Periodic_triangulation_3: Fix warning in demo

Fix bad 'if' condition & warning (#9126 )
## Summary of Changes ``` Building CXX object test/Stream_support/CMakeFiles/issue8155.dir/issue8155.cpp.o cd /home/cgal_tester/build/src/cmake/platforms/ArchLinux-clang-CXX20-Release/test/Stream_support && /bin/clang++ -DCGAL_DATA_DIR=\"/mnt/testsuite/data\" -DCGAL_TEST_SUITE=1 -DCGAL_USE_GMPXX=1 -I/home/cgal_tester/build/src/cmake/platforms/ArchLinux-clang-CXX20-Release/include -I/mnt/testsuite/include -isystem /usr/local/boost/include -Wall -O3 -std=c++20 -DCGAL_NDEBUG -MD -MT test/Stream_support/CMakeFiles/issue8155.dir/issue8155.cpp.o -MF CMakeFiles/issue8155.dir/issue8155.cpp.o.d -o CMakeFiles/issue8155.dir/issue8155.cpp.o -c /mnt/testsuite/test/Stream_support/issue8155.cpp /mnt/testsuite/test/Stream_support/issue8155.cpp:27:17: warning: overlapping comparisons always evaluate to true [-Wtautological-overlap-compare] 27 | if (len > 0 || len != 1.0) { | ~~~~~~~~^~~~~~~~~~~~~ 1 warning generated. ``` https://cgal.geometryfactory.com/CGAL/testsuite/CGAL-6.2-Ic-36/Stream_support/TestReport_cgaltest_ArchLinux-clang-CXX20-Release.gz ## Release Management * Affected package(s): `Stream_support` * Issue(s) solved (if any): n/a * Feature/Small Feature (if any): n/a * License and copyright ownership: no change
2025-12-03 11:36:14 +01:00 · 2025-11-19 14:43:26 +01:00 · 2025-11-19 14:42:28 +01:00 · 2025-11-19 14:41:58 +01:00 · 2025-11-19 14:41:07 +01:00 · 2025-11-13 16:32:40 +01:00
103 changed files with 451 additions and 296 deletions
--- a/BGL/include/CGAL/boost/graph/Euler_operations.h
+++ b/BGL/include/CGAL/boost/graph/Euler_operations.h
@ -1543,10 +1543,10 @@ does_satisfy_link_condition(typename boost::graph_traits<Graph>::edge_descriptor
 *
 * After the collapse of edge `e` the following holds:
 *   - The edge `e` is no longer in `g`.
- *   - The faces incident to edge `e` are no longer in `g`.
+ *   - The triangle faces incident to edge `e` are no longer in `g`.
 *   - `v0` is no longer in `g`.
- *   - If `h` is not a border halfedge, `p_h` is no longer in `g` and is replaced by `o_n_h`.
- *   - If the opposite of `h` is not a border halfedge, `p_o_h` is no longer in `g` and is replaced by `o_n_o_h`.
+ *   - If `h` is part of a triangle face, `p_h` is no longer in `g` and is replaced by `o_n_h`.
+ *   - If the opposite of `h` is part of a triangle face, `p_o_h` is no longer in `g` and is replaced by `o_n_o_h`.
 *   - The halfedges kept in `g` that had `v0` as target and source now have `v1` as target and source, respectively.
 *   - No other incidence information is changed in `g`.
 *
@ -1575,9 +1575,8 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor e,
  bool lBottomFaceExists      = ! is_border(qp,g);
  bool lTopLeftFaceExists     = lTopFaceExists    && ! is_border(pt,g);
  bool lBottomRightFaceExists = lBottomFaceExists && ! is_border(qb,g);
-
-  CGAL_precondition( !lTopFaceExists    || (lTopFaceExists    && ( degree(target(pt, g), g) > 2 ) ) ) ;
-  CGAL_precondition( !lBottomFaceExists || (lBottomFaceExists && ( degree(target(qb, g), g) > 2 ) ) ) ;
+  bool lBottomIsTriangle       = lBottomFaceExists && is_triangle(qp,g);
+  bool lTopIsTriangle          = lTopFaceExists && is_triangle(pq,g);

  vertex_descriptor q = target(pq, g);
  vertex_descriptor p = source(pq, g);
@ -1585,7 +1584,7 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor e,

  bool lP_Erased = false;

-  if ( lTopFaceExists )
+  if ( lTopIsTriangle)
  {
    CGAL_precondition( ! is_border(opposite(pt, g),g) ) ; // p-q-t is a face of the mesh
    if ( lTopLeftFaceExists )
@ -1612,7 +1611,7 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor e,
    }
  }

-  if ( lBottomFaceExists )
+  if ( lBottomIsTriangle)
  {
    CGAL_precondition( ! is_border(opposite(qb, g),g) ) ; // p-q-b is a face of the mesh
    if ( lBottomRightFaceExists )
@ -1659,7 +1658,7 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor e,
 * collapses an edge in a graph having non-collapsable edges.
 *
 * Let `h` be the halfedge of `e`, and let `v0` and `v1` be the source and target vertices of `h`.
- * Collapses the edge `e` replacing it with `v1`, as described in the paragraph above
+ * Collapses the edge `e` replacing it with `v1`, as described in the other overload
 * and guarantees that an edge `e2`, for which `get(edge_is_constrained_map, e2)==true`,
 * is not removed after the collapse.
 *
@ -1669,14 +1668,14 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor e,
 *
 * \returns vertex `v1`.
 * \pre This function requires `g` to be an oriented 2-manifold with or without boundaries.
- *       Furthermore, the edge `v0v1` must satisfy the link condition, which guarantees that the surface mesh is also 2-manifold after the edge collapse.
- * \pre `get(edge_is_constrained_map, v0v1)==false`.
+ *       Furthermore, the edge `e` must satisfy the link condition, which guarantees that the surface mesh is also 2-manifold after the edge collapse.
+ * \pre `get(edge_is_constrained_map, e)==false`.
 * \pre  `v0` and `v1` are not both incident to a constrained edge.
 */

 template<typename Graph, typename EdgeIsConstrainedMap>
 typename boost::graph_traits<Graph>::vertex_descriptor
-collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor v0v1,
+collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor e,
              Graph& g,
              EdgeIsConstrainedMap Edge_is_constrained_map)
 {
@ -1684,11 +1683,11 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor v0v1,
  typedef typename Traits::vertex_descriptor          vertex_descriptor;
  typedef typename Traits::halfedge_descriptor            halfedge_descriptor;

-  CGAL_precondition(is_valid_edge_descriptor(v0v1, g));
-  CGAL_precondition(does_satisfy_link_condition(v0v1,g));
-  CGAL_precondition(!get(Edge_is_constrained_map, v0v1));
+  CGAL_precondition(is_valid_edge_descriptor(e, g));
+  CGAL_precondition(does_satisfy_link_condition(e,g));
+  CGAL_precondition(!get(Edge_is_constrained_map, e));

-  halfedge_descriptor pq = halfedge(v0v1,g);
+  halfedge_descriptor pq = halfedge(e,g);

  halfedge_descriptor qp = opposite(pq,g);
  halfedge_descriptor pt = opposite(prev(pq,g),g);
@ -1698,6 +1697,8 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor v0v1,

  bool lTopFaceExists         = ! is_border(pq,g) ;
  bool lBottomFaceExists      = ! is_border(qp,g) ;
+  bool lTopIsTriangle          = lTopFaceExists && is_triangle(pq,g);
+  bool lBottomIsTriangle       = lBottomFaceExists && is_triangle(qp,g);

  vertex_descriptor q = target(pq,g);
  vertex_descriptor p = source(pq,g);
@ -1708,7 +1709,7 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor v0v1,

  // If the top facet exists, we need to choose one out of the two edges which one disappears:
  //   p-t if it is not constrained and t-q otherwise
-  if ( lTopFaceExists )
+  if ( lTopIsTriangle )
  {
    if ( !get(Edge_is_constrained_map,edge(pt,g)) )
    {
@ -1722,7 +1723,7 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor v0v1,

  // If the bottom facet exists, we need to choose one out of the two edges which one disappears:
  //   q-b if it is not constrained and b-p otherwise
-  if ( lBottomFaceExists )
+  if ( lBottomIsTriangle )
  {
    if ( !get(Edge_is_constrained_map,edge(qb,g)) )
    {
@ -1733,7 +1734,7 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor v0v1,
    }
  }

-  if (lTopFaceExists && lBottomFaceExists)
+  if (lTopIsTriangle && lBottomIsTriangle)
  {
    if ( face(edges_to_erase[0],g) == face(edges_to_erase[1],g)
         && (! is_border(edges_to_erase[0],g)) )
@ -1780,7 +1781,7 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor v0v1,
  }
  else
  {
-    if (lTopFaceExists)
+    if (lTopIsTriangle)
    {
      if (!(is_border(edges_to_erase[0],g))){
        join_face(edges_to_erase[0],g);
@ -1795,21 +1796,32 @@ collapse_edge(typename boost::graph_traits<Graph>::edge_descriptor v0v1,
      remove_face(opposite(edges_to_erase[0],g),g);
      return q;
    }
-
-    if (! (is_border(edges_to_erase[0],g))){
-      // q will be removed, swap it with p
-      internal::swap_vertices(p, q, g);
-      join_face(edges_to_erase[0],g);
-      join_vertex(qp,g);
-      return q;
-    }
-    if(!is_border(opposite(next(qp,g),g),g))
+    else
    {
-      // q will be removed, swap it with p
-      internal::swap_vertices(p, q, g);
+      if (lBottomIsTriangle)
+      {
+        if (! (is_border(edges_to_erase[0],g))){
+          // q will be removed, swap it with p
+          internal::swap_vertices(p, q, g);
+          join_face(edges_to_erase[0],g);
+          CGAL_assertion(source(qp,g)==p);
+          join_vertex(qp,g);
+          return q;
+        }
+        if(!is_border(opposite(next(qp,g),g),g))
+        {
+          // q will be removed, swap it with p
+          internal::swap_vertices(p, q, g);
+        }
+        remove_face(opposite(edges_to_erase[0],g),g);
+        return q;
+      }
+      else
+      {
+        join_vertex(pq,g);
+        return q;
+      }
    }
-    remove_face(opposite(edges_to_erase[0],g),g);
-    return q;
  }
 }

--- a/BGL/test/BGL/data/polygon_mesh_to_collapse.off
+++ b/BGL/test/BGL/data/polygon_mesh_to_collapse.off
@ -0,0 +1,42 @@
+OFF
+25 13 0
+
+0.39160239696502686 1.3864846229553223 4.8046874923102223e-08
+0.053782559931278229 1.3864846229553223 4.8046874923102223e-08
+-0.94644606113433838 1.6651756763458252 4.8046874923102223e-08
+-1.3082554340362549 1.7385153770446777 4.8046874923102223e-08
+-1.3033660650253296 1.1860226392745972 4.8046874923102223e-08
+1.61628258228302 -0.17601536214351654 4.8046874923102223e-08
+0.55834579467773438 -0.19216139614582062 4.8046874923102223e-08
+0.053782559931278229 -0.17601536214351654 4.8046874923102223e-08
+-0.24240998923778534 -0.22679123282432556 4.8046874923102223e-08
+-0.58168435096740723 -0.25845989584922791 4.8046874923102223e-08
+-1.2915089130401611 -0.17601536214351654 4.8046874923102223e-08
+-1.50871741771698 -0.17601536214351654 4.8046874923102223e-08
+1.61628258228302 -1.7385153770446777 4.8046874923102223e-08
+1.1978726387023926 -1.7385153770446777 4.8046874923102223e-08
+0.71942150592803955 -1.7385153770446777 4.8046874923102223e-08
+0.053782559931278229 -1.7385153770446777 4.8046874923102223e-08
+-0.73973840475082397 -1.7385153770446777 4.8046874923102223e-08
+1.61628258228302 0.36264327168464661 4.8046874923102223e-08
+-0.26156377792358398 0.45463424921035767 4.8046874923102223e-08
+-0.028661971911787987 -0.78840988874435425 4.8046874923102223e-08
+0.053782559931278229 -1.2213115692138672 4.8046874923102223e-08
+-1.5918357372283936 1.5331641435623169 4.8046874923102223e-08
+-1.6162823438644409 0.87338578701019287 4.8046874923102223e-08
+-1.50871741771698 -0.0072435899637639523 4.8046874923102223e-08
+-1.50871741771698 -1.3000825643539429 4.8046874923102223e-08
+7  18 2 3 4 22 9 8
+3  2 18 1
+7  18 7 6 5 17 0 1
+7  12 5 6 7 8 19 13
+6  11 24 16 15 20 10
+3  9 19 8
+4  10 20 19 9
+3  7 18 8
+3  14 20 15
+4  13 19 20 14
+3  3 21 4
+4  9 22 23 10
+3  10 23 11
+
--- a/BGL/test/BGL/test_Collapse_edge.cpp
+++ b/BGL/test/BGL/test_Collapse_edge.cpp
@ -2,7 +2,6 @@

 #include <CGAL/boost/graph/Euler_operations.h>
 #include <CGAL/boost/graph/IO/OFF.h>
-
 #include <boost/range/distance.hpp>

 #include <string>
@ -213,12 +212,30 @@ collapse_edge_test()
    assert(found == 2);
    CGAL::clear(test_mesh);
  }
+  // Case 6 non pure triangle mesh
+  {
+    Mesh ref;
+    if(!CGAL::IO::read_OFF("data/polygon_mesh_to_collapse.off", ref))
+    {
+      std::cout << "Error reading file: data/polygon_mesh_to_collapse.off" << std::endl;
+      exit(1);
+    }
+    std::size_t nbe=halfedges(ref).size();
+    for (std::size_t i=0; i< nbe; ++i)
+    {
+      Mesh m = ref;
+      auto h = *std::next(halfedges(m).begin(), i);
+
+      if (CGAL::Euler::does_satisfy_link_condition(edge(h,m),m))
+        CGAL::Euler::collapse_edge(edge(h,m), m);
+      assert(CGAL::is_valid_polygon_mesh(m));
+    }
+  }
 }


 int main()
 {
-
  collapse_edge_test<Polyhedron>();
  collapse_edge_test<SM>();

--- a/Barycentric_coordinates_2/benchmark/Barycentric_coordinates_2/CMakeLists.txt
+++ b/Barycentric_coordinates_2/benchmark/Barycentric_coordinates_2/CMakeLists.txt
@ -14,8 +14,9 @@ create_single_source_cgal_program("benchmark_polygon_16_vertices.cpp")
 create_single_source_cgal_program("benchmark_polygon_100_vertices.cpp")
 create_single_source_cgal_program("benchmark_mv_34_vertices.cpp")

-find_package(Eigen3 3.1.0 QUIET) # (3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("benchmark_hm_4_vertices.cpp")
  target_link_libraries(benchmark_hm_4_vertices PUBLIC CGAL::Eigen3_support)
--- a/Barycentric_coordinates_2/examples/Barycentric_coordinates_2/CMakeLists.txt
+++ b/Barycentric_coordinates_2/examples/Barycentric_coordinates_2/CMakeLists.txt
@ -17,8 +17,9 @@ create_single_source_cgal_program("terrain_height_modeling.cpp")
 # this code is deprecated:
 create_single_source_cgal_program("deprecated_coordinates.cpp")

-find_package(Eigen3 3.1.0 QUIET) # (3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("affine_coordinates.cpp")
  target_link_libraries(affine_coordinates PUBLIC CGAL::Eigen3_support)
--- a/Barycentric_coordinates_2/test/Barycentric_coordinates_2/CMakeLists.txt
+++ b/Barycentric_coordinates_2/test/Barycentric_coordinates_2/CMakeLists.txt
@ -42,8 +42,9 @@ create_single_source_cgal_program("test_wp_deprecated_api.cpp")
 create_single_source_cgal_program("test_mv_deprecated_api.cpp")
 create_single_source_cgal_program("test_dh_deprecated_api.cpp")

-find_package(Eigen3 3.1.0 QUIET) # (3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("test_hm_unit_square.cpp")
  target_link_libraries(test_hm_unit_square PUBLIC CGAL::Eigen3_support)
--- a/Basic_viewer/examples/Basic_viewer/CMakeLists.txt
+++ b/Basic_viewer/examples/Basic_viewer/CMakeLists.txt
@ -11,7 +11,7 @@ project(Basic_viewer_Examples)

 #CGAL_Qt6 is needed for the drawing.
 find_package(CGAL REQUIRED OPTIONAL_COMPONENTS Qt6)
-find_package(Eigen3 3.1.0)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)

 create_single_source_cgal_program("draw_lcc.cpp")
--- a/Bounding_volumes/examples/Approximate_min_ellipsoid_d/CMakeLists.txt
+++ b/Bounding_volumes/examples/Approximate_min_ellipsoid_d/CMakeLists.txt
@ -4,7 +4,7 @@ project(Approximate_min_ellipsoid_d_Examples)
 find_package(CGAL REQUIRED)

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)

 # create a target per cppfile
--- a/Bounding_volumes/test/Bounding_volumes/CMakeLists.txt
+++ b/Bounding_volumes/test/Bounding_volumes/CMakeLists.txt
@ -7,7 +7,7 @@ project(Bounding_volumes_Tests)
 find_package(CGAL REQUIRED COMPONENTS Core)

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)

 # create a target per cppfile
--- a/CGAL_ipelets/demo/CGAL_ipelets/CMakeLists.txt
+++ b/CGAL_ipelets/demo/CGAL_ipelets/CMakeLists.txt
@ -20,8 +20,9 @@ set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}")

 find_package(CGAL REQUIRED COMPONENTS Core)

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires the Eigen library, and will not be compiled.")
  return()
--- a/Classification/examples/Classification/CMakeLists.txt
+++ b/Classification/examples/Classification/CMakeLists.txt
@ -23,8 +23,9 @@ if(NOT TARGET CGAL::Boost_iostreams_support)
  set(Classification_dependencies_met FALSE)
 endif()

-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires the Eigen library, and will not be compiled.")
  set(Classification_dependencies_met FALSE)
--- a/Classification/test/Classification/CMakeLists.txt
+++ b/Classification/test/Classification/CMakeLists.txt
@ -23,8 +23,9 @@ if(NOT TARGET CGAL::Boost_iostreams_support)
  set(Classification_dependencies_met FALSE)
 endif()

-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires the Eigen library, and will not be compiled.")
  set(Classification_dependencies_met FALSE)
--- a/Documentation/doc/Documentation/Third_party.txt
+++ b/Documentation/doc/Documentation/Third_party.txt
@ -117,14 +117,14 @@ Qt is a cross-platform application and UI framework.
 The component `CGAL_Qt6` is essential to run the \cgal demos and basic viewers.
 It requires \qt6 installed on your system.
 In case \qt is not yet installed on your system, you can download
-it from <A HREF="https://www.qt-project.org/">`https://www.qt-project.org/`</A>.
+it from <A HREF="https://contribute.qt-project.org/">`https://contribute.qt-project.org/`</A>.

 The exhaustive list of \qt6 components used in demos is:
 `Core`, `Gui`, `Help`, `OpenGL`, `OpenGLWidgets`, `Qml`, `Svg`, `Widgets`,
 `WebSockets`,  `Network`, and `qcollectiongenerator` (with `sqlite` driver plugin).

 \subsection thirdpartyEigen Eigen
-<b>Version 3.3.7 or later</b>
+<b>Version 3.3.7 or later (including Eigen3 5.0.0)</b>

 \eigen is a `C++` template library for linear algebra. \eigen supports all
 matrix sizes, various matrix decomposition methods and sparse linear solvers.
@ -138,7 +138,7 @@ Overview</a> page. In order to use Eigen in \cgal programs, the
 executables should be linked with the CMake imported target
 `CGAL::Eigen3_support` provided in `CGAL_Eigen3_support.cmake`.

-The \eigen web site is <A HREF="https://eigen.tuxfamily.org/index.php?title=Main_Page">`https://eigen.tuxfamily.org`</A>.
+The \eigen web site is <A HREF="https://libeigen.gitlab.io/">`https://libeigen.gitlab.io/`</A>.

 \subsection thirdpartyOpenGR OpenGR

@ -167,17 +167,6 @@ Alternatively, version 1.3.1 of \libpointmatcher is supported with version 3.3.7
 `https://github.com/ethz-asl/libpointmatcher/blob/master/doc/Compilation.md`:`NABO_INCLUDE_DIR` becomes `libnabo_INCLUDE_DIRS`
 and `NABO_LIBRARY` becomes `libnabo_LIBRARIES` in the "Build libpointmatcher" section.

-\subsection thirdpartyLeda LEDA
-<b>Version 6.2 or later</b>
-
-\leda is a library of efficient data structures and
-algorithms. Like \core, \leda offers a real number data type.
-
-In \cgal this library is optional, and its number types can
-be used as an alternative to \gmp, \mpfr, and \core.
-
-Free and commercial editions of \leda are available from <A HREF="https://www.algorithmic-solutions.com">`https://www.algorithmic-solutions.com`</A>.
-
 \subsection thirdpartyMPFI Multiple Precision Floating-point Interval (MPFI)
 <b>Version 1.4 or later</b>

@ -278,7 +267,7 @@ vcpkg install suitesparse
 \subsection thirdpartyMETIS METIS
 <b>Version 5.1 or later</b>

-\metis is a library developed by the <A HREF="http://glaros.dtc.umn.edu/gkhome/">Karypis Lab</A>
+\metis is a library developed by the <A HREF="https://github.com/KarypisLab/">Karypis Lab</A>
 and designed to partition graphs and produce fill-reducing matrix orderings.

 \cgal offers wrappers around some of the methods of the \metis library
@ -287,7 +276,7 @@ to allow the partitioning of graphs that are models of the concepts of the
 and, by extension, of surface meshes (see Section \ref BGLPartitioning of the package \ref PkgBGL).

 More information is available on the METIS library
-at <A HREF="http://glaros.dtc.umn.edu/gkhome/metis/metis/overview">`http://glaros.dtc.umn.edu/gkhome/metis/metis/overview`</A>.
+at <A HREF="https://github.com/KarypisLab/METIS">`https://github.com/KarypisLab/METIS`</A>.

 \subsection thirdpartyzlib zlib

--- a/Generator/examples/Generator/CMakeLists.txt
+++ b/Generator/examples/Generator/CMakeLists.txt
@ -28,8 +28,9 @@ create_single_source_cgal_program("random_segments1.cpp")
 create_single_source_cgal_program("random_segments2.cpp")
 create_single_source_cgal_program("sphere_d.cpp")

-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("random_points_in_tetrahedral_mesh_3.cpp")
  target_link_libraries(random_points_in_tetrahedral_mesh_3 PRIVATE CGAL::Eigen3_support)
--- a/Generator/test/Generator/CMakeLists.txt
+++ b/Generator/test/Generator/CMakeLists.txt
@ -15,8 +15,9 @@ create_single_source_cgal_program("test_tetrahedron_3.cpp")
 create_single_source_cgal_program("test_triangle_2.cpp")
 create_single_source_cgal_program("test_triangle_3.cpp")

-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("generic_random_test.cpp")
  target_link_libraries(generic_random_test PRIVATE CGAL::Eigen3_support)
--- a/GraphicsView/demo/Bounding_volumes/CMakeLists.txt
+++ b/GraphicsView/demo/Bounding_volumes/CMakeLists.txt
@ -8,7 +8,7 @@ find_package(CGAL REQUIRED OPTIONAL_COMPONENTS Qt6)

 find_package(Qt6 QUIET COMPONENTS Widgets)

-find_package(Eigen3 3.1.91 QUIET) #(requires 3.1.91 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)

 if(NOT TARGET CGAL::Eigen3_support)
--- a/GraphicsView/demo/Polygon/CMakeLists.txt
+++ b/GraphicsView/demo/Polygon/CMakeLists.txt
@ -6,8 +6,9 @@ project(Polygon_Demo)

 find_package(CGAL REQUIRED OPTIONAL_COMPONENTS Qt6 Core)

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This demo requires the Eigen library, and will not be compiled.")
  return()
--- a/GraphicsView/include/CGAL/Qt/DemosMainWindow_impl.h
+++ b/GraphicsView/include/CGAL/Qt/DemosMainWindow_impl.h
@ -221,7 +221,10 @@ void
 DemosMainWindow::popupAboutBox(QString title, QString html_resource_name)
 {
  QFile about_CGAL(html_resource_name);
-  about_CGAL.open(QIODevice::ReadOnly);
+  if (!about_CGAL.open(QIODevice::ReadOnly)) {
+    QMessageBox::warning(this, tr("Error"), tr("Could not open resource file: %1").arg(html_resource_name));
+    return;
+  }
  QString about_CGAL_txt = QTextStream(&about_CGAL).readAll();
 #ifdef CGAL_VERSION_STR
  QString cgal_version(CGAL_VERSION_STR);
--- a/Heat_method_3/examples/Heat_method_3/CMakeLists.txt
+++ b/Heat_method_3/examples/Heat_method_3/CMakeLists.txt
@ -7,8 +7,9 @@ project(Heat_method_3_Examples)
 # CGAL and its components
 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.3.0 QUIET)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: These examples require the Eigen library (3.3 or greater), and will not be compiled.")
  return()
--- a/Heat_method_3/test/Heat_method_3/CMakeLists.txt
+++ b/Heat_method_3/test/Heat_method_3/CMakeLists.txt
@ -7,8 +7,9 @@ project(Heat_method_3_Tests)
 # CGAL and its components
 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.3.0 QUIET)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: These tests require the  Eigen library (3.3 or greater), and will not be compiled.")
  return()
--- a/Installation/cmake/modules/CGAL_Ceres_support.cmake
+++ b/Installation/cmake/modules/CGAL_Ceres_support.cmake
@ -3,5 +3,5 @@ if(CERES_FOUND AND NOT TARGET CGAL::Ceres_support)
  set_target_properties(CGAL::Ceres_support PROPERTIES
    INTERFACE_COMPILE_DEFINITIONS "CGAL_PMP_USE_CERES_SOLVER"
    INTERFACE_INCLUDE_DIRECTORIES "${CERES_INCLUDE_DIRS}"
-    INTERFACE_LINK_LIBRARIES "ceres")
+    INTERFACE_LINK_LIBRARIES "Ceres::ceres")
 endif()
--- a/Installation/cmake/modules/CGAL_Eigen3_support.cmake
+++ b/Installation/cmake/modules/CGAL_Eigen3_support.cmake
@ -1,3 +1,10 @@
+if((EIGEN3_FOUND OR Eigen3_FOUND) AND NOT TARGET CGAL::Eigen3_support)
+  if ("${Eigen3_VERSION}" VERSION_LESS "3.3.7")
+    set (EIGEN3_FOUND 0)
+    find_package(Eigen3 3.3.7 QUIET) # (3.3.7 or greater)
+  endif()
+endif()
+
 if((EIGEN3_FOUND OR Eigen3_FOUND) AND NOT TARGET CGAL::Eigen3_support)
  if(NOT TARGET Threads::Threads)
    find_package(Threads REQUIRED)
--- a/Jet_fitting_3/examples/Jet_fitting_3/CMakeLists.txt
+++ b/Jet_fitting_3/examples/Jet_fitting_3/CMakeLists.txt
@ -7,8 +7,9 @@ project(Jet_fitting_3_Examples)
 find_package(CGAL REQUIRED)

 # use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)

  # Link with Boost.ProgramOptions (optional)
--- a/Jet_fitting_3/test/Jet_fitting_3/CMakeLists.txt
+++ b/Jet_fitting_3/test/Jet_fitting_3/CMakeLists.txt
@ -7,8 +7,9 @@ project(Jet_fitting_3_Tests)
 find_package(CGAL REQUIRED)

 # use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("blind_1pt.cpp")
  target_link_libraries(blind_1pt PUBLIC CGAL::Eigen3_support)
--- a/Kinetic_space_partition/examples/Kinetic_space_partition/CMakeLists.txt
+++ b/Kinetic_space_partition/examples/Kinetic_space_partition/CMakeLists.txt
@ -8,7 +8,7 @@ project(Kinetic_space_partition_Examples)
 find_package(CGAL REQUIRED)
 include(CGAL_CreateSingleSourceCGALProgram)

-find_package(Eigen3 3.1.0 REQUIRED)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)

 if(TARGET CGAL::Eigen3_support)
--- a/Kinetic_space_partition/test/Kinetic_space_partition/CMakeLists.txt
+++ b/Kinetic_space_partition/test/Kinetic_space_partition/CMakeLists.txt
@ -8,7 +8,7 @@ project(Kinetic_space_partition_Tests)
 find_package(CGAL REQUIRED)
 include(CGAL_CreateSingleSourceCGALProgram)

-find_package(Eigen3 3.1.0 REQUIRED)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)

 if(TARGET CGAL::Eigen3_support)
--- a/Kinetic_surface_reconstruction/examples/Kinetic_surface_reconstruction/CMakeLists.txt
+++ b/Kinetic_surface_reconstruction/examples/Kinetic_surface_reconstruction/CMakeLists.txt
@ -8,7 +8,7 @@ project(Kinetic_surface_reconstruction_Examples)
 find_package(CGAL REQUIRED)
 include(CGAL_CreateSingleSourceCGALProgram)

-find_package(Eigen3 3.1.0 REQUIRED)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)

 if(TARGET CGAL::Eigen3_support)
--- a/Kinetic_surface_reconstruction/test/Kinetic_surface_reconstruction/CMakeLists.txt
+++ b/Kinetic_surface_reconstruction/test/Kinetic_surface_reconstruction/CMakeLists.txt
@ -8,7 +8,7 @@ project(Kinetic_surface_reconstruction_Tests)
 find_package(CGAL REQUIRED)
 include(CGAL_CreateSingleSourceCGALProgram)

-find_package(Eigen3 3.1.0 REQUIRED)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)

 if(TARGET CGAL::Eigen3_support)
--- a/Lab/demo/Lab/CMakeLists.txt
+++ b/Lab/demo/Lab/CMakeLists.txt
@ -52,12 +52,14 @@ if(Qt6_FOUND)
  add_definitions(-DSCENE_IMAGE_GL_BUFFERS_AVAILABLE)
 endif(Qt6_FOUND)

-find_package(Eigen3 3.2.0 QUIET) #(requires 3.2.0 or greater)
+find_package(Eigen3 QUIET)
+include(CGAL_Eigen3_support)
+
 set_package_properties(
  Eigen3 PROPERTIES
  DESCRIPTION "A library for linear algebra."
  PURPOSE "Required for most plugins (Meshing, Mesh and Point Set Processing, etc.).")
-include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message(STATUS "NOTICE: Eigen was not found.")
 endif()
--- a/Lab/demo/Lab/Plugins/Mesh_3/CMakeLists.txt
+++ b/Lab/demo/Lab/Plugins/Mesh_3/CMakeLists.txt
@ -79,8 +79,9 @@ target_link_libraries(
         scene_implicit_function_item)

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  target_link_libraries(mesh_3_optimization_plugin PUBLIC CGAL::Eigen3_support)
 else()
--- a/Lab/demo/Lab/Plugins/Surface_mesh_deformation/CMakeLists.txt
+++ b/Lab/demo/Lab/Plugins/Surface_mesh_deformation/CMakeLists.txt
@ -1,6 +1,6 @@
 include(CGALlab_macros)

-if(TARGET CGAL::Eigen3_support AND "${Eigen3_VERSION}" VERSION_GREATER "3.1.90")
+if(TARGET CGAL::Eigen3_support)

  qt6_wrap_ui(editionUI_FILES Deform_mesh.ui)
  add_item(scene_edit_item
--- a/Lab/demo/Lab/Plugins/Tetrahedral_remeshing/CMakeLists.txt
+++ b/Lab/demo/Lab/Plugins/Tetrahedral_remeshing/CMakeLists.txt
@ -14,7 +14,7 @@ cgal_lab_plugin(
 target_link_libraries(tetrahedral_remeshing_plugin PUBLIC scene_c3t3_item
                                                          ${OPENGL_gl_LIBRARY})

-find_package(Eigen3 3.1.0 REQUIRED) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
 if(TARGET CGAL::Eigen3_support)
  target_link_libraries(tetrahedral_remeshing_plugin PUBLIC CGAL::Eigen3_support)
--- a/Mesh_3/examples/Mesh_3/CMakeLists.txt
+++ b/Mesh_3/examples/Mesh_3/CMakeLists.txt
@ -19,8 +19,9 @@ if(CGAL_ACTIVATE_CONCURRENT_MESH_3 OR "$ENV{CGAL_ACTIVATE_CONCURRENT_MESH_3}")
 endif()

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: All examples require the Eigen3 library, and will not be compiled.")
  return()
--- a/Mesh_3/test/Mesh_3/CMakeLists.txt
+++ b/Mesh_3/test/Mesh_3/CMakeLists.txt
@ -7,8 +7,9 @@ project( Mesh_3_Tests )
 find_package(CGAL REQUIRED COMPONENTS ImageIO)

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if (NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires the Eigen library, and will not be compiled.")
  return()
--- a/NewKernel_d/test/NewKernel_d/CMakeLists.txt
+++ b/NewKernel_d/test/NewKernel_d/CMakeLists.txt
@ -14,6 +14,7 @@ find_package(CGAL REQUIRED)

 find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  file(
    GLOB cppfiles
--- a/Number_types/test/Number_types/CMakeLists.txt
+++ b/Number_types/test/Number_types/CMakeLists.txt
@ -80,8 +80,10 @@ if(NOT CGAL_DISABLE_GMP)
  create_single_source_cgal_program( "Gmpfi.cpp" )
  create_single_source_cgal_program( "Gmpfr_bug.cpp" )
  create_single_source_cgal_program( "test_eigen.cpp" )
-  find_package(Eigen3 3.2.0 QUIET) #(requires 3.2.0 or greater)
+
+  find_package(Eigen3 QUIET)
  include(CGAL_Eigen3_support)
+
  if (TARGET CGAL::Eigen3_support)
    target_link_libraries(test_eigen PUBLIC CGAL::Eigen3_support)
  endif()
--- a/Optimal_bounding_box/benchmark/Optimal_bounding_box/CMakeLists.txt
+++ b/Optimal_bounding_box/benchmark/Optimal_bounding_box/CMakeLists.txt
@ -7,8 +7,9 @@ project(Optimal_bounding_box_Benchmark)
 # CGAL and its components
 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires the Eigen library, and will not be compiled.")
  return()
--- a/Optimal_bounding_box/examples/Optimal_bounding_box/CMakeLists.txt
+++ b/Optimal_bounding_box/examples/Optimal_bounding_box/CMakeLists.txt
@ -6,8 +6,9 @@ project(Optimal_bounding_box_Examples)

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires the Eigen library, and will not be compiled.")
  return()
--- a/Optimal_bounding_box/test/Optimal_bounding_box/CMakeLists.txt
+++ b/Optimal_bounding_box/test/Optimal_bounding_box/CMakeLists.txt
@ -6,8 +6,9 @@ project(Optimal_bounding_box_Tests)

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires the Eigen library, and will not be compiled.")
  return()
--- a/Optimal_transportation_reconstruction_2/include/CGAL/OTR_2/Reconstruction_face_base_2.h
+++ b/Optimal_transportation_reconstruction_2/include/CGAL/OTR_2/Reconstruction_face_base_2.h
@ -17,6 +17,8 @@

 #include <CGAL/OTR_2/Cost.h>
 #include <CGAL/Triangulation_face_base_2.h>
+#include <CGAL/Has_timestamp.h>
+#include <CGAL/Time_stamper.h>

 #include <vector>

@ -62,6 +64,8 @@ private:

  FT m_relevance[3];

+  std::size_t time_stamp_ = std::size_t(-2);
+
 public:
  Reconstruction_face_base_2()
  {
@ -190,6 +194,18 @@ public:
    for (int i = 0; i < 3; ++i)
      clean_samples(i);
  }
+
+  /// For the determinism of Compact_container iterators
+  ///@{
+  typedef Tag_true Has_timestamp;
+
+  std::size_t time_stamp() const {
+    return time_stamp_;
+  }
+  void set_time_stamp(const std::size_t& ts) {
+    time_stamp_ = ts;
+  }
+  ///@}
 };

 //---------------STRUCT LESS FACE_HANDLE---------------------
--- a/Optimal_transportation_reconstruction_2/include/CGAL/OTR_2/Reconstruction_vertex_base_2.h
+++ b/Optimal_transportation_reconstruction_2/include/CGAL/OTR_2/Reconstruction_vertex_base_2.h
@ -16,6 +16,8 @@


 #include <CGAL/Triangulation_vertex_base_2.h>
+#include <CGAL/Has_timestamp.h>
+#include <CGAL/Time_stamper.h>
 #include <CGAL/OTR_2/Sample.h>

 namespace CGAL {
@ -53,6 +55,7 @@ private:
  int       m_sample;
  Point     m_relocated;
  FT        m_relevance;
+  std::size_t time_stamp_ = std::size_t(-2);


 public:
@ -110,6 +113,18 @@ public:
  Point& relocated() { return m_relocated; }

  bool  has_sample_assigned() const { return sample() != -1; }
+
+  /// For the determinism of Compact_container iterators
+  ///@{
+  typedef Tag_true Has_timestamp;
+
+  std::size_t time_stamp() const {
+    return time_stamp_;
+  }
+  void set_time_stamp(const std::size_t& ts) {
+    time_stamp_ = ts;
+  }
+  ///@}
 };
 //---------------STRUCT LESS VERTEX_HANDLE---------------------
 template <class T>
--- a/Orthtree/examples/Orthtree/CMakeLists.txt
+++ b/Orthtree/examples/Orthtree/CMakeLists.txt
@ -18,8 +18,9 @@ create_single_source_cgal_program("quadtree_build_from_point_vector.cpp")
 create_single_source_cgal_program("octree_surface_mesh.cpp")
 create_single_source_cgal_program("quadtree_build_manually.cpp")

-find_package(Eigen3 3.1.91 QUIET) #(requires 3.1.91 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if (TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("orthtree_build.cpp")
  target_link_libraries(orthtree_build PUBLIC CGAL::Eigen3_support)
--- a/Periodic_3_mesh_3/examples/Periodic_3_mesh_3/CMakeLists.txt
+++ b/Periodic_3_mesh_3/examples/Periodic_3_mesh_3/CMakeLists.txt
@ -8,8 +8,9 @@ project(Periodic_3_mesh_3_Examples)
 find_package(CGAL REQUIRED)

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires the Eigen library, and will not be compiled.")
  return()
--- a/Periodic_3_mesh_3/test/Periodic_3_mesh_3/CMakeLists.txt
+++ b/Periodic_3_mesh_3/test/Periodic_3_mesh_3/CMakeLists.txt
@ -7,8 +7,9 @@ project(Periodic_3_mesh_3_Tests)
 find_package(CGAL REQUIRED COMPONENTS ImageIO)

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires the Eigen library, and will not be compiled.")
  return()
--- a/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/MainWindow.h
+++ b/Periodic_3_triangulation_3/demo/Periodic_3_triangulation_3/MainWindow.h
@ -138,7 +138,12 @@ public Q_SLOTS:
 private:
  void showFileBox(QString title, QString fileName) {
    QFile textFile(fileName);
-    textFile.open(QIODevice::ReadOnly);
+    bool b = textFile.open(QIODevice::ReadOnly);
+    if(!b){
+      QMessageBox::critical(this, tr("Error"),
+          tr("Could not open file %1.").arg(fileName));
+      return;
+    }
    QMessageBox mb(QMessageBox::NoIcon,
        title,
        QTextStream(&textFile).readAll(),
--- a/Point_set_3/examples/Point_set_3/CMakeLists.txt
+++ b/Point_set_3/examples/Point_set_3/CMakeLists.txt
@ -13,8 +13,9 @@ create_single_source_cgal_program("point_set_read_xyz.cpp")
 create_single_source_cgal_program("point_set_advanced.cpp")
 create_single_source_cgal_program("point_set_read_ply.cpp")

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("point_set_algo.cpp")
  target_link_libraries(point_set_algo PUBLIC CGAL::Eigen3_support)
--- a/Point_set_processing_3/examples/Point_set_processing_3/CMakeLists.txt
+++ b/Point_set_processing_3/examples/Point_set_processing_3/CMakeLists.txt
@ -67,8 +67,9 @@ else()
 endif()

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)

  # Executables that require Eigen
--- a/Point_set_processing_3/test/Point_set_processing_3/CMakeLists.txt
+++ b/Point_set_processing_3/test/Point_set_processing_3/CMakeLists.txt
@ -47,8 +47,9 @@ else()
 endif()

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  # Executables that require Eigen
  create_single_source_cgal_program( "normal_estimation_test.cpp" )
--- a/Poisson_surface_reconstruction_3/examples/Poisson_surface_reconstruction_3/CMakeLists.txt
+++ b/Poisson_surface_reconstruction_3/examples/Poisson_surface_reconstruction_3/CMakeLists.txt
@ -21,9 +21,10 @@ endif()
 # Activate Parallelism in Mesh_3
 option(CGAL_ACTIVATE_CONCURRENT_MESH_3 "Activate parallelism in Mesh_3" OFF)

-# Find Eigen3 (requires 3.1.0 or greater)
-find_package(Eigen3 3.1.0 QUIET)
+# Find Eigen3
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  # Executables that require Eigen 3
  create_single_source_cgal_program("poisson_reconstruction_example.cpp")
--- a/Poisson_surface_reconstruction_3/test/Poisson_surface_reconstruction_3/CMakeLists.txt
+++ b/Poisson_surface_reconstruction_3/test/Poisson_surface_reconstruction_3/CMakeLists.txt
@ -18,7 +18,7 @@ if(MSVC)
  message(STATUS "USING RELEASE EXEFLAGS = '${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_EXE_LINKER_FLAGS_RELEASE}'")
 endif()

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
 if(TARGET CGAL::Eigen3_support)
  # Executables that require Eigen 3.1
--- a/Polygon_mesh_processing/benchmark/Polygon_mesh_processing/CMakeLists.txt
+++ b/Polygon_mesh_processing/benchmark/Polygon_mesh_processing/CMakeLists.txt
@ -7,8 +7,9 @@ project(Polygon_mesh_processing)
 # CGAL and its components
 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.2.0 QUIET) #(requires 3.2.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: Benchmarks require Eigen 3.2 (or greater), and will not be compiled")
  return()
--- a/Polygon_mesh_processing/examples/Polygon_mesh_processing/CMakeLists.txt
+++ b/Polygon_mesh_processing/examples/Polygon_mesh_processing/CMakeLists.txt
@ -59,8 +59,9 @@ create_single_source_cgal_program("isotropic_remeshing_with_allow_move.cpp")
 create_single_source_cgal_program("triangle_mesh_autorefinement.cpp")
 create_single_source_cgal_program("soup_autorefinement.cpp")

-find_package(Eigen3 3.2.0 QUIET) #(requires 3.2.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("hole_filling_example.cpp")
  target_link_libraries(hole_filling_example PUBLIC CGAL::Eigen3_support)
--- a/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/Triangulate_hole_polyline.h
+++ b/Polygon_mesh_processing/include/CGAL/Polygon_mesh_processing/internal/Hole_filling/Triangulate_hole_polyline.h
@ -1447,6 +1447,12 @@ triangulate_hole_polyline_with_cdt(const PointRange& points,
    vertices[v->info()] = v;
  }

+  if (vertices.size()!=cdt.number_of_vertices())
+  {
+    visitor.end_planar_phase(false);
+    return false;
+  }
+
  try
  {
    for (std::size_t i = 0; i < size; ++i) {
--- a/Polygon_mesh_processing/test/Polygon_mesh_processing/CMakeLists.txt
+++ b/Polygon_mesh_processing/test/Polygon_mesh_processing/CMakeLists.txt
@ -73,8 +73,9 @@ create_single_source_cgal_program("issue_8730.cpp")
 create_single_source_cgal_program("issue_7164.cpp")
 #  create_single_source_cgal_program("test_pmp_repair_self_intersections.cpp")

-find_package(Eigen3 3.2.0 QUIET) #(requires 3.2.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("fairing_test.cpp")
  target_link_libraries(fairing_test PUBLIC CGAL::Eigen3_support)
--- a/Polygonal_surface_reconstruction/examples/Polygonal_surface_reconstruction/CMakeLists.txt
+++ b/Polygonal_surface_reconstruction/examples/Polygonal_surface_reconstruction/CMakeLists.txt
@ -8,8 +8,9 @@ project(Polygonal_surface_reconstruction_Examples)
 # CGAL and its components
 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires Eigen 3.1 (or greater), and will not be compiled.")
  return()
--- a/Polygonal_surface_reconstruction/test/Polygonal_surface_reconstruction/CMakeLists.txt
+++ b/Polygonal_surface_reconstruction/test/Polygonal_surface_reconstruction/CMakeLists.txt
@ -8,8 +8,9 @@ project(Polygonal_surface_reconstruction_Tests)
 # CGAL and its components
 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires Eigen 3.1 (or greater), and will not be compiled.")
  return()
--- a/Principal_component_analysis/demo/Principal_component_analysis/CMakeLists.txt
+++ b/Principal_component_analysis/demo/Principal_component_analysis/CMakeLists.txt
@ -8,8 +8,9 @@ include_directories(./)
 # Find CGAL and CGAL Qt6
 find_package(CGAL REQUIRED OPTIONAL_COMPONENTS Qt6)

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires the Eigen library, and will not be compiled.")
  return()
--- a/Principal_component_analysis/examples/Principal_component_analysis/CMakeLists.txt
+++ b/Principal_component_analysis/examples/Principal_component_analysis/CMakeLists.txt
@ -7,8 +7,9 @@ project(Principal_component_analysis_Examples)
 find_package(CGAL REQUIRED)

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires Eigen 3.1 (or greater), and will not be compiled.")
  return()
--- a/Principal_component_analysis/test/Principal_component_analysis/CMakeLists.txt
+++ b/Principal_component_analysis/test/Principal_component_analysis/CMakeLists.txt
@ -7,8 +7,9 @@ project(Principal_component_analysis_Tests)
 find_package(CGAL REQUIRED)

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires Eigen 3.1 (or greater), and will not be compiled.")
  return()
--- a/Property_map/examples/Property_map/CMakeLists.txt
+++ b/Property_map/examples/Property_map/CMakeLists.txt
@ -6,8 +6,9 @@ find_package(CGAL REQUIRED)

 create_single_source_cgal_program("dynamic_properties.cpp")

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("custom_property_map.cpp")
  target_link_libraries(custom_property_map PUBLIC CGAL::Eigen3_support)
--- a/Ridges_3/examples/Ridges_3/CMakeLists.txt
+++ b/Ridges_3/examples/Ridges_3/CMakeLists.txt
@ -4,8 +4,9 @@ project(Ridges_3_Examples)

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)

  # Link with Boost.ProgramOptions (optional)
--- a/Ridges_3/test/Ridges_3/CMakeLists.txt
+++ b/Ridges_3/test/Ridges_3/CMakeLists.txt
@ -6,8 +6,9 @@ project(Ridges_3_Tests)

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("ridge_test.cpp")
  target_link_libraries(ridge_test PUBLIC CGAL::Eigen3_support)
--- a/SMDS_3/test/SMDS_3/CMakeLists.txt
+++ b/SMDS_3/test/SMDS_3/CMakeLists.txt
@ -9,8 +9,9 @@ find_package(CGAL REQUIRED)
 create_single_source_cgal_program( "test_simplicial_cb_vb.cpp")
 create_single_source_cgal_program( "test_tet_soup_to_c3t3.cpp")

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program( "test_c3t3.cpp" )
  create_single_source_cgal_program( "test_c3t3_io.cpp" )
--- a/Scale_space_reconstruction_3/examples/Scale_space_reconstruction_3/CMakeLists.txt
+++ b/Scale_space_reconstruction_3/examples/Scale_space_reconstruction_3/CMakeLists.txt
@ -14,8 +14,9 @@ if(ACTIVATE_CONCURRENCY)
  endif()
 endif()

-find_package(Eigen3 3.1.0 QUIET)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("scale_space.cpp")
  target_link_libraries(scale_space PUBLIC CGAL::Eigen3_support)
--- a/Shape_detection/benchmark/Shape_detection/CMakeLists.txt
+++ b/Shape_detection/benchmark/Shape_detection/CMakeLists.txt
@ -6,8 +6,9 @@ project(Shape_detection_Benchmarks)

 find_package(CGAL REQUIRED COMPONENTS Core)

-find_package(Eigen3 3.1.0 QUIET) # (3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("benchmark_region_growing_on_point_set_2.cpp")
  target_link_libraries(benchmark_region_growing_on_point_set_2 PUBLIC CGAL::Eigen3_support)
--- a/Shape_detection/examples/Shape_detection/CMakeLists.txt
+++ b/Shape_detection/examples/Shape_detection/CMakeLists.txt
@ -10,8 +10,9 @@ create_single_source_cgal_program("efficient_RANSAC_with_custom_shape.cpp")
 create_single_source_cgal_program("efficient_RANSAC_with_parameters.cpp")
 create_single_source_cgal_program("efficient_RANSAC_with_point_access.cpp")

-find_package(Eigen3 3.1.0 QUIET) # (3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  message(STATUS "Found Eigen 3")

--- a/Shape_detection/test/Shape_detection/CMakeLists.txt
+++ b/Shape_detection/test/Shape_detection/CMakeLists.txt
@ -18,10 +18,10 @@ create_single_source_cgal_program("test_efficient_RANSAC_torus_connected_compone
 create_single_source_cgal_program("test_efficient_RANSAC_torus_parameters.cpp")
 create_single_source_cgal_program("test_efficient_RANSAC_scene.cpp")

-find_package(Eigen3 3.1.0 QUIET) # (3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
-if(TARGET CGAL::Eigen3_support)

+if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("test_region_growing_basic.cpp")
  create_single_source_cgal_program("test_region_growing_strict.cpp")
  create_single_source_cgal_program("test_region_growing_on_cube.cpp")
--- a/Shape_regularization/examples/Shape_regularization/CMakeLists.txt
+++ b/Shape_regularization/examples/Shape_regularization/CMakeLists.txt
@ -27,8 +27,9 @@ if(TARGET CGAL::OSQP_support)
  endforeach()

  # Use Eigen.
-  find_package(Eigen3 3.1.0 QUIET) # (3.1.0 or greater)
+  find_package(Eigen3 QUIET)
  include(CGAL_Eigen3_support)
+
  if(TARGET CGAL::Eigen3_support)
    message(STATUS "Found Eigen")

--- a/Solver_interface/examples/Solver_interface/CMakeLists.txt
+++ b/Solver_interface/examples/Solver_interface/CMakeLists.txt
@ -7,8 +7,9 @@ project(Solver_interface_Examples)
 find_package(CGAL REQUIRED)

 # Use Eigen
-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("singular_value_decomposition.cpp")
  target_link_libraries(singular_value_decomposition PUBLIC CGAL::Eigen3_support)
--- a/Spatial_searching/benchmark/Spatial_searching/CMakeLists.txt
+++ b/Spatial_searching/benchmark/Spatial_searching/CMakeLists.txt
@ -8,8 +8,9 @@ find_package(CGAL REQUIRED COMPONENTS Core)

 include_directories(BEFORE "include")

-find_package(Eigen3 3.1.91 QUIET) # (requires 3.1.91 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: These benchmarks require Eigen 3.1.91 (or greater), and will not be compiled.")
  return()
--- a/Spatial_searching/examples/Spatial_searching/CMakeLists.txt
+++ b/Spatial_searching/examples/Spatial_searching/CMakeLists.txt
@ -26,8 +26,9 @@ create_single_source_cgal_program("weighted_Minkowski_distance.cpp")
 create_single_source_cgal_program("searching_sphere_orthogonally.cpp")
 create_single_source_cgal_program("splitter_worst_cases.cpp")

-find_package(Eigen3 3.1.91 QUIET) #(requires 3.1.91 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("fuzzy_range_query.cpp")
  target_link_libraries(fuzzy_range_query PUBLIC CGAL::Eigen3_support)
--- a/Stream_lines_2/include/CGAL/Regular_grid_2.h
+++ b/Stream_lines_2/include/CGAL/Regular_grid_2.h
@ -93,7 +93,7 @@ public:

 template <class StreamLinesTraits_2>
 inline
-typename Regular_grid_2<StreamLinesTraits_2>::Geom_traits::Iso_rectangle_2
+typename StreamLinesTraits_2::Iso_rectangle_2
 Regular_grid_2<StreamLinesTraits_2>::bbox() const
 {
  return typename Geom_traits::Iso_rectangle_2(0.0, 0.0,
--- a/Stream_lines_2/include/CGAL/Triangular_field_2.h
+++ b/Stream_lines_2/include/CGAL/Triangular_field_2.h
@ -134,7 +134,7 @@ protected:

 template <class StreamLinesTraits_2>
 inline
-typename Triangular_field_2<StreamLinesTraits_2>::Geom_traits::Iso_rectangle_2
+typename StreamLinesTraits_2::Iso_rectangle_2
 Triangular_field_2<StreamLinesTraits_2>::bbox() const
 {
  return typename Geom_traits::Iso_rectangle_2(minx, miny, maxx,
--- a/Stream_support/test/Stream_support/issue8155.cpp
+++ b/Stream_support/test/Stream_support/issue8155.cpp
@ -23,12 +23,13 @@ int main()
  std::vector<PointVectorPair> pv_pairs;
  const std::function<void(const PointVectorPair& p)> lambda =
    [&](const PointVectorPair& p) {
-    FT len = p.second.squared_length();
-    if (len > 0 || len != 1.0) {
-      Vector_3 n = p.second * (1.0 / CGAL::sqrt(len));
-      pv_pairs.push_back(std::make_pair(p.first, n));
-    }
-    else pv_pairs.push_back(p);
+      const FT len = CGAL::sqrt(p.second.squared_length());
+      if (len > 0) {
+        Vector_3 n = p.second / len;
+        pv_pairs.push_back(std::make_pair(p.first, n));
+      } else {
+        pv_pairs.push_back(p);
+      }
    };

  pv_pairs.clear();
--- a/Surface_mesh_approximation/examples/Surface_mesh_approximation/CMakeLists.txt
+++ b/Surface_mesh_approximation/examples/Surface_mesh_approximation/CMakeLists.txt
@ -8,8 +8,9 @@ project(Surface_mesh_approximation_Examples)
 find_package(CGAL REQUIRED)

 # Use Eigen (for PCA)
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires Eigen 3.1 (or greater), and will not be compiled.")
  return()
--- a/Surface_mesh_approximation/test/Surface_mesh_approximation/CMakeLists.txt
+++ b/Surface_mesh_approximation/test/Surface_mesh_approximation/CMakeLists.txt
@ -8,8 +8,9 @@ project(Surface_mesh_approximation_Tests)
 find_package(CGAL REQUIRED)

 # Use Eigen (for PCA)
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: This project requires Eigen 3.1 (or greater), and will not be compiled.")
  return()
--- a/Surface_mesh_deformation/benchmark/Surface_mesh_deformation/optimal_rotation/CMakeLists.txt
+++ b/Surface_mesh_deformation/benchmark/Surface_mesh_deformation/optimal_rotation/CMakeLists.txt
@ -3,8 +3,9 @@ project(benchmark_for_closest_rotation)

 find_package(CGAL REQUIRED COMPONENTS Core)

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("benchmark_for_concept_models.cpp")
  target_link_libraries(benchmark_for_concept_models PUBLIC CGAL::Eigen3_support)
--- a/Surface_mesh_deformation/demo/Surface_mesh_deformation/CMakeLists.txt
+++ b/Surface_mesh_deformation/demo/Surface_mesh_deformation/CMakeLists.txt
@ -8,8 +8,9 @@ set_property(DIRECTORY PROPERTY CGAL_NO_TESTING TRUE)

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.91 QUIET) #(requires 3.1.91 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("deform_mesh_for_botsch08_format.cpp")
  target_link_libraries(deform_mesh_for_botsch08_format PUBLIC CGAL::Eigen3_support)
--- a/Surface_mesh_deformation/examples/Surface_mesh_deformation/CMakeLists.txt
+++ b/Surface_mesh_deformation/examples/Surface_mesh_deformation/CMakeLists.txt
@ -6,8 +6,9 @@ project(Surface_mesh_deformation_Examples)

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.91 QUIET) #(requires 3.1.91 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("all_roi_assign_example.cpp")
  create_single_source_cgal_program("all_roi_assign_example_custom_polyhedron.cpp")
--- a/Surface_mesh_deformation/test/Surface_mesh_deformation/CMakeLists.txt
+++ b/Surface_mesh_deformation/test/Surface_mesh_deformation/CMakeLists.txt
@ -6,8 +6,9 @@ project(Surface_mesh_deformation_Tests)

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.91 QUIET) #(requires 3.1.91 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("Cactus_deformation_session.cpp")
  target_link_libraries(Cactus_deformation_session PUBLIC CGAL::Eigen3_support)
--- a/Surface_mesh_parameterization/examples/Surface_mesh_parameterization/CMakeLists.txt
+++ b/Surface_mesh_parameterization/examples/Surface_mesh_parameterization/CMakeLists.txt
@ -5,8 +5,9 @@ project(Surface_mesh_parameterization_Examples)

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  # Executables that require Eigen 3.1

--- a/Surface_mesh_parameterization/test/Surface_mesh_parameterization/CMakeLists.txt
+++ b/Surface_mesh_parameterization/test/Surface_mesh_parameterization/CMakeLists.txt
@ -14,8 +14,9 @@ else()
  message(STATUS "NOTICE: Examples will be compiled without the SuiteSparse library and UmfPack. Try setting CMAKE_PREFIX_PATH to your SuiteSparse installation.")
 endif()

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("extensive_parameterization_test.cpp")
  target_link_libraries(extensive_parameterization_test PUBLIC CGAL::Eigen3_support)
--- a/Surface_mesh_simplification/examples/Surface_mesh_simplification/CMakeLists.txt
+++ b/Surface_mesh_simplification/examples/Surface_mesh_simplification/CMakeLists.txt
@ -19,8 +19,9 @@ create_single_source_cgal_program("edge_collapse_all_short_edges.cpp")
 create_single_source_cgal_program("edge_collapse_bounded_normal_change.cpp")
 create_single_source_cgal_program("edge_collapse_visitor_surface_mesh.cpp")

-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("edge_collapse_garland_heckbert.cpp")
  target_link_libraries(edge_collapse_garland_heckbert PUBLIC CGAL::Eigen3_support)
--- a/Surface_mesh_simplification/test/Surface_mesh_simplification/CMakeLists.txt
+++ b/Surface_mesh_simplification/test/Surface_mesh_simplification/CMakeLists.txt
@ -14,8 +14,9 @@ create_single_source_cgal_program("test_edge_profile_link.cpp")
 create_single_source_cgal_program("test_edge_deprecated_stop_predicates.cpp")
 create_single_source_cgal_program("test_edge_collapse_stability.cpp")

-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("edge_collapse_garland_heckbert_variations.cpp")
  target_link_libraries(edge_collapse_garland_heckbert_variations PUBLIC CGAL::Eigen3_support)
--- a/Surface_mesh_skeletonization/benchmark/Surface_mesh_skeletonization/CMakeLists.txt
+++ b/Surface_mesh_skeletonization/benchmark/Surface_mesh_skeletonization/CMakeLists.txt
@ -7,8 +7,9 @@ project(Mean_curvature_skeleton)
 # CGAL and its components
 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.2.0 QUIET) #(requires 3.2.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("solver_benchmark.cpp")
  target_link_libraries(solver_benchmark PUBLIC CGAL::Eigen3_support)
--- a/Surface_mesh_skeletonization/examples/Surface_mesh_skeletonization/CMakeLists.txt
+++ b/Surface_mesh_skeletonization/examples/Surface_mesh_skeletonization/CMakeLists.txt
@ -6,8 +6,9 @@ project(Surface_mesh_skeletonization_Examples)

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.2.0 QUIET) #(requires 3.2.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("simple_mcfskel_example.cpp")
  create_single_source_cgal_program("simple_mcfskel_sm_example.cpp")
--- a/Surface_mesh_skeletonization/test/Surface_mesh_skeletonization/CMakeLists.txt
+++ b/Surface_mesh_skeletonization/test/Surface_mesh_skeletonization/CMakeLists.txt
@ -6,8 +6,9 @@ project(Surface_mesh_skeletonization_Tests)

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.2.0 QUIET) #(requires 3.2.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("MCF_Skeleton_test.cpp")
  target_link_libraries(MCF_Skeleton_test PUBLIC CGAL::Eigen3_support)
--- a/Tetrahedral_remeshing/examples/Tetrahedral_remeshing/CMakeLists.txt
+++ b/Tetrahedral_remeshing/examples/Tetrahedral_remeshing/CMakeLists.txt
@ -25,8 +25,9 @@ else()
 endif()

 # Use Eigen for Mesh_3
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program( "mesh_and_remesh_polyhedral_domain_with_features.cpp" )
  target_link_libraries(mesh_and_remesh_polyhedral_domain_with_features PUBLIC CGAL::Eigen3_support)
--- a/Tetrahedral_remeshing/test/Tetrahedral_remeshing/CMakeLists.txt
+++ b/Tetrahedral_remeshing/test/Tetrahedral_remeshing/CMakeLists.txt
@ -27,8 +27,9 @@ cgal_add_test(test_tetrahedral_remeshing_mls)


 # Tests using Mesh_3 require Eigen
-find_package(Eigen3 3.1.0 QUIET) #(3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("test_mesh_and_remesh_polyhedron_with_features.cpp")
  target_link_libraries(test_mesh_and_remesh_polyhedron_with_features PUBLIC CGAL::Eigen3_support)
--- a/Triangulation/applications/Triangulation/CMakeLists.txt
+++ b/Triangulation/applications/Triangulation/CMakeLists.txt
@ -7,8 +7,9 @@ project(Triangulation_apps)
 # CGAL and its components
 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(NOT TARGET CGAL::Eigen3_support)
  message("NOTICE: Applications require Eigen 3.1 (or greater), and will not be compiled")
  return()
--- a/Triangulation/benchmark/Triangulation/CMakeLists.txt
+++ b/Triangulation/benchmark/Triangulation/CMakeLists.txt
@ -6,8 +6,9 @@ project(Triangulation_benchmark)

 find_package(CGAL REQUIRED COMPONENTS Core)

-find_package(Eigen3 3.1.0 QUIET)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  include_directories(BEFORE "include")

--- a/Triangulation/examples/Triangulation/CMakeLists.txt
+++ b/Triangulation/examples/Triangulation/CMakeLists.txt
@ -11,8 +11,9 @@ endif()

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  create_single_source_cgal_program("barycentric_subdivision.cpp")
  create_single_source_cgal_program("delaunay_triangulation.cpp")
--- a/Triangulation/test/Triangulation/CMakeLists.txt
+++ b/Triangulation/test/Triangulation/CMakeLists.txt
@ -11,8 +11,9 @@ endif()

 find_package(CGAL REQUIRED)

-find_package(Eigen3 3.1.0 QUIET)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)
+
 if(TARGET CGAL::Eigen3_support)
  include_directories(BEFORE "include")

--- a/Triangulation_3/demo/Triangulation_3/CMakeLists.txt
+++ b/Triangulation_3/demo/Triangulation_3/CMakeLists.txt
@ -63,9 +63,6 @@ if(CGAL_Qt6_FOUND AND Qt6_FOUND)
  include(${CGAL_MODULES_DIR}/CGAL_add_test.cmake)
  cgal_add_compilation_test(T3_demo)

-  include(${CGAL_MODULES_DIR}/CGAL_add_test.cmake)
-  cgal_add_compilation_test(T3_demo)
-
 else(CGAL_Qt6_FOUND AND Qt6_FOUND)

  set(TRIANGULATION_3_MISSING_DEPS "")
--- a/Triangulation_3/demo/Triangulation_3/MainWindow.cpp
+++ b/Triangulation_3/demo/Triangulation_3/MainWindow.cpp
@ -209,31 +209,3 @@ void MainWindow::on_actionClear_Scene_triggered()
  // update viewer
  Q_EMIT( sceneChanged() );
 }
-
-void MainWindow::popupAboutCGAL()
-{
-  // read contents from .html file
-  QFile about_CGAL(":/documentation/documentation/about_CGAL.html");
-  about_CGAL.open(QIODevice::ReadOnly|QIODevice::Text);
-  QString about_CGAL_txt = QTextStream(&about_CGAL).readAll();
-
-  // popup a message box
-  QMessageBox mb(QMessageBox::NoIcon,
-                 tr("About CGAL..."),
-                 about_CGAL_txt,
-                 QMessageBox::Ok,
-                 this);
-
-  // set links to be accessible by mouse or keyboard
-  QLabel* mb_label = mb.findChild<QLabel*>("qt_msgbox_label");
-  if(mb_label) {
-    mb_label->setTextInteractionFlags(mb_label->textInteractionFlags() |
-                                      ::Qt::LinksAccessibleByMouse |
-                                      ::Qt::LinksAccessibleByKeyboard);
-  } else {
-    std::cerr << "Cannot find child \"qt_msgbox_label\" in QMessageBox\n"
-              << "  with Qt version " << QT_VERSION_STR << "!\n";
-  }
-
-  mb.exec();
-}
--- a/Triangulation_3/demo/Triangulation_3/MainWindow.h
+++ b/Triangulation_3/demo/Triangulation_3/MainWindow.h
@ -36,9 +36,6 @@ public Q_SLOTS:
  // show menu
  void on_actionClear_Scene_triggered();

-  // about menu
-  void popupAboutCGAL();
-
  Q_SIGNALS:
  void sceneChanged();

--- a/Triangulation_3/demo/Triangulation_3/T3_demo.cpp
+++ b/Triangulation_3/demo/Triangulation_3/T3_demo.cpp
@ -25,6 +25,9 @@ int main(int argc, char** argv)
  app.setOrganizationName("INRIA");
  app.setApplicationName("3D Triangulation Demo");

+  // Import resources from libCGALQt (Qt6).
+  CGAL_QT_INIT_RESOURCES;
+
  MainWindow mw;
  mw.show();

--- a/Triangulation_3/demo/Triangulation_3/Viewer.cpp
+++ b/Triangulation_3/demo/Triangulation_3/Viewer.cpp
@ -183,13 +183,13 @@ void Viewer::compile_shaders()
        "} \n"
        "\n"
    };
-    QOpenGLShader *vertex_shader = new QOpenGLShader(QOpenGLShader::Vertex);
+    QOpenGLShader *vertex_shader = new QOpenGLShader(QOpenGLShader::Vertex, this);
    if(!vertex_shader->compileSourceCode(vertex_source))
    {
        std::cerr<<"Compiling vertex source FAILED"<<std::endl;
    }

-    QOpenGLShader *fragment_shader= new QOpenGLShader(QOpenGLShader::Fragment);
+    QOpenGLShader *fragment_shader= new QOpenGLShader(QOpenGLShader::Fragment, this);
    if(!fragment_shader->compileSourceCode(fragment_source))
    {
        std::cerr<<"Compiling fragmentsource FAILED"<<std::endl;
@ -258,14 +258,14 @@ void Viewer::compile_shaders()
        "} \n"
        "\n"
    };
-    QOpenGLShader *vertex_shader_spheres = new QOpenGLShader(QOpenGLShader::Vertex);
+    QOpenGLShader *vertex_shader_spheres = new QOpenGLShader(QOpenGLShader::Vertex, this);
    if(!vertex_shader_spheres->compileSourceCode(vertex_source_spheres))
    {
        std::cerr<<"Compiling vertex source FAILED"<<std::endl;
    }


-    QOpenGLShader *fragment_shader_spheres= new QOpenGLShader(QOpenGLShader::Fragment);
+    QOpenGLShader *fragment_shader_spheres= new QOpenGLShader(QOpenGLShader::Fragment, this);
    if(!fragment_shader_spheres->compileSourceCode(fragment_source_spheres))
    {
        std::cerr<<"Compiling fragmentsource FAILED"<<std::endl;
@ -312,7 +312,7 @@ void Viewer::compile_shaders()



-    QOpenGLShader *vertex_shader_cylinders = new QOpenGLShader(QOpenGLShader::Vertex);
+    QOpenGLShader *vertex_shader_cylinders = new QOpenGLShader(QOpenGLShader::Vertex, this);
    if(!vertex_shader_cylinders->compileSourceCode(vertex_source_cylinders))
    {
        std::cerr<<"Compiling vertex source FAILED"<<std::endl;
@ -1628,7 +1628,7 @@ void Viewer::draw()

 }

-void Viewer::drawVertex(const Point_3& p, std::vector<float> *vertices)
+void Viewer::drawVertex(const Point_3& p, Coords_ptr& vertices)
 {

    vertices->push_back(p.x()); vertices->push_back(p.y()); vertices->push_back(p.z());
@ -1636,13 +1636,13 @@ void Viewer::drawVertex(const Point_3& p, std::vector<float> *vertices)

 }

-void Viewer::drawEdge(const Point_3& from, const Point_3& to, std::vector<float> *vertices)
+void Viewer::drawEdge(const Point_3& from, const Point_3& to, Coords_ptr& vertices)
 {
    vertices->push_back( from.x()); vertices->push_back(from.y()); vertices->push_back(from.z());
    vertices->push_back( to.x()); vertices->push_back(to.y()); vertices->push_back(to.z());
 }

-void Viewer::drawFacet(const Triangle_3& t, std::vector<float> *vertices)
+void Viewer::drawFacet(const Triangle_3& t, Coords_ptr& vertices)
 {
    Point_3 p0 = t.vertex(0);
    Point_3 p1 = t.vertex(1);
@ -2482,7 +2482,7 @@ void Viewer::incremental_insert() {
 }


-void Viewer::draw_cylinder(float R, int prec, std::vector<float> *vertices, std::vector<float> *normals)
+void Viewer::draw_cylinder(float R, int prec, Coords_ptr& vertices, Coords_ptr& normals)
 {
    vertices->resize(0);
    normals->resize(0);
@ -2551,7 +2551,7 @@ void Viewer::draw_cylinder(float R, int prec, std::vector<float> *vertices, std:
    }
 }

-void Viewer::draw_sphere(float R, int prec, std::vector<float> *vertices, std::vector<float> *normals)
+void Viewer::draw_sphere(float R, int prec, Coords_ptr& vertices, Coords_ptr& normals)
 {
    vertices->resize(0);
    normals->resize(0);
--- a/Triangulation_3/demo/Triangulation_3/Viewer.h
+++ b/Triangulation_3/demo/Triangulation_3/Viewer.h
@ -42,42 +42,41 @@ public:
    , m_hasEmptyS(false)
    , m_showTrackball(true)
    , m_pDlgPrefer(nullptr)
-    {
-      pos_emptyFacet = new std::vector<float>();
-      pos_emptySphere= new std::vector<float>();
-      points_emptySphere = new std::vector<float>();
-      pos_points = new std::vector<float>();
-      pos_newPoint = new std::vector<float>();
-      pos_selectedVertex = new std::vector<float>();
-      pos_movingPoint = new std::vector<float>();
-      pos_queryPoint = new std::vector<float>();
-      pos_trackBall  = new std::vector<float>();
-      pos_voronoi = new std::vector<float>();
-      pos_delaunay = new std::vector<float>();
-      pos_facets = new std::vector<float>();
-      pos_newFacet = new std::vector<float>();
-      pos_nearest_neighbor = new std::vector<float>();
-      points_locationSphere = new std::vector<float>();
-      points_cylinder = new std::vector<float>();
-      normals_cylinder = new std::vector<float>();
-      points_sphere = new std::vector<float>();
-      points_trackBall = new std::vector<float>();
-      normals_sphere = new std::vector<float>();
-      normals_emptySphere = new std::vector<float>();
-      normals_trackBall= new std::vector<float>();
-      transfo1_voronoi = new std::vector<float>();
-      transfo2_voronoi = new std::vector<float>();
-      transfo3_voronoi = new std::vector<float>();
-      transfo4_voronoi = new std::vector<float>();
-      transfo1_delaunay = new std::vector<float>();
-      transfo2_delaunay = new std::vector<float>();
-      transfo3_delaunay = new std::vector<float>();
-      transfo4_delaunay = new std::vector<float>();
-      incremental_points = new std::vector<float>();
-      incremental_next_point = new std::vector<float>();
-      incremental_facet = new std::vector<float>();
-      incremental_conflict = new std::vector<float>();
-    }
+    , pos_emptyFacet{new Coords}
+    , pos_emptySphere{new Coords}
+    , points_emptySphere{new Coords}
+    , pos_points{new Coords}
+    , pos_newPoint{new Coords}
+    , pos_selectedVertex{new Coords}
+    , pos_movingPoint{new Coords}
+    , pos_queryPoint{new Coords}
+    , pos_trackBall{ new Coords}
+    , pos_voronoi{new Coords}
+    , pos_delaunay{new Coords}
+    , pos_facets{new Coords}
+    , pos_newFacet{new Coords}
+    , pos_nearest_neighbor{new Coords}
+    , points_locationSphere{new Coords}
+    , points_cylinder{new Coords}
+    , normals_cylinder{new Coords}
+    , points_sphere{new Coords}
+    , points_trackBall{new Coords}
+    , normals_sphere{new Coords}
+    , normals_emptySphere{new Coords}
+    , normals_trackBall{new Coords}
+    , transfo1_voronoi{new Coords}
+    , transfo2_voronoi{new Coords}
+    , transfo3_voronoi{new Coords}
+    , transfo4_voronoi{new Coords}
+    , transfo1_delaunay{new Coords}
+    , transfo2_delaunay{new Coords}
+    , transfo3_delaunay{new Coords}
+    , transfo4_delaunay{new Coords}
+    , incremental_points{new Coords}
+    , incremental_next_point{new Coords}
+    , incremental_facet{new Coords}
+    , incremental_conflict{new Coords}
+  {}

  ~Viewer()
  {
@ -269,12 +268,15 @@ protected:
  QString helpString() const;

 private:
+  using Coords = std::vector<float>;
+  using Coords_ptr = std::unique_ptr<std::vector<float>>;
+
  // draw a 3d effect vertex
-  void drawVertex(const Point_3& p, std::vector<float> *vertices);
+  void drawVertex(const Point_3& p, Coords_ptr&  vertices);
  // draw a 3d effect edge
-  void drawEdge(const Point_3& from, const Point_3 &to, std::vector<float> *vertices);
+  void drawEdge(const Point_3& from, const Point_3 &to, Coords_ptr&  vertices);
  // draw a facet
-  void drawFacet(const Triangle_3& t, std::vector<float> *vertices);
+  void drawFacet(const Triangle_3& t, Coords_ptr&  vertices);
  // test whether the give 3D point is on the sphere
  inline bool isOnSphere( const Point_3 & pt ) {
    return ( (pt.x()*pt.x() + pt.y()*pt.y() + pt.z()*pt.z()) == (m_fRadius*m_fRadius) );
@ -347,75 +349,74 @@ private:
  static const int vaoSize = 29;
  static const int vboSize = 34;
  // define material
-   QVector4D        ambient;
-   QVector4D        diffuse;
-   QVector4D        specular;
-   GLfloat      shininess ;
-      int poly_vertexLocation[3];
-      int normalsLocation[3];
-      int mvpLocation[3];
-      int mvLocation[2];
-      int centerLocation[5];
-      int colorLocation[3];
-      int lightLocation[5*2];
+  QVector4D        ambient;
+  QVector4D        diffuse;
+  QVector4D        specular;
+  GLfloat      shininess ;
+  int poly_vertexLocation[3];
+  int normalsLocation[3];
+  int mvpLocation[3];
+  int mvLocation[2];
+  int centerLocation[5];
+  int colorLocation[3];
+  int lightLocation[5*2];

-      bool are_buffers_initialized;
-      bool extension_is_found;
+  bool are_buffers_initialized;
+  bool extension_is_found;

-      std::vector<float> *pos_emptyFacet;
-      std::vector<float> *pos_emptySphere;
-      std::vector<float> *points_emptySphere;
-      std::vector<float> *pos_points;
-      std::vector<float> *pos_newPoint;
-      std::vector<float> *pos_selectedVertex;
-      std::vector<float> *pos_movingPoint;
-      std::vector<float> *pos_queryPoint;
-      std::vector<float> *pos_trackBall;
-      std::vector<float> *points_trackBall;
-      std::vector<float> *pos_voronoi;
-      std::vector<float> *pos_delaunay;
-      std::vector<float> *pos_facets;
-      std::vector<float> *pos_newFacet;
-      std::vector<float> *pos_nearest_neighbor;
-      std::vector<float> *points_locationSphere;
-      std::vector<float> *points_cylinder;
-      std::vector<float> *normals_cylinder;
-      std::vector<float> *points_sphere;
-      std::vector<float> *normals_sphere;
-      std::vector<float> *normals_emptySphere;
-      std::vector<float> *normals_trackBall;
-      std::vector<float> *transfo1_voronoi;
-      std::vector<float> *transfo2_voronoi;
-      std::vector<float> *transfo3_voronoi;
-      std::vector<float> *transfo4_voronoi;
-      std::vector<float> *transfo1_delaunay;
-      std::vector<float> *transfo2_delaunay;
-      std::vector<float> *transfo3_delaunay;
-      std::vector<float> *transfo4_delaunay;
-      std::vector<float> *incremental_points;
-      std::vector<float> *incremental_next_point;
-      std::vector<float> *incremental_facet;
-      std::vector<float> *incremental_conflict;
+  Coords_ptr pos_emptyFacet;
+  Coords_ptr pos_emptySphere;
+  Coords_ptr points_emptySphere;
+  Coords_ptr pos_points;
+  Coords_ptr pos_newPoint;
+  Coords_ptr pos_selectedVertex;
+  Coords_ptr pos_movingPoint;
+  Coords_ptr pos_queryPoint;
+  Coords_ptr pos_trackBall;
+  Coords_ptr pos_voronoi;
+  Coords_ptr pos_delaunay;
+  Coords_ptr pos_facets;
+  Coords_ptr pos_newFacet;
+  Coords_ptr pos_nearest_neighbor;
+  Coords_ptr points_locationSphere;
+  Coords_ptr points_cylinder;
+  Coords_ptr normals_cylinder;
+  Coords_ptr points_sphere;
+  Coords_ptr points_trackBall;
+  Coords_ptr normals_sphere;
+  Coords_ptr normals_emptySphere;
+  Coords_ptr normals_trackBall;
+  Coords_ptr transfo1_voronoi;
+  Coords_ptr transfo2_voronoi;
+  Coords_ptr transfo3_voronoi;
+  Coords_ptr transfo4_voronoi;
+  Coords_ptr transfo1_delaunay;
+  Coords_ptr transfo2_delaunay;
+  Coords_ptr transfo3_delaunay;
+  Coords_ptr transfo4_delaunay;
+  Coords_ptr incremental_points;
+  Coords_ptr incremental_next_point;
+  Coords_ptr incremental_facet;
+  Coords_ptr incremental_conflict;
+  //pickin
+  QMap<float, int> picked_IDs;
+  QPoint picking_pos;

-      //picking
-      QMap<float, int> picked_IDs;
-      QPoint picking_pos;
-
-      QOpenGLBuffer buffers[vboSize];
-      QOpenGLVertexArrayObject vao[vaoSize];
-      QOpenGLShaderProgram rendering_program;
-      QOpenGLShaderProgram rendering_program_spheres;
-      QOpenGLShaderProgram rendering_program_cylinders;
-      typedef void (APIENTRYP PFNGLDRAWARRAYSINSTANCEDARBPROC) (GLenum mode, GLint first, GLsizei count, GLsizei primcount);
-      typedef void (APIENTRYP PFNGLVERTEXATTRIBDIVISORARBPROC) (GLuint index, GLuint divisor);
-      PFNGLDRAWARRAYSINSTANCEDARBPROC glDrawArraysInstanced;
-      PFNGLVERTEXATTRIBDIVISORARBPROC glVertexAttribDivisor;
-      void initialize_buffers();
-      void compute_elements();
-      void attrib_buffers(CGAL::QGLViewer*);
-      void compile_shaders();
-      void draw_cylinder(float R, int prec, std::vector<float> *vertices, std::vector<float> *normals);
-      void draw_sphere(float R, int prec, std::vector<float> *vertices, std::vector<float> *normals);
+  QOpenGLBuffer buffers[vboSize];
+  QOpenGLVertexArrayObject vao[vaoSize];
+  QOpenGLShaderProgram rendering_program;
+  QOpenGLShaderProgram rendering_program_spheres;
+  QOpenGLShaderProgram rendering_program_cylinders;
+  typedef void (APIENTRYP PFNGLDRAWARRAYSINSTANCEDARBPROC) (GLenum mode, GLint first, GLsizei count, GLsizei primcount);
+  typedef void (APIENTRYP PFNGLVERTEXATTRIBDIVISORARBPROC) (GLuint index, GLuint divisor);
+  PFNGLDRAWARRAYSINSTANCEDARBPROC glDrawArraysInstanced;
+  PFNGLVERTEXATTRIBDIVISORARBPROC glVertexAttribDivisor;
+  void initialize_buffers();
+  void compute_elements();
+  void attrib_buffers(CGAL::QGLViewer*);
+  void compile_shaders();
+  void draw_cylinder(float R, int prec, Coords_ptr&  vertices, Coords_ptr&  normals);
+  void draw_sphere(float R, int prec, Coords_ptr&  vertices, Coords_ptr&  normals);
 };

 #endif
--- a/Triangulation_on_sphere_2/demo/Triangulation_on_sphere_2/CMakeLists.txt
+++ b/Triangulation_on_sphere_2/demo/Triangulation_on_sphere_2/CMakeLists.txt
@ -18,7 +18,7 @@ find_package(CGAL REQUIRED OPTIONAL_COMPONENTS Qt6)
 # Find Qt6 itself
 find_package(Qt6 QUIET COMPONENTS Widgets OpenGL)

-find_package(Eigen3 3.1.0 QUIET) #(requires 3.1.0 or greater)
+find_package(Eigen3 QUIET)
 include(CGAL_Eigen3_support)

 if(CGAL_Qt6_FOUND AND Qt6_FOUND AND TARGET CGAL::Eigen3_support)
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Andreas Fabri	543d424f58	Periodic_triangulation_3: Fix warning in demo	2025-12-03 11:36:14 +01:00
Sebastien Loriot	0fc710e95d	Fix bad 'if' condition & warning (#9126 ) ## Summary of Changes ``` Building CXX object test/Stream_support/CMakeFiles/issue8155.dir/issue8155.cpp.o cd /home/cgal_tester/build/src/cmake/platforms/ArchLinux-clang-CXX20-Release/test/Stream_support && /bin/clang++ -DCGAL_DATA_DIR=\"/mnt/testsuite/data\" -DCGAL_TEST_SUITE=1 -DCGAL_USE_GMPXX=1 -I/home/cgal_tester/build/src/cmake/platforms/ArchLinux-clang-CXX20-Release/include -I/mnt/testsuite/include -isystem /usr/local/boost/include -Wall -O3 -std=c++20 -DCGAL_NDEBUG -MD -MT test/Stream_support/CMakeFiles/issue8155.dir/issue8155.cpp.o -MF CMakeFiles/issue8155.dir/issue8155.cpp.o.d -o CMakeFiles/issue8155.dir/issue8155.cpp.o -c /mnt/testsuite/test/Stream_support/issue8155.cpp /mnt/testsuite/test/Stream_support/issue8155.cpp:27:17: warning: overlapping comparisons always evaluate to true [-Wtautological-overlap-compare] 27 \| if (len > 0 \|\| len != 1.0) { \| ~~~~~~~~^~~~~~~~~~~~~ 1 warning generated. ``` https://cgal.geometryfactory.com/CGAL/testsuite/CGAL-6.2-Ic-36/Stream_support/TestReport_cgaltest_ArchLinux-clang-CXX20-Release.gz ## Release Management * Affected package(s): `Stream_support` * Issue(s) solved (if any): n/a * Feature/Small Feature (if any): n/a * License and copyright ownership: no change	2025-11-19 14:43:26 +01:00
Sebastien Loriot	dee5ed8cc2	Fix edge collapse with incident non-triangular faces (#9117 ) Make collapse able to handle non-triangular faces. The fix is easy as you simply don't need to join faces in case the face won't disappear after collapse TODO: update doc and constrained version	2025-11-19 14:42:28 +01:00
Sebastien Loriot	737bcb264e	Doc: fixing thirdparty links (#9134 ) ## Summary of Changes fixed Metis/Eigen3/Qt6 links in Thirdparty removed LEDA from doc as it is outdated ## Release Management * Affected package(s): Documentation	2025-11-19 14:41:58 +01:00
Sebastien Loriot	2f9854b422	Fix warning about discarding return type of function with [[nodiscard]] (#9127 ) ## Summary of Changes ``` Building CXX object test/Generator_Demo/CMakeFiles/Generator_2.dir/Generator_2.cpp.o cd /home/cgal_tester/build/src/cmake/platforms/ArchLinux-clang/test/Generator_Demo && /bin/clang++ -DCGAL_TEST_SUITE=1 -DCGAL_USE_GMPXX=1 -DQT_CORE_LIB -DQT_GUI_LIB -DQT_NO_KEYWORDS -DQT_OPENGLWIDGETS_LIB -DQT_OPENGL_LIB -DQT_WIDGETS_LIB -I/home/cgal_tester/build/src/cmake/platforms/ArchLinux-clang/test/Generator_Demo -I/mnt/testsuite/test/Generator_Demo -I/home/cgal_tester/build/src/cmake/platforms/ArchLinux-clang/include -I/mnt/testsuite/include -I/home/cgal_tester/build/src/cmake/platforms/ArchLinux-clang/test/AABB_tree_Demo -isystem /home/cgal_tester/build/src/cmake/platforms/ArchLinux-clang/test/Generator_Demo/Generator_2_autogen/include -isystem /usr/include/qt6/QtCore -isystem /usr/include/qt6 -isystem /usr/lib/qt6/mkspecs/linux-g++ -isystem /usr/include/qt6/QtOpenGLWidgets -isystem /usr/include/qt6/QtOpenGL -isystem /usr/include/qt6/QtGui -isystem /usr/include/qt6/QtWidgets -Wall -fno-direct-access-external-data -MD -MT test/Generator_Demo/CMakeFiles/Generator_2.dir/Generator_2.cpp.o -MF CMakeFiles/Generator_2.dir/Generator_2.cpp.o.d -o CMakeFiles/Generator_2.dir/Generator_2.cpp.o -c /mnt/testsuite/test/Generator_Demo/Generator_2.cpp In file included from /mnt/testsuite/test/Generator_Demo/Generator_2.cpp:27: In file included from /mnt/testsuite/include/CGAL/Qt/DemosMainWindow.h:130: /mnt/testsuite/include/CGAL/Qt/DemosMainWindow_impl.h:224:3: warning: ignoring return value of function declared with 'nodiscard' attribute [-Wunused-result] 224 \| about_CGAL.open(QIODevice::ReadOnly); \| ^~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~ 1 warning generated. ``` https://cgal.geometryfactory.com/CGAL/testsuite/CGAL-6.2-Ic-36/Generator_Demo/TestReport_gimeno_ArchLinux-clang.gz ## Release Management * Affected package(s): `GraphicsView` * Issue(s) solved (if any): n/a * Feature/Small Feature (if any): n/a * License and copyright ownership: no change	2025-11-19 14:41:07 +01:00
Sven Oesau	e12a760f03	fixed Metis/Eigen3/Qt6 links in Thirdparty removed LEDA from doc as it is outdated	2025-11-13 16:32:40 +01:00
Laurent Rineau	12445cc6e1	revert unintended modification	2025-11-13 11:52:21 +01:00
Sebastien Loriot	07347da411	Fix Ceres deprecation warning (#9121 ) ## Summary of Changes Changing the used cmake target for Ceres to Ceres::ceres. ## Release Management * Affected package(s): Installation, Polygon_mesh_processing	2025-11-13 10:02:36 +01:00
Laurent Rineau	d226e504c4	fix a warning use the correct implementation `popupAboutCGAL` from the base class	2025-11-12 16:48:59 +01:00
Laurent Rineau	097fc2c5ab	fix memory leaks	2025-11-12 16:48:29 +01:00
Sébastien Loriot	066159f792	assertion should be before the removal...	2025-11-10 10:17:33 +01:00
Mael Rouxel-Labbé	31734df2ef	Fix warning about discarding return type of function with [[nodiscard]]	2025-11-07 17:16:31 +01:00
Mael Rouxel-Labbé	3ef43324bb	Fix bad 'if' condition & warning	2025-11-07 17:05:21 +01:00
Sébastien Loriot	3c7d507530	update doc + apply changes to the constrained version	2025-11-06 19:40:48 +01:00
Sebastien Loriot	faae741666	Eigen3 5.0.0 support (#9112 ) ## Summary of Changes Adding support for Eigen3 5.0.0 by updating CMakeLists.txt scripts. ## Release Management * Issue(s) solved (if any): fix #9110	2025-11-06 10:03:20 +01:00
Sven Oesau	9e36c6744b	adding support for Eigen3 5.0.0 moving the Eigen3 version check into CGAL_Eigen3_support.cmake	2025-11-06 10:01:01 +01:00
Sven Oesau	05bf3c4ffc	Changing cmake target for Ceres	2025-11-04 17:04:58 +01:00
Sébastien Loriot	25005a97d8	clean up	2025-11-03 09:24:31 +01:00
Sébastien Loriot	3fe83c7ce0	handle non-triangular faces	2025-10-31 11:36:44 +01:00
Sebastien Loriot	c60cc5049d	Workaround erros with recent gcc (#9105 ) Should fix [those errors](https://cgal.geometryfactory.com/CGAL/testsuite/CGAL-6.2-Ic-23/Stream_lines_2/TestReport_lrineau_Ubuntu-latest-GCC6-CXX1z.gz)	2025-10-30 20:17:22 +01:00
Sébastien Loriot	712464b690	try to please recent gcc	2025-10-21 08:26:34 +02:00
Sebastien Loriot	b08f0a4aae	Handle case of identical projected points (#9100 ) Do not try to insert constraint if two points are projected onto the same 2D vertex	2025-10-17 10:06:08 +02:00
Sébastien Loriot	42068f6009	handle case of identical projected points	2025-10-15 11:03:16 +02:00
Sebastien Loriot	754e57ac3c	[OTR2] Deterministic reconstruction (#9092 ) ## Summary of Changes Using timestamps to make iteration through vertices, edges and faces deterministic ## Release Management * Affected package(s): Optimal_transportation_reconstruction_2 * Issue(s) solved (if any): fix #8745	2025-10-13 09:33:46 +02:00
Sven Oesau	2f6e3defa7	using timestamps to make iteration through vertices, edges and faces deterministic	2025-10-01 13:42:30 +02:00