diff --git a/Installation/cmake/modules/FindLibSSH.cmake b/Installation/cmake/modules/FindLibSSH.cmake
new file mode 100644
index 00000000000..e2c49ee2fce
--- /dev/null
+++ b/Installation/cmake/modules/FindLibSSH.cmake
@@ -0,0 +1,39 @@
+# - Try to find the LibSSH libraries
+# This module defines:
+#  LIBSSH_FOUND             - system has LibSSH lib
+#  LIBSSH_INCLUDE_DIR       - the LibSSH include directory
+#  LIBSSH_LIBRARIES_DIR     - directory where the LibSSH libraries are located
+#  LIBSSH_LIBRARIES         - Link these to use LibSSH
+
+
+include(FindPackageHandleStandardArgs)
+include(${CMAKE_CURRENT_LIST_DIR}/CGAL_GeneratorSpecificSettings.cmake)
+
+if(LIBSSH_INCLUDE_DIR)
+  set(LIBSSH_in_cache TRUE)
+else()
+  set(LIBSSH_in_cache FALSE)
+endif()
+if(NOT LIBSSH_LIBRARIES)
+  set(LIBSSH_in_cache FALSE)
+endif()
+
+# Is it already configured?
+if( NOT LIBSSH_in_cache )
+
+  find_path(LIBSSH_INCLUDE_DIR
+    NAMES "libssh/libssh.h"
+    )
+
+  find_library(LIBSSH_LIBRARIES NAMES ssh libssh
+    HINTS "/usr/lib"
+    "usr/lib/x86_64-linux-gnu"
+    PATH_SUFFIXES lib
+    DOC "Path to the LIBSSH library"
+    )
+endif()
+
+SET(LIBSSH_FOUND TRUE)
+if( NOT LIBSSH_LIBRARIES OR NOT LIBSSH_INCLUDE_DIR)
+  SET(LIBSSH_FOUND FALSE)
+endif()
diff --git a/Polyhedron/demo/Polyhedron/CMakeLists.txt b/Polyhedron/demo/Polyhedron/CMakeLists.txt
index 1b1cd817152..7b17019b1d0 100644
--- a/Polyhedron/demo/Polyhedron/CMakeLists.txt
+++ b/Polyhedron/demo/Polyhedron/CMakeLists.txt
@@ -64,7 +64,7 @@ include(${CGAL_USE_FILE})
 find_package(Qt5
              QUIET
              COMPONENTS            OpenGL Script
-             OPTIONAL_COMPONENTS   ScriptTools)
+             OPTIONAL_COMPONENTS   ScriptTools WebSockets)
 
 if(Qt5_FOUND)
 
@@ -95,6 +95,11 @@ if( POLYHEDRON_DEMO_ACTIVATE_CONCURRENCY )
   endif()
 endif()
 
+#find libssh for scene sharing
+find_package(LibSSH)
+if( NOT LIBSSH_FOUND )
+  message("NOTICE : The SSH features will be disabled.")
+endif()
 
 # Activate concurrency ? (turned OFF by default)
 option(CGAL_ACTIVATE_CONCURRENT_MESH_3
@@ -131,7 +136,7 @@ if(CGAL_Qt5_FOUND AND Qt5_FOUND)
   qt5_wrap_ui( statisticsUI_FILES Statistics_on_item_dialog.ui)
   qt5_wrap_ui( FileLoaderDialogUI_files FileLoaderDialog.ui )
   qt5_wrap_ui( Show_point_dialogUI_FILES Show_point_dialog.ui )
-  qt5_wrap_ui( PreferencesUI_FILES   Preferences.ui Details.ui)
+  qt5_wrap_ui( PreferencesUI_FILES   Preferences.ui Details.ui SSH_dialog.ui)
   qt5_wrap_ui( Show_point_dialogUI_FILES Show_point_dialog.ui )
   qt5_wrap_ui( ViewerUI_FILES  LightingDialog.ui)
   qt5_generate_moc( "File_loader_dialog.h" "${CMAKE_CURRENT_BINARY_DIR}/File_loader_dialog_moc.cpp" )
@@ -195,6 +200,11 @@ if(CGAL_Qt5_FOUND AND Qt5_FOUND)
   target_link_libraries(demo_framework
     PUBLIC Qt5::OpenGL Qt5::Widgets Qt5::Gui Qt5::Script
     )
+  if(TARGET Qt5::WebSockets)
+    target_link_libraries(demo_framework PUBLIC Qt5::WebSockets)
+    message(STATUS "Qt5WebSockets was found. Using WebSockets is therefore possible.")
+  endif()
+
   cgal_add_compilation_test(demo_framework)
   # Let's define `three_EXPORT` during the compilation of `demo_framework`,
   # in addition of `demo_framework_EXPORT` (defined automatically by
@@ -329,11 +339,20 @@ if(CGAL_Qt5_FOUND AND Qt5_FOUND)
     MainWindow.cpp
     Polyhedron_demo.cpp
     File_loader_dialog_moc.cpp
+    Use_ssh.cpp
     ${CGAL_Qt5_RESOURCE_FILES} ${CGAL_Qt5_MOC_FILES}
     ${FileLoaderDialogUI_files} ${MainWindowUI_files} ${PreferencesUI_FILES} 
     ${statisticsUI_FILES} ${SubViewerUI_files})
   target_link_libraries(polyhedron_demo PUBLIC
     demo_framework point_dialog Qt5::Gui Qt5::OpenGL Qt5::Widgets Qt5::Script)
+  if(LIBSSH_FOUND)
+    add_definitions(-DCGAL_USE_SSH)
+    target_link_libraries(polyhedron_demo PUBLIC ${LIBSSH_LIBRARIES})
+  endif() #libssh
+  if(TARGET Qt5::WebSockets)
+    add_definitions(-DCGAL_USE_WEBSOCKETS)
+    target_link_libraries(polyhedron_demo PUBLIC Qt5::WebSockets)
+  endif()
   add_executable  ( Polyhedron_3 Polyhedron_3.cpp )
   target_link_libraries( Polyhedron_3 PRIVATE polyhedron_demo )
   add_to_cached_list( CGAL_EXECUTABLE_TARGETS Polyhedron_3 )
diff --git a/Polyhedron/demo/Polyhedron/MainWindow.cpp b/Polyhedron/demo/Polyhedron/MainWindow.cpp
index 2230abc1f1a..d8872fd851f 100644
--- a/Polyhedron/demo/Polyhedron/MainWindow.cpp
+++ b/Polyhedron/demo/Polyhedron/MainWindow.cpp
@@ -1,3 +1,6 @@
+#ifdef CGAL_USE_SSH
+#  include "CGAL/Use_ssh.h"
+#endif
 #include <cmath>
 
 #include "config.h"
@@ -43,6 +46,7 @@
 #include <QWidgetAction>
 #include <QJsonArray>
 #include <QSequentialIterable>
+#include <QDir>
 #ifdef QT_SCRIPT_LIB
 #  include <QScriptValue>
 #  ifdef QT_SCRIPTTOOLS_LIB
@@ -59,6 +63,7 @@
 #include "ui_Preferences.h"
 #include "ui_Details.h"
 #include "ui_Statistics_on_item_dialog.h"
+#include "ui_SSH_dialog.h"
 #include "Show_point_dialog.h"
 #include "File_loader_dialog.h"
 #include "Viewer.h"
@@ -70,6 +75,14 @@
 #  include <QScriptEngine>
 #  include <QScriptValue>
 #include "Color_map.h"
+
+
+#ifdef CGAL_USE_WEBSOCKETS
+#include <QWebSocketServer>
+#include <QWebSocket>
+#include <QNetworkInterface>
+#endif
+
 using namespace CGAL::Three;
 QScriptValue
 myScene_itemToScriptValue(QScriptEngine *engine,
@@ -151,6 +164,7 @@ MainWindow::MainWindow(const QStringList &keywords, bool verbose, QWidget* paren
   // remove the Load Script menu entry, when the demo has not been compiled with QT_SCRIPT_LIB
 #if !defined(QT_SCRIPT_LIB)
   ui->menuBar->removeAction(ui->actionLoadScript);
+  ui->menuBar->removeAction(ui->on_actionLoad_a_Scene_from_a_Script_File);
 #endif
   // Save some pointers from ui, for latter use.
   sceneView = ui->sceneView;
@@ -159,9 +173,9 @@ MainWindow::MainWindow(const QStringList &keywords, bool verbose, QWidget* paren
   CGAL::Three::Three::s_mainviewer = viewer;
   viewer->setObjectName("mainViewer");
   viewer_window->showMaximized();
-  viewer_window->setWindowFlags( 
+  viewer_window->setWindowFlags(
         Qt::SubWindow
-        | Qt::CustomizeWindowHint 
+        | Qt::CustomizeWindowHint
         | Qt::WindowMaximizeButtonHint
         | Qt::WindowSystemMenuHint
         | Qt::WindowTitleHint
@@ -354,7 +368,7 @@ MainWindow::MainWindow(const QStringList &keywords, bool verbose, QWidget* paren
 
   // Load plugins, and re-enable actions that need it.
   operationSearchBar.setPlaceholderText("Filter...");
-  searchAction->setDefaultWidget(&operationSearchBar);  
+  searchAction->setDefaultWidget(&operationSearchBar);
   connect(&operationSearchBar, &QLineEdit::textChanged,
           this, [=](){filterOperations(true);});
   loadPlugins();
@@ -690,7 +704,7 @@ bool MainWindow::load_plugin(QString fileName, bool blacklisted)
     else{
       //qdebug << "error: " << qPrintable(loader.errorString());
       pluginsStatus_map[name] = loader.errorString();
-      
+
     }
     PathNames_map[name].push_back(fileinfo.absoluteDir().absolutePath());
     return true;
@@ -934,7 +948,7 @@ void MainWindow::viewerShow(float xmin,
 }
 
 void MainWindow::viewerShow(Viewer_interface* vi, float x, float y, float z) {
-  
+
   CGAL::qglviewer::ManipulatedCameraFrame backup_frame(*vi->camera()->frame());
   vi->camera()->fitSphere(CGAL::qglviewer::Vec(x, y, z),
                           vi->camera()->sceneRadius()/100);
@@ -1001,20 +1015,21 @@ void MainWindow::computeViewerBBox(CGAL::qglviewer::Vec& min, CGAL::qglviewer::V
   const double xmax = bbox.xmax();
   const double ymax = bbox.ymax();
   const double zmax = bbox.zmax();
-  
-  
-  
+
+
+
   min = CGAL::qglviewer::Vec(xmin, ymin, zmin);
   max= CGAL::qglviewer::Vec(xmax, ymax, zmax);
-  
+
   CGAL::qglviewer::Vec bbox_center((xmin+xmax)/2, (ymin+ymax)/2, (zmin+zmax)/2);
+  
   double bbox_diag = CGAL::approximate_sqrt(
         CGAL::square(xmax - xmin)
         + CGAL::square(ymax - ymin)
         + CGAL::square(zmax - zmin));
   
   CGAL::qglviewer::Vec offset(0,0,0);
-  
+
   double l_dist = (std::max)((std::abs)(bbox_center.x - viewer->offset().x),
                              (std::max)((std::abs)(bbox_center.y - viewer->offset().y),
                                         (std::abs)(bbox_center.z - viewer->offset().z)));
@@ -1240,7 +1255,7 @@ void MainWindow::open(QString filename)
   settings.setValue("OFF open directory",
                     fileinfo.absoluteDir().absolutePath());
   loadItem(fileinfo, findLoader(load_pair.first), ok);
- 
+
   if(!ok)
     return;
   this->addToRecentFiles(fileinfo.absoluteFilePath());
@@ -1427,7 +1442,7 @@ void MainWindow::selectionChanged()
   {
     if(vi == NULL)
       continue;
-    
+
     if(item != NULL && item->manipulatable()) {
       vi->setManipulatedFrame(item->manipulatedFrame());
     } else {
@@ -1562,7 +1577,7 @@ void MainWindow::showSceneContextMenu(const QPoint& p) {
               menu_actions["line width"] = action->menu()->actions().last();
             }
           }
-          
+
         }
         Q_FOREACH(Scene::Item_id index, scene->selectionIndices())
         {
@@ -1595,7 +1610,7 @@ void MainWindow::showSceneContextMenu(const QPoint& p) {
                   )->value());
             slider->setOrientation(Qt::Horizontal);
             sliderAction->setDefaultWidget(slider);
-            
+
             connect(slider, &QSlider::valueChanged, [this, slider]()
             {
               Q_FOREACH(Scene::Item_id id, scene->selectionIndices())
@@ -1630,7 +1645,7 @@ void MainWindow::showSceneContextMenu(const QPoint& p) {
                   )->value());
             slider->setOrientation(Qt::Horizontal);
             sliderAction->setDefaultWidget(slider);
-            
+
             connect(slider, &QSlider::valueChanged, [this, slider]()
             {
               Q_FOREACH(Scene::Item_id id, scene->selectionIndices())
@@ -1665,7 +1680,7 @@ void MainWindow::showSceneContextMenu(const QPoint& p) {
                   )->value());
             slider->setOrientation(Qt::Horizontal);
             sliderAction->setDefaultWidget(slider);
-            
+
             connect(slider, &QSlider::valueChanged, [this, slider]()
             {
               Q_FOREACH(Scene::Item_id id, scene->selectionIndices())
@@ -1708,7 +1723,7 @@ void MainWindow::showSceneContextMenu(const QPoint& p) {
                   )->value());
             slider->setOrientation(Qt::Horizontal);
             sliderAction->setDefaultWidget(slider);
-            
+
             connect(slider, &QSlider::valueChanged, [this, slider]()
             {
               Q_FOREACH(Scene::Item_id id, scene->selectionIndices())
@@ -1832,6 +1847,7 @@ void MainWindow::readSettings()
     this->default_point_size = settings.value("points_size").toInt();
     this->default_normal_length = settings.value("normals_length").toInt();
     this->default_lines_width = settings.value("lines_width").toInt();
+    setProperty("ws_url", settings.value("ws_server_url").toString());
 }
 
 void MainWindow::writeSettings()
@@ -1906,14 +1922,7 @@ void MainWindow::throw_exception() {
 void MainWindow::on_actionLoadScript_triggered()
 {
 #if defined(QT_SCRIPT_LIB)
-  QString filename = QFileDialog::getOpenFileName(
-        this,
-        tr("Select a script to run..."),
-        ".",
-        "QTScripts (*.js);;All Files (*)");
-  if(filename.isEmpty())
-    return;
-  loadScript(QFileInfo(filename));
+
 #endif
 }
 
@@ -1943,7 +1952,7 @@ void MainWindow::on_actionLoad_triggered()
       filters << filter;
     }
   }
-  
+
   QString directory = settings.value("OFF open directory",
                                      QDir::current().dirName()).toString();
 
@@ -1971,7 +1980,7 @@ void MainWindow::on_actionLoad_triggered()
                     static_cast<unsigned>(nb_files),
                     std::back_inserter(colors_));
   std::size_t nb_item = -1;
-  
+
   Q_FOREACH(const QString& filename, dialog.selectedFiles()) {
 
     CGAL::Three::Scene_item* item = NULL;
@@ -2216,7 +2225,6 @@ void MainWindow::on_actionPreferences_triggered()
   QDialog dialog(this);
   Ui::PreferencesDialog prefdiag;
   prefdiag.setupUi(&dialog);
-  
   float lineWidth[2];
   if(!viewer->isOpenGL_4_3())
     viewer->glGetFloatv(GL_LINE_WIDTH_RANGE, lineWidth);
@@ -2227,22 +2235,22 @@ void MainWindow::on_actionPreferences_triggered()
   }
   prefdiag.linesHorizontalSlider->setMinimum(lineWidth[0]);
   prefdiag.linesHorizontalSlider->setMaximum(lineWidth[1]);
-  
+
   prefdiag.offset_updateCheckBox->setChecked(
         settings.value("offset_update", false).toBool());
   connect(prefdiag.offset_updateCheckBox, SIGNAL(toggled(bool)),
           scene, SLOT(enableVisibilityRecentering(bool)));
-  
+
   prefdiag.antialiasingCheckBox->setChecked(settings.value("antialiasing", false).toBool());
   connect(prefdiag.antialiasingCheckBox, SIGNAL(toggled(bool)),
           viewer, SLOT(setAntiAliasing(bool)));
-  
+
   prefdiag.quick_cameraCheckBox->setChecked(
         settings.value("quick_camera_mode", true).toBool());
   connect(prefdiag.quick_cameraCheckBox, SIGNAL(toggled(bool)),
           viewer, SLOT(setFastDrawing(bool)));
   prefdiag.max_itemsSpinBox->setValue(viewer->textRenderer()->getMax_textItems());
-  
+
   connect(prefdiag.max_itemsSpinBox,static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged),
           this, [this](int i){
     setMaxTextItemsDisplayed(i);
@@ -2273,20 +2281,20 @@ void MainWindow::on_actionPreferences_triggered()
   });
   connect(prefdiag.background_colorPushButton, &QPushButton::clicked,
           this, &MainWindow::setBackgroundColor);
-  
+
   connect(prefdiag.default_save_asPushButton, &QPushButton::clicked,
           this, &MainWindow::setDefaultSaveDir);
-  
+
   connect(prefdiag.lightingPushButton, &QPushButton::clicked,
           this, &MainWindow::setLighting_triggered);
-  
+
   prefdiag.surface_meshComboBox->setCurrentText(CGAL::Three::Three::modeName(
                                                   CGAL::Three::Three::s_defaultSMRM));
   connect(prefdiag.surface_meshComboBox, &QComboBox::currentTextChanged,
           this, [this](const QString& text){
     this->s_defaultSMRM = CGAL::Three::Three::modeFromName(text);
   });
-  
+
   prefdiag.point_setComboBox->setCurrentText(CGAL::Three::Three::modeName(
                                                CGAL::Three::Three::s_defaultPSRM));
   connect(prefdiag.point_setComboBox, &QComboBox::currentTextChanged,
@@ -2360,6 +2368,70 @@ void MainWindow::on_actionPreferences_triggered()
     });
     dialog.exec();
   });
+  connect(prefdiag.sshButton, &QPushButton::clicked,
+          this, [this](){
+    QDialog dialog(this);
+    Ui::SSHDialog sshdiag;
+    sshdiag.setupUi(&dialog);
+
+#ifdef CGAL_USE_SSH
+    sshdiag.userBox->setEnabled(true);
+    sshdiag.serverBox->setEnabled(true);
+    sshdiag.pkBox->setEnabled(true);
+    sshdiag.privkBox->setEnabled(true);
+    sshdiag.userEdit->setText(settings.value("ssh_user", QString()).toString());
+    sshdiag.serverEdit->setText(settings.value("ssh_server", QString()).toString());
+    sshdiag.publicEdit->setText(settings.value("ssh_public_key", QString()).toString());
+    sshdiag.privkEdit->setText(settings.value("ssh_priv_key", QString()).toString());
+    connect(sshdiag.pubButton, &QPushButton::clicked,
+            this, [this, sshdiag](){
+      QFileDialog diag(this,
+                       "Public Key",
+                       "",
+                       "All Files (*)");
+      diag.setFilter(QDir::Hidden|QDir::Files|QDir::Dirs|QDir::NoDotAndDotDot);
+      if(!diag.exec())
+        return;
+      sshdiag.publicEdit->setText(diag.selectedFiles().front());
+    });
+    connect(sshdiag.privButton, &QPushButton::clicked,
+            this, [this, sshdiag](){
+      QFileDialog diag(this,
+                       "Private Key",
+                       "",
+                       "All Files (*)");
+      diag.setFilter(QDir::Hidden|QDir::Files|QDir::Dirs|QDir::NoDotAndDotDot);
+      if(!diag.exec())
+        return;
+      sshdiag.privkEdit->setText(diag.selectedFiles().front());
+    });
+#else
+    sshdiag.userBox->setEnabled(false);
+    sshdiag.serverBox->setEnabled(false);
+    sshdiag.pkBox->setEnabled(false);
+    sshdiag.privkBox->setEnabled(false);
+#endif
+    sshdiag.wsEdit->setText(settings.value("ws_server_url", QString()).toString());
+
+    dialog.exec();
+    if ( dialog.result() )
+    {
+#ifdef CGAL_USE_SSH
+      settings.setValue("ssh_user",
+                        sshdiag.userEdit->text());
+      settings.setValue("ssh_server",
+                        sshdiag.serverEdit->text());
+      settings.setValue("ssh_public_key",
+                        sshdiag.publicEdit->text());
+      settings.setValue("ssh_priv_key",
+                        sshdiag.privkEdit->text());
+#endif
+      settings.setValue("ws_server_url",
+                        sshdiag.wsEdit->text());
+      setProperty("ws_url", sshdiag.wsEdit->text());
+    }
+  });
+
   dialog.exec();
 
   if ( dialog.result() )
@@ -2372,7 +2444,7 @@ void MainWindow::on_actionPreferences_triggered()
       if (item->checkState(0)==Qt::Unchecked)
         plugin_blacklist.insert(item->text(1));
     }
-    
+
     //write settings
     settings.setValue("antialiasing",
                       prefdiag.antialiasingCheckBox->isChecked());
@@ -2392,7 +2464,7 @@ void MainWindow::on_actionPreferences_triggered()
     settings.setValue("points_size", this->default_point_size);
     settings.setValue("normals_length", this->default_normal_length);
     settings.setValue("lines_width", this->default_lines_width);
-    
+
   }
   else
   {
@@ -2412,7 +2484,7 @@ void MainWindow::setBackgroundColor()
       v->update();
     }
   }
-  
+
 }
 
 void MainWindow::setLighting_triggered()
@@ -2574,7 +2646,7 @@ QString MainWindow::get_item_stats()
   Q_FOREACH(int id, scene->selectionIndices())
   {
     Scene_item* item = scene->item(id);
-    QString classname = item->property("classname").toString(); 
+    QString classname = item->property("classname").toString();
     if(classname.isEmpty())
        classname = item->metaObject()->className();
     if(!classnames.contains(classname))
@@ -2801,53 +2873,183 @@ void MainWindow::propagate_action()
   }
 }
 
+QString make_fullpath(const QString& filename, bool duplicate = false)
+{
+  QString fullpath = QString("%1/%2").arg(QDir::tempPath()).arg(filename);
+  QString tmp_fullpath = fullpath;
+  if(duplicate)
+  {
+    int i=0;
+    while(QFileInfo(tmp_fullpath).exists())
+    {
+      QString basename = QFileInfo(tmp_fullpath).baseName();
+      QString dir = QFileInfo(tmp_fullpath).dir().path();
+      QString suffix= QFileInfo(fullpath).completeSuffix();
+      tmp_fullpath=QString("%1/%2%3.%4").arg(dir).arg(basename).arg(++i).arg(suffix);
+    }
+  }
+  return tmp_fullpath;
+}
+/*
+ The two following functions allow to create files from string and strings from files.
+ This is used as a workaround of the absence of stream management in our IO system.
+ The whole to/from Base64 is used to avoid problems with binary formats. Everything is written
+ as a base64 binary string, and converted back to what it was.
+*/
+QByteArray file_to_string(const char* filename)
+{
+  std::ifstream f(filename, std::ifstream::binary);
+  // get size of file
+  f.seekg (0,f.end);
+  long size = f.tellg();
+  f.seekg (0);
+  std::ostringstream ss;
+  // allocate memory for file content
+    char* buffer = new char[size];
+
+    // read content of infile
+    f.read(buffer,size);
+
+    // write to outfile
+    ss.write(buffer,size);
+    // release dynamically-allocated memory
+    delete[] buffer;
+  //ss.write( << f.rdbuf(); // reading data
+  f.close();
+  std::string st = ss.str();
+  QByteArray ba(st.c_str(), static_cast<int>(st.size()));
+  return ba;
+}
+
+QString MainWindow::write_string_to_file(const QString& str, const QString &filename)
+{
+  QString fullpath = make_fullpath(filename);
+  std::ofstream f(fullpath.toStdString().c_str(), std::ofstream::binary);
+  QByteArray compressed_item(str.toStdString().c_str());
+  QByteArray item = qUncompress(QByteArray::fromBase64(compressed_item));
+  QByteArray bb = item;
+  f.write(bb.constData(),bb.toStdString().size());
+  f.close();
+  return fullpath;
+}
+
 void MainWindow::on_actionSa_ve_Scene_as_Script_triggered()
 {
-  QString filename =
-      QFileDialog::getSaveFileName(this,
-                                   "Save the Scene as a Script File",
-                                   last_saved_dir,
-                                   "Qt Script files (*.js)");
-  std::ofstream os(filename.toUtf8());
+  if(scene->numberOfEntries() == 0)
+    return;
+  bool do_upload = false;
+#ifdef CGAL_USE_SSH
+  QString user = settings.value("ssh_user", QString()).toString();
+  QString pass;
+  if(!user.isEmpty())
+  {
+    QMessageBox::StandardButton doyou =
+        QMessageBox::question(this, tr("Upload ?"), tr("Do you wish to upload the scene"
+                                                       " using the SSH preferences ?"));
+    bool ok;
+    do_upload = (doyou == QMessageBox::Yes);
+    if(do_upload)
+    {
+      pass = QInputDialog::getText(this, "SSH Password",
+                                   "Enter ssh key password:",
+                                   QLineEdit::Password,
+                                   tr(""),
+                                   &ok);
+      if(!ok)
+        return;
+      pass = pass.trimmed();
+    }
+  }
+#endif
+
+  QString filename;
+
+  if(do_upload){
+    filename = QString("%1/save_scene.js").arg(QDir::tempPath());
+  }else{
+    filename = QFileDialog::getSaveFileName(this,
+                                            "Save the Scene as a Script File",
+                                            last_saved_dir,
+                                            "Qt Script files (*.js)");
+  }
+  std::ofstream os(filename.toUtf8(), std::ofstream::binary);
   if(!os)
     return;
-  std::vector<QString> names;
-  std::vector<QString> loaders;
+  CGAL::Three::Three::CursorScopeGuard cs(Qt::WaitCursor);
+  std::vector<std::pair<QString, QString> > names;
+  std::vector<std::pair<QString, QString> > loaders;
   std::vector<QColor> colors;
   std::vector<int> rendering_modes;
   QStringList not_saved;
   for(int i = 0; i < scene->numberOfEntries(); ++i)
   {
     Scene_item* item = scene->item(i);
-    QString loader = item->property("loader_name").toString();
-    QString source = item->property("source filename").toString();
+    QString loader;// = item->property("loader_name").toString();
+    QString ext;
+    for(Polyhedron_demo_io_plugin_interface* iop : io_plugins)
+    {
+      if(iop->isDefaultLoader(item))
+      {
+        QString sf = iop->saveNameFilters().split(";;").first();
+        //OFF Files (*.off)
+        QRegularExpression re("\\(\\*\\.(.*)\\)");
+        QRegularExpressionMatch rem = re.match(sf);
+        if(!rem.hasMatch())
+          continue;
+        ext = rem.captured(1);
+        QList<Scene_item*>to_save;
+        to_save.append(item);
+        QString savename(tr("%1.%2").arg(item->name()).arg(ext));
+        QString fullpath = make_fullpath(savename, true);
+        savename = QFileInfo(fullpath).fileName();
+        iop->save(QFileInfo(fullpath), to_save);
+        names.push_back(std::make_pair(savename, item->name()));
+        loader=iop->name();
+        break;
+      }
+    }
     if(loader.isEmpty())
     {
-      not_saved.push_back(item->name());
+      QMessageBox::warning(this, "", tr("No plugin found for %1. Not saved.").arg(item->name()));
       continue;
     }
-    names.push_back(source);
-    loaders.push_back(loader);
+    loaders.push_back(std::make_pair(loader, ext));
     colors.push_back(item->color());
     rendering_modes.push_back(item->renderingMode());
   }
+  if(loaders.empty())
+    return;
   //path
   os << "var camera = \""<<viewer->dumpCameraCoordinates().toStdString()<<"\";\n";
   os << "var items = [";
   for(std::size_t i = 0; i< names.size() -1; ++i)
   {
-    os << "\'" << names[i].toStdString() << "\', ";
+    QString fullpath = make_fullpath(names[i].first);
+
+    QByteArray item = file_to_string(fullpath.toStdString().c_str());
+    os<<"[\'";
+    os<<qCompress(item, 9).toBase64().toStdString().c_str();
+    os << "\', \'"<<names[i].second.toStdString().c_str()<<"\']," ;
+    //delete temp file
+    QFile tmp_file(fullpath);
+    tmp_file.remove();
   }
-  os<<"\'"<<names.back().toStdString()<<"\'];\n";
-  
+  QString fullpath = make_fullpath(names.back().first);
+  QByteArray item = file_to_string(fullpath.toStdString().c_str());
+  os<<"[\'";
+  os<<qCompress(item, 9).toBase64().toStdString().c_str();
+  os << "\', \'"<<names.back().second.toStdString().c_str()<<"\']];\n";
+  //delete temp file
+  QFile tmp_file(fullpath);
+  tmp_file.remove();
   //plugin
   os << "var loaders = [";
   for(std::size_t i = 0; i< names.size() -1; ++i)
   {
-    os << "\'" << loaders[i].toStdString() << "\', ";
+    os << "[\'" << loaders[i].first.toStdString() << "\', \'"<<loaders[i].second.toStdString()<< "\'],";
   }
-  os<<"\'"<<loaders.back().toStdString()<<"\'];\n";
-  
+  os << "[\'" << loaders.back().first.toStdString() << "\', \'"<<loaders.back().second.toStdString()<< "\']];\n";
+
   //color
   os << "var colors = [";
   for(std::size_t i = 0; i< names.size() -1; ++i)
@@ -2855,7 +3057,7 @@ void MainWindow::on_actionSa_ve_Scene_as_Script_triggered()
     os << "[" << colors[i].red() <<", "<< colors[i].green() <<", "<< colors[i].blue() <<"], ";
   }
   os<<"[" << colors.back().red() <<", "<< colors.back().green() <<", "<< colors.back().blue() <<"]];\n";
-  
+
   //rendering mode
   os << "var rendering_modes = [";
   for(std::size_t i = 0; i< names.size() -1; ++i)
@@ -2863,10 +3065,13 @@ void MainWindow::on_actionSa_ve_Scene_as_Script_triggered()
     os << rendering_modes[i] << ", ";
   }
   os << rendering_modes.back()<<"];\n";
-  os <<"var initial_scene_size = scene.numberOfEntries;\n";
   os << "items.forEach(function(item, index, array){\n";
-  os << "        main_window.open(item, loaders[index]);\n";
-  os << "        var it = scene.item(initial_scene_size+index);\n";
+  os<<"          var path=items[index][1];\n";
+  os<<"          path+='.';\n";
+  os<<"          path+=loaders[index][1];\n";
+  os<<"          var fullpath = main_window.write_string_to_file(item[0], path);\n";
+  os<<"          main_window.open(fullpath,loaders[index][0]);\n";
+  os << "        var it = scene.item(scene.numberOfEntries-1);\n";
   os << "        var r = colors[index][0];\n";
   os << "        var g = colors[index][1];\n";
   os << "        var b = colors[index][2];\n";
@@ -2880,6 +3085,60 @@ void MainWindow::on_actionSa_ve_Scene_as_Script_triggered()
                          "Items Not  Saved",
                          QString("The following items could not be saved: %1").arg(
                            not_saved.join(", ")));
+#ifdef CGAL_USE_SSH
+  using namespace CGAL::ssh_internal;
+  if(do_upload)
+  {
+    QString server = settings.value("ssh_server", QString()).toString();
+    QString pk = settings.value("ssh_public_key", QString()).toString();
+    QString privK = settings.value("ssh_priv_key", QString()).toString();
+    user = user.trimmed();
+    server = server.trimmed();
+    pk = pk.trimmed();
+    privK=privK.trimmed();
+    if(user.isEmpty()){
+      return;
+    }
+    QString path;
+    path = QInputDialog::getText(this,
+                                 "",
+                                 tr("Enter the destination path for your file."));
+    if(path.isEmpty())
+      return;
+    try{
+      ssh_session session;
+      bool res = establish_ssh_session(session,
+                            user.toStdString().c_str(),
+                            server.toStdString().c_str(),
+                            pk.toStdString().c_str(),
+                            privK.toStdString().c_str(),
+                            pass.toStdString().c_str());
+      if(!res)
+      {
+        QMessageBox::warning(this,
+                             "Error",
+                             "The SSH session could not be started.");
+        return;
+      }
+      res = push_file(session,path.toStdString().c_str(), filename.toStdString().c_str());
+      if(!res)
+      {
+        QMessageBox::warning(this,
+                             "Error",
+                             "The file could not be uploaded. Check your console for more information.");
+        close_connection(session);
+        return;
+      }
+      close_connection(session);
+      QFile tmp_file(filename);
+      tmp_file.remove();
+    } catch( ssh::SshException e )
+    {
+      std::cout << "Error during connection : ";
+      std::cout << e.getError() << std::endl;
+    }
+  }
+#endif
 }
 void MainWindow::setTransparencyPasses(int val)
 {
@@ -2907,7 +3166,7 @@ void MainWindow::toggleFullScreen()
       dock->show();
     }
     visibleDockWidgets.clear();
-    
+
   }
 }
 
@@ -2930,7 +3189,7 @@ void MainWindow::setupViewer(Viewer* viewer, SubViewer* subviewer)
           viewer, SLOT(update()));
   connect(scene, SIGNAL(updated()),
           viewer, SLOT(update()));
-  
+
   QAction* action = subviewer->findChild<QAction*>("actionRecenter");
   connect(action, SIGNAL(triggered()),
           viewer, SLOT(update()));
@@ -2992,16 +3251,43 @@ void MainWindow::setupViewer(Viewer* viewer, SubViewer* subviewer)
           this, SLOT(selectSceneItem(int)));
   connect(viewer, SIGNAL(selectedPoint(double, double, double)),
           this, SLOT(showSelectedPoint(double, double, double)));
-  
+
   connect(viewer, SIGNAL(selectionRay(double, double, double,
                                       double, double, double)),
           scene, SIGNAL(selectionRay(double, double, double,
                                      double, double, double)));
-  
+
   connect(viewer, &Viewer::sendMessage,
           this, [](QString s){
     information(s);
   });
+
+#ifdef CGAL_USE_WEBSOCKETS
+  action= subviewer->viewer->findChild<QAction*>("actionShareCamera");
+  connect(action, &QAction::toggled,
+          this, [this, viewer](bool b)
+  {
+    if(!viewer){
+      return;
+    }
+    QString session;
+    if(b){
+      bool ok;
+      session = QInputDialog::getText(
+            this,"Session",
+            "Please enter the session name.\n"
+            "Only the machines that enter the same session name will be connected.\n"
+            "Several sessions can run simultaneously on a same server. ",
+            QLineEdit::Normal, QString(), &ok);
+      if(session.isEmpty() || !ok)
+      {
+        viewer->setShareCam(false, session);
+        return;
+      }
+    }
+    viewer->setShareCam(b, session);
+  });
+#endif
   
 }
 
@@ -3021,7 +3307,7 @@ void MainWindow::on_actionAdd_Viewer_triggered()
     scene->removeViewer(viewer2);
     viewerDestroyed(viewer2);
   });
-  
+
   setupViewer(viewer2, subviewer);
   viewer2->camera()->interpolateToFitScene();
   subviewer->show();
@@ -3154,11 +3440,20 @@ SubViewer::SubViewer(QWidget *parent, MainWindow* mw, Viewer* mainviewer)
   QAction* actionTotalPass = new QAction("Set Transparency Pass &Number...",this);
   actionTotalPass->setObjectName("actionTotalPass");
   viewMenu->addAction(actionTotalPass);
+#ifdef CGAL_USE_WEBSOCKETS
+  QAction* actionShareCamera= new QAction("Join &WS Server",viewer);
+  actionShareCamera->setObjectName("actionShareCamera");
+  actionShareCamera->setCheckable(true);
+  actionShareCamera->setChecked(false);
+  viewMenu->addAction(actionShareCamera);
+#endif
+
   QAction* actionBackFrontShading = new QAction("Activate Back/Front shading.",this);
   actionBackFrontShading->setObjectName("actionBackFrontShading");
   actionBackFrontShading->setCheckable(true);
   actionBackFrontShading->setChecked(false);
   viewMenu->addAction(actionBackFrontShading);
+
   if(mainviewer)
     setAttribute(Qt::WA_DeleteOnClose);
   setWindowIcon(QIcon(":/cgal/icons/resources/menu.png"));
@@ -3206,7 +3501,7 @@ void SubViewer::color()
 
 void SubViewer::closeEvent(QCloseEvent *closeEvent)
 {
-  
+
   if(is_main)
   {
     QMessageBox::information(mw, "", "This is the main viewer. It cannot be closed.");
@@ -3227,9 +3522,9 @@ void SubViewer::changeEvent(QEvent *event)
       {
         menu->addAction(action);
       }
-      setWindowFlags( 
+      setWindowFlags(
               Qt::SubWindow
-              | Qt::CustomizeWindowHint 
+              | Qt::CustomizeWindowHint
               | Qt::WindowMaximizeButtonHint
               //| Qt::WindowSystemMenuHint
               | Qt::WindowTitleHint
@@ -3245,9 +3540,9 @@ void SubViewer::changeEvent(QEvent *event)
       {
         menu->removeAction(action);
       }
-      setWindowFlags( 
+      setWindowFlags(
               Qt::SubWindow
-              | Qt::CustomizeWindowHint 
+              | Qt::CustomizeWindowHint
               | Qt::WindowMaximizeButtonHint
               | Qt::WindowSystemMenuHint
               | Qt::WindowTitleHint
@@ -3269,7 +3564,7 @@ void MainWindow::invalidate_bbox(bool do_recenter)
 
 void MainWindow::on_action_Save_triggered()
 {
-  if(QMessageBox::question(this, "Save", "Are you sure you want to override these files ?") 
+  if(QMessageBox::question(this, "Save", "Are you sure you want to override these files ?")
      == QMessageBox::No)
     return;
   QList<Scene_item*> to_save;
@@ -3285,3 +3580,187 @@ void MainWindow::on_action_Save_triggered()
     }
   }
 }
+
+void MainWindow::on_actionLoad_a_Scene_from_a_Script_File_triggered()
+{
+  bool do_download = false;
+  QString filename;
+
+#ifdef CGAL_USE_SSH
+  QString user = settings.value("ssh_user", QString()).toString();
+  QString pass;
+  if(!user.isEmpty())
+  {
+    QMessageBox::StandardButton doyou =
+        QMessageBox::question(this, tr("Download ?"), tr("Do you wish to download the scene"
+                                                         " using the SSH preferences ?"));
+    bool ok;
+    do_download= (doyou == QMessageBox::Yes);
+    if(do_download)
+    {
+      pass = QInputDialog::getText(this, "SSH Password",
+                                   "Enter ssh key password:",
+                                   QLineEdit::Password,
+                                   tr(""),
+                                   &ok);
+      if(!ok)
+        return;
+      pass = pass.trimmed();
+    }
+  }
+#endif
+
+  if(do_download)
+  {
+    #ifdef CGAL_USE_SSH
+    using namespace CGAL::ssh_internal;
+    QString server = settings.value("ssh_server", QString()).toString();
+    QString pk = settings.value("ssh_public_key", QString()).toString();
+    QString privK = settings.value("ssh_priv_key", QString()).toString();
+    user = user.trimmed();
+    server = server.trimmed();
+    pk = pk.trimmed();
+    privK=privK.trimmed();
+    QString path;
+    path = QInputDialog::getText(this,
+                                 "",
+                                 tr("Enter the remote path for your file."));
+    if(path.isEmpty())
+      return;
+    try{
+      ssh_session session;
+      bool res = establish_ssh_session(session,
+                            user.toStdString().c_str(),
+                            server.toStdString().c_str(),
+                            pk.toStdString().c_str(),
+                            privK.toStdString().c_str(),
+                            pass.toStdString().c_str());
+      if(!res)
+      {
+        QMessageBox::warning(this,
+                             "Error",
+                             "The SSH session could not be started.");
+        return;
+      }
+      filename = QString("%1/load_scene.js").arg(QDir::tempPath());
+      path = tr("/tmp/%2").arg(path);
+      res = pull_file(session,path.toStdString().c_str(), filename.toStdString().c_str());
+      if(!res)
+      {
+        QMessageBox::warning(this,
+                             "Error",
+                             "The file could not be fetched. Check your console for more info.");
+        close_connection(session);
+        return;
+      }
+      close_connection(session);
+    } catch( ssh::SshException e )
+    {
+      std::cout << "Error during connection : ";
+      std::cout << e.getError() << std::endl;
+    }
+    #endif
+  }
+  else
+  {
+    filename =  QFileDialog::getOpenFileName(
+          this,
+          tr("Select a Whole Scene file..."),
+          ".",
+          "Whole Scene files (*.js)");
+    if(filename.isEmpty())
+      return;
+  }
+  loadScript(QFileInfo(filename));
+  if(do_download){
+    QFile tmp_file(filename);
+    tmp_file.remove();
+  }
+}
+
+#ifdef CGAL_USE_WEBSOCKETS
+void MainWindow::on_action_Start_a_Session_triggered()
+{
+  QAction * action= findChild<QAction*>("action_Start_a_Session");
+  static EchoServer *server =nullptr;
+  if(action->isChecked()){
+     server = new EchoServer(1234);
+    QObject::connect(server, &EchoServer::closed, server,&EchoServer::deleteLater);
+  }
+  else
+  {
+    server->deleteLater();
+  }
+}
+
+EchoServer::EchoServer(quint16 port) :
+    QObject(CGAL::Three::Three::mainWindow()),
+    m_pWebSocketServer(new QWebSocketServer(QStringLiteral("Echo Server"),
+                                            QWebSocketServer::NonSecureMode, this))
+{
+    if (m_pWebSocketServer->listen(QHostAddress::Any, port)) {
+        connect(m_pWebSocketServer, &QWebSocketServer::newConnection,
+                this, &EchoServer::onNewConnection);
+        connect(m_pWebSocketServer, &QWebSocketServer::closed, this, &EchoServer::closed);
+    }
+    QHostAddress local_host("0.0.0.0");
+
+    //to avoid printing 127.0.0.1. Not realy sure it won't ever print the external ipv4 though.
+    const QHostAddress &localhost = QHostAddress(QHostAddress::LocalHost);
+    for (const QHostAddress &address: QNetworkInterface::allAddresses()) {
+      if (address.protocol() == QAbstractSocket::IPv4Protocol && address != localhost)
+      {
+        local_host= address;
+        break;
+      }
+    }
+    QMessageBox mb(QMessageBox::NoIcon, "WS Server",
+                   tr("WebSockets Server started.\nEnter the following address in\nyour Network Preferences to be able to join it :\n"
+                      "ws://%1:%2").arg(local_host.toString()).arg(port), QMessageBox::Ok, CGAL::Three::Three::mainWindow());
+    mb.setTextInteractionFlags(Qt::TextSelectableByMouse);
+    mb.exec();
+}
+
+EchoServer::~EchoServer()
+{
+    m_pWebSocketServer->close();
+    qDeleteAll(m_clients.begin(), m_clients.end());
+}
+
+void EchoServer::onNewConnection()
+{
+    QWebSocket *pSocket = m_pWebSocketServer->nextPendingConnection();
+
+    connect(pSocket, &QWebSocket::textMessageReceived, this, &EchoServer::processTextMessage);
+    connect(pSocket, &QWebSocket::binaryMessageReceived, this, &EchoServer::processBinaryMessage);
+    connect(pSocket, &QWebSocket::disconnected, this, &EchoServer::socketDisconnected);
+
+    m_clients << pSocket;
+}
+
+void EchoServer::processTextMessage(QString message)
+{
+    QWebSocket *pClient = qobject_cast<QWebSocket *>(sender());
+    for(auto *client : m_clients) {
+      if(client != pClient)
+        client->sendTextMessage(message);
+    }
+}
+
+void EchoServer::processBinaryMessage(QByteArray message)
+{
+    QWebSocket *pClient = qobject_cast<QWebSocket *>(sender());
+    if (pClient) {
+        pClient->sendBinaryMessage(message);
+    }
+}
+
+void EchoServer::socketDisconnected()
+{
+    QWebSocket *pClient = qobject_cast<QWebSocket *>(sender());
+    if (pClient) {
+        m_clients.removeAll(pClient);
+        pClient->deleteLater();
+    }
+}
+#endif
diff --git a/Polyhedron/demo/Polyhedron/MainWindow.h b/Polyhedron/demo/Polyhedron/MainWindow.h
index e4bd6d5b3b1..b7650b52b34 100644
--- a/Polyhedron/demo/Polyhedron/MainWindow.h
+++ b/Polyhedron/demo/Polyhedron/MainWindow.h
@@ -138,6 +138,8 @@ public Q_SLOTS:
    This slot is for use by scripts.*/
   bool open(QString filename, QString loader_name);
 
+  QString write_string_to_file(const QString &str, const QString& filename);
+
   /*! Reloads an item. Expects to be called by a QAction with the
    index of the item to be reloaded as data attached to the action.
    The index must identify a valid `Scene_item`.*/
@@ -352,6 +354,10 @@ protected Q_SLOTS:
   void save(QString filename, QList<CGAL::Three::Scene_item*>& to_save);
   //!Calls the function saveSnapShot of the viewer.
   void on_actionSaveSnapshot_triggered();
+#ifdef CGAL_USE_WEBSOCKETS
+  //!Starts a new WS server if none is already exist. Else, does nothing.
+  void on_action_Start_a_Session_triggered();
+#endif
   //!Opens a Dialog to choose a color and make it the background color.
   void setBackgroundColor();
   //!Opens a Dialog to change the lighting settings
@@ -447,6 +453,7 @@ public:
 #endif
 public Q_SLOTS:
   void on_actionSa_ve_Scene_as_Script_triggered();
+  void on_actionLoad_a_Scene_from_a_Script_File_triggered();
   void toggleFullScreen();
   void setDefaultSaveDir();
   void invalidate_bbox(bool do_recenter);
@@ -494,4 +501,30 @@ protected:
 private:
   bool is_main;
 };
+#ifdef CGAL_USE_WEBSOCKETS
+QT_FORWARD_DECLARE_CLASS(QWebSocketServer)
+QT_FORWARD_DECLARE_CLASS(QWebSocket)
+
+class EchoServer : public QObject
+{
+    Q_OBJECT
+public:
+    explicit EchoServer(quint16 port);
+    ~EchoServer();
+
+
+Q_SIGNALS:
+    void closed();
+
+private Q_SLOTS:
+    void onNewConnection();
+    void processTextMessage(QString message);
+    void processBinaryMessage(QByteArray message);
+    void socketDisconnected();
+
+private:
+    QWebSocketServer *m_pWebSocketServer;
+    QList<QWebSocket *> m_clients;
+};
+#endif
 #endif // ifndef MAINWINDOW_H
diff --git a/Polyhedron/demo/Polyhedron/MainWindow.ui b/Polyhedron/demo/Polyhedron/MainWindow.ui
index a011dedab64..6273a37bd16 100644
--- a/Polyhedron/demo/Polyhedron/MainWindow.ui
+++ b/Polyhedron/demo/Polyhedron/MainWindow.ui
@@ -58,6 +58,7 @@
     <addaction name="action_Save"/>
     <addaction name="actionSaveAs"/>
     <addaction name="actionSa_ve_Scene_as_Script"/>
+    <addaction name="actionLoad_a_Scene_from_a_Script_File"/>
     <addaction name="actionSaveSnapshot"/>
     <addaction name="separator"/>
     <addaction name="actionLoadScript"/>
@@ -96,6 +97,7 @@
     <addaction name="action_Rearrange_Viewers"/>
     <addaction name="menuDockWindows"/>
     <addaction name="separator"/>
+    <addaction name="action_Start_a_Session"/>
    </widget>
    <addaction name="menuFile"/>
    <addaction name="menuEdit"/>
@@ -463,6 +465,22 @@
     <string>&amp;Save</string>
    </property>
   </action>
+  <action name="actionLoad_a_Scene_from_a_Script_File">
+   <property name="text">
+    <string>Load a Scene &amp;from a Script File...</string>
+   </property>
+  </action>
+  <action name="action_Start_a_Session">
+   <property name="checkable">
+    <bool>true</bool>
+   </property>
+   <property name="text">
+    <string>&amp;Start a Session</string>
+   </property>
+   <property name="toolTip">
+    <string>Start a WebSocket Server to Share your Camera with Others on your Network.</string>
+   </property>
+  </action>
  </widget>
  <resources>
   <include location="Polyhedron_3.qrc"/>
diff --git a/Polyhedron/demo/Polyhedron/Plugins/AABB_tree/Cut_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/AABB_tree/Cut_plugin.cpp
index 0cf39f89ccb..d23ff947d9a 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/AABB_tree/Cut_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/AABB_tree/Cut_plugin.cpp
@@ -860,6 +860,12 @@ public:
     return ok;
   }
 
+  bool isDefaultLoader(const Scene_item* item) const Q_DECL_OVERRIDE{
+    if(qobject_cast<const Scene_edges_item*>(item))
+      return true;
+    return false;
+  }
+
   using Polyhedron_demo_io_plugin_interface::init;
   void init(QMainWindow* mainWindow, CGAL::Three::Scene_interface* scene_interface,
             Messages_interface* m) override;
diff --git a/Polyhedron/demo/Polyhedron/Plugins/IO/3mf_io_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/IO/3mf_io_plugin.cpp
index d2e34e4e00e..90f036e8cea 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/IO/3mf_io_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/IO/3mf_io_plugin.cpp
@@ -78,61 +78,6 @@ class Io_3mf_plugin:
     std::vector<std::string> names;
     QList<Scene_item*> result;
     std::vector<std::vector<CGAL::Color> > all_colors;
-    int nb_polylines =
-        CGAL::read_polylines_from_3mf(fileinfo.filePath().toUtf8().toStdString(),
-                                      all_points, all_colors, names);
-    if(nb_polylines < 0 )
-    {
-      ok = false;
-      std::cerr << "Error in reading of meshes."<<std::endl;
-      return result;
-    }
-
-    for(int i=0; i< nb_polylines; ++i)
-    {
-      Scene_polylines_item* pol_item = new Scene_polylines_item();
-      PolylineRange& polylines = pol_item->polylines;
-      polylines.push_back(all_points[i]);
-      pol_item->setName(names[i].data());
-      pol_item->invalidateOpenGLBuffers();
-      CGAL::Color c = all_colors[i].front();
-      pol_item->setColor(QColor(c.red(), c.green(), c.blue()));
-      pol_item->setProperty("already_colord", true);
-      result << pol_item;
-      if(add_to_scene)
-        CGAL::Three::Three::scene()->addItem(pol_item);
-    }
-    all_points.clear();
-    all_colors.clear();
-    names.clear();
-    int nb_point_sets =
-        CGAL::read_point_clouds_from_3mf(fileinfo.filePath().toUtf8().toStdString(),
-                                         all_points, all_colors, names);
-    if(nb_point_sets < 0 )
-    {
-      ok = false;
-      std::cerr << "Error in reading of meshes."<<std::endl;
-      return result;
-    }
-    for(int i=0; i< nb_point_sets; ++i)
-    {
-      Scene_points_with_normal_item* pts_item = new Scene_points_with_normal_item();
-      for(std::size_t j = 0; j < all_points[i].size(); ++j)
-      {
-        pts_item->point_set()->insert(all_points[i][j]);
-      }
-      pts_item->setName(names[i].data());
-      pts_item->invalidateOpenGLBuffers();
-      CGAL::Color c = all_colors[i].front();
-      pts_item->setColor(QColor(c.red(), c.green(), c.blue()));
-      pts_item->setProperty("already_colord", true);
-      result << pts_item;
-      if(add_to_scene)
-        CGAL::Three::Three::scene()->addItem(pts_item);
-    }
-    all_points.clear();
-    names.clear();
-    all_colors.clear();
     int nb_meshes =
         CGAL::read_triangle_soups_from_3mf(fileinfo.filePath().toUtf8().toStdString(),
                                   all_points, all_polygons, all_colors, names);
diff --git a/Polyhedron/demo/Polyhedron/Plugins/IO/Nef_io_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/IO/Nef_io_plugin.cpp
index 4aab33b4e0a..22b2ed695d4 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/IO/Nef_io_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/IO/Nef_io_plugin.cpp
@@ -15,13 +15,18 @@ class Polyhedron_demo_io_nef_plugin :
   Q_PLUGIN_METADATA(IID "com.geometryfactory.PolyhedronDemo.PluginInterface/1.0" FILE "nef_io_plugin.json")
 
 public:
-  QString nameFilters() const;
-  QString name() const { return "io_nef_plugin"; }
-  bool canLoad(QFileInfo) const;
-  QList<Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true);
+  QString nameFilters() const override;
+  QString name() const override { return "io_nef_plugin"; }
+  bool canLoad(QFileInfo) const override;
+  QList<Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true) override;
 
-  bool canSave(const CGAL::Three::Scene_item*);
-  bool save(QFileInfo fileinfo,QList<CGAL::Three::Scene_item*>& items);
+  bool canSave(const CGAL::Three::Scene_item*) override;
+  bool save(QFileInfo fileinfo,QList<CGAL::Three::Scene_item*>& items) override;
+  bool isDefaultLoader(const Scene_item* item) const override{
+    if(qobject_cast<const Scene_nef_polyhedron_item*>(item))
+      return true;
+    return false;
+  }
 };
 
 QString Polyhedron_demo_io_nef_plugin::nameFilters() const {
diff --git a/Polyhedron/demo/Polyhedron/Plugins/IO/OFF_io_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/IO/OFF_io_plugin.cpp
index a94d0ef2d69..6b195e276c4 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/IO/OFF_io_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/IO/OFF_io_plugin.cpp
@@ -29,28 +29,28 @@ class Polyhedron_demo_off_plugin :
   Q_PLUGIN_METADATA(IID "com.geometryfactory.PolyhedronDemo.IOPluginInterface/1.90" FILE "off_io_plugin.json")
 
 public:
-  bool isDefaultLoader(const Scene_item *item) const
+  bool isDefaultLoader(const Scene_item *item) const override
   {
     if(qobject_cast<const Scene_surface_mesh_item*>(item)
        || qobject_cast<const Scene_polygon_soup_item*>(item))
       return true;
     return false;
   }
-  bool isDefaultLoader(const QString& name) const
+  bool isDefaultLoader(const QString& name) const override
   {
     if(name == QString("off"))
       return true;
     return false;
   }
-  QString name() const { return "off_plugin"; }
-  QString nameFilters() const { return "OFF files (*.off);;Wavefront OBJ (*.obj)"; }
-  bool canLoad(QFileInfo fileinfo) const;
-  QList<Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true);
+  QString name() const override{ return "off_plugin"; }
+  QString nameFilters() const override { return "OFF files (*.off);;Wavefront OBJ (*.obj)"; }
+  bool canLoad(QFileInfo fileinfo) const override;
+  QList<Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true) override;
   CGAL::Three::Scene_item* load_off(QFileInfo fileinfo);
   CGAL::Three::Scene_item* load_obj(QFileInfo fileinfo);
 
-  bool canSave(const CGAL::Three::Scene_item*);
-  bool save(QFileInfo fileinfo,QList<CGAL::Three::Scene_item*>& );
+  bool canSave(const CGAL::Three::Scene_item*) override;
+  bool save(QFileInfo fileinfo,QList<CGAL::Three::Scene_item*>& ) override;
 };
 
 bool Polyhedron_demo_off_plugin::canLoad(QFileInfo) const {
diff --git a/Polyhedron/demo/Polyhedron/Plugins/IO/PLY_io_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/IO/PLY_io_plugin.cpp
index 6ce2fdeb793..75c2e1d9845 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/IO/PLY_io_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/IO/PLY_io_plugin.cpp
@@ -23,19 +23,19 @@ class Polyhedron_demo_ply_plugin :
   Q_PLUGIN_METADATA(IID "com.geometryfactory.PolyhedronDemo.IOPluginInterface/1.90" FILE "ply_io_plugin.json")
 
 public:
-  bool isDefaultLoader(const CGAL::Three::Scene_item *item) const 
+  bool isDefaultLoader(const CGAL::Three::Scene_item *item) const override
   { 
     if(qobject_cast<const Scene_points_with_normal_item*>(item)) 
       return true; 
     return false;
   }
-  QString name() const { return "ply_plugin"; }
-  QString nameFilters() const { return "PLY files (*.ply)"; }
-  bool canLoad(QFileInfo fileinfo) const;
-  QList<Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true);
+  QString name() const override{ return "ply_plugin"; }
+  QString nameFilters() const override{ return "PLY files (*.ply)"; }
+  bool canLoad(QFileInfo fileinfo) const override;
+  QList<Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true)override;
 
-  bool canSave(const CGAL::Three::Scene_item*);
-  bool save(QFileInfo fileinfo,QList<CGAL::Three::Scene_item*>&);
+  bool canSave(const CGAL::Three::Scene_item*)override;
+  bool save(QFileInfo fileinfo,QList<CGAL::Three::Scene_item*>&)override;
 
 };
 
diff --git a/Polyhedron/demo/Polyhedron/Plugins/IO/Polylines_io_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/IO/Polylines_io_plugin.cpp
index d86309749f8..d9fe0b44e0d 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/IO/Polylines_io_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/IO/Polylines_io_plugin.cpp
@@ -75,6 +75,12 @@ public:
     return QList<QAction*>()<<actionSplit_polylines
                             <<actionJoin_polylines;
   }
+  
+  bool isDefaultLoader(const Scene_item* item) const override{
+    if(qobject_cast<const Scene_polylines_item*>(item))
+      return true;
+    return false;
+  }
   protected Q_SLOTS:
   //!Splits the selected Scene_polylines_item in multiple items all containing a single polyline.
   void split();
diff --git a/Polyhedron/demo/Polyhedron/Plugins/IO/VTK_io_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/IO/VTK_io_plugin.cpp
index 1c340b8f2ad..362709853c6 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/IO/VTK_io_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/IO/VTK_io_plugin.cpp
@@ -290,10 +290,11 @@ public:
 
 
   QString nameFilters() const {
-    return "VTK PolyData files (*.vtk);; VTK XML PolyData (*.vtp);; VTK XML UnstructuredGrid (*.vtu)"; }
+    return "VTK XML UnstructuredGrid (*.vtu);;VTK PolyData files (*.vtk);; VTK XML PolyData (*.vtp)"; }
   QString name() const { return "vtk_plugin"; }
   bool canSave(const CGAL::Three::Scene_item* item)
   {
+
     return (qobject_cast<const Scene_facegraph_item*>(item)
             || qobject_cast<const Scene_c3t3_item*>(item));
   }
diff --git a/Polyhedron/demo/Polyhedron/Plugins/IO/lcc_io_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/IO/lcc_io_plugin.cpp
index 71c47452676..55a3a7e1b14 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/IO/lcc_io_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/IO/lcc_io_plugin.cpp
@@ -17,24 +17,24 @@ class LCC_io_plugin :
   Q_PLUGIN_METADATA(IID "com.geometryfactory.PolyhedronDemo.IOPluginInterface/1.90" FILE "lcc_io_plugin.json")
   
 public:
-  bool isDefaultLoader(const CGAL::Three::Scene_item *item) const 
+  bool isDefaultLoader(const CGAL::Three::Scene_item *item) const override
   { 
     if(qobject_cast<const Scene_lcc_item*>(item)) 
       return true; 
     return false;
   }
-  QString name() const { return "lcc_plugin"; }
-  QString nameFilters() const { return 
+  QString name() const override{ return "lcc_plugin"; }
+  QString nameFilters() const override{ return 
         "OFF files (*.off);;"
         "3-map files (*.3map)"; }
   
-  QString saveNameFilters() const {
+  QString saveNameFilters() const override{
     return 
         "3-map files (*.3map)"; 
   }
   
-  bool canLoad(QFileInfo) const { return true; }
-  QList<CGAL::Three::Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true){
+  bool canLoad(QFileInfo) const override{ return true; }
+  QList<CGAL::Three::Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true) override{
     // Open file
     std::ifstream ifs(fileinfo.filePath().toUtf8());
     if(!ifs) {
@@ -67,8 +67,8 @@ public:
   }
   
   
-  bool canSave(const CGAL::Three::Scene_item*){return false;}
-  bool save(QFileInfo, QList<CGAL::Three::Scene_item*>& ){
+  bool canSave(const CGAL::Three::Scene_item*)override{return false;}
+  bool save(QFileInfo, QList<CGAL::Three::Scene_item*>& )override{
     return false;
   }
   
diff --git a/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/C3t3_io_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/C3t3_io_plugin.cpp
index 4a7c004be2b..21a0d5c6207 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/C3t3_io_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/C3t3_io_plugin.cpp
@@ -18,15 +18,20 @@ class Polyhedron_demo_c3t3_binary_io_plugin :
     Q_PLUGIN_METADATA(IID "com.geometryfactory.PolyhedronDemo.IOPluginInterface/1.90" FILE "c3t3_io_plugin.json")
 
 public:
-  QString name() const { return "C3t3_io_plugin"; }
-  QString nameFilters() const { return "binary files (*.cgal);;ascii (*.mesh);;maya (*.ma)"; }
-  QString saveNameFilters() const { return "binary files (*.cgal);;ascii (*.mesh);;maya (*.ma);;avizo (*.am);;OFF files (*.off)"; }
-  QString loadNameFilters() const { return "binary files (*.cgal);;ascii (*.mesh)"; }
-  bool canLoad(QFileInfo) const;
-  QList<Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true);
+  QString name() const override { return "C3t3_io_plugin"; }
+  QString nameFilters() const override { return "binary files (*.cgal);;ascii (*.mesh);;maya (*.ma)"; }
+  QString saveNameFilters() const override { return "binary files (*.cgal);;ascii (*.mesh);;maya (*.ma);;avizo (*.am);;OFF files (*.off)"; }
+  QString loadNameFilters() const override { return "binary files (*.cgal);;ascii (*.mesh)"; }
+  bool canLoad(QFileInfo) const override;
+  QList<Scene_item*> load(QFileInfo fileinfo, bool& ok, bool add_to_scene=true) override;
 
-  bool canSave(const CGAL::Three::Scene_item*);
-  bool save(QFileInfo fileinfo,QList<CGAL::Three::Scene_item*>& );
+  bool canSave(const CGAL::Three::Scene_item*) override;
+  bool save(QFileInfo fileinfo,QList<CGAL::Three::Scene_item*>& ) override;
+  bool isDefaultLoader(const Scene_item* item) const override{
+    if(qobject_cast<const Scene_c3t3_item*>(item))
+      return true;
+    return false;
+  }
 
 private:
   bool try_load_other_binary_format(std::istream& in, C3t3& c3t3);
diff --git a/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/Io_image_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/Io_image_plugin.cpp
index 286642446a0..d9b4fff0ef8 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/Io_image_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/Mesh_3/Io_image_plugin.cpp
@@ -296,6 +296,11 @@ public:
       items.pop_front();
     return ok;
   }
+  bool isDefaultLoader(const Scene_item* item) const override{
+    if(qobject_cast<const Scene_image_item*>(item))
+      return true;
+    return false;
+  }
   QString name() const override{ return "segmented images"; }
 
 
diff --git a/Polyhedron/demo/Polyhedron/Plugins/PMP/Selection_plugin.cpp b/Polyhedron/demo/Polyhedron/Plugins/PMP/Selection_plugin.cpp
index b4864357dd3..be80490894e 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/PMP/Selection_plugin.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/PMP/Selection_plugin.cpp
@@ -127,6 +127,12 @@ public:
       return res;
   }
   
+  bool isDefaultLoader(const Scene_item* item) const override{
+    if(qobject_cast<const Scene_polyhedron_selection_item*>(item))
+      return true;
+    return false;
+  }
+
   bool applicable(QAction* action) const override {
     if(action == actionSelfIntersection)
       return qobject_cast<Scene_face_graph_item*>(scene->item(scene->mainSelectionIndex()));
diff --git a/Polyhedron/demo/Polyhedron/Preferences.ui b/Polyhedron/demo/Polyhedron/Preferences.ui
index 10a7f773f85..358bf1ffbb8 100644
--- a/Polyhedron/demo/Polyhedron/Preferences.ui
+++ b/Polyhedron/demo/Polyhedron/Preferences.ui
@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>631</width>
-    <height>526</height>
+    <height>628</height>
    </rect>
   </property>
   <property name="sizePolicy">
@@ -58,9 +58,9 @@
            <property name="geometry">
             <rect>
              <x>0</x>
-             <y>-96</y>
+             <y>0</y>
              <width>275</width>
-             <height>528</height>
+             <height>534</height>
             </rect>
            </property>
            <layout class="QVBoxLayout" name="verticalLayout_3">
@@ -285,6 +285,16 @@
               </property>
              </widget>
             </item>
+            <item>
+             <widget class="QPushButton" name="sshButton">
+              <property name="enabled">
+               <bool>true</bool>
+              </property>
+              <property name="text">
+               <string>Network Settings</string>
+              </property>
+             </widget>
+            </item>
             <item>
              <widget class="QPushButton" name="backFrontColor_pushButton">
               <property name="text">
diff --git a/Polyhedron/demo/Polyhedron/SSH_dialog.ui b/Polyhedron/demo/Polyhedron/SSH_dialog.ui
new file mode 100644
index 00000000000..0f18f927cb8
--- /dev/null
+++ b/Polyhedron/demo/Polyhedron/SSH_dialog.ui
@@ -0,0 +1,151 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>SSHDialog</class>
+ <widget class="QDialog" name="SSHDialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>415</width>
+    <height>441</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>SSH Settings</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout_2">
+   <item>
+    <layout class="QVBoxLayout" name="verticalLayout">
+     <item>
+      <widget class="QGroupBox" name="groupBox_2">
+       <property name="title">
+        <string>SSH Preferences</string>
+       </property>
+       <layout class="QVBoxLayout" name="verticalLayout_3">
+        <item>
+         <widget class="QGroupBox" name="userBox">
+          <property name="title">
+           <string>User</string>
+          </property>
+          <layout class="QHBoxLayout" name="horizontalLayout">
+           <item>
+            <widget class="QLineEdit" name="userEdit"/>
+           </item>
+          </layout>
+         </widget>
+        </item>
+        <item>
+         <widget class="QGroupBox" name="serverBox">
+          <property name="title">
+           <string>Server</string>
+          </property>
+          <layout class="QHBoxLayout" name="horizontalLayout_2">
+           <item>
+            <widget class="QLineEdit" name="serverEdit"/>
+           </item>
+          </layout>
+         </widget>
+        </item>
+        <item>
+         <widget class="QGroupBox" name="pkBox">
+          <property name="title">
+           <string>Public Key </string>
+          </property>
+          <layout class="QHBoxLayout" name="horizontalLayout_3">
+           <item>
+            <widget class="QLineEdit" name="publicEdit"/>
+           </item>
+           <item>
+            <widget class="QPushButton" name="pubButton">
+             <property name="text">
+              <string>Browse...</string>
+             </property>
+            </widget>
+           </item>
+          </layout>
+         </widget>
+        </item>
+        <item>
+         <widget class="QGroupBox" name="privkBox">
+          <property name="title">
+           <string>Private Key</string>
+          </property>
+          <layout class="QHBoxLayout" name="horizontalLayout_4">
+           <item>
+            <widget class="QLineEdit" name="privkEdit"/>
+           </item>
+           <item>
+            <widget class="QPushButton" name="privButton">
+             <property name="text">
+              <string>Browse...</string>
+             </property>
+            </widget>
+           </item>
+          </layout>
+         </widget>
+        </item>
+       </layout>
+      </widget>
+     </item>
+     <item>
+      <widget class="QGroupBox" name="groupBox">
+       <property name="title">
+        <string>Camera Synchronization Server</string>
+       </property>
+       <layout class="QVBoxLayout" name="verticalLayout_4">
+        <item>
+         <widget class="QLineEdit" name="wsEdit"/>
+        </item>
+       </layout>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QDialogButtonBox" name="buttonBox">
+     <property name="orientation">
+      <enum>Qt::Horizontal</enum>
+     </property>
+     <property name="standardButtons">
+      <set>QDialogButtonBox::Cancel|QDialogButtonBox::Ok</set>
+     </property>
+    </widget>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>accepted()</signal>
+   <receiver>SSHDialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>248</x>
+     <y>254</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>157</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+  <connection>
+   <sender>buttonBox</sender>
+   <signal>rejected()</signal>
+   <receiver>SSHDialog</receiver>
+   <slot>reject()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>316</x>
+     <y>260</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>286</x>
+     <y>274</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>
diff --git a/Polyhedron/demo/Polyhedron/Use_ssh.cpp b/Polyhedron/demo/Polyhedron/Use_ssh.cpp
new file mode 100644
index 00000000000..a1b342eda69
--- /dev/null
+++ b/Polyhedron/demo/Polyhedron/Use_ssh.cpp
@@ -0,0 +1,286 @@
+// Copyright (c) 2020  GeometryFactory (France).  All rights reserved.
+//
+// This file is part of CGAL (www.cgal.org)
+//
+// $URL$
+// $Id$
+// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
+// 
+//
+// Author(s)     : Maxime Gimeno
+
+#ifdef CGAL_USE_SSH
+
+#include <CGAL/Three/Three.h>
+
+#include "CGAL/Use_ssh.h"
+#include <iostream>
+#include <fstream>
+#include <cstring>
+#include <vector>
+#include <chrono>
+#include <thread>
+
+#include <QMessageBox>
+
+bool test_result(int res)
+{
+  switch(res){
+
+  case SSH_AUTH_ERROR:
+  {
+    std::cerr<<"Auth failed with error: "<<std::endl;
+    return false;
+  }
+  case SSH_AUTH_DENIED:
+  {
+    std::cerr<<"The server doesn't accept that public key as an authentication token. Try another key or another method."<<std::endl;
+    return false;
+  }
+  case SSH_AUTH_PARTIAL :
+  {
+    std::cerr<<"You've been partially authenticated, you still have to use another method."<<std::endl;
+    return false;
+  }
+  case SSH_OK:
+    return true;
+  case SSH_EOF:
+    std::cerr<<"key doesn't exist."<<std::endl;
+    return false;
+  default:
+    return false;
+  }
+  return true;
+}
+namespace CGAL{
+namespace ssh_internal{
+
+bool establish_ssh_session(ssh_session &session,
+                           const char* user,
+                           const char* server,
+                           const char* pub_key_path,
+                           const char* priv_key_path,
+                           const char* priv_key_password)
+{
+  int port = 22;
+
+  //Can use SSH_LOG_PROTOCOL here for verbose output
+  int verbosity = SSH_LOG_NOLOG;
+  int res;
+  //retry 4 times max each time the connection asks to be retried.
+  for(int k = 0; k < 4; ++k)
+  {
+    session = ssh_new();
+    ssh_options_set( session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity );
+    ssh_options_set( session, SSH_OPTIONS_PORT, &port );
+    ssh_options_set( session, SSH_OPTIONS_USER, user );
+    ssh_options_set( session, SSH_OPTIONS_HOST, server);
+    
+    ssh_connect(session);
+#if LIBSSH_VERSION_MAJOR <1 && LIBSSH_VERSION_MINOR < 8
+    if( ssh_is_server_known(session) != SSH_SERVER_KNOWN_OK )
+#else
+      if( ssh_session_is_known_server(session) != SSH_KNOWN_HOSTS_OK )
+#endif
+    {
+      if(QMessageBox::warning(CGAL::Three::Three::mainWindow(), QString("Unknown Server"),
+                              QString ("The server you are trying to join is not known.\n"
+                                       "Do you wish to add it to the known servers list and continue?"),
+                              QMessageBox::Yes | QMessageBox::No) != QMessageBox::Yes)
+      {
+        return false;
+      }
+#if LIBSSH_VERSION_MAJOR <1 && LIBSSH_VERSION_MINOR < 8
+      if( ssh_write_knownhost(session) != SSH_OK )
+#else
+      if( ssh_session_update_known_hosts(session) != SSH_OK )
+#endif
+      {
+        std::cerr << "writeKnownHost failed" << std::endl;
+        return false;
+      }
+      else
+      {
+        ssh_connect(session);
+      }
+    }
+    ssh_key pubkey = ssh_key_new();
+    ssh_pki_import_pubkey_file(pub_key_path, &pubkey);
+    res = ssh_userauth_try_publickey(session, NULL, pubkey);
+    if(res == SSH_AUTH_AGAIN)
+      ssh_disconnect(session);
+    else
+      break;
+  }
+  
+  if(!test_result(res))
+  {
+    ssh_disconnect(session);
+    return false;
+  }
+
+  ssh_key privkey = ssh_key_new();
+  res = ssh_pki_import_privkey_file(priv_key_path, priv_key_password, NULL, NULL, &privkey);
+  if (!test_result(res))
+  {
+    ssh_disconnect(session);
+    return false;
+  }
+  res = ssh_userauth_publickey(session, NULL, privkey);
+  if(!test_result(res))
+  {
+    ssh_disconnect(session);
+    return false;
+  }
+  return true;
+}
+
+void close_connection(ssh_session &session)
+{
+  ssh_disconnect(session);
+}
+
+bool push_file(ssh_session &session,
+               const char* dest_path,
+               const char* filepath)
+{
+  //copy a file
+  ssh_scp scp = ssh_scp_new(
+        session, SSH_SCP_WRITE | SSH_SCP_RECURSIVE, "/tmp");
+  if (scp == NULL)
+  {
+    std::cerr<<"Error allocating scp session: %s\n"
+            << ssh_get_error(session)<<std::endl;
+    return false;
+  }
+  int res = ssh_scp_init(scp);
+  if(res != SSH_OK)
+  {
+    std::cerr<< "Error initializing scp session: %s\n"
+             << ssh_get_error(session)<<std::endl;
+    ssh_scp_free(scp);
+    ssh_disconnect(session);
+    return false;
+  }
+  //read a file into a buffer
+  std::ifstream file(filepath, std::ios::binary | std::ios::ate);
+  if(!file)
+  {
+    std::cerr<<"File not found."<<std::endl;
+    ssh_scp_free(scp);
+    ssh_disconnect(session);
+    return false;
+  }
+  std::streamsize size = file.tellg();
+  file.seekg(0, std::ios::beg);
+
+  std::vector<char> buffer(size);
+  if (!file.read(buffer.data(), size))
+  {
+    std::cerr<<"error while reading file."<<std::endl;
+    ssh_disconnect(session);
+    return false;
+  }
+  //push a file to /tmp
+  res = ssh_scp_push_directory(scp, ".", 0707);
+  if (res != SSH_OK)
+  {
+    std::cerr<<"Can't create remote directory: %s\n"
+            <<ssh_get_error(session)<<std::endl;
+    ssh_disconnect(session);
+    return false;
+  }
+  res = ssh_scp_push_file
+      (scp, dest_path, size, 0707);
+  if (res != SSH_OK)
+  {
+    std::cerr<< "Can't open remote file: %s\n"
+             << ssh_get_error(session)<<std::endl;
+    ssh_disconnect(session);
+    return false;
+  }
+  res = ssh_scp_write(scp, buffer.data(), size);
+  //some versions of libssh don't copy everything without this.
+  //This is the case for the official version on Ubuntu 18.04
+  std::chrono::duration<int, std::micro> timespan(size);
+  std::this_thread::sleep_for(timespan);
+  if (res != SSH_OK)
+  {
+    std::cerr<< "Can't write to remote file: %s\n"
+             << ssh_get_error(session)<<std::endl;
+    ssh_disconnect(session);
+    return false;
+  }
+  return true;
+}
+
+bool pull_file(ssh_session &session,
+               const char* from_path,
+               const char* to_path)
+{
+  int rc;
+  std::size_t size;
+  std::size_t processed = 0;
+  std::vector<char> buffer;
+
+  ssh_scp scp = ssh_scp_new(
+        session, SSH_SCP_READ | SSH_SCP_RECURSIVE, from_path);
+  if (scp == NULL)
+  {
+    std::cerr<<"Error allocating scp session: %s\n"
+            << ssh_get_error(session)<<std::endl;
+    return false;
+  }
+  int res = ssh_scp_init(scp);
+  if(res != SSH_OK)
+  {
+    std::cerr<< "Error initializing scp session: %s\n"
+             << ssh_get_error(session)<<std::endl;
+    ssh_scp_free(scp);
+    ssh_disconnect(session);
+    return false;
+  }
+  rc = ssh_scp_pull_request(scp);
+  if (rc != SSH_SCP_REQUEST_NEWFILE)
+  {
+    std::cerr<< "Error receiving information about file: %s\n"
+             << ssh_get_error(session)<<std::endl;
+    ssh_scp_free(scp);
+    ssh_disconnect(session);
+    return false;
+  }
+  size = ssh_scp_request_get_size64(scp);
+  buffer.resize(size);
+  if(ssh_scp_accept_request(scp) != SSH_OK)
+  {
+    std::cerr<< "Could not accept request."<<std::endl;
+    ssh_scp_free(scp);
+    ssh_disconnect(session);
+    return false;
+  }
+
+  do{
+    rc = ssh_scp_read(scp, buffer.data() + processed, size-processed);
+    if (rc == SSH_ERROR)
+    {
+      std::cerr<< "Error receiving file data: %s\n"<< ssh_get_error(session)<<std::endl;
+      //free(buffer);
+      ssh_scp_free(scp);
+      ssh_disconnect(session);
+      return false;
+    }
+    else
+      processed += rc;
+  }while(processed != size);
+  std::ofstream file(to_path, std::ios::binary |std::ios::trunc);
+  if(!file.write(buffer.data(), size))
+  {
+    std::cerr<<"Error while writing file."<<std::endl;
+  }
+  file.close();
+  ssh_scp_free(scp);
+  return true;
+}
+
+}}
+#endif
diff --git a/Polyhedron/demo/Polyhedron/Viewer.cpp b/Polyhedron/demo/Polyhedron/Viewer.cpp
index bfb1a2331ad..ec6f374323c 100644
--- a/Polyhedron/demo/Polyhedron/Viewer.cpp
+++ b/Polyhedron/demo/Polyhedron/Viewer.cpp
@@ -16,6 +16,11 @@
 #include <QApplication>
 #include <QOpenGLDebugLogger>
 #include <QStyleFactory>
+#include <QAction>
+#include <QRegularExpressionMatch>
+#ifdef CGAL_USE_WEBSOCKETS
+#include <QtWebSockets/QWebSocket>
+#endif
 
 #include <CGAL/Three/Three.h>
 
@@ -40,6 +45,7 @@ public:
   bool inDrawWithNames;
   bool clipping;
   bool projection_is_ortho;
+  bool cam_sharing;
   GLfloat gl_point_size;
   QVector4D clipbox[6];
   QPainter *painter;
@@ -111,6 +117,12 @@ public:
   {
     return shader_programs;
   }
+#ifdef CGAL_USE_WEBSOCKETS
+  QWebSocket m_webSocket;
+#endif
+  bool is_connected;
+  QString session;
+  QUrl m_url;
 };
 
 class LightingDialog :
@@ -268,6 +280,7 @@ void Viewer::doBindings()
   d->spec_power = viewer_settings.value("spec_power", 51.8).toFloat();
   d->scene = 0;
   d->projection_is_ortho = false;
+  d->cam_sharing = false;
   d->twosides = false;
   this->setProperty("draw_two_sides", false);
   this->setProperty("back_front_shading", false);
@@ -278,6 +291,7 @@ void Viewer::doBindings()
   d->shader_programs.resize(NB_OF_PROGRAMS);
   d->textRenderer = new TextRenderer();
   d->is_2d_selection_mode = false;
+  d->is_connected = false;
   
   connect( d->textRenderer, SIGNAL(sendMessage(QString,int)),
            this, SLOT(printMessage(QString,int)) );
@@ -623,7 +637,7 @@ void Viewer::mousePressEvent(QMouseEvent* event)
       d->showDistance(event->pos());
       event->accept();
   }
-  else {
+  else{
     makeCurrent();
     CGAL::QGLViewer::mousePressEvent(event);
   }
@@ -1931,6 +1945,79 @@ bool Viewer::isClipping() const
 {
   return d->clipping;
 }
+#ifdef CGAL_USE_WEBSOCKETS
+void Viewer::setShareCam(bool b, QString session)
+{
+  static bool init = false;
+  if(b)
+  {
+    d->cam_sharing = b;
+    d->session = session;
+    QString ws_url
+        = CGAL::Three::Three::mainWindow()->property("ws_url").toString();
+    if(ws_url.isEmpty())
+    {
+      QMessageBox::warning(this, "Error", "No Server configured. Please go to Edit->Preferences->Network Settings and fill the \"Camera Synchronization Server\" Field.");
+    }
+    else{
+      if(!init)
+      {
+        connect(&d->m_webSocket, &QWebSocket::connected, this, &Viewer::onSocketConnected);
+        connect(&d->m_webSocket, &QWebSocket::disconnected, this,[this]()
+        {
+          d->is_connected = false;
+          Viewer::socketClosed();
+        });
+        init = true;
+      }
+      d->m_webSocket.open(QUrl(ws_url));
+      QApplication::setOverrideCursor(Qt::WaitCursor);
+      QTimer::singleShot(1000, this, [this](){
+        QApplication::restoreOverrideCursor();
+        if(!d->is_connected){
+          QMessageBox::warning(CGAL::Three::Three::mainWindow(),
+                               "Connection failure",
+                               "The requested server was not found.");
+          setShareCam(false, "");
+        }
+      });
+    }
+  }
+  else
+  {
+    QAction* action = findChild<QAction*>("actionShareCamera");
+    action->setChecked(false);
+    d->m_webSocket.close();
+  }
+}
 
+void Viewer::onSocketConnected()
+{
+  connect(&d->m_webSocket, &QWebSocket::textMessageReceived,
+          this, &Viewer::onTextMessageSocketReceived);
+  connect(camera()->frame(), &CGAL::qglviewer::ManipulatedCameraFrame::manipulated,
+          this, [this](){
+    if(d->cam_sharing){
+      QString cam_state = QString("[%1] %2").arg(d->session).arg(dumpCameraCoordinates());
+      //send to server
+      d->m_webSocket.sendTextMessage(cam_state);
+    }
+  });
+  d->is_connected = true;
+}
+
+void Viewer::onTextMessageSocketReceived(QString message)
+{
+  QString session;
+  QString position;
+  QRegularExpression re("\\[(.*)\\] (.*)");
+  QRegularExpressionMatch match = re.match(message);
+  session = match.captured(1);
+  position = match.captured(2);
+  if(session != d->session){
+    return;
+  }
+  moveCameraToCoordinates(position, 0.05f);
+}
+#endif
 #include "Viewer.moc"
-
diff --git a/Polyhedron/demo/Polyhedron/Viewer.h b/Polyhedron/demo/Polyhedron/Viewer.h
index 600b9a6f041..f4fdf522abe 100644
--- a/Polyhedron/demo/Polyhedron/Viewer.h
+++ b/Polyhedron/demo/Polyhedron/Viewer.h
@@ -95,6 +95,7 @@ public:
 Q_SIGNALS:
   void sendMessage(QString);
   void doneInitGL(CGAL::Three::Viewer_interface*);
+  void socketClosed();
 public Q_SLOTS:
   //! Sets the antialiasing to true or false.
   void setAntiAliasing(bool b) Q_DECL_OVERRIDE;
@@ -131,6 +132,11 @@ public Q_SLOTS:
   void setBackFrontColors();
 
   void messageLogged(QOpenGLDebugMessage);
+#ifdef CGAL_USE_WEBSOCKETS
+  void setShareCam(bool, QString);
+  void onSocketConnected();
+  void onTextMessageSocketReceived(QString message);
+#endif
 
 protected:
   void paintEvent(QPaintEvent *)Q_DECL_OVERRIDE;
diff --git a/Polyhedron/demo/Polyhedron/include/CGAL/Use_ssh.h b/Polyhedron/demo/Polyhedron/include/CGAL/Use_ssh.h
new file mode 100644
index 00000000000..2cdca27452b
--- /dev/null
+++ b/Polyhedron/demo/Polyhedron/include/CGAL/Use_ssh.h
@@ -0,0 +1,25 @@
+#ifndef USE_SSH_H
+#define USE_SSH_H
+#include <libssh/libsshpp.hpp>
+namespace CGAL{
+namespace ssh_internal{
+//should be used inside a try/catch(ssh::SshException e)
+
+//give an unitialized session.
+bool establish_ssh_session(ssh_session& session,
+                           const char *user,
+                           const char *server,
+                           const char *pub_key_path,
+                           const char *priv_key_path,
+                           const char *priv_key_password);
+void close_connection(ssh_session& session);
+
+bool push_file(ssh_session& session,
+               const char* dest_path,
+               const char* filepath);
+bool pull_file(ssh_session &session,
+               const char *from_path,
+               const char *to_path);
+
+}}
+#endif
diff --git a/Stream_support/include/CGAL/IO/read_3mf.h b/Stream_support/include/CGAL/IO/read_3mf.h
index 8be3a8c1446..7a6def1f2fe 100644
--- a/Stream_support/include/CGAL/IO/read_3mf.h
+++ b/Stream_support/include/CGAL/IO/read_3mf.h
@@ -65,12 +65,6 @@ bool extract_soups (NMR::PLib3MFModelMeshObject *pMeshObject,
     pBuffer.resize(nNeededChars + 1);
     hResult = NMR::lib3mf_object_getnameutf8(pMeshObject, &pBuffer[0], nNeededChars + 1, NULL);
     pBuffer[nNeededChars] = 0;
-    std::string temp(&pBuffer[0]);
-    if(temp.find("_cgal_pc") != std::string::npos
-       || temp.find("_cgal_pl")!= std::string::npos) //ignore point clouds and polylines
-    {
-      return false;
-    }
     name = std::string(&pBuffer[0]);
   }
   else
@@ -120,151 +114,6 @@ bool extract_soups (NMR::PLib3MFModelMeshObject *pMeshObject,
   return true;
 }
 
-template<typename PointRange,
-         typename PolygonRange,
-         typename ColorRange>
-bool extract_polylines (NMR::PLib3MFModelMeshObject *pMeshObject,
-                        const NMR::MODELTRANSFORM& ,
-                        PointRange& points,
-                        PolygonRange&,
-                        ColorRange& colors,
-                        std::string& name) {
-  typedef typename PointRange::value_type Point_3;
-
-  HRESULT hResult;
-  DWORD nNeededChars;
-  std::vector<char> pBuffer;
-  // Retrieve Mesh Name Length
-  hResult = NMR::lib3mf_object_getnameutf8(pMeshObject, NULL, 0, &nNeededChars);
-  if (hResult != LIB3MF_OK)
-  {
-    points.resize(0);
-    std::cerr<<"Error during name extraction.";
-    return false;
-  }
-
-  // Retrieve Mesh Name
-  if (nNeededChars > 0) {
-    pBuffer.resize(nNeededChars + 1);
-    hResult = NMR::lib3mf_object_getnameutf8(pMeshObject, &pBuffer[0], nNeededChars + 1, NULL);
-    pBuffer[nNeededChars] = 0;
-    std::string temp(&pBuffer[0]);
-    if(temp.find("_cgal_pl")== std::string::npos) //ignore not polylines
-    {
-      points.resize(0);
-      return false;
-    }
-    name = std::string(&pBuffer[0]);
-  }
-  else
-  {
-    points.resize(0);
-    return false;
-  }
-
-  NMR::PLib3MFPropertyHandler * pPropertyHandler;
-  hResult = NMR::lib3mf_meshobject_createpropertyhandler(pMeshObject, &pPropertyHandler);
-  if (hResult != LIB3MF_OK) {
-    DWORD nErrorMessage;
-    LPCSTR pszErrorMessage;
-    std::cerr << "could not create property handler: " << std::hex << hResult << std::endl;
-    NMR::lib3mf_getlasterror(pMeshObject, &nErrorMessage, &pszErrorMessage);
-    std::cerr << "error #" << std::hex << nErrorMessage << ": " << pszErrorMessage << std::endl;
-    NMR::lib3mf_release(pMeshObject);
-    return false;
-  }
-
-  points.resize(points.size()-3);//ignore dummy_vertices
-  for(DWORD vid = 0; vid < points.size(); ++vid)
-  {
-    NMR::MODELMESHVERTEX pVertex;
-    NMR::lib3mf_meshobject_getvertex(pMeshObject, vid+3, &pVertex);
-    points[vid] =
-        Point_3(pVertex.m_fPosition[0],
-        pVertex.m_fPosition[1],
-        pVertex.m_fPosition[2]);
-  }
-
-  NMR::MODELMESH_TRIANGLECOLOR_SRGB pColor;
-  NMR::lib3mf_propertyhandler_getcolor(pPropertyHandler, 0, &pColor);//get color of the dummy triangle
-  NMR::MODELMESHCOLOR_SRGB mColor = pColor.m_Colors[0];
-  colors[0]=CGAL::Color(mColor.m_Red, mColor.m_Green,
-                        mColor.m_Blue, mColor.m_Alpha);
-  return true;
-}
-
-template<typename PointRange,
-         typename PolygonRange,
-         typename ColorRange>
-bool extract_point_clouds (NMR::PLib3MFModelMeshObject *pMeshObject,
-                           const NMR::MODELTRANSFORM&,
-                           PointRange& points,
-                           PolygonRange&,
-                           ColorRange& colors,
-                           std::string& name) {
-  typedef typename PointRange::value_type Point_3;
-
-  HRESULT hResult;
-  DWORD nNeededChars;
-  std::vector<char> pBuffer;
-  // Retrieve Mesh Name Length
-  hResult = NMR::lib3mf_object_getnameutf8(pMeshObject, NULL, 0, &nNeededChars);
-  if (hResult != LIB3MF_OK)
-  {
-    std::cerr<<"Error during name extraction.";
-    points.resize(0);
-    return false;
-  }
-
-  // Retrieve Mesh Name
-  if (nNeededChars > 0) {
-    pBuffer.resize(nNeededChars + 1);
-    hResult = NMR::lib3mf_object_getnameutf8(pMeshObject, &pBuffer[0], nNeededChars + 1, NULL);
-    pBuffer[nNeededChars] = 0;
-    std::string temp(&pBuffer[0]);
-    if(temp.find("_cgal_pc")== std::string::npos) //ignore not point_cloud
-    {
-      points.resize(0);
-      return false;
-    }
-    name = std::string(&pBuffer[0]);
-  }
-  else{
-    points.resize(0);
-    return false;
-  }
-
-  NMR::PLib3MFPropertyHandler * pPropertyHandler;
-  hResult = NMR::lib3mf_meshobject_createpropertyhandler(pMeshObject, &pPropertyHandler);
-  if (hResult != LIB3MF_OK) {
-    DWORD nErrorMessage;
-    LPCSTR pszErrorMessage;
-    std::cerr << "could not create property handler: " << std::hex << hResult << std::endl;
-    NMR::lib3mf_getlasterror(pMeshObject, &nErrorMessage, &pszErrorMessage);
-    std::cerr << "error #" << std::hex << nErrorMessage << ": " << pszErrorMessage << std::endl;
-    NMR::lib3mf_release(pMeshObject);
-    return -1;
-  }
-
-  points.resize(points.size()-3);//ignore dummy_vertices
-  for(DWORD vid = 0; vid < points.size(); ++vid)
-  {
-    NMR::MODELMESHVERTEX pVertex;
-    NMR::lib3mf_meshobject_getvertex(pMeshObject, vid+3, &pVertex);
-    points[vid] =
-        Point_3(pVertex.m_fPosition[0],
-        pVertex.m_fPosition[1],
-        pVertex.m_fPosition[2]);
-  }
-
-  NMR::MODELMESH_TRIANGLECOLOR_SRGB pColor;
-  NMR::lib3mf_propertyhandler_getcolor(pPropertyHandler, 0, &pColor);//get color of the dummy triangle
-  NMR::MODELMESHCOLOR_SRGB mColor = pColor.m_Colors[0];
-  colors[0]=CGAL::Color(mColor.m_Red, mColor.m_Green,
-                        mColor.m_Blue, mColor.m_Alpha);
-  return true;
-}
-
 
 template<typename PointRanges, typename PolygonRanges, typename ColorRanges,
          typename PointRange, typename PolygonRange, typename ColorRange>
@@ -607,43 +456,6 @@ int read_triangle_soups_from_3mf(const std::string& file_name, PointRanges& all_
        all_colors, names, extract_soups<PointRange, PolygonRange, ColorRange>);
 }
 
-
-template<typename PointRanges, typename ColorRanges>
-int read_polylines_from_3mf(const std::string& file_name,
-                            PointRanges& all_points,
-                            ColorRanges& all_colors,
-                            std::vector<std::string>& names
-                            )
-{
-  typedef typename PointRanges::value_type PointRange;
-  typedef std::vector<std::size_t> Polygon;
-  typedef std::vector<Polygon> PolygonRange;
-  typedef std::vector<CGAL::Color> ColorRange;
-  std::vector<PolygonRange> all_polygons;
-  return read_from_3mf<PointRanges,std::vector<PolygonRange>,
-      std::vector<ColorRange>, PointRange, PolygonRange, ColorRange>
-      (file_name, all_points, all_polygons, all_colors, names,
-       extract_polylines<PointRange, PolygonRange, ColorRange>);
-}
-
-
-template<typename PointRanges, typename ColorRanges>
-int read_point_clouds_from_3mf(const std::string& file_name,
-                               PointRanges& all_points,
-                               ColorRanges& all_colors,
-                               std::vector<std::string>& names
-                               )
-{
-  typedef typename PointRanges::value_type PointRange;
-  typedef std::vector<std::size_t> Polygon;
-  typedef std::vector<Polygon> PolygonRange;
-  typedef std::vector<CGAL::Color> ColorRange;
-  std::vector<PolygonRange> all_polygons;
-  return read_from_3mf<PointRanges,std::vector<PolygonRange>,
-      std::vector<ColorRange>, PointRange, PolygonRange, ColorRange>
-      (file_name, all_points, all_polygons, all_colors, names,
-       extract_point_clouds<PointRange, PolygonRange, ColorRange>);
-}
 }//end CGAL
 
 #endif // CGAL_IO_READ_3MF_H
diff --git a/Stream_support/test/Stream_support/test_3mf_to_sm.cpp b/Stream_support/test/Stream_support/test_3mf_to_sm.cpp
index 654cae33bb0..4f4e94feb7e 100644
--- a/Stream_support/test/Stream_support/test_3mf_to_sm.cpp
+++ b/Stream_support/test/Stream_support/test_3mf_to_sm.cpp
@@ -51,33 +51,6 @@ int main(int argc, char** argv)
     ofs << mesh;
     ofs.close();
   }
-  int nb_polylines =
-      CGAL::read_polylines_from_3mf(file_name, all_points, all_colors, names);
-
-  if(nb_polylines == 0)
-    std::cout<<"No polyline found."<<std::endl;
-  else
-  {
-    std::cout<<nb_polylines<<" polylines found, of ";
-    for(int i = 0; i< nb_polylines-1; ++i){
-      std::cout<<all_points[i].size()<<", ";
-    }
-    std::cout<<all_points.back().size()<<" points."<<std::endl;
-  }
-  all_points.clear();
-  all_colors.clear();
-  int nb_point_sets =
-      CGAL::read_point_clouds_from_3mf(file_name, all_points, all_colors, names);
-  if(nb_point_sets == 0)
-    std::cout<<"No point cloud found."<<std::endl;
-  else
-  {
-    std::cout<<nb_point_sets<<" point clouds found, of ";
-    for(int i = 0; i< nb_point_sets-1; ++i){
-      std::cout<<all_points[i].size()<<", ";
-    }
-    std::cout<<all_points.back().size()<<" points."<<std::endl;
-  }
 
   // testing writing functions
   Mesh sphere, tube;
@@ -147,31 +120,6 @@ int main(int argc, char** argv)
   meshes[1] = tube;
   CGAL::write_triangle_meshes_to_3mf("meshes.3mf", meshes, names);
 
-
-  //testing of point clouds
-
-  HRESULT hResult;
-  NMR::PLib3MFModel * pModel;
-  hResult = NMR::lib3mf_createmodel(&pModel);
-  NMR::PLib3MFModelMeshObject* pMeshObject;
-  if (hResult != LIB3MF_OK) {
-    std::cout << "could not create model: " << std::hex << hResult << std::endl;
-    return 1;
-  }
-  for(std::size_t i=0; i< names.size(); ++i)
-  {
-    CGAL::write_mesh_to_model(all_points[i], all_polygons[i],
-                              all_colors[i], names[i], &pMeshObject, pModel);
-  }
-  CGAL::Color color(255,0,0);
-  CGAL::write_point_cloud_to_model(all_points.front(),
-                                   color, names.front(), &pMeshObject, pModel);
-  CGAL::export_model_to_file("micro.3mf", pModel);
-  //testing of polylines
-  CGAL::write_polyline_to_model(all_points.back(),
-                                color, names.back(), &pMeshObject, pModel);
-  CGAL::export_model_to_file("micro.3mf", pModel);
-
   std::cout<<"OK."<<std::endl;
   return 0;
 }