diff --git a/EgtGraphics.rc b/EgtGraphics.rc
index 466f662..e561f87 100644
Binary files a/EgtGraphics.rc and b/EgtGraphics.rc differ
diff --git a/SceneSnap.cpp b/SceneSnap.cpp
index 8e90280..c6bee61 100644
--- a/SceneSnap.cpp
+++ b/SceneSnap.cpp
@@ -588,7 +588,7 @@ Scene::FindSurfTMSnapPoint( int nSnap, const Point3d& ptWin, int nId, const Fram
 
   // cerco i triangoli intersecati dalla linea di mira
    ILSIVECTOR vInfo ;
-   if ( ! IntersLineSurfTm( ptMir, vtDir, dLenMir, *pStm, vInfo))
+   if ( ! IntersLineSurfTm( ptMir, vtDir, dLenMir, *pStm, vInfo)  ||  vInfo.size() == 0)
       return false ;
 
   // elaborazione a seconda del tipo di snap