SMS: Fix placement

Surface_mesh_simplification/test/Surface_mesh_simplification/CMakeLists.txt

@@ -6,6 +6,7 @@ project(Surface_mesh_simplification_Tests)
 
 find_package(CGAL REQUIRED)
 
+create_single_source_cgal_program("issue_8213.cpp")
 create_single_source_cgal_program("edge_collapse_topology.cpp")
 create_single_source_cgal_program("test_edge_collapse_bounded_distance.cpp")
 create_single_source_cgal_program("test_edge_collapse_Envelope.cpp")

Surface_mesh_simplification/test/Surface_mesh_simplification/data/issue_8213.off

@@ -0,0 +1,16 @@
+OFF
+5 4 0
+
+  0.60153250345565623 3.2925554343503594 -0.93390733763467004
+  0.50125687092531912 3.266008536541555 -0.80580753798383942
+  0.57499779785916183 3.2558452065056969 -0.97860403852322797
+  0.56586410588624558 3.2541065339825863 -0.99341202997519495
+  0.56756366821062887 3.2478315549358072 -0.99100621040927039
+
+ 3    0 1 2
+ 3    1 3 2
+ 3    1 0 3
+ 3    0 4 3
+
+
+

Surface_mesh_simplification/test/Surface_mesh_simplification/issue_8213.cpp

@@ -0,0 +1,44 @@
+#include <CGAL/Simple_cartesian.h>
+#include <CGAL/Surface_mesh.h>
+#include <CGAL/Surface_mesh_simplification/edge_collapse.h>
+#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Bounded_normal_change_filter.h>
+#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Face_count_stop_predicate.h>
+#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/LindstromTurk_cost.h>
+#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/LindstromTurk_placement.h>
+
+#include <cstdlib>
+#include <iostream>
+#include <fstream>
+
+namespace SMS = CGAL::Surface_mesh_simplification;
+
+typedef CGAL::Simple_cartesian<double> Kernel;
+typedef CGAL::Surface_mesh<Kernel::Point_3> Surface_mesh;
+
+int main() {
+
+  std::string filename("data/issue_8213.off");
+
+  Surface_mesh surface_mesh;
+
+  std::ifstream in(filename);
+  in >> surface_mesh;
+
+  const size_t target_number_of_faces = 3;
+  SMS::Face_count_stop_predicate<Surface_mesh> stop(target_number_of_faces);
+
+  std::cout << "Input mesh number of faces: " << surface_mesh.number_of_faces() << ", target number of faces: " << target_number_of_faces << std::endl;
+
+  SMS::edge_collapse(
+    surface_mesh,
+    stop,
+    CGAL::parameters::
+       filter(SMS::Bounded_normal_change_filter<>())
+      .get_cost(SMS::LindstromTurk_cost<Surface_mesh>())
+      .get_placement(SMS::LindstromTurk_placement<Surface_mesh>())
+    );
+
+  std::cout.precision(17);
+  std::cout <<  surface_mesh << std::endl;
+  return EXIT_SUCCESS;
+}