diff --git a/bind/G4Calo.py b/bind/G4Calo.py
index b4663fd..c2eed20 100644
--- a/bind/G4Calo.py
+++ b/bind/G4Calo.py
@@ -212,7 +212,7 @@ def _fill_event(gd : GeometryDescriptor,
     
     from  G4Calo import __G4System
     G4System = __G4System()
-    G4System.init(gd, 1)
+    G4System.init(gd, -1)
     G4System.run_batch(1, particleSpec, energy, energy,"")
     return gd
         
@@ -258,7 +258,7 @@ def display_event(gd : GeometryDescriptor,
                                              'color': col_dict[layer_material], 
                                              'showlegend': False, 
                                              'flatshading': True, 
-                                             'opacity': 0.2}
+                                             'opacity': 0.2 * 20. / len(gd.getLayers())}
             # add legend entry
             to_plot.append(go.Mesh3d(x=[None], y=[None], z=[None], i=[0], j=[0], k=[0], 
                                      color=material_dict[layer_material]['color'], 
@@ -300,7 +300,7 @@ def display_event(gd : GeometryDescriptor,
                     flatshading=True,
                     color='black',
                     name='Sensor',
-                    opacity= max(0.03, use_energy),
+                    opacity= use_energy, #max(0.03, use_energy),
                     showlegend=False,
                 )) 
                
@@ -379,6 +379,8 @@ def display_event(gd : GeometryDescriptor,
     #name the axes in the HEP way, so y and z switch names
     fig.update_layout(scene=dict(xaxis_title='x [mm]', yaxis_title='z [mm]', zaxis_title='y [mm]'))
     
+    #fig.write_html("temp.html")
+    #exit()
     if renderer is not None:
         fig.show(renderer=renderer) 
     else: