diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index f3f7b94..cef4341 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/StmFromCurves.cpp b/StmFromCurves.cpp
index a35ed06..c2d3097 100644
--- a/StmFromCurves.cpp
+++ b/StmFromCurves.cpp
@@ -1300,7 +1300,7 @@ GetSurfTriMeshSwept( const ISurfFlatRegion* pSfrSect, const ICurve* pGuide, cons
          }
       }
      // creo il cap sull'inizio e lo attacco alla swept ( è già in posizione giusta)
-      PtrOwner<ISurfTriMesh> pSci( CreateSurfTriMesh()) ;
+      PtrOwner<SurfTriMesh> pSci( CreateBasicSurfTriMesh()) ;
       INTMATRIX vnPLIndMat ;
       if ( ! pSci->CreateByRegion( vPLi, vnPLIndMat))
          return nullptr ;
@@ -1310,7 +1310,7 @@ GetSurfTriMeshSwept( const ISurfFlatRegion* pSfrSect, const ICurve* pGuide, cons
       if ( ! pStmSwept->GetLoops( vPLe))
          return nullptr ;
      // creo la superficie alla fine e la attacco
-      PtrOwner<ISurfTriMesh> pSce( CreateSurfTriMesh()) ;
+      PtrOwner<SurfTriMesh> pSce( CreateBasicSurfTriMesh()) ;
       vnPLIndMat.clear() ;
       if ( ! pSce->CreateByRegion( vPLe, vnPLIndMat))
          return nullptr ;
diff --git a/StmStandard.cpp b/StmStandard.cpp
index e32198a..edc409a 100644
--- a/StmStandard.cpp
+++ b/StmStandard.cpp
@@ -22,6 +22,18 @@
 
 using namespace std ;
 
+//-------------------------------------------------------------------------------
+ISurfTriMesh*
+GetSurfTriMeshEmpty( void)
+{
+  // creo oggetto con superficie vuota
+   PtrOwner<SurfTriMesh> pStm( CreateBasicSurfTriMesh()) ;
+   if ( IsNull( pStm)  ||  ! pStm->AdjustTopology())
+      return nullptr ;
+  // restituisco la superficie
+   return Release( pStm) ;
+}
+
 //-------------------------------------------------------------------------------
 static SurfTriMesh*
 GetStandardSurfTriMeshBox( double dDimX, double dDimY, double dHeight)
diff --git a/SurfTriMesh.h b/SurfTriMesh.h
index 08a0e00..d8ca79f 100644
--- a/SurfTriMesh.h
+++ b/SurfTriMesh.h
@@ -251,7 +251,6 @@ class SurfTriMesh : public ISurfTriMesh, public IGeoObjRW
       bool RemoveTriangle( int nId) override ;
       bool AdjustTopology( void) override ;
       bool CreateByFlatContour( const PolyLine& PL) override ;
-      bool CreateByRegion( const POLYLINEVECTOR& vPL, const INTMATRIX& vnPLIndMat) override ;
       bool CreateByExtrusion( const PolyLine& PL, const Vector3d& vtExtr) override ;
       bool CreateByPointCurve( const Point3d& ptP, const PolyLine& PL) override ;
       bool CreateByTwoCurves( const PolyLine& PL1, const PolyLine& PL2, int nRuledType) override ;
@@ -365,6 +364,7 @@ class SurfTriMesh : public ISurfTriMesh, public IGeoObjRW
                        LOG_ERROR( GetEGkLogger(), "SurfTriMesh : copy error")
                     return *this ; }
       bool Clear( void) ;
+      bool CreateByRegion( const POLYLINEVECTOR& vPL, const INTMATRIX& vnPLIndMat) ;
       bool ExistsTriangle( int nT) const
               { return ( nT >= 0  &&  nT < GetTriangleSize()  &&  m_vTria[nT].nIdVert[0] != SVT_DEL) ; }
       bool GetTriangleAdjacencies( int nId, int nIdAdjTriaId[3]) const ;