diff --git a/EGkExtText.h b/EGkExtText.h
index 1ca517b..81c27fa 100644
--- a/EGkExtText.h
+++ b/EGkExtText.h
@@ -16,6 +16,8 @@
 #include "/EgtDev/Include/EGkGeoObj.h"
 #include "/EgtDev/Include/EGkCurve.h"
 
+class ISurfTriMesh ;
+
 //-----------------------------------------------------------------------------
 class __declspec( novtable) IExtText : public IGeoObj
 {
@@ -49,6 +51,7 @@ class __declspec( novtable) IExtText : public IGeoObj
       virtual bool SplitOnLineBreak( std::vector<IExtText*>& vText) const = 0 ;
       virtual bool ApproxWithLines( double dLinTol, double dAngTolDeg, POLYLINELIST& lstPL) const = 0 ;
       virtual bool ApproxWithArcs( double dLinTol, double dAngTolDeg, POLYARCLIST& lstPA) const = 0 ;
+      virtual const ISurfTriMesh* GetAuxSurf( void) const = 0 ;
       virtual bool Flip( void) = 0 ;
       virtual bool Mir( bool bOnLen) = 0 ;
       virtual bool ModifyText( const std::string& sText) = 0 ;
diff --git a/EGkSurfFlatRegion.h b/EGkSurfFlatRegion.h
index 3c823ff..269bd0a 100644
--- a/EGkSurfFlatRegion.h
+++ b/EGkSurfFlatRegion.h
@@ -15,6 +15,7 @@
 
 #include "/EgtDev/Include/EGkSurf.h"
 #include "/EgtDev/Include/EGkIntersCurves.h"
+#include "/EgtDev/Include/EgtPointerOwner.h"
 
 class ISurfTriMesh ;
 
@@ -64,6 +65,13 @@ inline ISurfFlatRegion* GetSurfFlatRegion( IGeoObj* pGObj)
                     return nullptr ;
                  return (static_cast<ISurfFlatRegion*>(pGObj)) ; }
 
+//----------------------------------------------------------------------------
+// Raccolte di puntatori a ISurfFlatRegion
+typedef std::vector<const ISurfFlatRegion*>    CISURFFRPVECTOR ;   // vettore di puntatori a const ISurfFlatRegion
+typedef std::vector<ISurfFlatRegion*>          ISURFFRPVECTOR ;    // vettore di puntatori a ISurfFlatRegion
+typedef std::list<ISurfFlatRegion*>            ISURFFRPLIST ;      // lista di puntatori a ISurfFlatRegion
+typedef std::vector<PtrOwner<ISurfFlatRegion>> ISURFFRPOVECTOR ;   // vettore di puntatori esclusivi a ISurfFlatRegion
+
 //-----------------------------------------------------------------------------
 // Costanti per classificazione di regioni
 const int REGC_NULL = 0 ;              //!< Non classificabili