Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/Routines2D.cs
===================================================================
diff -u -r3079 -r3091
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/Routines2D.cs	(.../Routines2D.cs)	(revision 3079)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/Routines2D.cs	(.../Routines2D.cs)	(revision 3091)
@@ -227,6 +227,25 @@
             {
                 return Clockwise.NotEnoughUniquePoints;
             }
+            var p0 = distinctPoints.First();
+            Point2D[] realDistinctPoint = new Point2D[distinctPoints.Length];
+            realDistinctPoint[0] = p0;
+            var index = 1;
+            foreach (var distinctPoint in distinctPoints)
+            {
+                if (distinctPoint != p0)
+                {
+                    if (!distinctPoint.LocationEquals(p0))
+                    {
+                        realDistinctPoint[index] = distinctPoint;
+                        index++;
+                    }
+                }
+            }
+            if (index < 3)
+            {
+                return Clockwise.NotEnoughUniquePoints;
+            }
 
             double sumClockwise = 0;
             double clockwise;