diff --git a/SurfTriMesh.cpp b/SurfTriMesh.cpp
index 12a7bac..9075f16 100644
--- a/SurfTriMesh.cpp
+++ b/SurfTriMesh.cpp
@@ -1048,10 +1048,16 @@ bool
 SurfTriMesh::MarchAlongLoop( int nT, int nV, int nTimeStamp, PolyLine& PL) const
 {
   // mi muovo lungo il loop, un triangolo alla volta
+   int nCount = 0 ;
    bool bEnd = false ;
    while ( ! bEnd) {
+     // altro triangolo
       if ( ! MarchOneTria( nT, nV, nTimeStamp, PL, bEnd))
          return false ;
+     // per evitare loop infiniti
+      ++ nCount ;
+      if ( nCount > 3 * int( m_vTria.size()) + 10)
+         return true ;
    }
    return true ;
 }
diff --git a/SurfTriMeshCuts.cpp b/SurfTriMeshCuts.cpp
index 7e8991c..cba5664 100644
--- a/SurfTriMeshCuts.cpp
+++ b/SurfTriMeshCuts.cpp
@@ -79,7 +79,7 @@ SurfTriMesh::CutByTriangles( const Plane3d& plPlane, bool bSaveOnEq, bool& bModi
       if ( m_vVert[i].nIdTria == SVT_DEL)
          continue ;
       double dDist = DistPointPlane( m_vVert[i].ptP, plPlane) ;
-      if ( abs( dDist) < EPS_SMALL)
+      if ( abs( dDist) < 1.1 * EPS_SMALL)
          m_vVert[i].nTemp = 0 ;
       else if ( dDist > 0)
          m_vVert[i].nTemp = +1 ;