diff --git a/EXE_GeoInters.cpp b/EXE_GeoInters.cpp
index 2ac6a3f..46778c3 100644
--- a/EXE_GeoInters.cpp
+++ b/EXE_GeoInters.cpp
@@ -454,7 +454,8 @@ MyPlaneSurfTmInters( const Point3d& ptOn, const Vector3d& vtN, int nId, int nDes
          Point3d ptStart = ( bAdded ? vBpt[nInd].first : ptNear) ;
          Point3d ptEnd = vBpt[nInd].second ;
         // provo ad accodarlo alla composita
-         bAdded = ( pLine->Set( ptStart, ptEnd)  &&
+         bAdded = ( Dist( ptStart, ptEnd) > dToler / 2  &&
+                    pLine->Set( ptStart, ptEnd)  &&
                     pCrvCompo->AddCurve( Release( pLine), true, dToler)) ;
          ptNear = ( bAdded ? ptEnd : ptStart) ;
       }
@@ -589,7 +590,8 @@ MyChainCurvesForSurfSurfInters( const BIPNTVECTOR& vBpt, IGeomDB* pGeomDB, int n
          Point3d ptStart = ( bAdded ? vBpt[nInd].first : ptNear) ;
          Point3d ptEnd = vBpt[nInd].second ;
         // provo ad accodarlo alla composita
-         bAdded = ( pLine->Set( ptStart, ptEnd)  &&
+         bAdded = ( Dist( ptStart, ptEnd) > dToler / 2  &&
+                    pLine->Set( ptStart, ptEnd)  &&
                     pCrvCompo->AddCurve( Release( pLine), true, dToler)) ;
          ptNear = ( bAdded ? ptEnd : ptStart) ;
       }