diff --git a/CalcPocketing.cpp b/CalcPocketing.cpp
index 238df29..68e0ad6 100644
--- a/CalcPocketing.cpp
+++ b/CalcPocketing.cpp
@@ -58,6 +58,7 @@ struct PocketParams {
    bool bAboveHead = true ;                  // flag per testa da sopra ( Z+)
    bool bSmooth = false ;                    // curve smussate
    bool bInvert = false ;                    // inversione dei percorsi
+   bool bAvoidOpt = false ;                  // flag per evitare casi ottimizzati
    Point3d ptStart = P_INVALID ;             // punto d'inizio
    Point3d ptEnd = P_INVALID ;               // punto di fine
    SurfFlatRegion SfrLimit ;                 // superficie limite per estensione lati aperti
@@ -6107,9 +6108,9 @@ CalcSpiral( const ISurfFlatRegion* pSrfPock, const PocketParams& PockParams, int
 
   // CONTROLLO PER CASI OTTIMIZZATI
    bool bHasIsland = ( pSrfPock->GetLoopCount( 0) > 1) ;
-
   // se non ho isole e curva valida allora controllo casi ottimizzati
-   if ( ! bHasIsland  &&  ( ! vCrvOrigChunkLoops.empty())  &&  ! IsNull( vCrvOrigChunkLoops[0])) {
+   if ( ! PockParams.bAvoidOpt  &&  ! bHasIsland  &&
+        ( ! vCrvOrigChunkLoops.empty())  &&  ! IsNull( vCrvOrigChunkLoops[0])) {
 
      // --------------------------- caso spirale ---------------------------------------
       PtrOwner<ICurveComposite> pCrvBorder( ConvertCurveToComposite( pSrfPock->GetLoop( 0, 0))) ;
@@ -7242,7 +7243,7 @@ AddOneWay( const ISurfFlatRegion* pSrfPock, const ISurfFlatRegion* pSfrOrig, con
 //----------------------------------------------------------------------------
 bool
 CalcPocketing( const ISurfFlatRegion* pSfr, double dRad, double dRadOffs, double dStep, double dAngle, 
-               int nType, bool bSmooth, bool bInvert, ISurfFlatRegion* pSfrLimit, ICRVCOMPOPOVECTOR& vCrvCompoRes)
+               int nType, bool bSmooth, bool bInvert, bool bAvoidOpt, ISurfFlatRegion* pSfrLimit, ICRVCOMPOPOVECTOR& vCrvCompoRes)
 {
   // controllo dei parametri
    if ( pSfr == nullptr  ||  ! pSfr->IsValid()  ||
@@ -7262,6 +7263,7 @@ CalcPocketing( const ISurfFlatRegion* pSfr, double dRad, double dRadOffs, double
    myParams.dAngle = dAngle ;
    myParams.dSideStep = dStep ;
    myParams.bInvert = bInvert ;
+   myParams.bAvoidOpt = bAvoidOpt ;
    if ( pSfrLimit != nullptr  &&  pSfrLimit->IsValid())
       myParams.SfrLimit.CopyFrom( pSfrLimit) ;