diff --git a/EgtGraphics.rc b/EgtGraphics.rc
index bbc3e2b..0f1e8e0 100644
Binary files a/EgtGraphics.rc and b/EgtGraphics.rc differ
diff --git a/SceneGeom.cpp b/SceneGeom.cpp
index 25c2b8d..c489c98 100644
--- a/SceneGeom.cpp
+++ b/SceneGeom.cpp
@@ -187,6 +187,7 @@ Scene::DrawGeoObj( const IGdbIterator& iIter, int nPass, const MdStMkCol& siObj)
   // se la grafica associata non è valida la ricalcolo
    ObjEGrGraphics* pGraphics = GetObjEGrGraphics( pGeoObj) ;
    if ( ! pGraphics->IsValid()) {
+      const double ANG_TOL_GRAPH_DEG = 15 ;
      // se vettore
       if ( nGeoType == GEO_VECT3D) {
         // recupero il vettore
@@ -238,7 +239,7 @@ Scene::DrawGeoObj( const IGdbIterator& iIter, int nPass, const MdStMkCol& siObj)
             return false ;
         // calcolo la grafica
          PolyLine PL ;
-         pCurve->ApproxWithLines( 0.005, 5, ICurve::APL_STD, PL) ;
+         pCurve->ApproxWithLines( EPS_SMALL, ANG_TOL_GRAPH_DEG, ICurve::APL_STD, PL) ;
          pGraphics->Clear() ;
          pGraphics->AddColor( siObj.colObj) ;
          pGraphics->AddPolyLine( PL) ; 
@@ -315,7 +316,7 @@ Scene::DrawGeoObj( const IGdbIterator& iIter, int nPass, const MdStMkCol& siObj)
             return false ;
         // calcolo la grafica
          POLYLINELIST lstPL ;
-         pTXT->ApproxWithLines( 0.01, 5, lstPL) ;
+         pTXT->ApproxWithLines( 10 * EPS_SMALL, ANG_TOL_GRAPH_DEG, lstPL) ;
          pGraphics->Clear() ;
          pGraphics->AddColor( siObj.colObj) ;
          for ( const auto& PL : lstPL)