diff --git a/Polyhedron/demo/Polyhedron/Plugins/PMP/CMakeLists.txt b/Polyhedron/demo/Polyhedron/Plugins/PMP/CMakeLists.txt
index adcd4f7f02b..9503348b9b7 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/PMP/CMakeLists.txt
+++ b/Polyhedron/demo/Polyhedron/Plugins/PMP/CMakeLists.txt
@@ -100,7 +100,7 @@ add_custom_target(self_intersection_plugin)
 add_dependencies(self_intersection_plugin selection_plugin)
 
 polyhedron_demo_plugin(triangulate_facets_plugin Triangulate_facets_plugin KEYWORDS PMP)
-target_link_libraries(triangulate_facets_plugin PUBLIC scene_surface_mesh_item scene_selection_item)
+target_link_libraries(triangulate_facets_plugin PUBLIC scene_surface_mesh_item scene_selection_item scene_polygon_soup_item)
 
 polyhedron_demo_plugin(corefinement_plugin Corefinement_plugin KEYWORDS PMP)
 target_link_libraries(corefinement_plugin PUBLIC scene_surface_mesh_item)
diff --git a/Polyhedron/demo/Polyhedron/Plugins/PMP/Triangulate_facets_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/PMP/Triangulate_facets_plugin.cpp
index c342e536ff2..6b85c6fb45b 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/PMP/Triangulate_facets_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/PMP/Triangulate_facets_plugin.cpp
@@ -4,10 +4,13 @@
 #include "Messages_interface.h"
 #include <CGAL/Three/Polyhedron_demo_plugin_helper.h>
 #include <CGAL/Three/Three.h>
+
 #include "Scene_surface_mesh_item.h"
 #include "Scene_polyhedron_selection_item.h"
+#include "Scene_polygon_soup_item.h"
 
 #include <CGAL/Polygon_mesh_processing/triangulate_faces.h>
+
 using namespace CGAL::Three;
 class Polyhedron_demo_triangulate_facets_plugin :
   public QObject,
@@ -20,13 +23,13 @@ class Polyhedron_demo_triangulate_facets_plugin :
   typedef Scene_surface_mesh_item::Face_graph FaceGraph;
   typedef boost::graph_traits<FaceGraph>::face_descriptor face_descriptor;
 
-  struct Visitor
+  struct Selection_updater_visitor
     : public CGAL::Polygon_mesh_processing::Hole_filling::Default_visitor
   {
     typedef typename Scene_polyhedron_selection_item::Selection_set_facet Container;
     Container& faces;
 
-    Visitor(Container& container)
+    Selection_updater_visitor(Container& container)
       : faces(container)
     {}
     void before_subface_creations(face_descriptor fd)
@@ -67,6 +70,8 @@ public:
         return true;
       if ( qobject_cast<Scene_polyhedron_selection_item*>(scene->item(index)))
         return true;
+      if(qobject_cast<Scene_polygon_soup_item*>(scene->item(index)))
+        return true;
     }
     return false;
   }
@@ -83,39 +88,54 @@ public Q_SLOTS:
       Scene_polyhedron_selection_item* selection_item =
         qobject_cast<Scene_polyhedron_selection_item*>(scene->item(index));
 
-      SMesh* pMesh = (sm_item != nullptr)
-                    ? sm_item->polyhedron()
-                    : selection_item->polyhedron();
+      Scene_polygon_soup_item* soup_item =
+        qobject_cast<Scene_polygon_soup_item*>(scene->item(index));
 
-      if(!pMesh) continue;
-      if(is_triangle_mesh(*pMesh)) {
-        CGAL::Three::Three::warning(tr("The polyhedron  \"%1\"  is already triangulated.")
-                          .arg(sm_item->name()) );
-        continue;
-      }
-      if (sm_item)
+      if (soup_item)
       {
-        if (!CGAL::Polygon_mesh_processing::triangulate_faces(*pMesh))
-          CGAL::Three::Three::warning(tr("Some facets could not be triangulated."));
+        soup_item->triangulate();
       }
-      else if (selection_item)
+      else
       {
-        Visitor visitor(selection_item->selected_facets);
-        if (!CGAL::Polygon_mesh_processing::triangulate_faces(
-                 selection_item->selected_facets,
-                 *pMesh,
-                 CGAL::parameters::visitor(visitor)))
-          CGAL::Three::Three::warning(tr("Some facets could not be triangulated."));
+        SMesh* pMesh = (sm_item != nullptr) ? sm_item->polyhedron()
+                                            : selection_item->polyhedron();
 
-        sm_item = selection_item->polyhedron_item();
-        selection_item->set_num_faces(num_faces(*sm_item->face_graph()));
+        if(!pMesh)
+          continue;
 
-        selection_item->invalidateOpenGLBuffers();
-        selection_item->itemChanged();
+        if(is_triangle_mesh(*pMesh))
+        {
+          CGAL::Three::Three::warning(tr("The polyhedron  \"%1\"  is already triangulated.")
+                            .arg(sm_item->name()) );
+          continue;
+        }
+
+        if (sm_item)
+        {
+          if (!CGAL::Polygon_mesh_processing::triangulate_faces(*pMesh))
+            CGAL::Three::Three::warning(tr("Some facets could not be triangulated."));
+
+          sm_item->invalidateOpenGLBuffers();
+        }
+        else if (selection_item)
+        {
+          Selection_updater_visitor visitor(selection_item->selected_facets);
+          if (!CGAL::Polygon_mesh_processing::triangulate_faces(
+                  selection_item->selected_facets,
+                  *pMesh,
+                  CGAL::parameters::visitor(visitor)))
+            CGAL::Three::Three::warning(tr("Some facets could not be triangulated."));
+
+          sm_item = selection_item->polyhedron_item();
+          selection_item->set_num_faces(num_faces(*sm_item->face_graph()));
+
+          selection_item->invalidateOpenGLBuffers();
+          selection_item->itemChanged();
+        }
+
+        sm_item->resetColors(); // @todo should have a visitor to give the color of the parent face
       }
 
-      sm_item->resetColors();
-      sm_item->invalidateOpenGLBuffers();
       scene->itemChanged(sm_item);
     } // end of the loop on the selected items
 
diff --git a/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.cpp b/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.cpp
index b258e0c5714..8ba8813f349 100644
--- a/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.cpp
@@ -22,6 +22,7 @@
 #include <CGAL/Polygon_mesh_processing/orientation.h>
 #include <CGAL/Polygon_mesh_processing/repair.h>
 #include <CGAL/Polygon_mesh_processing/repair_polygon_soup.h>
+#include <CGAL/Polygon_mesh_processing/triangulate_faces.h>
 #include <CGAL/Polygon_2.h>
 #include <CGAL/version.h>
 
@@ -419,6 +420,32 @@ void Scene_polygon_soup_item::inside_out()
   invalidateOpenGLBuffers();
 }
 
+void Scene_polygon_soup_item::repair(bool erase_dup, bool req_same_orientation)
+{
+  QApplication::setOverrideCursor(Qt::BusyCursor);
+  CGAL::Polygon_mesh_processing::repair_polygon_soup(
+        d->soup->points,
+        d->soup->polygons,
+        CGAL::parameters::erase_all_duplicates(erase_dup)
+                         .require_same_orientation(req_same_orientation));
+  QApplication::restoreOverrideCursor();
+  invalidateOpenGLBuffers();
+}
+
+bool Scene_polygon_soup_item::triangulate()
+{
+  QApplication::setOverrideCursor(Qt::BusyCursor);
+
+  bool success = true;
+
+  CGAL::Polygon_mesh_processing::triangulate_polygons(d->soup->points, d->soup->polygons);
+
+  QApplication::restoreOverrideCursor();
+  invalidateOpenGLBuffers();
+
+  return success;
+}
+
 bool
 Scene_polygon_soup_item::orient(std::vector<std::size_t>& non_manifold_vertices)
 {
@@ -894,20 +921,6 @@ void Scene_polygon_soup_item::computeElements() const
   QApplication::restoreOverrideCursor();
 }
 
-void Scene_polygon_soup_item::repair(bool erase_dup, bool req_same_orientation)
-{
-  QApplication::setOverrideCursor(Qt::BusyCursor);
-  CGAL::Polygon_mesh_processing::repair_polygon_soup(
-        d->soup->points,
-        d->soup->polygons,
-        CGAL::parameters::
-        erase_all_duplicates(erase_dup)
-        .require_same_orientation(req_same_orientation));
-  QApplication::restoreOverrideCursor();
-
- // CGAL::Three::Three::information(
-}
-
 CGAL::Three::Scene_item::Header_data Scene_polygon_soup_item::header() const
 {
   CGAL::Three::Scene_item::Header_data data;
diff --git a/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.h b/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.h
index 5dea8c11f02..9fd1aed124f 100644
--- a/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.h
+++ b/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.h
@@ -187,6 +187,7 @@ public Q_SLOTS:
     bool exportAsSurfaceMesh(SMesh*);
     void inside_out();
     void repair(bool erase_dup, bool req_same_orientation);
+    bool triangulate();
 
     void setDisplayNonManifoldEdges(const bool);
     bool displayNonManifoldEdges() const;