Failing to include libigl in my visual studio project

[herronelou]

Hi,
I'm currently self-learning C++ and have been on this journey for a couple of years in my spare time, and while I'm starting to be comfortable with writing C++, I'm still having a hard time with templates and certain external libraries.
I had written a plugin for a VFX software that relied on CGAL's Delaunay triangulation, but I've since realized its GPL license is not compatible with the non-open-source software I'm compiling for, so I'm attempting to replace all the CGAL usage with libigl's Delaunay Triangulation instead. I'm starting to wrap my head around the differences, but I'm failing miserably at getting my code to compile.

I'm working on Windows with Visual Studio, and at first included #include <igl/delaunay_triangulation.h>, although I wasn't sure what to give for the Orient2D orient2D and InCircle incircle arguments.
I then found #include <igl/predicates/delaunay_triangulation.h> which pre-defines those, so I switched to that.

At that point I only had igl's include directory in my projects additional includes.

I was then getting the error:

C:\Users\herro\repos\libigl\include\igl\predicates\delaunay_triangulation.cpp(10,10): fatal error C1083: Cannot open include file: 'predicates.h': No such file or directory

I then found and downloaded https://github.com/libigl/libigl-predicates and added those to my additional includes.

Once I did that, I got past this error, and instead I am now getting:

MyCode.obj : error LNK2001: unresolved external symbol incircle
MyCode.obj : error LNK2001: unresolved external symbol orient2d

I've not been able to get past that error. Usually when I had linker errors in the past it was with separately compiled libraries, but my understanding was that igl could simply be included and did not need to be pre-compiled?

I can see incircle.h/.cpp and orient2d.h/.cpp in the C:\Users\herro\repos\libigl\include\igl\predicates folder, I tried adding that folder to my additional include paths but that did not help. I spent a few hours today googling and asking AI for help but nothing useful came out, I'm hoping someone here can help me get past this point.

Thanks in advance.

[herronelou]

Well, it took me another 3 hours of digging, but I finally understood that I needed to compile libigl-predicates (the .c portion of the code) and I was finally able to compile my code!