diff --git a/CalcPocketing.cpp b/CalcPocketing.cpp
index edecc76..7f21973 100644
--- a/CalcPocketing.cpp
+++ b/CalcPocketing.cpp
@@ -1191,15 +1191,16 @@ CreateSurfFrIncidence( const ICurveComposite* pCrv, const PocketParams& PockPara
   // per sicurezza...
    pCrvExtLoopSurfInc->Close() ;
 
-  // creo la regione
-   if ( ! pSfrInc->AddExtLoop( Release( pCrvExtLoopSurfInc)))
+  // creo la regione ( la curva potrebbe autointersecarsi)
+   SurfFlatRegionByContours SfrByC ;
+   if ( ! SfrByC.AddCurve( Release( pCrvExtLoopSurfInc)))
       return false ;
 
-  // guarda Z_AX come normale
-   if ( pSfrInc->IsValid()  &&  pSfrInc->GetChunkCount() > 0) {
-      Vector3d vtN = pSfrInc->GetNormVersor() ;
-      if ( AreOppositeVectorApprox( vtN, Z_AX))
-         pSfrInc->Invert() ;
+   PtrOwner<ISurfFlatRegion> pSfr( SfrByC.GetSurf()) ;
+   if ( pSfr->IsValid()  &&  pSfr->GetChunkCount() > 0) {
+      if ( AreOppositeVectorApprox( pSfr->GetNormVersor(), Z_AX))
+         pSfr->Invert() ;
+      pSfrInc->CopyFrom( pSfr) ;
       return true ;
    }