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[Sebastien Loriot <>]

What the assertion says is that you need more points than the degree
of the jet to be fitted. To be honest if you have only 4 points I don't
think poisson reconstruction will give you something relevant.
Advancing front is probably you best option.

Sebastien.

On 7/6/22 16:58, KL ( via cgal-discuss Mailing List) 
wrote:
> Hello,
> Following that tuto:
> https://doc.cgal.org/latest/Manual/tuto_reconstruction.html#TutorialsReconstruction_recap 
> <https://doc.cgal.org/latest/Manual/tuto_reconstruction.html#TutorialsReconstruction_recap>
> with the latest version of CGAL, I get:
> The error is CGAL ERROR: precondition violation!
> Expr: nb_input_pts >= nb_d_jet_coeff
> File: include/CGAL/Monge_via_jet_fitting.h
> when calling CGAL::jet_smooth_point_set<CGAL::Sequential_tag> (points, 24);
> The point_set has 4 points in it. I tried with a reduced number of 
> neighbors points, same thing.
> Please note: the advancing_front_surface_reconstruction section works fine.
> *Code:*
> auto poisson_variant ( Point_set &points, double spacing, mpol3d &out ) 
> -> void{
>      if ( points.empty() ){
>              return;
>      }
>      CGAL::jet_smooth_point_set <CGAL::Sequential_tag> ( points, 24 ); 
> <- exception here
>      CGAL::jet_estimate_normals <CGAL::Sequential_tag> ( points, 24 );  
> // Use 24 neighbors
>      // Orientation of normals, returns iterator to first unoriented point
>      typename Point_set::iterator unoriented_points_begin = 
> CGAL::mst_orient_normals( points, 24 ); // Use 24 neighbors
>      points.remove( unoriented_points_begin, points.end() );
>      CGAL::Surface_mesh <Point_3> output_mesh;
>      CGAL::poisson_surface_reconstruction_delaunay( points.begin(), 
> points.end(),
>                                                      points.point_map(), 
> points.normal_map(),
>                                                      output_mesh, spacing );
>      for ( auto &r : output_mesh.faces() ){
>              cout << "";
>      }
> }
> What are the corrective actions?
> Thanks
> --
> MKL
>
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