diff --git a/Polyhedron/demo/Polyhedron/Plugins/PCA/Scene_edit_box_item.cpp b/Polyhedron/demo/Polyhedron/Plugins/PCA/Scene_edit_box_item.cpp
index cca910c3776..91bcde149ba 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/PCA/Scene_edit_box_item.cpp
+++ b/Polyhedron/demo/Polyhedron/Plugins/PCA/Scene_edit_box_item.cpp
@@ -99,9 +99,10 @@ struct Scene_edit_box_item_priv{
     constraint.setRotationConstraintDirection(CGAL::qglviewer::Vec(.0,.0,.1));
     frame->setConstraint(&constraint);
     //create the sphere model
-    pool[0] = bb.xmin(); pool[3] = bb.xmax();
-    pool[1] = bb.ymin(); pool[4] = bb.ymax();
-    pool[2] = bb.zmin(); pool[5] = bb.zmax();
+    float eps = 1.e-3;
+    pool[0] = bb.xmin()-eps; pool[3] = bb.xmax()+eps;
+    pool[1] = bb.ymin()-eps; pool[4] = bb.ymax()+eps;
+    pool[2] = bb.zmin()-eps; pool[5] = bb.zmax()+eps;
 
     vertex_spheres.resize(0);
     normal_spheres.resize(0);
@@ -254,7 +255,7 @@ struct Scene_edit_box_item_priv{
   void reset_vertices()
   {
     Scene_item::Bbox bb = scene->bbox();
-    float eps = 1.e-6;
+    float eps = 1.e-3;
     pool[0] = bb.xmin()-eps; pool[3] = bb.xmax()+eps;
     pool[1] = bb.ymin()-eps; pool[4] = bb.ymax()+eps;
     pool[2] = bb.zmin()-eps; pool[5] = bb.zmax()+eps;
diff --git a/Polyhedron/demo/Polyhedron/Scene_triangulation_3_item.cpp b/Polyhedron/demo/Polyhedron/Scene_triangulation_3_item.cpp
index 84f6daae430..7eee6f9c094 100644
--- a/Polyhedron/demo/Polyhedron/Scene_triangulation_3_item.cpp
+++ b/Polyhedron/demo/Polyhedron/Scene_triangulation_3_item.cpp
@@ -3,7 +3,6 @@
 #include "Scene_triangulation_3_item.h"
 #include "Scene_surface_mesh_item.h"
 #include "Scene_spheres_item.h"
-#include "Plugins/PCA/Scene_edit_box_item.h"
 
 #include <QVector>
 #include <QColor>
diff --git a/Polyhedron/demo/Polyhedron/Scene_triangulation_3_item.h b/Polyhedron/demo/Polyhedron/Scene_triangulation_3_item.h
index 33a2cd8f124..89f0e38d3d9 100644
--- a/Polyhedron/demo/Polyhedron/Scene_triangulation_3_item.h
+++ b/Polyhedron/demo/Polyhedron/Scene_triangulation_3_item.h
@@ -2,6 +2,7 @@
 #define SCENE_TRIANGULATION_3_ITEM_H
 
 #include "Scene_triangulation_3_item_config.h"
+#include "Plugins/PCA/Scene_edit_box_item.h"
 #include "T3_type.h"
 
 #include <QVector>