diff --git a/EgtGraphics.sln b/EgtGraphics.sln
index 3efddda..7c2f747 100644
--- a/EgtGraphics.sln
+++ b/EgtGraphics.sln
@@ -1,6 +1,8 @@
 
-Microsoft Visual Studio Solution File, Format Version 11.00
-# Visual Studio 2010
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 2013
+VisualStudioVersion = 12.0.40629.0
+MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "EgtGraphics", "EgtGraphics.vcxproj", "{4EC970B1-B4D9-4088-8A31-B462CF72116E}"
 EndProject
 Global
diff --git a/SceneCamera.cpp b/SceneCamera.cpp
index bd8d545..c993051 100644
--- a/SceneCamera.cpp
+++ b/SceneCamera.cpp
@@ -305,11 +305,24 @@ Scene::ZoomAll( void)
 bool
 Scene::ZoomObject( int nId)
 {
-  // determino l'ingombro dell'oggetto in globale
-   BBox3d b3Obj ;
-   if ( m_pGeomDB == nullptr  ||  ! m_pGeomDB->GetGlobalBBox( nId, b3Obj))
+  // Verifico puntatore a DB geometrico
+   if ( m_pGeomDB == nullptr)
       return false ;
 
+  // determino l'ingombro dell'oggetto/i in globale
+   BBox3d b3Obj ;
+   if ( nId == GDB_ID_SEL) {
+      int nMyId = m_pGeomDB->GetFirstSelectedObj() ;
+      while ( nMyId != GDB_ID_NULL) {
+         BBox3d b3Curr ;
+         if ( m_pGeomDB->GetGlobalBBox( nMyId, b3Curr))
+            b3Obj.Add( b3Curr) ;
+         nMyId = m_pGeomDB->GetNextSelectedObj() ;
+      }
+   }
+   else
+      m_pGeomDB->GetGlobalBBox( nId, b3Obj) ;
+
   // recupero centro e diametro vista
    Point3d ptCent ;
    double dDiam ;