CGAL users discussion list

[Andrew Cunningham <>]

Hi Andreas,
No, it's not much of a major issue. Our 3D coordinates are 'float' but
it's easy enough to use double when creating CGAL structures.

I would be more interested in seeing some examples of the use of "PMP
split" algorithms.

Andrew

On Thu, Dec 3, 2020 at 1:46 AM Andreas Fabri
<> wrote:
>
> Hi Andrew,
>
> Is float what you use in your applications?   Adding support for it
> would not be a major issue,
> but you are the first user who requests that.
>
> Best,
>
> Andreas
>
> On 12/2/2020 10:33 PM, Andrew Cunningham wrote:
> > The issue can be resolved by using the <double> kernel. That's an
> > acceptable solution for me but does point out the difficulty of
> > template based programming when error messages can be obscure to say
> > the least.
> >
> > On Wed, Dec 2, 2020 at 10:16 AM Andrew Cunningham <> 
> > wrote:
> >> The error from the Visual C++ compiler ( 2019) is similar ( this is
> >> not a Intel Compiler issue)
> >>
> >> 1>D:\CGAL-5.1\include\CGAL/NT_converter.h(33,1): error C2440:
> >> '<function-style-cast>': cannot convert from 'const NT1' to 'NT2'
> >> 1>        with
> >> 1>        [
> >> 1>            NT1=CGAL::Lazy_exact_nt<CGAL::Gmpq>
> >> 1>        ]
> >> 1>        and
> >> 1>        [
> >> 1>            NT2=float
> >> 1>        ]
> >> 1>D:\CGAL-5.1\include\CGAL/NT_converter.h(33,19): message : No
> >> user-defined-conversion operator available that can perform this
> >> conversion, or the operator cannot be called
> >> 1>D:\CGAL-5.1\include\CGAL/NT_converter.h(32): message : while
> >> compiling class template member function 'NT2
> >> CGAL::NT_converter<CGAL::Lazy_exact_nt<CGAL::Gmpq>,NT2>::operator
> >> ()(const NT1 &) const'
> >>
> >> On Wed, Dec 2, 2020 at 10:06 AM Andrew Cunningham 
> >> <> wrote:
> >>> Hi,
> >>> I am trying to use
> >>>
> >>> void CGAL::Polygon_mesh_processing::split ( TriangleMesh &  tm,
> >>> const Plane_3 &  plane,
> >>> const NamedParameters &  np )
> >>>
> >>> There are no examples in 5.1 for this API.
> >>>
> >>>
> >>> When I do try and compile my code using this API and a <float> kernel
> >>> I am getting an error message
> >>>
> >>> using K = CGAL::Simple_cartesian< float >;
> >>> using Point_3                  = K::Point_3;
> >>> using Mesh                     = CGAL::Surface_mesh< Point_3 >;
> >>> using Plane                     = K::Plane_3;
> >>>
> >>>
> >>> CGAL/NT_converter.h(33): error : no suitable conversion function from
> >>> "const CGAL::Lazy_exact_nt<CGAL::Gmpq>" to "float" exists
> >>>
> >>> I am using the Intel 19.1 C++ compiler.
> >>>
> >>> Andrew
>
> --
> Andreas Fabri, PhD
> Chief Officer, GeometryFactory
> Editor, The CGAL Project
>
>
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