diff --git a/SurfTriMesh.cpp b/SurfTriMesh.cpp
index 7d883c9..cb7f6c0 100644
--- a/SurfTriMesh.cpp
+++ b/SurfTriMesh.cpp
@@ -1150,7 +1150,7 @@ SurfTriMesh::MarchOneTria( int& nT, int& nV, int nTimeStamp,
 
 //----------------------------------------------------------------------------
 bool
-SurfTriMesh::GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR& vPL, bool bAllTria) const
+SurfTriMesh::GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR& vPL, bool bAllTria, double dLinTol) const
 {
   // Verifico lo stato
    if ( m_nStatus != OK)
@@ -1163,6 +1163,7 @@ SurfTriMesh::GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR&
 
   // Controlli su tolleranza
    dTol = max( dTol, 100 * EPS_SMALL) ;
+   double dMyLinTol = max( EPS_SMALL, dLinTol) ;
 
   // Determino il riferimento di proiezione
    Frame3d frOCS ; frOCS.Set( ORIG, vtVers) ;
@@ -1210,7 +1211,7 @@ SurfTriMesh::GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR&
    for ( int i = 0 ; i < pSfr->GetChunkCount() ; ++ i) {
       for ( int j = 0 ; j < pSfr->GetLoopCount( i) ; ++ j) {
          PolyLine PL ;
-         if ( ! pSfr->ApproxLoopWithLines( i, j, LIN_TOL_STD, ANG_TOL_STD_DEG, ICurve::APL_STD, PL)) {
+         if ( ! pSfr->ApproxLoopWithLines( i, j, dMyLinTol, ANG_TOL_STD_DEG, ICurve::APL_STD, PL)) {
             vPL.clear() ;
             return false ;
          }
@@ -1223,7 +1224,7 @@ SurfTriMesh::GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR&
 
 //----------------------------------------------------------------------------
 bool
-SurfTriMesh::GetSilhouette( const Plane3d& plPlane, double dTol, POLYLINEVECTOR& vPL, bool bAllTria) const
+SurfTriMesh::GetSilhouette( const Plane3d& plPlane, double dTol, POLYLINEVECTOR& vPL, bool bAllTria, double dLinTol) const
 {
   // Verifico lo stato
    if ( m_nStatus != OK)
@@ -1236,6 +1237,7 @@ SurfTriMesh::GetSilhouette( const Plane3d& plPlane, double dTol, POLYLINEVECTOR&
 
   // Controlli su tolleranza
    dTol = max( dTol, 100 * EPS_SMALL) ;
+   double dMyLinTol = max( EPS_SMALL, dLinTol) ;
 
   // Determino il riferimento di proiezione
    Frame3d frOCS ; frOCS.Set( plPlane.GetPoint(), vtVers) ;
@@ -1289,7 +1291,7 @@ SurfTriMesh::GetSilhouette( const Plane3d& plPlane, double dTol, POLYLINEVECTOR&
    for ( int i = 0 ; i < pSfr->GetChunkCount() ; ++ i) {
       for ( int j = 0 ; j < pSfr->GetLoopCount( i) ; ++ j) {
          PolyLine PL ;
-         if ( ! pSfr->ApproxLoopWithLines( i, j, LIN_TOL_STD, ANG_TOL_STD_DEG, ICurve::APL_STD, PL)) {
+         if ( ! pSfr->ApproxLoopWithLines( i, j, dMyLinTol, ANG_TOL_STD_DEG, ICurve::APL_STD, PL)) {
             vPL.clear() ;
             return false ;
          }
diff --git a/SurfTriMesh.h b/SurfTriMesh.h
index 44b1fa2..f052390 100644
--- a/SurfTriMesh.h
+++ b/SurfTriMesh.h
@@ -16,6 +16,7 @@
 #include "ObjGraphicsMgr.h"
 #include "DllMain.h"
 #include "GeoObjRW.h"
+#include "GeoConst.h"
 #include "/EgtDev/Include/EGkSurfTriMesh.h"
 #include "/EgtDev/Include/EGkHashGrids3d.h"
 #include "/EgtDev/Include/EGkPointGrid3d.h"
@@ -295,8 +296,8 @@ class SurfTriMesh : public ISurfTriMesh, public IGeoObjRW
       bool GetTriangleSmoothNormals( int nId, TriNormals3d& TNrms) const override ;
       SurfTriMesh* CloneTriangle( int nT) const override ;
       bool GetLoops( POLYLINEVECTOR& vPL) const override ;
-      bool GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR& vPL, bool bAllTria = false) const override ;
-      bool GetSilhouette( const Plane3d& plPlane, double dTol, POLYLINEVECTOR& vPL, bool bAllTria = false) const override ;
+      bool GetSilhouette( const Vector3d& vtDir, double dTol, POLYLINEVECTOR& vPL, bool bAllTria = false, double dLinTol = LIN_TOL_STD) const override ;
+      bool GetSilhouette( const Plane3d& plPlane, double dTol, POLYLINEVECTOR& vPL, bool bAllTria = false, double dLinTol = LIN_TOL_STD) const override ;
       int  GetFacetCount( void) const override ;
       int  GetFacetSize( void) const override
               { return int( m_vFacet.size()) ; }