diff --git a/API_GdbGetSurf.cpp b/API_GdbGetSurf.cpp
index 7fb70c4..dd265d4 100644
--- a/API_GdbGetSurf.cpp
+++ b/API_GdbGetSurf.cpp
@@ -112,11 +112,46 @@ __stdcall EgtSurfTmFacetFromTria( int nId, int nT)
    return ExeSurfTmFacetFromTria( nId, nT) ;
 }
 
+//----------------------------------------------------------------------------
+BOOL
+__stdcall EgtSurfTmGetVertex( int nId, int nVert, int nRefId, double ptVert[3])
+{
+  // verifica parametri
+   if ( ptVert == nullptr)
+      return FALSE ;
+  // recupero il vertice
+   Point3d ptV ;
+   if ( ! ExeSurfTmGetVertex( nId, nVert, nRefId, ptV))
+      return FALSE ;
+  // lo assegno
+   VEC_FROM_3D( ptVert, ptV)
+   return TRUE ;
+}
+
+//-----------------------------------------------------------------------------
+BOOL
+__stdcall EgtSurfTmGetNearestVertex( int nId, const double ptNear[3], int nRefId, int* pnVert, double ptVert[3])
+{
+  // verifica parametri
+   if ( ptNear == nullptr  ||  pnVert == nullptr  ||  ptVert == nullptr)
+      return FALSE ;
+  // recupero indice del vertice e sue coordinate
+   Point3d ptTmp ;
+   if ( ! ExeSurfTmGetNearestVertex( nId, ptNear, nRefId, *pnVert, ptTmp))
+      return FALSE ;
+  // le assegno
+   VEC_FROM_3D( ptVert, ptTmp)
+   return TRUE ;
+}
+
 //----------------------------------------------------------------------------
 BOOL
 __stdcall EgtSurfTmFacetNearestEndPoint( int nId, int nFacet, const double ptNear[3], int nRefId,
                                          double ptEnd[3], double vtNorm[3])
 {
+  // verifica parametri
+   if ( ptNear == nullptr  ||  ptEnd == nullptr  ||  vtNorm == nullptr)
+      return FALSE ;
   // recupero il punto e la normale
    Point3d ptTmp ;
    Vector3d vtN ;
@@ -133,6 +168,9 @@ BOOL
 __stdcall EgtSurfTmFacetNearestMidPoint( int nId, int nFacet, const double ptNear[3], int nRefId,
                                          double ptMid[3], double vtNorm[3])
 {
+  // verifica parametri
+   if ( ptNear == nullptr  ||  ptMid == nullptr  ||  vtNorm == nullptr)
+      return FALSE ;
   // recupero il punto e la normale
    Point3d ptTmp ;
    Vector3d vtN ;
@@ -148,6 +186,9 @@ __stdcall EgtSurfTmFacetNearestMidPoint( int nId, int nFacet, const double ptNea
 BOOL
 __stdcall EgtSurfTmFacetCenter( int nId, int nFacet, int nRefId, double ptCen[3], double vtNorm[3])
 {
+  // verifica parametri
+   if ( ptCen == nullptr  ||  vtNorm == nullptr)
+      return FALSE ;
   // recupero il centro e la normale
    Point3d ptTmp ;
    Vector3d vtN ;
@@ -163,6 +204,9 @@ __stdcall EgtSurfTmFacetCenter( int nId, int nFacet, int nRefId, double ptCen[3]
 BOOL
 __stdcall EgtSurfTmFacetNormVersor( int nId, int nFacet, int nRefId, double vtNorm[3])
 {
+  // verifica parametri
+   if ( vtNorm == nullptr)
+      return FALSE ;
   // recupero il vettore normale
    Vector3d vtTmp ;
    if ( ! ExeSurfTmFacetNormVersor( nId, nFacet, nRefId, vtTmp))
diff --git a/API_GdbModifySurf.cpp b/API_GdbModifySurf.cpp
index 6a3702c..a92a47e 100644
--- a/API_GdbModifySurf.cpp
+++ b/API_GdbModifySurf.cpp
@@ -70,6 +70,20 @@ __stdcall EgtSurfFrOffset( int nId, double dDist, int nType)
    return ( ExeSurfFrOffset( nId,  dDist, nType) ? TRUE : FALSE) ;
 }
 
+//----------------------------------------------------------------------------
+BOOL
+__stdcall EgtSurfTmMoveVertex( int nId, int nVert, const double ptNewVert[3], int nRefType, BOOL bUpdate)
+{
+   return ( ExeSurfTmMoveVertex( nId, nVert, ptNewVert, nRefType, ( bUpdate != FALSE)) ? TRUE : FALSE) ;
+}
+
+//----------------------------------------------------------------------------
+BOOL
+__stdcall EgtSurfTmMoveFacet( int nId, int nFacet, const double vtMove[3], int nRefType, BOOL bUpdate)
+{
+   return ( ExeSurfTmMoveFacet( nId, nFacet, vtMove, nRefType, ( bUpdate != FALSE)) ? TRUE : FALSE) ;
+}
+
 //----------------------------------------------------------------------------
 int
 __stdcall EgtSurfTmToTriangles( int nId, int* pnCount)