diff --git a/EXE_GdbModifySurf.cpp b/EXE_GdbModifySurf.cpp
index 1859831..0d378ba 100644
--- a/EXE_GdbModifySurf.cpp
+++ b/EXE_GdbModifySurf.cpp
@@ -1185,7 +1185,10 @@ ExeSurfTmGetShowEdges( int nId, bool& bShow)
    ISurfTriMesh* pStm = GetSurfTriMesh( pGeomDB->GetGeoObj( nId)) ;
    bool bOk = ( pStm != nullptr) ;
   // recupero lo stato di visualizzazione degli spigoli vivi
-   bShow = ( bOk && pStm->GetShowEdges()) ;
+   if ( bOk)
+      bShow = pStm->GetShowEdges() ;
+   else
+      bShow = false ;
    return bOk ;
 }
 
@@ -1199,6 +1202,7 @@ ExeSurfTmSetSmoothAng( int nId, double dAngDeg)
    ISurfTriMesh* pSrfTm = GetSurfTriMesh( pGeomDB->GetGeoObj( nId)) ;
    if ( pSrfTm == nullptr)
       return false ;
+  // imposto l'angolo discriminante degli spigoli vivi
    pSrfTm->SetSmoothAngle( dAngDeg) ;
    ExeSetModified() ;
    // se richiesto, salvo il comando Lua equivalente
@@ -1210,6 +1214,23 @@ ExeSurfTmSetSmoothAng( int nId, double dAngDeg)
    return true ;
 }
 
+//----------------------------------------------------------------------------
+bool
+ExeSurfTmGetSmoothAng( int nId, double& dAngDeg)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // recupero la superficie trimesh
+   ISurfTriMesh* pStm = GetSurfTriMesh( pGeomDB->GetGeoObj( nId)) ;
+   bool bOk = ( pStm != nullptr) ;
+  // recupero l'angolo discriminante degli spigoli vivi
+   if ( bOk)
+      dAngDeg = pStm->GetSmoothAngle() ;
+   else
+      dAngDeg = 0 ;
+   return bOk ;
+}
+
 //----------------------------------------------------------------------------
 static double
 GetStmOffsPrec( double dOffs, double dLinTol)
diff --git a/EXE_GdbModifyVol.cpp b/EXE_GdbModifyVol.cpp
index 3866ea2..32b30da 100644
--- a/EXE_GdbModifyVol.cpp
+++ b/EXE_GdbModifyVol.cpp
@@ -142,6 +142,23 @@ ExeVolZmapSetShowEdges( int nId, bool bShow)
    return bOk ;
 }
 
+//----------------------------------------------------------------------------
+bool
+ExeVolZmapGetShowEdges( int nId, bool& bShow)
+{
+   IGeomDB* pGeomDB = GetCurrGeomDB() ;
+   VERIFY_GEOMDB( pGeomDB, false)
+  // recupero lo Zmap
+   IVolZmap* pVZM = GetVolZmap( pGeomDB->GetGeoObj( nId)) ;
+   bool bOk = ( pVZM != nullptr) ;
+  // leggo lo stato di visualizzazione degli spigoli vivi
+   if ( bOk)
+      bShow = pVZM->GetShowEdges() ;
+   else
+      bShow = false ;
+   return bOk ;
+}
+
 //-------------------------------------------------------------------------------
 bool
 ExeRemoveVolZmapPart( int nId, int nPart)
diff --git a/EXE_Scene.cpp b/EXE_Scene.cpp
index be755fc..00d0a18 100644
--- a/EXE_Scene.cpp
+++ b/EXE_Scene.cpp
@@ -267,6 +267,21 @@ ExeDraw( void)
    return true ;
 }
 
+//-----------------------------------------------------------------------------
+bool
+ExeRedraw( void)
+{
+  // se interfaccia disabilitata, esco subito
+   if ( ! ExeGetEnableUI())
+      return true ;
+
+   IEGrScene* pScene = GetCurrScene() ;
+   VERIFY_SCENE( pScene, false)
+  // forzo ridisegno
+   pScene->RedrawWindow() ;
+   return true ;
+}
+
 //-----------------------------------------------------------------------------
 bool
 ExeSelect( int nWinX, int nWinY, int nSelW, int nSelH, int* pnSel)
diff --git a/EgtExecutor.rc b/EgtExecutor.rc
index 504683b..a75731e 100644
Binary files a/EgtExecutor.rc and b/EgtExecutor.rc differ
diff --git a/LUA_GdbModifySurf.cpp b/LUA_GdbModifySurf.cpp
index a775a48..ee3bbe0 100644
--- a/LUA_GdbModifySurf.cpp
+++ b/LUA_GdbModifySurf.cpp
@@ -565,7 +565,7 @@ LuaSurfTmGetShowEdges( lua_State* L)
 static int
 LuaSurfTmSetSmoothAng( lua_State* L)
 {
-  // 2 parametri : nId, nCutterId
+  // 2 parametri : nId, dAngDeg
    int nId ;
    LuaCheckParam( L, 1, nId)
    double dAngDeg ;
@@ -577,6 +577,24 @@ LuaSurfTmSetSmoothAng( lua_State* L)
    return 1 ;
 }
 
+//-------------------------------------------------------------------------------
+static int
+LuaSurfTmGetSmoothAng( lua_State* L)
+{
+  // 1 parametro : nId
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   LuaClearStack( L) ;
+  // recupero lo smooth angle della superficie
+   double dAngDeg ;
+   bool bOk = ExeSurfTmGetSmoothAng( nId, dAngDeg) ;
+   if ( bOk)
+      LuaSetParam( L, dAngDeg) ;
+   else
+      LuaSetParam( L) ;
+   return 1 ;
+}
+
 //-------------------------------------------------------------------------------
 static int
 LuaSurfTmOffset( lua_State* L)
@@ -664,7 +682,7 @@ LuaSurfBzTrim( lua_State* L)
 bool
 LuaInstallGdbModifySurf( LuaMgr& luaMgr)
 {
-   bool bOk = ( &luaMgr != nullptr) ;
+   bool bOk = true ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtInvertSurf", LuaInvertSurf) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtExplodeSurf", LuaExplodeSurf) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtApproxSurf", LuaApproxSurf) ;
@@ -694,6 +712,7 @@ LuaInstallGdbModifySurf( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmSetShowEdges", LuaSurfTmSetShowEdges) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmGetShowEdges", LuaSurfTmGetShowEdges) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmSetSmoothAng", LuaSurfTmSetSmoothAng) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmGetSmoothAng", LuaSurfTmGetSmoothAng) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmOffset", LuaSurfTmOffset) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSurfTmThickeningOffset", LuaSurfTmThickeningOffset) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtCutSurfBzPlane", LuaCutSurfBzPlane) ;
diff --git a/LUA_GdbModifyVol.cpp b/LUA_GdbModifyVol.cpp
index 3ea1e93..3c543d5 100644
--- a/LUA_GdbModifyVol.cpp
+++ b/LUA_GdbModifyVol.cpp
@@ -73,6 +73,25 @@ LuaVolZmapSetShowEdges( lua_State* L)
    return 1 ;
 }
 
+//-------------------------------------------------------------------------------
+static int
+LuaVolZmapGetShowEdges( lua_State* L)
+{
+  // 1 parametro : Id
+   int nId ;
+   LuaCheckParam( L, 1, nId)
+   LuaClearStack( L) ;
+  // imposto flag visualizzazione spigoli vivi
+   bool bShow ;
+   bool bOk = ExeVolZmapGetShowEdges( nId, bShow) ;
+  // restituisco il risultato
+   if ( bOk)
+      LuaSetParam( L, bShow) ;
+   else
+      LuaSetParam( L) ;
+   return 1 ;
+}
+
 //----------------------------------------------------------------------------
 static int
 LuaRemoveVolZmapPart( lua_State* L)
@@ -465,6 +484,7 @@ LuaInstallGdbModifyVol( LuaMgr& luaMgr)
    bOk = bOk && luaMgr.RegisterFunction( "EgtExplodeVolume", LuaExplodeVolume) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapChangeResolution", LuaVolZmapChangeResolution) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapSetShowEdges", LuaVolZmapSetShowEdges) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapGetShowEdges", LuaVolZmapGetShowEdges) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtRemoveVolZmapPart", LuaRemoveVolZmapPart) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapSetStdTool", LuaVolZmapSetStdTool) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtVolZmapSetAdvTool", LuaVolZmapSetAdvTool) ;
diff --git a/LUA_Scene.cpp b/LUA_Scene.cpp
index ddd759f..cabe7de 100644
--- a/LUA_Scene.cpp
+++ b/LUA_Scene.cpp
@@ -73,6 +73,19 @@ LuaDraw( lua_State* L)
    return 1 ;
 }
 
+//-------------------------------------------------------------------------------
+static int
+LuaRedraw( lua_State* L)
+{
+  // nessun parametro
+   LuaClearStack( L) ;
+  // forzo ridisegno
+   bool bOk = ExeRedraw() ;
+  // restituisco il risultato
+   LuaSetParam( L, bOk) ;
+   return 1 ;
+}
+
 //-------------------------------------------------------------------------------
 static int
 LuaSetShowMode( lua_State* L)
@@ -378,10 +391,11 @@ LuaSetShowSurfBezierTol( lua_State* L)
 bool
 LuaInstallScene( LuaMgr& luaMgr)
 {
-   bool bOk = ( &luaMgr != nullptr) ;
+   bool bOk = true ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSetBackground", LuaSetBackground) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtGetBackground", LuaGetBackground) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtDraw", LuaDraw) ;
+   bOk = bOk && luaMgr.RegisterFunction( "EgtRedraw", LuaRedraw) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSetShowMode", LuaSetShowMode) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSetShowCurveDirection", LuaSetShowCurveDirection) ;
    bOk = bOk && luaMgr.RegisterFunction( "EgtSetShowTriaAdv", LuaSetShowTriaAdv) ;