diff --git a/EgtGraphics.rc b/EgtGraphics.rc
index ee67fa7..9293092 100644
Binary files a/EgtGraphics.rc and b/EgtGraphics.rc differ
diff --git a/SceneCamera.cpp b/SceneCamera.cpp
index c993051..0870196 100644
--- a/SceneCamera.cpp
+++ b/SceneCamera.cpp
@@ -315,23 +315,31 @@ Scene::ZoomObject( int nId)
       int nMyId = m_pGeomDB->GetFirstSelectedObj() ;
       while ( nMyId != GDB_ID_NULL) {
          BBox3d b3Curr ;
-         if ( m_pGeomDB->GetGlobalBBox( nMyId, b3Curr))
+         if ( m_pGeomDB->GetGlobalBBox( nMyId, b3Curr, BBF_ONLY_VISIBLE))
             b3Obj.Add( b3Curr) ;
          nMyId = m_pGeomDB->GetNextSelectedObj() ;
       }
    }
    else
-      m_pGeomDB->GetGlobalBBox( nId, b3Obj) ;
+      m_pGeomDB->GetGlobalBBox( nId, b3Obj, BBF_ONLY_VISIBLE) ;
 
-  // recupero centro e diametro vista
+  // recupero centro
    Point3d ptCent ;
-   double dDiam ;
-   if ( ! b3Obj.GetCenter( ptCent)  ||  ! b3Obj.GetDiameter( dDiam))
+   if ( ! b3Obj.GetCenter( ptCent))
       return false ;
 
+  // determino le dimensioni di vista nel riferimento di vista
+   Frame3d frView ;
+   if ( ! CalcCameraFrame( frView))
+      return false ;
+   b3Obj.ToLoc( frView) ;
+   const double COEFF = 1.05 ;
+   double dHalfWidth = COEFF * ( b3Obj.GetMax().x - b3Obj.GetMin().x) / 2 ;
+   double dHalfHeight = COEFF * ( b3Obj.GetMax().y - b3Obj.GetMin().y) / 2 ;
+
   // imposto il centro e le dimensioni di vista
    m_ptCenter = ptCent ;
-   return AdjustDimView( dDiam / 2, dDiam / 2) ;
+   return AdjustDimView( dHalfWidth, dHalfHeight) ;
 }
 
 //----------------------------------------------------------------------------