- 

Mariette Yvinec

Geometrica project team

INRIA  Sophia-Antipolis  

-- 
Mariette Yvinec
Geometrica project team
INRIA  Sophia-Antipolis