diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index 9fbeeab..21309bc 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/IntersCurveCurve.cpp b/IntersCurveCurve.cpp
index 6614430..3ee9ee0 100644
--- a/IntersCurveCurve.cpp
+++ b/IntersCurveCurve.cpp
@@ -642,4 +642,61 @@ IntersCurveCurve::GetCurveOutClass( const ICurve* pCurve, int& nClass)
       return false ;
    nClass = (( dArea > 0) ? CRVC_OUT : CRVC_IN) ;
    return true ;
-}
\ No newline at end of file
+}
+
+//----------------------------------------------------------------------------
+int
+IntersCurveCurve::GetRegionCurveClassification( void)
+{
+  // classifico la prima curva rispetto alla seconda
+   CRVCVECTOR ccClass ;
+   if ( ! GetCurveClassification( 0, ccClass))
+      return CCREGC_NULL ;
+  // derivo la classificazione delle curve come regioni
+   bool bIn = false ;
+   bool bOut = false ;
+   bool bOnP = false ;
+   bool bOnM = false ;
+   for ( auto& ccOne : ccClass) {
+      switch ( ccOne.nClass) {
+      case CRVC_IN :
+         bIn = true ;
+         break ;
+      case CRVC_OUT :
+         bOut = true ;
+         break ;
+      case CRVC_ON_P :
+         bOnP = true ;
+         break ;
+      case CRVC_ON_M :
+         bOnM = true ;
+         break ;
+      default :
+         return CCREGC_NULL ;
+      }
+   }
+   if ( bIn) {
+      if ( bOut)
+         return CCREGC_INTERS ;
+      else
+         return CCREGC_IN1 ;
+   }
+   if ( bOut) {
+      if ( bOnM)
+         return CCREGC_OUT ;
+      if ( bOnP)
+         return CCREGC_IN2 ;
+      CRVCVECTOR ccClass2 ;
+      if ( ! GetCurveClassification( 1, ccClass2)  ||  ccClass2.empty())
+         return CCREGC_NULL ;
+      if ( ccClass2[0].nClass == CRVC_OUT)
+         return CCREGC_OUT ;
+      else
+         return CCREGC_IN2 ;
+   }
+   if ( bOnP)
+      return CCREGC_SAME ;
+   if ( bOnM)
+      return CCREGC_OUT ;
+   return CCREGC_NULL ;
+}
diff --git a/SurfFlatRegion.cpp b/SurfFlatRegion.cpp
index c411b3a..6c349a5 100644
--- a/SurfFlatRegion.cpp
+++ b/SurfFlatRegion.cpp
@@ -1235,55 +1235,19 @@ SurfFlatRegion::GetChunkSimpleClassification( int nChunk, const ISurfFlatRegion&
 
   // classifico il loop esterno del chunk della prima regione rispetto a quello del chunk della seconda
    IntersCurveCurve ccInt( *pCrv1Loc, *pCrv2Loc) ;
-   CRVCVECTOR ccClass ;
-   if ( ! ccInt.GetCurveClassification( 0, ccClass))
+   int nClass = ccInt.GetRegionCurveClassification() ;
+   switch ( nClass){
+   default :   // CCREGC_NULL
       return REGC_NULL ;
-  // derivo la classificazione dei chunk delle regioni
-   bool bIn = false ;
-   bool bOut = false ;
-   bool bOnP = false ;
-   bool bOnM = false ;
-   for ( auto& ccOne : ccClass) {
-      switch ( ccOne.nClass) {
-      case CRVC_IN :
-         bIn = true ;
-         break ;
-      case CRVC_OUT :
-         bOut = true ;
-         break ;
-      case CRVC_ON_P :
-         bOnP = true ;
-         break ;
-      case CRVC_ON_M :
-         bOnM = true ;
-         break ;
-      default :
-         return REGC_NULL ;
-      }
-   }
-   if ( bIn) {
-      if ( bOut)
-         return REGC_INTERS ;
-      else
-         return REGC_IN1 ;
-   }
-   if ( bOut) {
-      if ( bOnM)
-         return REGC_OUT ;
-      if ( bOnP)
-         return REGC_IN2 ;
-      CRVCVECTOR ccClass2 ;
-      if ( ! ccInt.GetCurveClassification( 1, ccClass2)  ||  ccClass2.empty())
-         return REGC_NULL ;
-      if ( ccClass2[0].nClass == CRVC_OUT)
-         return REGC_OUT ;
-      else
-         return REGC_IN2 ;
-   }
-   if ( bOnP)
+   case CCREGC_IN1 :
+      return REGC_IN1 ;
+   case CCREGC_IN2 :
+      return REGC_IN2 ;
+   case CCREGC_SAME :
       return REGC_SAME ;
-   if ( bOnM)
+   case CCREGC_OUT :
       return REGC_OUT ;
-
-   return REGC_NULL ;
+   case CCREGC_INTERS :
+      return REGC_INTERS ;
+    }
 }