diff --git a/Operation.cpp b/Operation.cpp
index 3a4e10e..c3848ab 100644
--- a/Operation.cpp
+++ b/Operation.cpp
@@ -652,8 +652,12 @@ Operation::GetDistanceFromRawSide( int nPhase, const Point3d& ptP, const Vector3
    IntersCurveCurve intCC( *pRay, *pOut) ;
    int  nInters = intCC.GetIntersCount() ;
    IntCrvCrvInfo aInfo ;
-   if ( nInters > 0  &&  intCC.GetIntCrvCrvInfo( nInters - 1, aInfo))
-      dDist = aInfo.IciA[0].dU * RAY_LEN - EXTRA_LEN ;
+   if ( nInters > 0  &&  intCC.GetIntCrvCrvInfo( nInters - 1, aInfo)) {
+      if ( ! aInfo.bOverlap)
+         dDist = aInfo.IciA[0].dU * RAY_LEN - EXTRA_LEN ;
+      else
+         dDist = aInfo.IciA[1].dU * RAY_LEN - EXTRA_LEN ;
+   }
    else
       dDist = 0 ;
    return true ;