diff --git a/Lab/demo/Lab/Scene_item.cpp b/Lab/demo/Lab/Scene_item.cpp
index 104d2af1c10..a7622f25b77 100644
--- a/Lab/demo/Lab/Scene_item.cpp
+++ b/Lab/demo/Lab/Scene_item.cpp
@@ -143,7 +143,12 @@ moveToGroup(CGAL::Three::Scene_group_item* group) {
 
 void CGAL::Three::Scene_item::invalidateOpenGLBuffers() {}
 
-void CGAL::Three::Scene_item::selection_changed(bool) {}
+void CGAL::Three::Scene_item::selection_changed(bool p_is_selected) {
+  if (p_is_selected != is_selected)
+  {
+    is_selected = p_is_selected;
+  }
+}
 void CGAL::Three::Scene_item::setVisible(bool b)
 {
   visible_ = b;
diff --git a/Lab/demo/Lab/Scene_surface_mesh_item.cpp b/Lab/demo/Lab/Scene_surface_mesh_item.cpp
index cf8ed877f77..d484723e55a 100644
--- a/Lab/demo/Lab/Scene_surface_mesh_item.cpp
+++ b/Lab/demo/Lab/Scene_surface_mesh_item.cpp
@@ -734,7 +734,7 @@ void Scene_surface_mesh_item_priv::initialize_colors() const
   if(item->property("recompute_colors").toBool())
   {
     colors_.clear();
-    compute_color_map(item->color(), (std::max)(1, max + 1 - min_patch_id),
+    compute_deterministic_color_map(item->color(), (std::max)(1, max + 1 - min_patch_id),
                       std::back_inserter(colors_));
     qDebug()<<colors_.size()<<" colors in item";
   }
diff --git a/Lab/demo/Lab/Scene_triangulation_3_item.cpp b/Lab/demo/Lab/Scene_triangulation_3_item.cpp
index 6480df09d98..1fdbe92d2cb 100644
--- a/Lab/demo/Lab/Scene_triangulation_3_item.cpp
+++ b/Lab/demo/Lab/Scene_triangulation_3_item.cpp
@@ -1063,6 +1063,7 @@ void Scene_triangulation_3_item::draw(CGAL::Three::Viewer_interface* viewer) con
     // it is only computed once and positions_poly is emptied at the end
     getTriangleContainer(T3_faces)->setAlpha(alpha());
     getTriangleContainer(T3_faces)->setIsSurface(is_surface());
+    getTriangleContainer(T3_faces)->setSelected(is_selected);
     QOpenGLShaderProgram* program = viewer->getShaderProgram(getTriangleContainer(T3_faces)->getProgram());
     program->bind();
     if(d->is_filterable)
diff --git a/Lab/demo/Lab/resources/shader_c3t3.frag b/Lab/demo/Lab/resources/shader_c3t3.frag
index 4f347d310c6..c0daffeb795 100644
--- a/Lab/demo/Lab/resources/shader_c3t3.frag
+++ b/Lab/demo/Lab/resources/shader_c3t3.frag
@@ -98,7 +98,7 @@ void main(void) {
       vec4 specular = pow(max(dot(R,V), 0.0), spec_power) * light_spec; 
       vec4 ret_color = vec4((my_color*light_amb).xyz + diffuse.xyz + specular.xyz,1); 
       if(is_selected)
-          out_color = vec4(ret_color.r+70.0/255.0, ret_color.g+70.0/255.0, ret_color.b+70.0/255.0, alpha);
+          out_color = vec4(ret_color.r+35.0/255.0, ret_color.g+35.0/255.0, ret_color.b+35.0/255.0, alpha);
       else
           out_color = vec4(ret_color.xyz, alpha);
     }