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[Andreas Fabri <>]

Hello,

while the wikipedia page on STL  https://en.wikipedia.org/wiki/STL_(file_format)#Color_in_binary_STL
mentions a way to store colors, the CGAL function write_STL()   does not handle this.

Best,

Andreas

On 7/7/2022 9:15 AM, Calvin Lim ( via cgal-discuss Mailing List) wrote:

Hi Sebastien,

 

           Attached is the input stl and output stl generated using write_STL function.

           Here is the minimal example:

 

 

#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>

#include <CGAL/Polyhedron_3.h>

#include <CGAL/IO/STL.h>

#include <iostream>

#include <fstream>

#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>

 

typedef CGAL::Exact_predicates_inexact_constructions_kernel Kernel;

 

template<class k, class e>

class Poly_Extend : public CGAL::Polyhedron_3<k, e>

{};

 

#define CGAL_GRAPH_TRAITS_INHERITANCE_TEMPLATE_PARAMS typename Kernel

#define CGAL_GRAPH_TRAITS_INHERITANCE_CLASS_NAME Poly_Extend<Kernel,CGAL::Polyhedron_items_3>

#define CGAL_GRAPH_TRAITS_INHERITANCE_BASE_CLASS_NAME CGAL::Polyhedron_3<Kernel,CGAL::Polyhedron_items_3>

#include <CGAL/boost/graph/graph_traits_inheritance_macros.h>

 

int main(int argc, char* argv[])

{

 

           Poly_Extend<Kernel, CGAL::Polyhedron_items_3> p3e;

 

           CGAL::IO::read_STL("cube_input.stl", p3e);

           CGAL::IO::write_STL("cube_output.stl", p3e);

}

 

 

Sent from Mail for Windows

 

From: Sebastien Loriot
Sent: Thursday, 7 July 2022 3:08 PM
To:
Subject: Re: [cgal-discuss] How to use CGAL::IO::write_STL using a polyhedron class

 

Would you have a minimal example we can run to reproduce this issue in
order to fix it?

Best,

Sebastien.

On 7/7/22 05:35, Calvin Lim ( via cgal-discuss
Mailing List) wrote:
> 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 <https://nam12.safelinks.protection.outlook.com/?url="https%3A%2F%2Fgo.microsoft.com%2Ffwlink%2F%3FLinkId%3D550986&amp;data=05%7C01%7C%7Cadd58bf6ef88496a321308da5fe77024%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637927744913746807%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=QesjX%2F0As4YxbYBzgQWx0AE9zX5jOil6aZ2sB02Zjv0%3D&amp;reserved=0>" for Windows
>
> *From: *Sebastien Loriot <mailto:>
> *Sent: *Tuesday, 5 July 2022 7:45 PM
> *To: * <mailto:>
> *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%7Cadd58bf6ef88496a321308da5fe77024%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637927744913746807%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=gzEbguS6y7W38gkfASOJC6wc%2BNTARgdhxPcyme%2FXteM%3D&amp;reserved=0"
> <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%7Cadd58bf6ef88496a321308da5fe77024%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637927744913746807%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=gzEbguS6y7W38gkfASOJC6wc%2BNTARgdhxPcyme%2FXteM%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%7Cadd58bf6ef88496a321308da5fe77024%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637927744913746807%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=QesjX%2F0As4YxbYBzgQWx0AE9zX5jOil6aZ2sB02Zjv0%3D&amp;reserved=0
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> for Windows
>  >
>  > *From: *Sebastien Loriot <
> <mailto:>>
>  > *Sent: *Tuesday, 5 July 2022 4:47 PM
>  > *To: * <
> <mailto:>>
>  > *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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>  >
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>  >
>  > --
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Andreas Fabri, PhD
Chief Officer, GeometryFactory
Editor, The CGAL Project