CGAL users discussion list

["Sebastien Loriot (GeometryFactory)" <>]

I think you are not using the right tool for what you want to achieve.

Your 2 meshes are perfectly aligned on the same grid.
If you want to union them, simply sort all the points, assign them an id
and remove duplicated faces.

I think, this can be done directly with the polygon soup repairing tools
of Polygon mesh processing:

https://doc.cgal.org/latest/Polygon_mesh_processing/index.html#title40

Put you two meshes in the same soup, merge duplicate points, remove 
isolated points and merge duplicate polygon.

Then a call to orient_polygon_soup will duplicate non-manifold edges.

Also you might want to have a look at the Mesh_3 package that is able
to mesh image with multiple domains.

Sebastien.

On 9/24/19 7:32 PM, Shrabani Ghosh wrote:
> Hi Sebastien,
>
> I tried with Nef_3 polyhedron on your reference. I wanted to do the 
> union operation. But after some time, I am seeing it showing "killed". 
> what could be the reason for this. I am attaching the files here. Could 
> you please look into it?
> colored_bone_MMM.off 
> <https://drive.google.com/file/d/1AMRGNIzMYGqwPlFn3jCbDr4nJ3fhDl7a/view?usp=drive_web>
> colored_hole_MMM.off 
> <https://drive.google.com/file/d/1bnqgJ-cPpZnaup0bQPxC3V6D0UW8QK_S/view?usp=drive_web>
>
> Regards
> Shrabani Ghosh
>
> On Fri, Sep 20, 2019 at 4:39 AM Sebastien Loriot (GeometryFactory) 
> < <mailto:>> wrote:
>
>       From your description it seems that you are interested in doing
>     Boolean
>     operations on triangle meshes.
>
>     The Polygon Mesh Processing package provide such a functionality for
>     manifold objects:
>
>     https://doc.cgal.org/latest/Polygon_mesh_processing/index.html#title12
>
>     The more general Nef_3 package provides operations for general meshes:
>     https://doc.cgal.org/latest/Nef_3/index.html
>
>     Sebastien.
>
>     On 9/12/19 11:58 PM, Shrabani Ghosh wrote:
>      > Hi,
>      >
>      > I want to attach two mesh together so that they will be placed
>     perfectly
>      > under the same coordinates.
>      >
>      > Like these are two meshes.
>      > <http://cgal-discuss.949826.n4.nabble.com/file/t376134/28.png>
>      > <http://cgal-discuss.949826.n4.nabble.com/file/t376134/29.png>
>      >
>      > After they will be attached together, they should be looked like
>     this.
>      >
>      > <http://cgal-discuss.949826.n4.nabble.com/file/t376134/30.png>
>      >
>      >
>      >
>      > --
>      > Sent from: http://cgal-discuss.949826.n4.nabble.com/
>      >
>
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