diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index 5b66bd6..c9fb331 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/SfrCreate.cpp b/SfrCreate.cpp
index c720968..957dc03 100644
--- a/SfrCreate.cpp
+++ b/SfrCreate.cpp
@@ -17,6 +17,7 @@
 #include "CurveArc.h"
 #include "CurveComposite.h"
 #include "SurfFlatRegion.h"
+#include "AdjustLoops.h"
 #include "GeoConst.h"
 #include "/EgtDev/Include/EgkPolyLine.h"
 #include "/EgtDev/Include/EgkBiArcs.h"
@@ -363,8 +364,20 @@ SurfFlatRegionByContours::AddCurve( ICurve* pCrv)
   // verifico sia chiusa
    if ( ! pMyCrv->IsClosed())
       return false ;
-  // la inserisco nel vettore delle curve
-   m_vpCrv.push_back( Release( pMyCrv)) ;
+  // verifico sia piana e imposto estrusione come normale al piano
+   double dArea ;
+   Plane3d plPlane ;
+   if ( ! pMyCrv->GetArea( plPlane, dArea))
+      return false ;
+   pMyCrv->SetExtrusion( plPlane.GetVersN()) ;
+   pMyCrv->SetThickness( 0) ;
+  // rimuovo eventuali sovrapposizioni (calcolate nel suo piano)
+   ICURVEPLIST CrvLst ;
+   if ( ! AdjustLoops( Release( pMyCrv), CrvLst))
+      return false ;
+  // la/le inserisco nel vettore delle curve
+   for ( auto& pSingCrv : CrvLst)
+      m_vpCrv.push_back( pSingCrv) ;
    return true ;
 }
 
@@ -418,6 +431,7 @@ SurfFlatRegionByContours::GetSurf( void)
    if ( IsNull( pSfr))
       return nullptr ;
   // aggiungo le diverse curve
+   bool bExtLoop = false ;
    bool bFirstCrv  ;
    do {
       bFirstCrv = true ;
@@ -436,6 +450,7 @@ SurfFlatRegionByContours::GetSurf( void)
             }
            // provo a inserirla
             if ( pSfr->AddExtLoop( Release( pCrv))) {
+               bExtLoop = true ;
                bFirstCrv = false ;
                delete m_vpCrv[j] ;
                m_vpCrv[j] = nullptr ;
@@ -460,7 +475,7 @@ SurfFlatRegionByContours::GetSurf( void)
       }
    } while ( m_bAllowedMultiChunk  &&  ! bFirstCrv) ;
   // se non valida, errore
-   if ( ! pSfr->IsValid())
+   if ( ! bExtLoop  ||  ! pSfr->IsValid())
       return nullptr ;
   // restituisco la superficie
    return Release( pSfr) ;