diff --git a/EgtGraphics.rc b/EgtGraphics.rc
index e60fd05..bbc3e2b 100644
Binary files a/EgtGraphics.rc and b/EgtGraphics.rc differ
diff --git a/SceneGeom.cpp b/SceneGeom.cpp
index c45fe9f..9877f84 100644
--- a/SceneGeom.cpp
+++ b/SceneGeom.cpp
@@ -164,6 +164,9 @@ Scene::DrawGeoObj( const IGdbIterator& iIter, int nPass, const MdStMkCol& siObj)
       return false ;
    int nGeoType = pGeoObj->GetType() ;
 
+  // recupero eventuale parte custom
+   const IUserObj* pUserObj = iIter.GetUserObj() ;
+
   // se non esiste grafica associata, la creo
    if ( pGeoObj->GetObjGraphics() == nullptr) {
      // nuova modalità grafica solo per superfici con molti triangoli
@@ -315,15 +318,22 @@ Scene::DrawGeoObj( const IGdbIterator& iIter, int nPass, const MdStMkCol& siObj)
          pTXT->ApproxWithLines( 0.01, 5, lstPL) ;
          pGraphics->Clear() ;
          pGraphics->AddColor( siObj.colObj) ;
-         POLYLINELIST::iterator Iter ;
-         for ( Iter = lstPL.begin() ; Iter != lstPL.end() ; ++ Iter)
-            pGraphics->AddPolyLine( *Iter) ; 
+         for ( const auto& PL : lstPL)
+            pGraphics->AddPolyLine( PL) ; 
+      }
+     // se esiste parte custom
+      if ( pUserObj != nullptr) {
+         POLYLINELIST lstPL ;
+         if ( pUserObj->GetDrawPolyLines( lstPL)) {
+            for ( const auto& PL : lstPL)
+               pGraphics->AddPolyLine( PL, true) ; 
+         }
       }
    }
 
   // se richiesto, visualizzo la grafica associata
    bool bShowAux = false ;
-   if ( ( nGeoType & GEO_CURVE) != 0  &&  m_bShowCurveDirection)
+   if ( (( nGeoType & GEO_CURVE) != 0  ||  pUserObj != nullptr)  &&  m_bShowCurveDirection)
       bShowAux = true ;
 
   // recupero il valore di opacità (solo per le superfici può esserci trasparenza)
@@ -390,15 +400,15 @@ Scene::DrawAlphaSurfVector( void)
          []( const AlphaSurf& a, const AlphaSurf&b) { return a.dZmax < b.dZmax ; }) ;
 
   // eseguo visualizzazione
-   for ( int i = 0 ; i < int( m_vAlphaSurf.size()) ; ++i) {
+   for ( const auto& AlphaSurf : m_vAlphaSurf) {
      // imposto matrice MODELVIEW
       double Matrix[OGLMAT_DIM] ;
-      FrameToOpenGlMatrix( m_vAlphaSurf[i].frModView, Matrix) ;
+      FrameToOpenGlMatrix( AlphaSurf.frModView, Matrix) ;
       glPushMatrix() ;
       glLoadMatrixd( Matrix) ;
      // eseguo visualizzazione
-      bool bOk = m_vAlphaSurf[i].pGraph->Draw( m_vAlphaSurf[i].nStat, m_vAlphaSurf[i].nMark, true,
-                                               m_vAlphaSurf[i].nAlpha, m_vAlphaSurf[i].bShowAux) ;
+      bool bOk = AlphaSurf.pGraph->Draw( AlphaSurf.nStat, AlphaSurf.nMark, true,
+                                         AlphaSurf.nAlpha, AlphaSurf.bShowAux) ;
      // ripristino matrice
       glPopMatrix() ;
      // in caso di errore, esco