diff --git a/Vector3d.cpp b/Vector3d.cpp
index 55ea880..c50a26b 100644
--- a/Vector3d.cpp
+++ b/Vector3d.cpp
@@ -483,6 +483,9 @@ Vector3d::GetRotation( const Vector3d& vtEnd, const Vector3d& vtAx, double& dAng
       return true ;
    }
   // altrimenti angolo impossibile
-   else
+   else {
+      dAngDeg = 0 ;
+      bDet = false ;
       return false ;
+   }
 }