diff --git a/SurfTriMesh.cpp b/SurfTriMesh.cpp
index f521865..374f1f1 100644
--- a/SurfTriMesh.cpp
+++ b/SurfTriMesh.cpp
@@ -1148,7 +1148,7 @@ SurfTriMesh::GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR&
          if ( ! IsNull( pSfrTria)) {
             if ( bAllTria  &&  Tria.GetN() * vtVers < 0)
                pSfrTria->Invert() ;
-            pSfrTria->Offset( dTol, ICurve::OFF_FILLET) ;
+            pSfrTria->Offset( dTol, ICurve::OFF_CHAMFER) ;
             if ( IsNull( pSfr))
                pSfr.Set( pSfrTria) ;
             else
@@ -1164,7 +1164,7 @@ SurfTriMesh::GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR&
       return false ;
 
   // Effettuo contro-offset
-   pSfr->Offset( -dTol, ICurve::OFF_EXTEND) ;
+   pSfr->Offset( -dTol, ICurve::OFF_CHAMFER) ;
 
   // Recupero i contorni della regione
    for ( int i = 0 ; i < pSfr->GetChunkCount() ; ++ i) {
@@ -1219,7 +1219,7 @@ SurfTriMesh::GetSilhouette( const Plane3d& plPlane, double dTol, POLYLINEVECTOR&
             if ( ! IsNull( pSfrTria)) {
                if ( bAllTria  &&  Tria.GetN() * vtVers < 0)
                   pSfrTria->Invert() ;
-               pSfrTria->Offset( dTol, ICurve::OFF_FILLET) ;
+               pSfrTria->Offset( dTol, ICurve::OFF_CHAMFER) ;
                if ( IsNull( pSfr))
                   pSfr.Set( pSfrTria) ;
                else
@@ -1236,7 +1236,7 @@ SurfTriMesh::GetSilhouette( const Plane3d& plPlane, double dTol, POLYLINEVECTOR&
       return true ;
 
   // Effettuo contro-offset
-   pSfr->Offset( -dTol, ICurve::OFF_EXTEND) ;
+   pSfr->Offset( -dTol, ICurve::OFF_CHAMFER) ;
 
   // Recupero i contorni della regione
    for ( int i = 0 ; i < pSfr->GetChunkCount() ; ++ i) {