diff --git a/Export3dm.cpp b/Export3dm.cpp
index 2ce63c7..099fa03 100644
--- a/Export3dm.cpp
+++ b/Export3dm.cpp
@@ -755,13 +755,36 @@ Export3dm::ConvertText( const IExtText* pText, const Frame3d& frDim)
    wstring wText = wstring(sText.begin(), sText.end());
    const wchar_t* wcText = wText.c_str();
    ON_Text* ontText = new ON_Text() ;
-   const ON_DimStyle onDimStyle = ON_DimStyle::DimStyleOrDefault( nullptr) ;
+   double dHeight = pText->GetHeight() ;
+   // controllo se esiste già un dim style con quell'altezza sennò lo creo
+   ON_DimStyle onDimStyle = ON_DimStyle::SystemDimstyleFromIndex( -1) ; // default
+   const ON_DimStyle* onDimStyleNew = nullptr ;
+   ONX_ModelComponentIterator component_iterator_ds( m_model, ON_ModelComponent::Type::DimStyle) ;
+   bool bFound = false ;
+   for ( const ON_ModelComponent* mc = component_iterator_ds.FirstComponent() ; mc != nullptr ; mc = component_iterator_ds.NextComponent()) {
+      const ON_DimStyle* onDim = ON_DimStyle::Cast( mc) ;
+      double dTextHeight = onDim->TextHeight() ;
+      if ( abs( dHeight - dTextHeight) < 0.1 ) {
+         onDimStyle = *onDim ;
+         bFound = true ;
+         break ;
+      }
+   }
+   if ( ! bFound) {
+      ON_DimStyle onDimStyleOver = onDimStyle.CreateOverrideCandidate() ;
+      onDimStyleOver.SetFieldOverride( ON_DimStyle::field::TextHeight, true) ;
+      onDimStyleOver.SetTextHeight( dHeight) ;
+      ON_ModelComponentReference mcr = m_model.AddModelComponent( onDimStyleOver, true) ;
+      onDimStyleNew = ON_DimStyle::FromModelComponentRef( mcr, nullptr) ;
+   }
    // il punto di riferimento di rhino è in alto a sinistra, mentre il nostro è in basso a sinistra
-   // per mettere il testo nella stessa posizione mi serve l'altezza che verrà usata in Rhino
    Point3d pt ; pText->GetOverStartPoint( pt) ;
    ON_Plane onPlane( ConvertPoint( pt), ConvertVector(frDim.VersX()), ConvertVector(frDim.VersY())) ;
    BBox3d bbox3d ; pText->GetBBox( GLOB_FRM, bbox3d, 0) ;
-   ontText->Create( wcText, &onDimStyle, onPlane, true, bbox3d.GetDimX(), 0.) ;
+   if ( onDimStyleNew != nullptr)
+      ontText->Create( wcText, onDimStyleNew, onPlane, true, bbox3d.GetDimX() * 10, 0.) ;
+   else
+      ontText->Create( wcText, &onDimStyle, onPlane, true, bbox3d.GetDimX() * 10, 0.) ;
    return ontText ;
 }
 
diff --git a/Import3dm.cpp b/Import3dm.cpp
index c1a4cd0..a1d0d22 100644
--- a/Import3dm.cpp
+++ b/Import3dm.cpp
@@ -632,7 +632,7 @@ Import3dm::ConvertSurface( const ON_Surface* onSurf)
       PtrOwner<ON_Curve> onpCrvSouth( onSumSurface->IsoCurve(0, onIntDomain1[0])) ;
       PtrOwner<ICurve> pCrvWest( ConvertCurve( onpCrvWest)) ;
       PtrOwner<ICurve> pCrvSouth( ConvertCurve( onpCrvSouth)) ;
-      PtrOwner<ISurfTriMesh> pSurfTm ( GetSurfTriMeshSwept( pCrvSouth, pCrvWest, V_NULL, false)) ;
+      PtrOwner<ISurfTriMesh> pSurfTm ( GetSurfTriMeshSwept( pCrvSouth, pCrvWest, false, false)) ;
       if ( ! IsNull( pSurfTm)  &&  pSurfTm->IsValid())
          return Release( pSurfTm) ;