diff --git a/EgtGeomKernel.rc b/EgtGeomKernel.rc
index 8d88e04..e0f7eb1 100644
Binary files a/EgtGeomKernel.rc and b/EgtGeomKernel.rc differ
diff --git a/SurfTriMesh.cpp b/SurfTriMesh.cpp
index 3e2ff1f..b82a7c2 100644
--- a/SurfTriMesh.cpp
+++ b/SurfTriMesh.cpp
@@ -3195,11 +3195,13 @@ SurfTriMesh::Cut( const Plane3d& plPlane, bool bSaveOnEq)
       return false ;
 
   // classifico i vertici rispetto al piano
+   double dTol = max( min( 0.5 * m_dLinTol, 10 * EPS_SMALL), EPS_SMALL) ;
    for ( int i = 0 ; i < GetVertexSize() ; ++ i) {
       double dDist = DistPointPlane( m_vVert[i].ptP, plPlane) ;
-      if ( abs( dDist) < m_dLinTol) {
+      if ( abs( dDist) < dTol) {
          m_vVert[i].nTemp = 0 ;
-         m_vVert[i].ptP -= plPlane.GetVersN() * dDist ;
+         if ( abs( dDist) > EPS_SMALL)
+            m_vVert[i].ptP -= plPlane.GetVersN() * dDist ;
       }
       else if ( dDist > 0)
          m_vVert[i].nTemp = +1 ;
diff --git a/SurfTriMeshFaceting.cpp b/SurfTriMeshFaceting.cpp
index b6040e2..dc02e19 100644
--- a/SurfTriMeshFaceting.cpp
+++ b/SurfTriMeshFaceting.cpp
@@ -114,7 +114,8 @@ SurfTriMesh::UpdateTriaFaceting( int nRefT, int nFacet, const Plane3d& plPlane,
    }
    if ( nV == SVT_NULL)
       return false ;
-   if ( ! PointInPlaneApprox( m_vVert[m_vTria[nT].nIdVert[nV]].ptP, plPlane))
+   double dTol = max( min( m_dLinTol, 20 * EPS_SMALL), 2 * EPS_SMALL) ;
+   if ( ! PointInPlaneEpsilon( m_vVert[m_vTria[nT].nIdVert[nV]].ptP, plPlane, dTol))
       return true ;
   // il triangolo fa parte della faccia
    m_vTria[nT].nIdFacet = nFacet ;