diff --git a/.clang-tidy b/.clang-tidy
index b7f07abf900..6d45e7c27b6 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -1,5 +1,5 @@
 ---
-Checks:          '-clang-diagnostic*,-clang-analyzer*,modernize-use-nullptr'
+Checks:          '-clang-diagnostic*,-clang-analyzer*,google-readability-casting'
 HeaderFilterRegex: 'CGAL/*'
 ...
 
diff --git a/Polyhedron/demo/Polyhedron/Color_map.h b/Polyhedron/demo/Polyhedron/Color_map.h
index 2e04a3ee5bd..a55f0c658d2 100644
--- a/Polyhedron/demo/Polyhedron/Color_map.h
+++ b/Polyhedron/demo/Polyhedron/Color_map.h
@@ -20,7 +20,7 @@ compute_color_map(QColor base_color,
                   Output_color_iterator out)
 {
   qreal hue = base_color.hueF();
-  const qreal step = ((qreal)1) / nb_of_colors;
+  const qreal step = (static_cast<qreal>(1)) / nb_of_colors;
 
   qreal h = hue==-1 ? 0
                     :hue;
diff --git a/Polyhedron/demo/Polyhedron/Edge_container.cpp b/Polyhedron/demo/Polyhedron/Edge_container.cpp
index 09a2b47d258..50584f8e94f 100644
--- a/Polyhedron/demo/Polyhedron/Edge_container.cpp
+++ b/Polyhedron/demo/Polyhedron/Edge_container.cpp
@@ -167,8 +167,8 @@ void Edge_container::draw(Viewer_interface *viewer,
     if(getVao(viewer)->program->property("hasViewport").toBool())
     {
       getVao(viewer)->program->setUniformValue("viewport", getViewport());
-      getVao(viewer)->program->setUniformValue("near",(GLfloat)viewer->camera()->zNear());
-      getVao(viewer)->program->setUniformValue("far",(GLfloat)viewer->camera()->zFar());
+      getVao(viewer)->program->setUniformValue("near",static_cast<GLfloat>(viewer->camera()->zNear()));
+      getVao(viewer)->program->setUniformValue("far",static_cast<GLfloat>(viewer->camera()->zFar()));
     }
     if(getVao(viewer)->program->property("hasWidth").toBool())
       getVao(viewer)->program->setUniformValue("width", getWidth());
diff --git a/Polyhedron/demo/Polyhedron/MainWindow.cpp b/Polyhedron/demo/Polyhedron/MainWindow.cpp
index eea2797cbca..71d8f173487 100644
--- a/Polyhedron/demo/Polyhedron/MainWindow.cpp
+++ b/Polyhedron/demo/Polyhedron/MainWindow.cpp
@@ -2494,15 +2494,15 @@ void MainWindow::viewerShowObject()
   Scene_item* item = nullptr;
   QAction* sender_action = qobject_cast<QAction*>(sender());
   if(sender_action && !sender_action->data().isNull()) {
-    item = (Scene_item*)sender_action->data().value<void*>();
+    item = static_cast<Scene_item*>(sender_action->data().value<void*>());
   }
   if(item) {
     const Scene::Bbox bbox = item->bbox();
-    CGAL::qglviewer::Vec min((float)bbox.xmin()+viewer->offset().x, (float)bbox.ymin()+viewer->offset().y, (float)bbox.zmin()+viewer->offset().z),
-        max((float)bbox.xmax()+viewer->offset().x, (float)bbox.ymax()+viewer->offset().y, (float)bbox.zmax()+viewer->offset().z);
+    CGAL::qglviewer::Vec min(static_cast<float>(bbox.xmin())+viewer->offset().x, static_cast<float>(bbox.ymin())+viewer->offset().y, static_cast<float>(bbox.zmin())+viewer->offset().z),
+        max(static_cast<float>(bbox.xmax())+viewer->offset().x, static_cast<float>(bbox.ymax())+viewer->offset().y, static_cast<float>(bbox.zmax())+viewer->offset().z);
     viewer->setSceneBoundingBox(min, max);
-    viewerShow((float)min.x, (float)min.y, (float)min.z,
-               (float)max.x, (float)max.y, (float)max.z);
+    viewerShow(static_cast<float>(min.x), static_cast<float>(min.y), static_cast<float>(min.z),
+               static_cast<float>(max.x), static_cast<float>(max.y), static_cast<float>(max.z));
   }
 }
 /* to check
@@ -3598,9 +3598,9 @@ void SubViewer::lookat()
     if (viewer->camera()->frame()->isSpinning())
       viewer->camera()->frame()->stopSpinning();
     mw->viewerShow(viewer,
-                   (float)dialog.get_x() + viewer->offset().x,
-                   (float)dialog.get_y() + viewer->offset().y,
-                   (float)dialog.get_z() + viewer->offset().z);
+                   static_cast<float>(dialog.get_x()) + viewer->offset().x,
+                   static_cast<float>(dialog.get_y()) + viewer->offset().y,
+                   static_cast<float>(dialog.get_z()) + viewer->offset().z);
   }
 }
 
diff --git a/Polyhedron/demo/Polyhedron/Plugins/PMP/Scene_facegraph_item_k_ring_selection.h b/Polyhedron/demo/Polyhedron/Plugins/PMP/Scene_facegraph_item_k_ring_selection.h
index 7432244e8e9..361c4a0d7d3 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/PMP/Scene_facegraph_item_k_ring_selection.h
+++ b/Polyhedron/demo/Polyhedron/Plugins/PMP/Scene_facegraph_item_k_ring_selection.h
@@ -302,7 +302,7 @@ public Q_SLOTS:
       }
       if(total == 0)
         continue;
-      CGAL::qglviewer::Vec center(x/(double)total, y/(double)total, z/(double)total);
+      CGAL::qglviewer::Vec center(x/static_cast<double>(total), y/static_cast<double>(total), z/static_cast<double>(total));
       CGAL::qglviewer::Vec orig;
       CGAL::qglviewer::Vec dir;
       if(camera->type() == CGAL::qglviewer::Camera::PERSPECTIVE)
diff --git a/Polyhedron/demo/Polyhedron/Scene.cpp b/Polyhedron/demo/Polyhedron/Scene.cpp
index 484369f361b..dc74841faf4 100644
--- a/Polyhedron/demo/Polyhedron/Scene.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene.cpp
@@ -764,8 +764,8 @@ Scene::draw_aux(bool with_names, CGAL::Three::Viewer_interface* viewer)
       std::vector<QOpenGLFramebufferObject*> fbos;
       std::vector<QOpenGLFramebufferObject*> depth_test;
       QColor background = viewer->backgroundColor();
-      fbos.resize((int)viewer->total_pass());
-      depth_test.resize((int)viewer->total_pass()-1);
+      fbos.resize(static_cast<int>(viewer->total_pass()));
+      depth_test.resize(static_cast<int>(viewer->total_pass())-1);
 
       //first pass
       fbos[0] = new QOpenGLFramebufferObject(viewer->width(), viewer->height(),QOpenGLFramebufferObject::Depth, GL_TEXTURE_2D, GL_RGBA32F);
@@ -835,8 +835,8 @@ Scene::draw_aux(bool with_names, CGAL::Three::Viewer_interface* viewer)
 
 
       //last pass
-      fbos[(int)viewer->total_pass()-1] = new QOpenGLFramebufferObject(viewer->width(), viewer->height(),QOpenGLFramebufferObject::Depth, GL_TEXTURE_2D, GL_RGBA32F);
-      fbos[(int)viewer->total_pass()-1]->bind();
+      fbos[static_cast<int>(viewer->total_pass())-1] = new QOpenGLFramebufferObject(viewer->width(), viewer->height(),QOpenGLFramebufferObject::Depth, GL_TEXTURE_2D, GL_RGBA32F);
+      fbos[static_cast<int>(viewer->total_pass())-1]->bind();
       viewer->glDisable(GL_BLEND);
       viewer->glEnable(GL_DEPTH_TEST);
       viewer->glDepthFunc(GL_LESS);
@@ -846,18 +846,18 @@ Scene::draw_aux(bool with_names, CGAL::Three::Viewer_interface* viewer)
                            0.0f);
       viewer->glClearDepthf(1);
       viewer->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-      renderScene(opaque_items     , viewer, picked_item_IDs, false, (int)viewer->total_pass()-1, false, depth_test[(int)viewer->total_pass()-2]);
-      renderScene(transparent_items, viewer, picked_item_IDs, false, (int)viewer->total_pass()-1, false, depth_test[(int)viewer->total_pass()-2]);
-      fbos[(int)viewer->total_pass()-1]->release();
+      renderScene(opaque_items     , viewer, picked_item_IDs, false, static_cast<int>(viewer->total_pass())-1, false, depth_test[static_cast<int>(viewer->total_pass())-2]);
+      renderScene(transparent_items, viewer, picked_item_IDs, false, static_cast<int>(viewer->total_pass())-1, false, depth_test[static_cast<int>(viewer->total_pass())-2]);
+      fbos[static_cast<int>(viewer->total_pass())-1]->release();
       if(viewer->getStoredFrameBuffer() != nullptr)
         viewer->getStoredFrameBuffer()->bind();
 
       //blending
       program.bind();
       vaos[viewer]->bind();
-      viewer->glClearColor((GLclampf)background.redF(),
-                           (GLclampf)background.greenF(),
-                           (GLclampf)background.blueF(),
+      viewer->glClearColor(static_cast<GLclampf>(background.redF()),
+                           static_cast<GLclampf>(background.greenF()),
+                           static_cast<GLclampf>(background.blueF()),
                            0.0f);
       viewer->glDisable(GL_DEPTH_TEST);
       viewer->glClear(GL_COLOR_BUFFER_BIT);
@@ -868,9 +868,9 @@ Scene::draw_aux(bool with_names, CGAL::Three::Viewer_interface* viewer)
       proj_mat.setToIdentity();
       proj_mat.ortho(-1,1,-1,1,0,1);
       program.setUniformValue("projection_matrix", proj_mat);
-      for(int i=0; i< (int)viewer->total_pass()-1; ++i)
+      for(int i=0; i< static_cast<int>(viewer->total_pass())-1; ++i)
         delete depth_test[i];
-      for(int i = (int)viewer->total_pass()-1; i>=0; --i)
+      for(int i = static_cast<int>(viewer->total_pass())-1; i>=0; --i)
       {
         viewer->glBindTexture(GL_TEXTURE_2D, fbos[i]->texture());
         viewer->glDrawArrays(GL_TRIANGLES,0,static_cast<GLsizei>(6));
diff --git a/Polyhedron/demo/Polyhedron/Scene_item_rendering_helper.cpp b/Polyhedron/demo/Polyhedron/Scene_item_rendering_helper.cpp
index 3f36dc6c958..30239fa2be0 100644
--- a/Polyhedron/demo/Polyhedron/Scene_item_rendering_helper.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene_item_rendering_helper.cpp
@@ -88,7 +88,7 @@ float Scene_item_rendering_helper::alpha() const
 {
   if(!priv->alphaSlider)
     return 1.0f;
-  return (float)priv->alphaSlider->value() / 255.0f;
+  return static_cast<float>(priv->alphaSlider->value()) / 255.0f;
 }
 
 void Scene_item_rendering_helper::initGL(CGAL::Three::Viewer_interface* viewer) const
diff --git a/Polyhedron/demo/Polyhedron/Scene_points_with_normal_item.cpp b/Polyhedron/demo/Polyhedron/Scene_points_with_normal_item.cpp
index 63707001765..db4de5ef72d 100644
--- a/Polyhedron/demo/Polyhedron/Scene_points_with_normal_item.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene_points_with_normal_item.cpp
@@ -671,7 +671,7 @@ void Scene_points_with_normal_item::drawEdges(CGAL::Three::Viewer_interface* vie
     double ratio_displayed = 1.0;
     if (viewer->inFastDrawing () &&
         (d->nb_lines/6 > limit_fast_drawing)) // arbitrary large value
-      ratio_displayed = 6 * limit_fast_drawing / (double)(d->nb_lines);
+      ratio_displayed = 6 * limit_fast_drawing / static_cast<double>(d->nb_lines);
     if(!isInit(viewer))
       initGL(viewer);
     if ( getBuffersFilled() &&
@@ -699,7 +699,7 @@ drawPoints(CGAL::Three::Viewer_interface* viewer) const
   double ratio_displayed = 1.0;
   if ((viewer->inFastDrawing () || d->isPointSliderMoving())
       &&((d->nb_points )/3 > limit_fast_drawing)) // arbitrary large value
-    ratio_displayed = 3 * limit_fast_drawing / (double)(d->nb_points);
+    ratio_displayed = 3 * limit_fast_drawing / static_cast<double>(d->nb_points);
 
   if(!isInit(viewer))
     initGL(viewer);
diff --git a/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.cpp b/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.cpp
index 6e106c555eb..3e001d5df45 100644
--- a/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene_polygon_soup_item.cpp
@@ -196,16 +196,16 @@ Scene_polygon_soup_item_priv::triangulate_polygon(Polygons_iterator pit, int pol
           normals.push_back(normal.z());
           if(!soup->fcolors.empty())
           {
-            f_colors.push_back((float)color.red()/255);
-            f_colors.push_back((float)color.green()/255);
-            f_colors.push_back((float)color.blue()/255);
+            f_colors.push_back(static_cast<float>(color.red())/255);
+            f_colors.push_back(static_cast<float>(color.green())/255);
+            f_colors.push_back(static_cast<float>(color.blue())/255);
           }
           if(!soup->vcolors.empty())
           {
             CGAL::IO::Color vcolor = soup->vcolors[triangulation.v2v[ffit->vertex(i)]];
-            v_colors.push_back((float)vcolor.red()/255);
-            v_colors.push_back((float)vcolor.green()/255);
-            v_colors.push_back((float)vcolor.blue()/255);
+            v_colors.push_back(static_cast<float>(vcolor.red())/255);
+            v_colors.push_back(static_cast<float>(vcolor.green())/255);
+            v_colors.push_back(static_cast<float>(vcolor.blue())/255);
           }
         }
     }
@@ -263,17 +263,17 @@ Scene_polygon_soup_item_priv::compute_normals_and_vertices() const{
                 if(!soup->fcolors.empty())
                 {
                   const CGAL::IO::Color color = soup->fcolors[nb];
-                    f_colors.push_back((float)color.red()/255);
-                    f_colors.push_back((float)color.green()/255);
-                    f_colors.push_back((float)color.blue()/255);
+                    f_colors.push_back(static_cast<float>(color.red())/255);
+                    f_colors.push_back(static_cast<float>(color.green())/255);
+                    f_colors.push_back(static_cast<float>(color.blue())/255);
                 }
 
                 if(!soup->vcolors.empty())
                 {
                   const CGAL::IO::Color color = soup->vcolors[it->at(i)];
-                  v_colors.push_back((float)color.red()/255);
-                  v_colors.push_back((float)color.green()/255);
-                  v_colors.push_back((float)color.blue()/255);
+                  v_colors.push_back(static_cast<float>(color.red())/255);
+                  v_colors.push_back(static_cast<float>(color.green())/255);
+                  v_colors.push_back(static_cast<float>(color.blue())/255);
                 }
             }
         }
diff --git a/Polyhedron/demo/Polyhedron/Scene_surface_mesh_item.cpp b/Polyhedron/demo/Polyhedron/Scene_surface_mesh_item.cpp
index d24357f2f1c..61fd8b370ac 100644
--- a/Polyhedron/demo/Polyhedron/Scene_surface_mesh_item.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene_surface_mesh_item.cpp
@@ -389,21 +389,21 @@ void Scene_surface_mesh_item_priv::addFlatData(Point p, EPICK::Vector_3 n, CGAL:
   const CGAL::qglviewer::Vec offset = static_cast<CGAL::Three::Viewer_interface*>(CGAL::QGLViewer::QGLViewerPool().first())->offset();
   if(name.testFlag(Scene_item_rendering_helper::GEOMETRY))
   {
-    flat_vertices.push_back((cgal_gl_data)(p.x()+offset[0]));
-    flat_vertices.push_back((cgal_gl_data)(p.y()+offset[1]));
-    flat_vertices.push_back((cgal_gl_data)(p.z()+offset[2]));
+    flat_vertices.push_back(static_cast<cgal_gl_data>(p.x()+offset[0]));
+    flat_vertices.push_back(static_cast<cgal_gl_data>(p.y()+offset[1]));
+    flat_vertices.push_back(static_cast<cgal_gl_data>(p.z()+offset[2]));
   }
   if(name.testFlag(Scene_item_rendering_helper::NORMALS))
   {
-    flat_normals.push_back((cgal_gl_data)n.x());
-    flat_normals.push_back((cgal_gl_data)n.y());
-    flat_normals.push_back((cgal_gl_data)n.z());
+    flat_normals.push_back(static_cast<cgal_gl_data>(n.x()));
+    flat_normals.push_back(static_cast<cgal_gl_data>(n.y()));
+    flat_normals.push_back(static_cast<cgal_gl_data>(n.z()));
   }
   if(c != nullptr && name.testFlag(Scene_item_rendering_helper::COLORS))
   {
-    f_colors.push_back((float)c->red()/255);
-    f_colors.push_back((float)c->green()/255);
-    f_colors.push_back((float)c->blue()/255);
+    f_colors.push_back(static_cast<float>(c->red())/255);
+    f_colors.push_back(static_cast<float>(c->green())/255);
+    f_colors.push_back(static_cast<float>(c->blue())/255);
   }
 }
 
@@ -649,9 +649,9 @@ void Scene_surface_mesh_item_priv::compute_elements(Scene_item_rendering_helper:
     for(vertex_descriptor vd : vertices(*smesh_))
     {
       CGAL::IO::Color c = vcolors[vd];
-      v_colors.push_back((float)c.red()/255);
-      v_colors.push_back((float)c.green()/255);
-      v_colors.push_back((float)c.blue()/255);
+      v_colors.push_back(static_cast<float>(c.red())/255);
+      v_colors.push_back(static_cast<float>(c.green())/255);
+      v_colors.push_back(static_cast<float>(c.blue())/255);
     }
   }
 
@@ -1566,8 +1566,8 @@ void
 Scene_surface_mesh_item_priv::
 invalidate_stats()
 {
-  number_of_degenerated_faces = (unsigned int)(-1);
-  number_of_null_length_edges = (unsigned int)(-1);
+  number_of_degenerated_faces = static_cast<unsigned int>(-1);
+  number_of_null_length_edges = static_cast<unsigned int>(-1);
   has_nm_vertices = false;
   volume = -std::numeric_limits<double>::infinity();
   area = -std::numeric_limits<double>::infinity();
@@ -1675,7 +1675,7 @@ QString Scene_surface_mesh_item::computeStats(int type)
   {
     if(is_triangle_mesh(*d->smesh_))
     {
-      if (d->number_of_degenerated_faces == (unsigned int)(-1))
+      if (d->number_of_degenerated_faces == static_cast<unsigned int>(-1))
         d->number_of_degenerated_faces = nb_degenerate_faces(d->smesh_);
       return QString::number(d->number_of_degenerated_faces);
     }
@@ -2333,7 +2333,7 @@ float Scene_surface_mesh_item::alpha() const
 {
   if(!d->alphaSlider)
     return 1.0f;
-  return (float)d->alphaSlider->value() / 255.0f;
+  return static_cast<float>(d->alphaSlider->value()) / 255.0f;
 }
 
 void Scene_surface_mesh_item::setAlpha(int alpha)
diff --git a/Polyhedron/demo/Polyhedron/Triangle_container.cpp b/Polyhedron/demo/Polyhedron/Triangle_container.cpp
index ae6ee18ae71..3442f948e3a 100644
--- a/Polyhedron/demo/Polyhedron/Triangle_container.cpp
+++ b/Polyhedron/demo/Polyhedron/Triangle_container.cpp
@@ -165,8 +165,8 @@ void Triangle_container::draw(Viewer_interface* viewer,
       getVao(viewer)->program->setUniformValue("comparing", viewer->currentPass() > 0);
       getVao(viewer)->program->setUniformValue("width", viewer->width()*1.0f);
       getVao(viewer)->program->setUniformValue("height", viewer->height()*1.0f);
-      getVao(viewer)->program->setUniformValue("near", (float)viewer->camera()->zNear());
-      getVao(viewer)->program->setUniformValue("far", (float)viewer->camera()->zFar());
+      getVao(viewer)->program->setUniformValue("near", static_cast<float>(viewer->camera()->zNear()));
+      getVao(viewer)->program->setUniformValue("far", static_cast<float>(viewer->camera()->zFar()));
       getVao(viewer)->program->setUniformValue("writing", viewer->isDepthWriting());
       getVao(viewer)->program->setUniformValue("alpha", d->alpha);
       if( fbo)
@@ -205,8 +205,8 @@ void Triangle_container::draw(Viewer_interface* viewer,
       getVao(viewer)->program->setUniformValue("comparing", viewer->currentPass() > 0);
       getVao(viewer)->program->setUniformValue("width", viewer->width()*1.0f);
       getVao(viewer)->program->setUniformValue("height", viewer->height()*1.0f);
-      getVao(viewer)->program->setUniformValue("near", (float)viewer->camera()->zNear());
-      getVao(viewer)->program->setUniformValue("far", (float)viewer->camera()->zFar());
+      getVao(viewer)->program->setUniformValue("near", static_cast<float>(viewer->camera()->zNear()));
+      getVao(viewer)->program->setUniformValue("far", static_cast<float>(viewer->camera()->zFar()));
       getVao(viewer)->program->setUniformValue("writing", viewer->isDepthWriting());
       getVao(viewer)->program->setUniformValue("alpha", d->alpha);
       if( fbo)
diff --git a/Polyhedron/demo/Polyhedron/Viewer.cpp b/Polyhedron/demo/Polyhedron/Viewer.cpp
index 515bda440ba..1d9cbbc2c0c 100644
--- a/Polyhedron/demo/Polyhedron/Viewer.cpp
+++ b/Polyhedron/demo/Polyhedron/Viewer.cpp
@@ -502,7 +502,7 @@ void Viewer::init()
     connect(d->logger, SIGNAL(messageLogged(QOpenGLDebugMessage)), this, SLOT(messageLogged(QOpenGLDebugMessage)));
     d->logger->startLogging();
   }
-  glDrawArraysInstanced = (PFNGLDRAWARRAYSINSTANCEDARBPROC)this->context()->getProcAddress("glDrawArraysInstancedARB");
+  glDrawArraysInstanced = reinterpret_cast<PFNGLDRAWARRAYSINSTANCEDARBPROC>(this->context()->getProcAddress("glDrawArraysInstancedARB"));
   if(!glDrawArraysInstanced)
   {
       qDebug()<<"glDrawArraysInstancedARB : extension not found. Spheres will be displayed as points.";
@@ -511,7 +511,7 @@ void Viewer::init()
   else
       d->extension_is_found = true;
 
-  glVertexAttribDivisor = (PFNGLVERTEXATTRIBDIVISORARBPROC)this->context()->getProcAddress("glVertexAttribDivisorARB");
+  glVertexAttribDivisor = reinterpret_cast<PFNGLVERTEXATTRIBDIVISORARBPROC>(this->context()->getProcAddress("glVertexAttribDivisorARB"));
   if(!glDrawArraysInstanced)
   {
       qDebug()<<"glVertexAttribDivisorARB : extension not found. Spheres will be displayed as points.";
@@ -1092,7 +1092,7 @@ void Viewer::drawVisualHints()
         camera()->getModelViewProjectionMatrix(mat);
         for(int i=0; i < 16; i++)
         {
-          mvpMatrix.data()[i] = (float)mat[i];
+          mvpMatrix.data()[i] = static_cast<float>(mat[i]);
         }
         if(!isOpenGL_4_3())
         {
@@ -1114,8 +1114,8 @@ void Viewer::drawVisualHints()
           program->bind();
           QVector2D vp(width(), height());
           program->setUniformValue("viewport", vp);
-          program->setUniformValue("near",(GLfloat)camera()->zNear());
-          program->setUniformValue("far",(GLfloat)camera()->zFar());
+          program->setUniformValue("near",static_cast<GLfloat>(camera()->zNear()));
+          program->setUniformValue("far",static_cast<GLfloat>(camera()->zFar()));
           program->setUniformValue("width", GLfloat(3.0f));
           program->setAttributeValue("colors", QColor(Qt::black));
           program->setUniformValue("mvp_matrix", mvpMatrix);
@@ -1852,9 +1852,9 @@ void Viewer::setLighting()
   //set ambient
   connect(dialog, &LightingDialog::s_ambient_changed,
           [this, dialog](){
-    d->ambient=QVector4D((float)dialog->ambient.redF(),
-                         (float)dialog->ambient.greenF(),
-                         (float)dialog->ambient.blueF(),
+    d->ambient=QVector4D(static_cast<float>(dialog->ambient.redF()),
+                         static_cast<float>(dialog->ambient.greenF()),
+                         static_cast<float>(dialog->ambient.blueF()),
                          1.0f);
     update();
   });
@@ -1862,18 +1862,18 @@ void Viewer::setLighting()
   //set diffuse
   connect(dialog, &LightingDialog::s_diffuse_changed,
           [this, dialog](){
-    d->diffuse=QVector4D((float)dialog->diffuse.redF(),
-                         (float)dialog->diffuse.greenF(),
-                         (float)dialog->diffuse.blueF(),
+    d->diffuse=QVector4D(static_cast<float>(dialog->diffuse.redF()),
+                         static_cast<float>(dialog->diffuse.greenF()),
+                         static_cast<float>(dialog->diffuse.blueF()),
                          1.0f);
     update();
   });
   //set specular
   connect(dialog, &LightingDialog::s_specular_changed,
           [this, dialog](){
-    d->specular=QVector4D((float)dialog->specular.redF(),
-                          (float)dialog->specular.greenF(),
-                          (float)dialog->specular.blueF(),
+    d->specular=QVector4D(static_cast<float>(dialog->specular.redF()),
+                          static_cast<float>(dialog->specular.greenF()),
+                          static_cast<float>(dialog->specular.blueF()),
                          1.0f);
     update();
 
@@ -2035,8 +2035,8 @@ void Viewer::scaleScene()
   else
     d->scaler = QVector3D(1,1,1);
 
-  CGAL::qglviewer::Vec vmin(((float)bbox.xmin()+offset().x)*d->scaler.x(), ((float)bbox.ymin()+offset().y)*d->scaler.y(), ((float)bbox.zmin()+offset().z)*d->scaler.z()),
-      vmax(((float)bbox.xmax()+offset().x)*d->scaler.x(), ((float)bbox.ymax()+offset().y)*d->scaler.y(), ((float)bbox.zmax()+offset().z)*d->scaler.z());
+  CGAL::qglviewer::Vec vmin((static_cast<float>(bbox.xmin())+offset().x)*d->scaler.x(), (static_cast<float>(bbox.ymin())+offset().y)*d->scaler.y(), (static_cast<float>(bbox.zmin())+offset().z)*d->scaler.z()),
+      vmax((static_cast<float>(bbox.xmax())+offset().x)*d->scaler.x(), (static_cast<float>(bbox.ymax())+offset().y)*d->scaler.y(), (static_cast<float>(bbox.zmax())+offset().z)*d->scaler.z());
   camera()->setPivotPoint((vmin+vmax)*0.5);
   camera()->setSceneBoundingBox(vmin, vmax);
   camera()->fitBoundingBox(vmin, vmax);
@@ -2132,8 +2132,8 @@ void Viewer::showEntireScene()
   CGAL::QGLViewer::showEntireScene();
   CGAL::Bbox_3 bbox = CGAL::Three::Three::scene()->bbox();
 
-  CGAL::qglviewer::Vec vmin(((float)bbox.xmin()+offset().x)*d->scaler.x(), ((float)bbox.ymin()+offset().y)*d->scaler.y(), ((float)bbox.zmin()+offset().z)*d->scaler.z()),
-      vmax(((float)bbox.xmax()+offset().x)*d->scaler.x(), ((float)bbox.ymax()+offset().y)*d->scaler.y(), ((float)bbox.zmax()+offset().z)*d->scaler.z());
+  CGAL::qglviewer::Vec vmin((static_cast<float>(bbox.xmin())+offset().x)*d->scaler.x(), (static_cast<float>(bbox.ymin())+offset().y)*d->scaler.y(), (static_cast<float>(bbox.zmin())+offset().z)*d->scaler.z()),
+      vmax((static_cast<float>(bbox.xmax())+offset().x)*d->scaler.x(), (static_cast<float>(bbox.ymax())+offset().y)*d->scaler.y(), (static_cast<float>(bbox.zmax())+offset().z)*d->scaler.z());
   camera()->setPivotPoint((vmin+vmax)*0.5);
   camera()->setSceneBoundingBox(vmin, vmax);
   camera()->fitBoundingBox(vmin, vmax);
diff --git a/Three/include/CGAL/Three/Scene_item.h b/Three/include/CGAL/Three/Scene_item.h
index 0f170f2186e..6c2c43de591 100644
--- a/Three/include/CGAL/Three/Scene_item.h
+++ b/Three/include/CGAL/Three/Scene_item.h
@@ -331,7 +331,7 @@ public Q_SLOTS:
   //!This function is called by `Scene::changeGroup` and should not be
   //!called manually.
   virtual void moveToGroup(Scene_group_item* group);
-  void setRenderingMode(int m) { setRenderingMode((RenderingMode)m);}
+  void setRenderingMode(int m) { setRenderingMode(static_cast<RenderingMode>(m));}
   //!Sets the rendering mode of the item.
   //!@see RenderingMode
   virtual void setRenderingMode(RenderingMode m) {