CGAL users discussion list

[Calvin Lim <>]

Hi Sebastien,

 

           Thanks, it resolved my problem of how to use the write_STL function.

 

           One particular thing I noted is that, if I use the default write_STL function, it generate the file in binary format. If I go ahead and open up the file in Meshlab, all the faces are coloured with (64,8,0) value. In ascii format, there is no color information attached to the faces.

 

           Do you have a method to remove the color property written into the binary STL ? or change the color ourselves?

           Thanks!

 

Regards

Calvin

 

Sent from Mail for Windows

 

From:
Sent: Tuesday, 5 July 2022 7:45 PM
To:
Subject: Re: [cgal-discuss] How to use CGAL::IO::write_STL using a polyhedron class

 

If you inherit, then the final class is not automatically a
FaceListGraph model.

See this example for how to get all defined correctly:

https://nam12.safelinks.protection.outlook.com/?url="https%3A%2F%2Fdoc.cgal.org%2Flatest%2FBGL%2FPolyhedron_2poly_derivation_8cpp-example.html&amp;data=05%7C01%7C%7Cece68dbcfb9a48bf94bd08da5e7bda0e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637926183272894655%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=jpKJZ14EzAue61kKEP9PB3okomrSvxkwxfrKyoIXMH0%3D&amp;reserved=0

Sebastien.

On 7/5/22 13:31, Calvin Lim ( via cgal-discuss
Mailing List) wrote:
> Hi Sebastien,
>
>           I tried to zoom into where I am facing problems at, this is my
> simple code.
>
> typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;
>
> typedef CGAL::Polyhedron_3<Kernel, CGAL::Polyhedron_items_3> Poly_3;
>
> template<class k, class e>
>
> class Poly_Extend : public CGAL::Polyhedron_3<k, e>
>
> {};
>
> int main(int argc, char* argv[])
>
> {
>
>             Poly_3 p3;
>
>             Poly_Extend<Kernel, CGAL::Polyhedron_items_3> p3e;
>
>             std::ofstream outputfile("1.stl");
>
>             CGAL::IO::write_STL(outputfile, p3);  // this works
>
>             CGAL::IO::write_STL(outputfile, p3e); // this came up with a
> lot of compilation errors.
>
> }
>
>           In this example, p3 works while p3e just cannot be compiled.
> Do you have any ideas where are the errors?
>
>           Thanks a lot for your help.
>
> Regards
>
> Calvin
>
> Sent from Mail <https://nam12.safelinks.protection.outlook.com/?url="https%3A%2F%2Fgo.microsoft.com%2Ffwlink%2F%3FLinkId%3D550986&amp;data=05%7C01%7C%7Cece68dbcfb9a48bf94bd08da5e7bda0e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637926183272894655%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=nspUxVveFDLMLYAsWkf%2B7aHjrWZhgGQQ2Ikze2UL1Vs%3D&amp;reserved=0> for Windows
>
> *From: *Sebastien Loriot <>
> *Sent: *Tuesday, 5 July 2022 4:47 PM
> *To: * <>
> *Subject: *Re: [cgal-discuss] How to use CGAL::IO::write_STL using a
> polyhedron class
>
> In your example you use operator<< not write_OFF.
>
> Something like that should work:
>
> std::ofstream outputfile(“poly.stl”);
> CGAL::IO::write_STL(outputfile, polyhedron_class);
>
> Sebastien.
>
>
> On 7/5/22 10:40, Calvin Lim ( via cgal-discuss
> Mailing List) wrote:
>  >                      ofstream outputfile(“poly.off”);
>  >
>  >                        outputfile << polyhedron_class ;
>  >
>  >                        outputfile.close();
>  >
>
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