CGAL users discussion list

[Sebastien Loriot <>]

Not sure about that function but clip() should do what you expect.

Sebastien.

On 5/24/22 23:39, Marco Feder ( via cgal-discuss Mailing 
List) wrote:
> Hi,
>
> I need to ask something more about this. I have a surface mesh describing the 
> unit cube [0,1]^3 and another one describing the square [0.5,1.5]^2. Is 
> PMP::corefine_and_compute_intersection() supposed to work and find the 
> intersection between the two? So far it works *only* when the 2D square clips 
> the cube (as Andreas said), for instance with something like [-1.5,1.5]^2. 
> However, I’m wondering if there’s a way to get the intersection also in the 
> present case.
>
> Best regards,
> Marco
>
> > On 17 May 2022, at 12:04, Sebastien Loriot <> wrote:
> >
> > Yes.
> > Also the example from this PR could also be a solution:
> > https://github.com/CGAL/cgal/pull/6377
> >
> >
> > Sebastien.
> >
> >
> > On 5/17/22 11:49, Marco Feder ( via cgal-discuss Mailing List) 
> > wrote:
> > > Thanks Sebastien. Okay, that’s clear now. So, the only viable option is to use 
> > > https://doc.cgal.org/latest/Boolean_set_operations_2/index.html 
> > > <https://doc.cgal.org/latest/Boolean_set_operations_2/index.html> , right ?
> > > Best,
> > > Marco
> > > > On 17 May 2022, at 11:38, Sebastien Loriot < 
> > > > <>> wrote:
> > > >
> > > > What Andreas meant is that you can clip using a 2D polygon but pure 2D 
> > > > Boolean operations will not work with this function.
> > > >
> > > > Best,
> > > >
> > > > Sebastien.
> > > >
> > > > On 5/17/22 11:03, Marco Feder ( <> via 
> > > > cgal-discuss Mailing List) wrote:
> > > > > Thanks Andreas for your prompt reply. I tried the simplest possible example, 
> > > > > with two squares. The intersection is not performed, even if the second 
> > > > > clearly splits the first one and I don’t understand what is the issue here. 
> > > > > Am I missing something?
> > > > > See the attached mwe.
> > > > > Best,
> > > > > Marco
> > > > > > On 17 May 2022, at 09:53, Andreas Fabri < 
> > > > > > <> < 
> > > > > > <>>> wrote:
> > > > > >
> > > > > > What is important is that the quadrilateral splits the ball
> > > > > >
> > > > > > andreas
> > > > > >
> > > > > > On 5/17/2022 9:48 AM, Marco Feder ( <> 
> > > > > > < <>> via cgal-discuss Mailing List) 
> > > > > > wrote:
> > > > > > > Hi,
> > > > > > >
> > > > > > > I’m currently applying PMP::corefine_and_compute_boolean_operations() to 
> > > > > > > handle boolean operations between 3D (closed) surface meshes. Is this 
> > > > > > > supposed to work with 2D objects, too? For instance, I have two Surface_Mesh 
> > > > > > > describing a ball and a quadrilateral and I need their intersection. To my 
> > > > > > > understanding, the issue here is that those two are not *closed*, hence 
> > > > > > > corefine_and_compute_boolean_operations should not work. Is that correct?
> > > > > > >
> > > > > > > If so, the only option I see is to use 
> > > > > > > https://doc.cgal.org/latest/Boolean_set_operations_2/index.html 
> > > > > > > <https://doc.cgal.org/latest/Boolean_set_operations_2/index.html> 
> > > > > > > <https://doc.cgal.org/latest/Boolean_set_operations_2/index.html 
> > > > > > > <https://doc.cgal.org/latest/Boolean_set_operations_2/index.html>> , but I’d like to 
> > > > > > > hear your opinion about this.
> > > > > > >
> > > > > > >
> > > > > > > Best regards,
> > > > > > > Marco
> > > > > > >
> > > > > > >
> > > > > > >
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> > > > > > --
> > > > > > Andreas Fabri, PhD
> > > > > > Chief Officer, GeometryFactory
> > > > > > Editor, The CGAL Project
> > > > > >
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