Add is_triangle_mesh test in Surface_mesh_segmentation package

Surface_mesh_segmentation/examples/Surface_mesh_segmentation/sdf_values_example.cpp

@@ -16,8 +16,8 @@ int main()
   // create and read Polyhedron
   Polyhedron mesh;
   std::ifstream input("data/cactus.off");
-  if ( !input || !(input >> mesh) || mesh.empty() ) {
-    std::cerr << "Not a valid off file." << std::endl;
+  if ( !input || !(input >> mesh) || mesh.empty() || ( !CGAL::is_triangle_mesh(mesh)) ) {
+    std::cerr << "Input is not a triangle mesh" << std::endl;
     return EXIT_FAILURE;
   }
 
@@ -48,4 +48,5 @@ int main()
       std::cout << sdf_property_map[facet_it] << " ";
   }
   std::cout << std::endl;
+  return EXIT_SUCCESS;
 }

Surface_mesh_segmentation/examples/Surface_mesh_segmentation/segmentation_from_sdf_values_OpenMesh_example.cpp

@@ -27,7 +27,11 @@ int main(int argc, char** argv )
     OpenMesh::IO::read_mesh(mesh, argv[1]);
   else
     OpenMesh::IO::read_mesh(mesh, "data/cactus.off");
-
+ 
+  if (!CGAL::is_triangle_mesh(mesh)){
+    std::cerr << "Input geometry is not triangulated." << std::endl;
+    return EXIT_FAILURE;
+  }
   std::cout << "#F : " << num_faces(mesh) << std::endl;
   std::cout << "#H : " << num_halfedges(mesh) << std::endl;
   std::cout << "#V : " << num_vertices(mesh) << std::endl;
@@ -65,4 +69,5 @@ int main(int argc, char** argv )
   // Note that we can use the same SDF values (sdf_property_map) over and over again for segmentation.
   // This feature is relevant for segmenting the mesh several times with different parameters.
   CGAL::segmentation_from_sdf_values(mesh, sdf_property_map, segment_property_map, number_of_clusters, smoothing_lambda);
+  return EXIT_SUCCESS;
 }

Surface_mesh_segmentation/examples/Surface_mesh_segmentation/segmentation_from_sdf_values_SM_example.cpp

@@ -29,6 +29,10 @@ int main(int argc, char** argv )
     std::ifstream cactus("data/cactus.off");
     cactus >> mesh;
   }
+  if (!CGAL::is_triangle_mesh(mesh)){
+    std::cerr << "Input geometry is not triangulated." << std::endl;
+    return EXIT_FAILURE;
+  }
   typedef Mesh::Property_map<face_descriptor,double> Facet_double_map;
   Facet_double_map sdf_property_map;
 
@@ -62,4 +66,5 @@ int main(int argc, char** argv )
   // Note that we can use the same SDF values (sdf_property_map) over and over again for segmentation.
   // This feature is relevant for segmenting the mesh several times with different parameters.
   CGAL::segmentation_from_sdf_values(mesh, sdf_property_map, segment_property_map, number_of_clusters, smoothing_lambda);
+  return EXIT_SUCCESS;
 }

Surface_mesh_segmentation/examples/Surface_mesh_segmentation/segmentation_from_sdf_values_example.cpp

@@ -16,8 +16,8 @@ int main()
     // create and read Polyhedron
     Polyhedron mesh;
     std::ifstream input("data/cactus.off");
-    if ( !input || !(input >> mesh) || mesh.empty() ) {
-      std::cerr << "Not a valid off file." << std::endl;
+    if ( !input || !(input >> mesh) || mesh.empty()  || ( !CGAL::is_triangle_mesh(mesh))) {
+      std::cerr << "Input is not a triangle mesh." << std::endl;
       return EXIT_FAILURE;
     }
 
@@ -54,4 +54,6 @@ int main()
     // This feature is relevant for segmenting the mesh several times with different parameters.
     CGAL::segmentation_from_sdf_values(
       mesh, sdf_property_map, segment_property_map, number_of_clusters, smoothing_lambda);
+
+    return EXIT_SUCCESS;
 }

Surface_mesh_segmentation/examples/Surface_mesh_segmentation/segmentation_via_sdf_values_example.cpp

@@ -16,7 +16,7 @@ int main()
     // create and read Polyhedron
     Polyhedron mesh;
     std::ifstream input("data/cactus.off");
-    if ( !input || !(input >> mesh) || mesh.empty() ) {
+    if ( !input || !(input >> mesh) || mesh.empty() || ( !CGAL::is_triangle_mesh(mesh)) ) {
         std::cerr << "Not a valid off file." << std::endl;
         return EXIT_FAILURE;
     }
@@ -37,4 +37,5 @@ int main()
         std::cout << segment_property_map[facet_it] << " ";
     }
     std::cout << std::endl;
+    return EXIT_SUCCESS;
 }

Surface_mesh_segmentation/examples/Surface_mesh_segmentation/segmentation_with_facet_ids_example.cpp

@@ -39,7 +39,7 @@ int main()
     // create and read Polyhedron
     Polyhedron mesh;
     std::ifstream input("data/cactus.off");
-    if ( !input || !(input >> mesh) || mesh.empty() ) {
+    if ( !input || !(input >> mesh) || mesh.empty() || ( !CGAL::is_triangle_mesh(mesh)) ) {
       std::cerr << "Not a valid off file." << std::endl;
       return EXIT_FAILURE;
     }
@@ -76,4 +76,5 @@ int main()
         std::cout << segment_property_map[facet_it] << " ";
     }
     std::cout << std::endl;
+    return EXIT_SUCCESS;
 }