CGAL users discussion list

[Jan Legleitner <>]

Hello Sebastien,

thank you very much for the information.

After i found out how “CGAL_EIGEN3_ENABLED" works, i just needed to include 
"/usr/local/include/Eigen3“ to the header search paths of Xcode
and now everything works!!! thank you very much!

CGAL searches directly in Eigen/ for headers, but home-brew installs eigen in 
“Eigen3” i think this is why it did not work at first.

best regards
Jan


> On 26. Aug 2020, at 07:28, Sebastien Loriot (GeometryFactory) 
> ( via cgal-discuss Mailing List) 
> <> wrote:
> 
> I guess you are missing Eigen.
> http://eigen.tuxfamily.org/index.php?title=Main_Page
> 
> If Eigen is not available then the jet function requires you to manually
> give a svd traits:
> 
> https://doc.cgal.org/latest/Point_set_processing_3/group__PkgPointSetProcessing3Algorithms.html#ga549402c0a8a8b6b71875181e93961521
> 
> 
> Best,
> 
> Sebastien.
> 
> On 8/25/20 2:31 PM, Jan Legleitner wrote:
>> Hello,
>> i am trying to use cgal in one of my Xcode projects.
>> I made many attempts now since the last three days, but i always end up 
>> having many compilation errors, which are really hard to understand…
>> First i installed CGAL as stated here: 
>> https://doc.cgal.org/latest/Manual/usage.html by using home-brew:
>> brew install cgal
>> which worked perfectly and didn’t show any errors.
>> As i already set the user search paths to /usr/local/include and 
>> /usr/local/lib, i could directly use the CGAL headers in my project.
>> After trying some basic functions with the library i tried to do follow 
>> the surface reconstruction tutorial:
>> I figured out, that some functions would work and some not, for example:
>> CGAL::compute_average_spacing<CGAL::Sequential_tag> (points, 6);
>> would work perfectly with a list of points, but:
>> CGAL::jet_smooth_point_set<CGAL::Sequential_tag> (points, 24);
>> would result in many errors like: “Static_assert failed due to 
>> requirement’!(boost::is_same<CGAL::GetSvdTraits…."
>> or: “No matching function for call to object of type ‘Monge_jet_fitting 
>> (aka ‘Monge_via_jet_fitting…..”
>> I followed this tutorial on installing CGAL in Xcode: 
>> https://3d.bk.tudelft.nl/ken/en/2016/03/16/using-cgal-and-xcode.html
>> but since CGAL is header only those libraries don’t exist anymore.
>> To solve that problem, I could build CGAL with using cmake and add the 
>> missing libraries from that tutorial to my project, but this would not 
>> change anything.
>> If i download the examples folder and try to build with cmake, everything 
>> works perfectly. The only problem is,
>> that i don’t know what is missing for my Xcode project to use CGAL 
>> functions.
>> At the moment i added the following libraries to my *Xcode 11.6* project:
>> - libboost_thread-mt.dylib
>> - libgmp.10.dylib
>> - libmpfr.6.dylib
>> And made the following changed to the project settings:
>> - Always Search User Paths (Deprecated): YES
>> - Header search paths: /usr/local/include
>> - Library Search paths /usr/local/lib /usr/local/Cellar/gmp/6.2.0/lib 
>> /usr/local/Cellar/mpfr/4.1.0/lib /usr/local/Cellar/boost/1.73.0/lib
>> - User header search paths: /usr/local/include
>> I also already tried to generate a Xcode project with cmake:
>> |cmake -G Xcode<CGAL-5.0.3 path>|
>> which created a Xcode project, but only containing CMakeLists.txt files in 
>> each target??
>> nothing was build and i could also not select any application to run in 
>> the settings..
>> I did not use cmake in the past many times...
>> I hope this is the right email address and somebody is already using CGAL 
>> with Xcode!
>> Thank you very much!!
>> best regards
>> Jan
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